SlideShare a Scribd company logo
UNIT 5 Final CN - unit 5 notes important questions
Computer Networks (Dr. A.P.J. Abdul Kalam Technical University)
Scan to open on Studocu
Studocu is not sponsored or endorsed by any college or university
UNIT 5 Final CN - unit 5 notes important questions
Computer Networks (Dr. A.P.J. Abdul Kalam Technical University)
Scan to open on Studocu
Studocu is not sponsored or endorsed by any college or university
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
COMPUTER SCIENCE ENGINEERING
MCA/ BCA/ Polytechnic CS/ B.Sc. IT/CS
Dr. A.P.J. Abdul Kalam Technical University
SUBJECT
UNIT 5- MOST EXPECTED
B.TECH
COMPUTER SCIENCE ENGINEERING
MCA/ BCA/ Polytechnic CS/ B.Sc. IT/CS
(AKTU, Lucknow)
Dr. A.P.J. Abdul Kalam Technical University, Uttar Pradesh
SUBJECT – Computer Network
MOST EXPECTED QUESTIONS AND ANSWERS
By Vishal Dhiman
MCA/ BCA/ Polytechnic CS/ B.Sc. IT/CS
Uttar Pradesh
Computer Network
QUESTIONS AND ANSWERS
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.1. Write a short note on file transfer protocol.
AKTU 2013-14, Marks 2.5
AKTU 2015-16, 2017-18; Marks 05
Answer
1. FTP transmits the files from one host to another host .
2. FTP (File Transfer Protocol) is the simplest and most secure way to exchange files
over the internet. The most common use for FTP is to download files from the
internet.
3. FTP creates both a control and a data connection in order to transfer files.
4. Within an active FTP session, the control connection is established from the client
to the server, with the data connection established from the server to the client.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.2. How does FTP work? Differentiate between passive and active FTP.
AKTU 2016-17, Marks 10
Answer
Working of FTP:
1. The client FTP application opens a control connection to the server on destination
port 21, and specifies a source port as the source to which the FTP server should
respond (using TCP).
2. The FTP server responds on port 21.
3. The FTP server and client negotiate the data transfer parameters.
4. The FTP server opens a second connection on port 20 to the
original client.
5. The client responds on the data port, completing a TCP connection
6. Data transfer begins.
7. The server indicates the end of the data transfer.
8. Client closes the connection once the data is received.
9. The data connection is closed.
10. The FTP connection is closed.
Control
Connection
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Difference between passive and active FTP:
S.No. Passive FTP Active FTP
1. Passive FTP does not provide security
to the FTP server.
Active FTP provides more security to
the FTP server.
2. Passive FTP does not have connection
issues from firewalls.
Active FTP may cause problems
because of firewalls
3. In passive FTP, the command channel
and the data channel are established
by the client.
In active FTP, client establishes the
command channel and the server
establishes the data channel
4. Passive mode is used as a default
mode of a browser.
Active mode is not used as a default
mode of a browser.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Command and
control port
Data Port
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.3. Write a short note on:
i. MIME
ii. TFTP
AKTU 2013-14, Marks 05
Answer
MIME:
1. The Multipurpose Internet Mail Extension (MIME) protocol was developed to
define a method of moving multimedia files through existing email gateways.
2. It offers a simple standardized way to represent and encode a wide variety of
media types, including audio and video for transmission via internet mail.
3. MIME, use to overcome from SMTP Limitations
SMTP – no audio , no video , no big size of data
TFTP:
1. The TFTP stand for Trivial File Transfer Protocol.
2. Mainly use for transfer files within a Local area network.
3. It makes UDP (User Datagram Protocol) connections.
4. Not use to transfer the files over the internet (through LAN Cable).
5. Its default port number is 69.
6. It is connectionless and speed fast.
7. It is not secure and It has no acknowledgement policy.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.4. Write a short note on DNS in the internet.
AKTU 2013-14, 2015-16, 2017-18; Marks 05
Answer
1. DNS Stands for “Domain Name System or Service”.
2. It is an automatic process that converts the Domain name to its corresponding IP
address (Number).
3. So That web browser can understand which web page you want to access on the
internet.
4. Example – Mobile Contact
www.ABC .com
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.5. Explain about email architecture and services.
AKTU 2013-14, Marks 10
OR
Write a short note on electronic mail.
AKTU 2015-16, Marks 05
Answer
1. E-mail stands for Electronic mail.
2. E-mail is a private communication between two parties who have an account on
the internet.
3. It is an electronic message sent from the computer to another Computer.
4. Email messages are conveyed through email servers, It uses multiple protocols
within the TCP/IP.
5. For Example – SMTP, POP.
Structure of Email message.
Emails consist of two main parts :
1. Header : Header contains the name and address of the recipient.
2. Body of message. : Body contains the message itself.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Email address:
To send and receive mails, One need to have an e-mail address.
E-mail addresses consists of two parts:
1. User name – it is the name of a person’s account, which can be a actual name or
any name
2. Domain name: It is the location of the person’s account on the internet separated
by a (.) and then type of organization is mentioned.
3. For Example
User name @ Domain name
Here two parts are separated by “At” or @ symbol.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.6. Elaborate about Telnet and its working procedure.
Answer
1. TELNET Stands for Tele Communication Network
2. This Protocol belongs to TCP/IP
3. It is used for remotely login into another remot
with any remote computer we have to login by using our user id and password
directly
4. For this purpose we use TELNET Protocol.
5. For Example : FACEBOOK LOGIN, INSTAGRAM and Other types of logins.
Elaborate about Telnet and its working procedure.
AKTU 2016-17, 2017
TELNET Stands for Tele Communication Network
Protocol belongs to TCP/IP
It is used for remotely login into another remote computer. That means to work
with any remote computer we have to login by using our user id and password
this purpose we use TELNET Protocol.
For Example : FACEBOOK LOGIN, INSTAGRAM and Other types of logins.
17, 2017-18; Marks 10
means to work
with any remote computer we have to login by using our user id and password
For Example : FACEBOOK LOGIN, INSTAGRAM and Other types of logins.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Working procedure:
1. Telnet uses software, installed on our computer, to create a connection with the
remote host.
2. The Telnet client (software), will send a request to the Telnet server (remote host)
when command is given.
3. The server will reply asking for a username and password.
4. If accepted, the Telnet client will establish a connection to the host, thus making
our computer a virtual terminal and provide a complete access to the host's
computer.
5. Telnet requires the use of a username and password, which means we need to
have previously set up an account on the remote computer.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.7. Explain the two mail access protocols in brief:
a. POP3
b. IMAP
c. SMTP
Answer
a. POP3:
1. POP3 Stands for POST OFFICE PROTOCOL VERSION 3.
2. SMTP holds the mail if destination computer is offline.
server using POP3 to fetch it.
. Explain the two mail access protocols in brief:
AKTU 2013
FFICE PROTOCOL VERSION 3.
SMTP holds the mail if destination computer is offline. Client internet with mail
server using POP3 to fetch it.
AKTU 2013-14, Marks 10
Client internet with mail
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
b. IMAP (Internet Message Access Protocol)
1. IMAP was designed as a superset of POP3 and enhances both message retrieval
and management.
2. IMAP protocol will not automatically download all emails, each time email
program connects to email server.
3. The IMAP protocol allows us to see through em
before we download them
4. With IMAP we can choose to download our messages or just delete
them.
IMAP (Internet Message Access Protocol) :
IMAP was designed as a superset of POP3 and enhances both message retrieval
IMAP protocol will not automatically download all emails, each time email
program connects to email server.
The IMAP protocol allows us to see through email messages at the email server
before we download them
With IMAP we can choose to download our messages or just delete
IMAP was designed as a superset of POP3 and enhances both message retrieval
IMAP protocol will not automatically download all emails, each time email
ail messages at the email server
With IMAP we can choose to download our messages or just delete
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
c. SMTP (Simple Mail Transfer Protocol) :
1. The main function of text based SMTP protocol is to send emails.
2. It is used for sending message to a mail server for relaying.
3. It uses TCP (Transmission Control Protocol) to transfer message from client to
server.
4. SMTP uses port 25 for message transmission.
5. SMTP messages are read by humans. These messages are first stored and then
forwarded.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.8. Explain the SMTP can handle transfer of videos and images? Also explain the
advantages of IMAP4 over POP3 mail access protocols.
AKTU 2014-15, Marks 10
Answer:
SMTP cannot handle transfer of videos and images.
Advantages of IMAP4 over POP3:
1. In IMAP4, we can access our email from anywhere but in POP3 it is not possible.
2. In IMAP4 multiple users can connect to single mail box but POP3 can connect only
single user to mail box.
3. In IMAP4 an email does not need to be deleted multiple times, which can be a
problem in POP3.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.9. Write a short note on SNMP.
AKTU 2015-16, Marks 05
OR
Explain the SNMP protocols in detail.
AKTU 2016-17, Marks 15
AKTU 2017-18, Marks 10
Answer
1. The Simple Network Management Protocol (SNMP) is a framework for managing
devices in an internet using the TCP/IP protocol suite.
2. It provides a set of fundamental operations for monitoring and maintaining an
internet. SNMP uses the concept of manager and agent.
3. A manager is a host that controls and monitors a set of agents, usually routers.
4. The protocol is designed at the application level so that it can monitor devices
made by different manufacturers and installed on different physical networks.
5. SNMP frees management tasks from both the physical characteristics of the
managed devices and the underlying networking technology.
6. It can be used in a heterogeneous internet made of different LANs and WANs
connected by routers or gateways made by different manufacturers.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.11. What is the difference between an active web document and dynamic web
page? Also explain the role of CGI.
AKTU 2014-15, Marks 10
Answer
Active web document
An active web document is a document where the browser performs the logic instead
of the server.
Active web document are downloaded in client environment and then run.
It uses PHP as scripting language.
Dynamic web page
Dynamic web page is a page where server performs the logic instead of the browser.
Dynamic web page runs on the server and then the result is sent to the user.
It uses AJAX with JavaScript.
Role of CGI:
1. It helps to create and handle dynamic document.
2. It provides sets of standards for web document.
3. It acts as a gateway for accessing other resources such as database.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.12. Compare and contrast SMTP and HTTP.
Answer
S.no. SMTP HTTP
1. Message is transferred from client to
server.
Message transfer is from client to
server or the other way round
2. It uses TCP. It uses TCP.
3. It uses port 25 for transmission. It uses port 80 for transmission.
4. SMTP messages are to be read by
humans.
HTTP messages are to be read and
understood by the HTTP servers and
HTTP clients
5. These messages are first stored and
then forwarded
These messages are immediately
delivered
.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.13. Describe internet.
Answer
Internet:
1. The internet is a globally existing network of networks consisting of a huge
number of computers located in all the parts of the world.
2. All the computers connected to the internet are part of this huge network.
3. Networking is interconnection of computers. Generally the networking topologies
used for networking are star, bus, ring, etc.
4. When a limited number of computers are to be interconnected, the local area
network (LAN) is used. But in the internet the interconnection is achieved even via
satellites.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556
Que 1.14. Differentiate between X.25 and frame relay.
Answer
S.No. X.25 frame relay
1. X.25 networks work at speed up to
64 kbps.
Frame relay operates at higher speed of
1.5 Mbps.
2. Frames are delivered more reliably
than frame relay.
Frames are delivered unreliably than
X.25.
3. Frames are delivered in order. Frames are not delivered in order.
4. Bad frames can be received back by
sending acknowledgement signal.
Bad frames are discarded by frame
relay
5. X.25 provides flow control. Frame relay does not provide flow
control.
Downloaded by somya singh (radheeshyam1176@gmail.com)
lOMoARcPSD|39396556

More Related Content

Similar to unit-5-final-cn-unit-5-notes-important-questions.pdf

retrieving the mail
retrieving the mailretrieving the mail
retrieving the mail
tumetr1
 
Internet Protocol
Internet ProtocolInternet Protocol
Internet Protocol
AvikGhara
 
Design an Implementation of A Messaging and Resource Sharing Software
Design an Implementation of A Messaging and Resource Sharing SoftwareDesign an Implementation of A Messaging and Resource Sharing Software
Design an Implementation of A Messaging and Resource Sharing Software
nilabarai
 
Windows 2012 server
Windows 2012 serverWindows 2012 server
Windows 2012 server
Jaffer Haadi
 
Network Protocols KS4
Network Protocols KS4Network Protocols KS4
Network Protocols KS4
Melanie Knight
 
Internet technology unit 6
Internet technology unit 6Internet technology unit 6
Internet technology unit 6
WE-IT TUTORIALS
 
Smtp, pop3, imapv 4
Smtp, pop3, imapv 4Smtp, pop3, imapv 4
Smtp, pop3, imapv 4
Shwetanshu Gupta
 
Unit 3 - Protocols and Client-Server Applications - IT
Unit 3 - Protocols and Client-Server Applications - ITUnit 3 - Protocols and Client-Server Applications - IT
Unit 3 - Protocols and Client-Server Applications - IT
Deepraj Bhujel
 
vishal_sharma: python email sending software
vishal_sharma: python email sending software  vishal_sharma: python email sending software
vishal_sharma: python email sending software
vishal sharma
 
Simple Mail Transfer Protocol
Simple Mail Transfer ProtocolSimple Mail Transfer Protocol
Simple Mail Transfer Protocol
Ujjayanta Bhaumik
 
Networking in python by Rj
Networking in python by RjNetworking in python by Rj
Chapter 10 : Application layer
Chapter 10 : Application layerChapter 10 : Application layer
Chapter 10 : Application layer
teknetir
 
CCNAv5 - S1: Chapter 10 Application Layer
CCNAv5 - S1: Chapter 10 Application LayerCCNAv5 - S1: Chapter 10 Application Layer
CCNAv5 - S1: Chapter 10 Application Layer
Vuz Dở Hơi
 
Chapter 10 - Application Layer
Chapter 10 - Application LayerChapter 10 - Application Layer
Chapter 10 - Application Layer
Yaser Rahmati
 
Final networks lab manual
Final networks lab manualFinal networks lab manual
Final networks lab manual
Jaya Prasanna
 
NY Web Perf Meetup: Peeling the Web Performance Onion
NY Web Perf Meetup: Peeling the Web Performance OnionNY Web Perf Meetup: Peeling the Web Performance Onion
NY Web Perf Meetup: Peeling the Web Performance Onion
Catchpoint Systems
 
Dcn ppt 150050705008
Dcn ppt 150050705008Dcn ppt 150050705008
Dcn ppt 150050705008
Jaydeep Thakor
 
How does the internet work converted General (Your) Affiliate Link: https://w...
How does the internet work converted General (Your) Affiliate Link: https://w...How does the internet work converted General (Your) Affiliate Link: https://w...
How does the internet work converted General (Your) Affiliate Link: https://w...
YonasBayu1
 
SMTP and TCP protocol
SMTP and TCP protocolSMTP and TCP protocol
SMTP and TCP protocol
DivyaKS18
 
Pears
PearsPears
Pears
thips
 

Similar to unit-5-final-cn-unit-5-notes-important-questions.pdf (20)

retrieving the mail
retrieving the mailretrieving the mail
retrieving the mail
 
Internet Protocol
Internet ProtocolInternet Protocol
Internet Protocol
 
Design an Implementation of A Messaging and Resource Sharing Software
Design an Implementation of A Messaging and Resource Sharing SoftwareDesign an Implementation of A Messaging and Resource Sharing Software
Design an Implementation of A Messaging and Resource Sharing Software
 
Windows 2012 server
Windows 2012 serverWindows 2012 server
Windows 2012 server
 
Network Protocols KS4
Network Protocols KS4Network Protocols KS4
Network Protocols KS4
 
Internet technology unit 6
Internet technology unit 6Internet technology unit 6
Internet technology unit 6
 
Smtp, pop3, imapv 4
Smtp, pop3, imapv 4Smtp, pop3, imapv 4
Smtp, pop3, imapv 4
 
Unit 3 - Protocols and Client-Server Applications - IT
Unit 3 - Protocols and Client-Server Applications - ITUnit 3 - Protocols and Client-Server Applications - IT
Unit 3 - Protocols and Client-Server Applications - IT
 
vishal_sharma: python email sending software
vishal_sharma: python email sending software  vishal_sharma: python email sending software
vishal_sharma: python email sending software
 
Simple Mail Transfer Protocol
Simple Mail Transfer ProtocolSimple Mail Transfer Protocol
Simple Mail Transfer Protocol
 
Networking in python by Rj
Networking in python by RjNetworking in python by Rj
Networking in python by Rj
 
Chapter 10 : Application layer
Chapter 10 : Application layerChapter 10 : Application layer
Chapter 10 : Application layer
 
CCNAv5 - S1: Chapter 10 Application Layer
CCNAv5 - S1: Chapter 10 Application LayerCCNAv5 - S1: Chapter 10 Application Layer
CCNAv5 - S1: Chapter 10 Application Layer
 
Chapter 10 - Application Layer
Chapter 10 - Application LayerChapter 10 - Application Layer
Chapter 10 - Application Layer
 
Final networks lab manual
Final networks lab manualFinal networks lab manual
Final networks lab manual
 
NY Web Perf Meetup: Peeling the Web Performance Onion
NY Web Perf Meetup: Peeling the Web Performance OnionNY Web Perf Meetup: Peeling the Web Performance Onion
NY Web Perf Meetup: Peeling the Web Performance Onion
 
Dcn ppt 150050705008
Dcn ppt 150050705008Dcn ppt 150050705008
Dcn ppt 150050705008
 
How does the internet work converted General (Your) Affiliate Link: https://w...
How does the internet work converted General (Your) Affiliate Link: https://w...How does the internet work converted General (Your) Affiliate Link: https://w...
How does the internet work converted General (Your) Affiliate Link: https://w...
 
SMTP and TCP protocol
SMTP and TCP protocolSMTP and TCP protocol
SMTP and TCP protocol
 
Pears
PearsPears
Pears
 

Recently uploaded

官方认证美国旧金山州立大学毕业证学位证书案例原版一模一样
官方认证美国旧金山州立大学毕业证学位证书案例原版一模一样官方认证美国旧金山州立大学毕业证学位证书案例原版一模一样
官方认证美国旧金山州立大学毕业证学位证书案例原版一模一样
2zjra9bn
 
Connect to Grow: The power of building networks
Connect to Grow: The power of building networksConnect to Grow: The power of building networks
Connect to Grow: The power of building networks
Eirini SYKA-LERIOTI
 
体育博彩论坛-十大体育博彩论坛-体育博彩论坛|【​网址​🎉ac55.net🎉​】
体育博彩论坛-十大体育博彩论坛-体育博彩论坛|【​网址​🎉ac55.net🎉​】体育博彩论坛-十大体育博彩论坛-体育博彩论坛|【​网址​🎉ac55.net🎉​】
体育博彩论坛-十大体育博彩论坛-体育博彩论坛|【​网址​🎉ac55.net🎉​】
waldorfnorma258
 
Switching Careers Slides - JoyceMSullivan SocMediaFin - 2024Jun11.pdf
Switching Careers Slides - JoyceMSullivan SocMediaFin -  2024Jun11.pdfSwitching Careers Slides - JoyceMSullivan SocMediaFin -  2024Jun11.pdf
Switching Careers Slides - JoyceMSullivan SocMediaFin - 2024Jun11.pdf
SocMediaFin - Joyce Sullivan
 
Gabrielle M. A. Sinaga Portfolio, Film Student (2024)
Gabrielle M. A. Sinaga Portfolio, Film Student (2024)Gabrielle M. A. Sinaga Portfolio, Film Student (2024)
Gabrielle M. A. Sinaga Portfolio, Film Student (2024)
GabrielleSinaga
 
Leadership Ambassador club Adventist module
Leadership Ambassador club Adventist moduleLeadership Ambassador club Adventist module
Leadership Ambassador club Adventist module
kakomaeric00
 
BUKU PENJAGAAN BUKU PENJAGAAN BUKU PENJAGAAN
BUKU PENJAGAAN BUKU PENJAGAAN BUKU PENJAGAANBUKU PENJAGAAN BUKU PENJAGAAN BUKU PENJAGAAN
BUKU PENJAGAAN BUKU PENJAGAAN BUKU PENJAGAAN
cahgading001
 
一比一原版美国西北大学毕业证(NWU毕业证书)学历如何办理
一比一原版美国西北大学毕业证(NWU毕业证书)学历如何办理一比一原版美国西北大学毕业证(NWU毕业证书)学历如何办理
一比一原版美国西北大学毕业证(NWU毕业证书)学历如何办理
1wful2fm
 
All Of My Java Codes With A Sample Output.docx
All Of My Java Codes With A Sample Output.docxAll Of My Java Codes With A Sample Output.docx
All Of My Java Codes With A Sample Output.docx
adhitya5119
 
办理阿卡迪亚大学毕业证(uvic毕业证)本科文凭证书原版一模一样
办理阿卡迪亚大学毕业证(uvic毕业证)本科文凭证书原版一模一样办理阿卡迪亚大学毕业证(uvic毕业证)本科文凭证书原版一模一样
办理阿卡迪亚大学毕业证(uvic毕业证)本科文凭证书原版一模一样
kkkkr4pg
 
Learnings from Successful Jobs Searchers
Learnings from Successful Jobs SearchersLearnings from Successful Jobs Searchers
Learnings from Successful Jobs Searchers
Bruce Bennett
 
Community Skills Building Workshop | PMI Silver Spring Chapter | June 12, 2024
Community Skills Building Workshop | PMI Silver Spring Chapter  | June 12, 2024Community Skills Building Workshop | PMI Silver Spring Chapter  | June 12, 2024
Community Skills Building Workshop | PMI Silver Spring Chapter | June 12, 2024
Hector Del Castillo, CPM, CPMM
 
在线制作加拿大萨省大学毕业证文凭证书实拍图原版一模一样
在线制作加拿大萨省大学毕业证文凭证书实拍图原版一模一样在线制作加拿大萨省大学毕业证文凭证书实拍图原版一模一样
在线制作加拿大萨省大学毕业证文凭证书实拍图原版一模一样
2zjra9bn
 
在线办理(UOIT毕业证书)安大略省理工大学毕业证在读证明一模一样
在线办理(UOIT毕业证书)安大略省理工大学毕业证在读证明一模一样在线办理(UOIT毕业证书)安大略省理工大学毕业证在读证明一模一样
在线办理(UOIT毕业证书)安大略省理工大学毕业证在读证明一模一样
yhkox
 
按照学校原版(UofT文凭证书)多伦多大学毕业证快速办理
按照学校原版(UofT文凭证书)多伦多大学毕业证快速办理按照学校原版(UofT文凭证书)多伦多大学毕业证快速办理
按照学校原版(UofT文凭证书)多伦多大学毕业证快速办理
evnum
 
Leave-rules.ppt CCS leave rules 1972 for central govt employees
Leave-rules.ppt CCS leave rules 1972 for central govt employeesLeave-rules.ppt CCS leave rules 1972 for central govt employees
Leave-rules.ppt CCS leave rules 1972 for central govt employees
Sreenivas702647
 
How to overcome obstacles in the way of success.pdf
How to overcome obstacles in the way of success.pdfHow to overcome obstacles in the way of success.pdf
How to overcome obstacles in the way of success.pdf
Million-$-Knowledge {Million Dollar Knowledge}
 
Lbs last rank 2023 9988kr47h4744j445.pdf
Lbs last rank 2023 9988kr47h4744j445.pdfLbs last rank 2023 9988kr47h4744j445.pdf
Lbs last rank 2023 9988kr47h4744j445.pdf
ashiquepa3
 
thyroid case presentation.pptx Kamala's Lakshaman palatial
thyroid case presentation.pptx Kamala's Lakshaman palatialthyroid case presentation.pptx Kamala's Lakshaman palatial
thyroid case presentation.pptx Kamala's Lakshaman palatial
Aditya Raghav
 
A Guide to a Winning Interview June 2024
A Guide to a Winning Interview June 2024A Guide to a Winning Interview June 2024
A Guide to a Winning Interview June 2024
Bruce Bennett
 

Recently uploaded (20)

官方认证美国旧金山州立大学毕业证学位证书案例原版一模一样
官方认证美国旧金山州立大学毕业证学位证书案例原版一模一样官方认证美国旧金山州立大学毕业证学位证书案例原版一模一样
官方认证美国旧金山州立大学毕业证学位证书案例原版一模一样
 
Connect to Grow: The power of building networks
Connect to Grow: The power of building networksConnect to Grow: The power of building networks
Connect to Grow: The power of building networks
 
体育博彩论坛-十大体育博彩论坛-体育博彩论坛|【​网址​🎉ac55.net🎉​】
体育博彩论坛-十大体育博彩论坛-体育博彩论坛|【​网址​🎉ac55.net🎉​】体育博彩论坛-十大体育博彩论坛-体育博彩论坛|【​网址​🎉ac55.net🎉​】
体育博彩论坛-十大体育博彩论坛-体育博彩论坛|【​网址​🎉ac55.net🎉​】
 
Switching Careers Slides - JoyceMSullivan SocMediaFin - 2024Jun11.pdf
Switching Careers Slides - JoyceMSullivan SocMediaFin -  2024Jun11.pdfSwitching Careers Slides - JoyceMSullivan SocMediaFin -  2024Jun11.pdf
Switching Careers Slides - JoyceMSullivan SocMediaFin - 2024Jun11.pdf
 
Gabrielle M. A. Sinaga Portfolio, Film Student (2024)
Gabrielle M. A. Sinaga Portfolio, Film Student (2024)Gabrielle M. A. Sinaga Portfolio, Film Student (2024)
Gabrielle M. A. Sinaga Portfolio, Film Student (2024)
 
Leadership Ambassador club Adventist module
Leadership Ambassador club Adventist moduleLeadership Ambassador club Adventist module
Leadership Ambassador club Adventist module
 
BUKU PENJAGAAN BUKU PENJAGAAN BUKU PENJAGAAN
BUKU PENJAGAAN BUKU PENJAGAAN BUKU PENJAGAANBUKU PENJAGAAN BUKU PENJAGAAN BUKU PENJAGAAN
BUKU PENJAGAAN BUKU PENJAGAAN BUKU PENJAGAAN
 
一比一原版美国西北大学毕业证(NWU毕业证书)学历如何办理
一比一原版美国西北大学毕业证(NWU毕业证书)学历如何办理一比一原版美国西北大学毕业证(NWU毕业证书)学历如何办理
一比一原版美国西北大学毕业证(NWU毕业证书)学历如何办理
 
All Of My Java Codes With A Sample Output.docx
All Of My Java Codes With A Sample Output.docxAll Of My Java Codes With A Sample Output.docx
All Of My Java Codes With A Sample Output.docx
 
办理阿卡迪亚大学毕业证(uvic毕业证)本科文凭证书原版一模一样
办理阿卡迪亚大学毕业证(uvic毕业证)本科文凭证书原版一模一样办理阿卡迪亚大学毕业证(uvic毕业证)本科文凭证书原版一模一样
办理阿卡迪亚大学毕业证(uvic毕业证)本科文凭证书原版一模一样
 
Learnings from Successful Jobs Searchers
Learnings from Successful Jobs SearchersLearnings from Successful Jobs Searchers
Learnings from Successful Jobs Searchers
 
Community Skills Building Workshop | PMI Silver Spring Chapter | June 12, 2024
Community Skills Building Workshop | PMI Silver Spring Chapter  | June 12, 2024Community Skills Building Workshop | PMI Silver Spring Chapter  | June 12, 2024
Community Skills Building Workshop | PMI Silver Spring Chapter | June 12, 2024
 
在线制作加拿大萨省大学毕业证文凭证书实拍图原版一模一样
在线制作加拿大萨省大学毕业证文凭证书实拍图原版一模一样在线制作加拿大萨省大学毕业证文凭证书实拍图原版一模一样
在线制作加拿大萨省大学毕业证文凭证书实拍图原版一模一样
 
在线办理(UOIT毕业证书)安大略省理工大学毕业证在读证明一模一样
在线办理(UOIT毕业证书)安大略省理工大学毕业证在读证明一模一样在线办理(UOIT毕业证书)安大略省理工大学毕业证在读证明一模一样
在线办理(UOIT毕业证书)安大略省理工大学毕业证在读证明一模一样
 
按照学校原版(UofT文凭证书)多伦多大学毕业证快速办理
按照学校原版(UofT文凭证书)多伦多大学毕业证快速办理按照学校原版(UofT文凭证书)多伦多大学毕业证快速办理
按照学校原版(UofT文凭证书)多伦多大学毕业证快速办理
 
Leave-rules.ppt CCS leave rules 1972 for central govt employees
Leave-rules.ppt CCS leave rules 1972 for central govt employeesLeave-rules.ppt CCS leave rules 1972 for central govt employees
Leave-rules.ppt CCS leave rules 1972 for central govt employees
 
How to overcome obstacles in the way of success.pdf
How to overcome obstacles in the way of success.pdfHow to overcome obstacles in the way of success.pdf
How to overcome obstacles in the way of success.pdf
 
Lbs last rank 2023 9988kr47h4744j445.pdf
Lbs last rank 2023 9988kr47h4744j445.pdfLbs last rank 2023 9988kr47h4744j445.pdf
Lbs last rank 2023 9988kr47h4744j445.pdf
 
thyroid case presentation.pptx Kamala's Lakshaman palatial
thyroid case presentation.pptx Kamala's Lakshaman palatialthyroid case presentation.pptx Kamala's Lakshaman palatial
thyroid case presentation.pptx Kamala's Lakshaman palatial
 
A Guide to a Winning Interview June 2024
A Guide to a Winning Interview June 2024A Guide to a Winning Interview June 2024
A Guide to a Winning Interview June 2024
 

unit-5-final-cn-unit-5-notes-important-questions.pdf

  • 1. UNIT 5 Final CN - unit 5 notes important questions Computer Networks (Dr. A.P.J. Abdul Kalam Technical University) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university UNIT 5 Final CN - unit 5 notes important questions Computer Networks (Dr. A.P.J. Abdul Kalam Technical University) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 2. COMPUTER SCIENCE ENGINEERING MCA/ BCA/ Polytechnic CS/ B.Sc. IT/CS Dr. A.P.J. Abdul Kalam Technical University SUBJECT UNIT 5- MOST EXPECTED B.TECH COMPUTER SCIENCE ENGINEERING MCA/ BCA/ Polytechnic CS/ B.Sc. IT/CS (AKTU, Lucknow) Dr. A.P.J. Abdul Kalam Technical University, Uttar Pradesh SUBJECT – Computer Network MOST EXPECTED QUESTIONS AND ANSWERS By Vishal Dhiman MCA/ BCA/ Polytechnic CS/ B.Sc. IT/CS Uttar Pradesh Computer Network QUESTIONS AND ANSWERS Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 3. Que 1.1. Write a short note on file transfer protocol. AKTU 2013-14, Marks 2.5 AKTU 2015-16, 2017-18; Marks 05 Answer 1. FTP transmits the files from one host to another host . 2. FTP (File Transfer Protocol) is the simplest and most secure way to exchange files over the internet. The most common use for FTP is to download files from the internet. 3. FTP creates both a control and a data connection in order to transfer files. 4. Within an active FTP session, the control connection is established from the client to the server, with the data connection established from the server to the client. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 4. Que 1.2. How does FTP work? Differentiate between passive and active FTP. AKTU 2016-17, Marks 10 Answer Working of FTP: 1. The client FTP application opens a control connection to the server on destination port 21, and specifies a source port as the source to which the FTP server should respond (using TCP). 2. The FTP server responds on port 21. 3. The FTP server and client negotiate the data transfer parameters. 4. The FTP server opens a second connection on port 20 to the original client. 5. The client responds on the data port, completing a TCP connection 6. Data transfer begins. 7. The server indicates the end of the data transfer. 8. Client closes the connection once the data is received. 9. The data connection is closed. 10. The FTP connection is closed. Control Connection Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 5. Difference between passive and active FTP: S.No. Passive FTP Active FTP 1. Passive FTP does not provide security to the FTP server. Active FTP provides more security to the FTP server. 2. Passive FTP does not have connection issues from firewalls. Active FTP may cause problems because of firewalls 3. In passive FTP, the command channel and the data channel are established by the client. In active FTP, client establishes the command channel and the server establishes the data channel 4. Passive mode is used as a default mode of a browser. Active mode is not used as a default mode of a browser. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 6. Command and control port Data Port Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 7. Que 1.3. Write a short note on: i. MIME ii. TFTP AKTU 2013-14, Marks 05 Answer MIME: 1. The Multipurpose Internet Mail Extension (MIME) protocol was developed to define a method of moving multimedia files through existing email gateways. 2. It offers a simple standardized way to represent and encode a wide variety of media types, including audio and video for transmission via internet mail. 3. MIME, use to overcome from SMTP Limitations SMTP – no audio , no video , no big size of data TFTP: 1. The TFTP stand for Trivial File Transfer Protocol. 2. Mainly use for transfer files within a Local area network. 3. It makes UDP (User Datagram Protocol) connections. 4. Not use to transfer the files over the internet (through LAN Cable). 5. Its default port number is 69. 6. It is connectionless and speed fast. 7. It is not secure and It has no acknowledgement policy. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 8. Que 1.4. Write a short note on DNS in the internet. AKTU 2013-14, 2015-16, 2017-18; Marks 05 Answer 1. DNS Stands for “Domain Name System or Service”. 2. It is an automatic process that converts the Domain name to its corresponding IP address (Number). 3. So That web browser can understand which web page you want to access on the internet. 4. Example – Mobile Contact www.ABC .com Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 9. Que 1.5. Explain about email architecture and services. AKTU 2013-14, Marks 10 OR Write a short note on electronic mail. AKTU 2015-16, Marks 05 Answer 1. E-mail stands for Electronic mail. 2. E-mail is a private communication between two parties who have an account on the internet. 3. It is an electronic message sent from the computer to another Computer. 4. Email messages are conveyed through email servers, It uses multiple protocols within the TCP/IP. 5. For Example – SMTP, POP. Structure of Email message. Emails consist of two main parts : 1. Header : Header contains the name and address of the recipient. 2. Body of message. : Body contains the message itself. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 10. Email address: To send and receive mails, One need to have an e-mail address. E-mail addresses consists of two parts: 1. User name – it is the name of a person’s account, which can be a actual name or any name 2. Domain name: It is the location of the person’s account on the internet separated by a (.) and then type of organization is mentioned. 3. For Example User name @ Domain name Here two parts are separated by “At” or @ symbol. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 11. Que 1.6. Elaborate about Telnet and its working procedure. Answer 1. TELNET Stands for Tele Communication Network 2. This Protocol belongs to TCP/IP 3. It is used for remotely login into another remot with any remote computer we have to login by using our user id and password directly 4. For this purpose we use TELNET Protocol. 5. For Example : FACEBOOK LOGIN, INSTAGRAM and Other types of logins. Elaborate about Telnet and its working procedure. AKTU 2016-17, 2017 TELNET Stands for Tele Communication Network Protocol belongs to TCP/IP It is used for remotely login into another remote computer. That means to work with any remote computer we have to login by using our user id and password this purpose we use TELNET Protocol. For Example : FACEBOOK LOGIN, INSTAGRAM and Other types of logins. 17, 2017-18; Marks 10 means to work with any remote computer we have to login by using our user id and password For Example : FACEBOOK LOGIN, INSTAGRAM and Other types of logins. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 12. Working procedure: 1. Telnet uses software, installed on our computer, to create a connection with the remote host. 2. The Telnet client (software), will send a request to the Telnet server (remote host) when command is given. 3. The server will reply asking for a username and password. 4. If accepted, the Telnet client will establish a connection to the host, thus making our computer a virtual terminal and provide a complete access to the host's computer. 5. Telnet requires the use of a username and password, which means we need to have previously set up an account on the remote computer. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 13. Que 1.7. Explain the two mail access protocols in brief: a. POP3 b. IMAP c. SMTP Answer a. POP3: 1. POP3 Stands for POST OFFICE PROTOCOL VERSION 3. 2. SMTP holds the mail if destination computer is offline. server using POP3 to fetch it. . Explain the two mail access protocols in brief: AKTU 2013 FFICE PROTOCOL VERSION 3. SMTP holds the mail if destination computer is offline. Client internet with mail server using POP3 to fetch it. AKTU 2013-14, Marks 10 Client internet with mail Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 14. b. IMAP (Internet Message Access Protocol) 1. IMAP was designed as a superset of POP3 and enhances both message retrieval and management. 2. IMAP protocol will not automatically download all emails, each time email program connects to email server. 3. The IMAP protocol allows us to see through em before we download them 4. With IMAP we can choose to download our messages or just delete them. IMAP (Internet Message Access Protocol) : IMAP was designed as a superset of POP3 and enhances both message retrieval IMAP protocol will not automatically download all emails, each time email program connects to email server. The IMAP protocol allows us to see through email messages at the email server before we download them With IMAP we can choose to download our messages or just delete IMAP was designed as a superset of POP3 and enhances both message retrieval IMAP protocol will not automatically download all emails, each time email ail messages at the email server With IMAP we can choose to download our messages or just delete Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 15. c. SMTP (Simple Mail Transfer Protocol) : 1. The main function of text based SMTP protocol is to send emails. 2. It is used for sending message to a mail server for relaying. 3. It uses TCP (Transmission Control Protocol) to transfer message from client to server. 4. SMTP uses port 25 for message transmission. 5. SMTP messages are read by humans. These messages are first stored and then forwarded. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 16. Que 1.8. Explain the SMTP can handle transfer of videos and images? Also explain the advantages of IMAP4 over POP3 mail access protocols. AKTU 2014-15, Marks 10 Answer: SMTP cannot handle transfer of videos and images. Advantages of IMAP4 over POP3: 1. In IMAP4, we can access our email from anywhere but in POP3 it is not possible. 2. In IMAP4 multiple users can connect to single mail box but POP3 can connect only single user to mail box. 3. In IMAP4 an email does not need to be deleted multiple times, which can be a problem in POP3. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 17. Que 1.9. Write a short note on SNMP. AKTU 2015-16, Marks 05 OR Explain the SNMP protocols in detail. AKTU 2016-17, Marks 15 AKTU 2017-18, Marks 10 Answer 1. The Simple Network Management Protocol (SNMP) is a framework for managing devices in an internet using the TCP/IP protocol suite. 2. It provides a set of fundamental operations for monitoring and maintaining an internet. SNMP uses the concept of manager and agent. 3. A manager is a host that controls and monitors a set of agents, usually routers. 4. The protocol is designed at the application level so that it can monitor devices made by different manufacturers and installed on different physical networks. 5. SNMP frees management tasks from both the physical characteristics of the managed devices and the underlying networking technology. 6. It can be used in a heterogeneous internet made of different LANs and WANs connected by routers or gateways made by different manufacturers. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 18. Que 1.11. What is the difference between an active web document and dynamic web page? Also explain the role of CGI. AKTU 2014-15, Marks 10 Answer Active web document An active web document is a document where the browser performs the logic instead of the server. Active web document are downloaded in client environment and then run. It uses PHP as scripting language. Dynamic web page Dynamic web page is a page where server performs the logic instead of the browser. Dynamic web page runs on the server and then the result is sent to the user. It uses AJAX with JavaScript. Role of CGI: 1. It helps to create and handle dynamic document. 2. It provides sets of standards for web document. 3. It acts as a gateway for accessing other resources such as database. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 19. Que 1.12. Compare and contrast SMTP and HTTP. Answer S.no. SMTP HTTP 1. Message is transferred from client to server. Message transfer is from client to server or the other way round 2. It uses TCP. It uses TCP. 3. It uses port 25 for transmission. It uses port 80 for transmission. 4. SMTP messages are to be read by humans. HTTP messages are to be read and understood by the HTTP servers and HTTP clients 5. These messages are first stored and then forwarded These messages are immediately delivered . Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 20. Que 1.13. Describe internet. Answer Internet: 1. The internet is a globally existing network of networks consisting of a huge number of computers located in all the parts of the world. 2. All the computers connected to the internet are part of this huge network. 3. Networking is interconnection of computers. Generally the networking topologies used for networking are star, bus, ring, etc. 4. When a limited number of computers are to be interconnected, the local area network (LAN) is used. But in the internet the interconnection is achieved even via satellites. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556
  • 21. Que 1.14. Differentiate between X.25 and frame relay. Answer S.No. X.25 frame relay 1. X.25 networks work at speed up to 64 kbps. Frame relay operates at higher speed of 1.5 Mbps. 2. Frames are delivered more reliably than frame relay. Frames are delivered unreliably than X.25. 3. Frames are delivered in order. Frames are not delivered in order. 4. Bad frames can be received back by sending acknowledgement signal. Bad frames are discarded by frame relay 5. X.25 provides flow control. Frame relay does not provide flow control. Downloaded by somya singh (radheeshyam1176@gmail.com) lOMoARcPSD|39396556