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1. Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
help.mbaassignments@gmail.com
or
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ASSIGNMENT
PROGRAM MCA(REVISED FALL 2012)
SEMESTER THIRD
SUBJECT CODE & NAME MCA3050- ADVANCED COMPUTER NETWORKS
CREDIT 4
BK ID B1650
MAX. MARKS 60
Note: Answer all questions. Kindly note that answers for 10 marks questions should be
approximately of 400 words. Each question is followed by evaluation scheme.
Q. 1. Differentiate between Physical addresses and Logical addresses.
Answer:In simplest terms, an address generated by the CPU is known as a logical address. Logical
addresses are also referred to as virtual addresses. From the perspective of a program that is
running,anitemseemstobe locatedinthe addressprovidedbythe logical address.Physical address
(also called the real addresses) is the address seen by the memory unit and it allows accessing a
particular memory cell in the main memory by the data bus.
The OSI model is a good place to start to learn more about the differences between physical and
logical addressing. Think of the physical address
Q. 2. Describe about DWDM. Explain the components of a basic DWDM system
Answer:Shortfor Dense Wavelength Division Multiplexing, an optical technology used to increase
bandwidth over existing fiber optic backbones.
DWDM works by combining and transmitting multiple signals simultaneously at different
wavelengths on the same fiber. In effect, one
Q. 3. Describe about Peak cell rate (PCR) and Sustained cell rate (SCR).
Answer: If a service (or application) wishes to use a broadband network (an ATM network in
particular) to transport a particular kind of traffic, it must first inform the network about what kind

2. of traffic is to be transported, and the performance requirements of that traffic. The application
presents this information to the network in the form a traffic contract.
An example of trafficthatrequiresthistype of service categoryare variable rate, compressed video
streams.Sourcesthatuse rt-VBR connectionsare expectedtotransmitata rate that varieswithtime
(forexample,trafficthatcan be consideredbursty).Real-time VBRconnectionscanbe characterized
by a PeakCell Rate (PCR), Sustained Cell Rate (SCR), and Maximum Burst Size (MBS). Cells delayed
beyond the value specified by the maximum CTD
Q. 4. Describe the following:
a) Open Shortest Path First (OSPF) protocol
Answer:OpenShortestPath First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It
uses a link state routing algorithm and falls into the group of interior routing protocols, operating
withinasingle autonomoussystem (AS). It is defined as OSPF Version 2 in RFC 2328 (1998) for IPv4.
The updates for IPv6 are specified as OSPF Version 3 in RFC 5340 (2008).
OSPF is perhaps the most widely used interior
b) Broader Gateway Routing Protocol (BGP)
Answer:Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to
exchange routingandreachabilityinformationbetween autonomous systems (AS) on the Internet.
The protocol is oftenclassifiedasapath vectorprotocol but issometimesalsoclassed as a distance-
vector routing protocol. The Border Gateway Protocol makes routing decisions based on paths,
networkpolicies,orrule-setsconfiguredby a network administrator and is involved in making core
routing decisions.
BGP may be used for routing within an AS. In this
Q. 5. Write short notes on:
a) Cryptography: Cryptography prior to the modern age was effectively synonymous with
encryption, the conversion of information from a readable state to apparent nonsense. The
originatorof an encrypted message shared the decoding technique needed to recover the original
information only with intended recipients, thereby precluding unwanted persons from doing the
same.Since WorldWar I and the adventof the computer, the methods used to carry out cryptology
have become increasingly complex and its application more widespread.
b) Encryption:In cryptography, encryption is the process of encoding messages or information in
such a way that only authorized parties can read it. Encryption does not of itself prevent
interception, but denies the message

3. c) Decryption:Decryptionisthe reverse process to Encryption. Frequently, the same Cipher is used
for both Encryption and Decryption. While Encryption creates a Ciphertext from a Plaintext,
Decryption creates a Plaintext from a Ciphertext. The process of decoding data that has been
encrypted into a secret format. Decryption requires a secret key or password. Decryption is the
process of converting ciphertext back to plaintext. To encrypt more than a small amount of data,
symmetric encryption is used. A symmetric
d) Cryptanalysis:Cryptanalysisreferstothe studyof ciphers,ciphertext,orcryptosystems(thatis,to
secret code systems) with a view to finding weaknesses in them that will permit retrieval of the
plaintextfromthe ciphertext,withoutnecessarilyknowingthe keyorthe algorithm.Thisisknown as
breaking the cipher, ciphertext, or cryptosystem.
Cryptanalysisisthe study of analyzing information systems in order to study the hidden aspects of
the systems. Cryptanalysis is used to breach
e) Cryptology:Cryptology is the mathematics, such as number theory, and the application of
formulas and algorithms, that underpin cryptography and cryptanalysis. Since the cryptanalysis
concepts are highly specialized and
Q. 6. Differentiate between Single server queue and Multi-server queue
Answer:Queueingtheoryisthe mathematicalstudy of waitinglines,orqueues. Inqueueingtheory a
model is constructed so that queue lengths and waiting time can be predicted.Queueing theory is
generally considered a branch of operations research because the results are often used when
makingbusinessdecisionsaboutthe resourcesneededtoprovideaservice. Queueing theory has its
origins in research by Agner Krarup Erlang when he created models to describe the Copenhagen
telephone exchange. The ideas have since
Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
help.mbaassignments@gmail.com
or
call us at : 08263069601