Secure Shell (SSH) and Domain Name Server (DNS)
SSH provides strong encryption and authentication for remote login, command execution, and file transfer between machines. DNS is a distributed database that maps domain names to IP addresses through a hierarchy of name servers. It allows clients to find IP addresses for websites through queries to authoritative DNS servers. DNS organization involves storing records with domain names, IP addresses, and time-to-live information in a tree-like structure maintained across root, top-level, and authoritative name servers.
A Domain Name System assigns an alphabetic name to a numeric IP address and is made up of multiple Domain Name servers that enable IP address mapping for devices on the Internet (usually servers).
Internet Technology Lectures
URL-DNS
Lecturer: Saman M. Almufti / Kurdistan Region, Nawroz University
facebook: https://www.facebook.com/saman.malmufti
YouTube link: https://youtu.be/pOx04uODo5o
A Domain Name System assigns an alphabetic name to a numeric IP address and is made up of multiple Domain Name servers that enable IP address mapping for devices on the Internet (usually servers).
Internet Technology Lectures
URL-DNS
Lecturer: Saman M. Almufti / Kurdistan Region, Nawroz University
facebook: https://www.facebook.com/saman.malmufti
YouTube link: https://youtu.be/pOx04uODo5o
Top 10 interview question and answers for mcsahopesuresh
Hope Tutors provide Top 15 Windows Server Interview Questions & Answers, which is helpful to system admins who are attending the interview. So kindly follow and prepare for the interviews.
Different ways of enumerating or discovering subdomains for given domain. As we know, enumeration is the key when it comes to hacking; enumerating subdomains leads to discovering many untouched surfaces having the vulnerabilities.
Active Directory & LDAP Authentication Without TriggersPerforce
See how to build Active Directory and LDAP authentication into the Perforce Server, streamlining the process of linking your Perforce environment with your enterprise authentication system—no triggers required!
The application layer sits at Layer 7, the top of the Open Systems Interconnection (OSI) communications model. It ensures an application can effectively communicate with other applications on different computer systems and networks. The application layer is not an application.
Top 10 interview question and answers for mcsahopesuresh
Hope Tutors provide Top 15 Windows Server Interview Questions & Answers, which is helpful to system admins who are attending the interview. So kindly follow and prepare for the interviews.
Different ways of enumerating or discovering subdomains for given domain. As we know, enumeration is the key when it comes to hacking; enumerating subdomains leads to discovering many untouched surfaces having the vulnerabilities.
Active Directory & LDAP Authentication Without TriggersPerforce
See how to build Active Directory and LDAP authentication into the Perforce Server, streamlining the process of linking your Perforce environment with your enterprise authentication system—no triggers required!
The application layer sits at Layer 7, the top of the Open Systems Interconnection (OSI) communications model. It ensures an application can effectively communicate with other applications on different computer systems and networks. The application layer is not an application.
Computer Networks Module 1 - part 2.pdfShanthalaKV
18CS52 VTU Computer Network & Security
MODULE 1-Part 2
DNS; The Internet's Directory Service: Services Provided by DNS, Overview of How DNS Works, DNS Records and Messages, Peer-to-Peer Applications: P2P File Distribution, Distributed Hash Tables, Socket Programming: creating Network Applications: Socket Programming with UDP, Socket Programming with TCP.
Domain Name System and Dynamic Host Configuration Protocol.pptxUsmanAhmed269749
Introduction to DNS and DHCP. The presentations highlights the introduction of Domain name System and Dynamic Host Configuration Protocol. These are essential study part in computer networking
A complete Coverage of DNS and its features. This ppt deals with well balanced practical and theoretical aspects of DNS. The best ppt for a novice learner.
User interface is the front-end application view to which user interacts in order to use the software. The analysis and design process of a user interface is iterative and can be represented by a spiral model.
The class of affine array access, where each array index is expressed as affine expressions of loop indexes and symbolic constants.
1.Affine Accesses
2.Affine and Nonaffine Accesses in Practice
3.Exercises for Section 11.4
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
1. Secure Shell (SSH)
and
Domain Name Server (DNS)
R.K.Ishwariya
M.sc(cs).,
Nadar Saraswathi College of Arts and Science,
Theni.
2. Secure Shell (SSH)
• Secure Shell (SSH) One of the oldest applications: remote login SSH is a
secure protocol for this purpose: • Log into a remote machine • Execute
commands on that machine • Transport files from one machine to another
SSH provides: • Strong encryption, server authentication, integrity protection
• Compression (optional) • An own secure transport layer protocol SSH
protocol is subdivided into: • Connection Protocol • Authentication Protocol
• Transport Layer Protocol
3.
4. Domain Name Server (DNS)
• Domain Name Server (DNS) in Application Layer. DNS is a host name to IP
address translation service. DNS is a distributed database implemented in a hierarchy
of name servers. It is an application layer protocol for message exchange between
clients and servers.
5. Domain
• There are various kinds of DOMAIN :
• Generic domain : .com(commercial) .edu(educational) .mil(military) .org(non
profit organization) .net(similar to commercial) all these are generic domain.
• Country domain .in (india) .us .uk
• Inverse domain if we want to know what is the domain name of the website.
Ip to domain name mapping.So DNS can provide both the mapping for
example to find the ip addresses of geeksforgeeks.org then we have to type
nslookup www.geeksforgeeks.org
7. • It is Very difficult to find out the ip address associated to a website because there are millions of
websites and with all those websites we should be able to generate the ip address immediately,
there should not be a lot of delay for that to happen organization of database is very important.
DNS record – Domain name, ip address what is the validity?? what is the time to live ?? and all
the information related to that domain name. These records are stored in tree like structure.
• Namespace – Set of possible names, flat or hierarchical . Naming system maintains a collection
of bindings of names to values – given a name, a resolution mechanism returns the
corresponding value –
• Name server – It is an implementation of the resolution mechanism.. DNS (Domain Name
System) = Name service in Internet – Zone is an administrative unit, domain is a subtree.
Organization of Domain
8. Name to Address Resolution
• The host request the DNS name server to resolve the domain
name. And the name server returns the IP address corresponding
to that domain name to the host so that the host can future connect
to that IP address.
9. H ierarchy of Name Servers
• Root name servers – It is contacted by name servers that can not resolve
the name. It contacts authoritative name server if name mapping is not
known. It then gets the mapping and return the IP address to the host.
• Top level server – It is responsible for com, org, edu etc and all top level
country domains like uk, fr, ca, in etc. They have info about authoritative
domain servers and know names and IP addresses of each authoritative
name server for the second level domains.
10. • Authoritative name servers This is organization’s DNS server, providing
authoritative hostName to IP mapping for organization servers. It can be
maintained by organization or service provider. In order to reach cse.dtu.in
we have to ask the root DNS server, then it will point out to the top level
domain server and then to authoritative domain name server which actually
contains the IP address. So the authoritative domain server will return the
associative ip address.
11. Domain Name Server
• The client machine sends a request to the local name server, which , if root
does not find the address in its database, sends a request to the root name
server , which in turn, will route the query to an intermediate or authoritative
name server. The root name server can also contain some hostName to IP
address mappings . The intermediate name server always knows who the
authoritative name server is. So finally the IP address is returned to the local
name server which in turn returns the IP address to the host.
