Discussion on DNS: DNS-Domain Name System, Design Goals and Objectives
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Topics
- Definition of DNS
- Design goals and objectives
- How DNS works
- Components and functions
- Parts of a Domain Name
- Basic Working of DNS
- Address resolution mechanism
DNS-Domain Name System
- It is normally used in a client-server approach.
- To locate a resource on a computer, users have to name the computer.
- It is a user-oriented names are used to identify Internet resources. Basically, names are symbolic names and identify not only the computer but also its location on the Internet.
- Main Objective of DNS is to translate a user-oriented name to an IP address which is 32 bit long.
- For Example: If you want to know the internet address of en. wikipedia. org, it is 145.97. 39.155.
Design Goals and Objectives
- Creation of a global, scalable , consistent name space: It provide a consistent and predictable method for naming devices and resources, so they could be easily found.
- Local control over local resources: Administrators of networks and small internet works on the internet as a whole needed to have a control over to the naming of their own devices.
- Distributed design to avoid bottlenecks
- Multiple underlying protocol support
- Hardware universality.
How DNS Works
Components and Functions
- Name space: is somewhat analogous to how a directory system on a computer organizes files from general to specific, using an arbitrary structure.
- Name registration (including administration and authorities) : is used to enter individual names into the DNS distributed database.
- Name Resolution: DNS uses a powerful, distributed, client/server name resolution mechanism.
Parts of a Domain Name
Domain name usually consists of two or more parts, separated by dots. Example: google. com
- The rightmost label conveys the top-level domain
- Each label to the left specifies a subdivision or subdomain of the domain
- A hostname refers to a domain name that has one or more associated IP addresses.
Basic Working of DNS
Address Resolution Mechanism
A DNS recursor consults three name servers to resolve the address www.wikipedia.org
MCQ
Q 1. DNS is a ________ approach.
- Client
- Server
- Client-server
- Server-client
Answer: 3. Client-Server
Q 2. Mapping a name to an address or an address to a name is called________
- Name-address Generations
- Name-address Abbreviations
- Name-address Resolution
- Name-address Information
Answer: 3. Name-Address Resolution
#Definition of DNS
#Design goals and objectives
#How DNS works
#Components and functions
#Parts of a Domain Name
#Address resolution mechanism
✍ Mayank