12th Computer Applications - DNS (Domain Name System) Book Back Questions | QB365

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12th Computer Applications - DNS (Domain Name System) Book Back Questions

Published on: 06/09/2019

DNS (Domain Name System)

Download Tamil Nadu 12th Standard Computer Applications question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 12th Standard - Computer Applications

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Questions:

Multiple Choice Question

6 x 1 = 6

In earlier, websites were accessed through their

(a)

Name server

(b)

Label

(c)

IP address

(d)

Resolver

ISP stands for

(a)

International Service provider

(b)

Internet Service Provider

(c)

Internet service Protocol

(d)

Index service provider

Which is the contiguous area up to which the server has access?

(a)

Zone

(b)

Domain

(c)

Resolver

(d)

Name servers

Pick the odd one out from the following

(a)

node

(b)

label

(c)

domain

(d)

server

In the domain name, the sequence of labels is separated by

(a)

Semicolon (;)

(b)

dot (.)

(c)

colon (:)

(d)

NULL

Which of the following is used to maintain all the directories of domain names?

(a)

Domain name system

(b)

Domain name space

(c)

Name space

(d)

IP address

Generic 2

3 x 2 = 6

Write any four generic Top Level Domain.

What is a domain?

List any four domain names.

Generic 3

3 x 3 = 9

10.

Differentiate web address and URL

11.

What are the differences between Absolute URL and Relative URL?

12.

Differentiate IPv4 and IPv6.

Generic 5

1 x 5 = 5

13.

Explain how the DNS is working.

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Answers Key:

Multiple Choice Question

6 x 1 = 6

(b)
Internet Service Provider

(a)
Zone

(d)
server

(b)
dot (.)

(a)
Domain name system

Generic 2

3 x 2 = 6

Domain Name	Meaning
com	Commerical Organistion
edu	Education Institutions
gov	Government (US)
mil	Military groups

Domain is a sub tree in domain name space tree structure.

Domain Name	Meaning
TLD	Top Level Domains
ccTLD	country code Top Level Domains.
gTLD	generic Top Level Domains.
IDN ccTLD	internationalised country code top-level domains.

Generic 3

3 x 3 = 9

10.

SI.No.	URL	Web address
1.	A URL is the address of a particular website, audio stream or document available on the web.	A web address more commonly defines a unique name that helps people remember a URL.
2.	URLs Consists of the internet protocol needed to access the item you wish to locate on the host computer	It is usually in simpler form, such as, www. google.com or www.Amazon.com. Generally your browser will recognize the proper URL when you type in a web address

11.

SI.No.	Absolute URL	Relative URL
1.	Absolute URL is the complete address of a document on the Internet.	Relative URL is the partial address of a document on the Internet.
2.	Absolute URL contains all the information that are required to find the files on the Internet.	Relative URL contains only file name or file name with folder name.
3.	If any of the four parts is missing, then the browser will not be able to link to the specific file. So, all the four parts are very important in absolute URL.	We can use this type of URL when the file is on the same server related to current document.

12.

No.	IPv4	IPv6
1.	IPv4 address is a 32 bit unique address given to a computer system.	IPv6 address is a 128 bit unique address given to a computer system.
2.	There are two ways to represent the IP address: Binary notation, Dotted-decimal notation.	It follows Hexadecimal number notation.
3.	The number of address that can be formed is 2³².	The number of addresses formed in IPv6 is 2¹²⁸

Generic 5

1 x 5 = 5

13.

DNS Works:
(i) When the user enters the URL in the browser, the system first checks it DNS cache for the corresponding IP address.
(ii) If the IP address is found in the cache, then the information is retrieved from cache.
(iii) If not, the system needs to query the resolver about the IP address from Internet Service Provider (ISP).
(iv) Each resolver has its own cache and if it is found in that then that information is retrieved.
(v) If not, then the query is passed to next domain server i.e., TLD (Top Level Domain) which reviews the request and direct the query to name servers associated with that specific domain.
(vi) Unitil the query is solved it is passed to next level domians. finally, the IP address is detected and the corresponding record is sent to the resolver.
(vii) Then the resolver returns the record back to the computer browser. Now the user can view the webpages for the detected IP address.