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12th Computer Applications - DNS (Domain Name System) Model Question Paper

Published on: 19/10/2019

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.

Questions + Answers key

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Std: 12th Standard - Computer Applications

chapter: - Model Question paper

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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

Which of the following initiates the mapping of domain name to IP address?

(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

Maximum characters used in the label of a node?

(a)

255

(b)

128

(c)

(d)

Which of the following notation is used to denote IPv4 addresses?

(a)

Binary

(b)

Dotted-decimal

(c)

Hexadecimal

(d)

a and b

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

6 x 2 = 12

What is Server?

Write any four generic Top Level Domain.

What is a resolver?

10.

What are the types of URL?

11.

What is an URL?

12.

List any four domain names.

Generic 3

2 x 3 = 6

13.

What are the fundamentals of URL?

14.

Differentiate IPv4 and IPv6.

Generic 5

1 x 5 = 5

15.

Explain how the DNS is working.

Fill in the blanks

5 x 1 = 5

16.

_______isa group of contiguous domains and sub domains in the Domain Name Space.

17.

_________provides to clients when queried by them.

18.

________is a tree like structure with root element on the top.

19.

IPv6 address is a_________unique address given to a computer or a device.

20.

_______is a logical address used to uniquely identify a computer over the Network.

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Answers Key:

Multiple Choice Question

6 x 1 = 6

(d)
Name servers

(d)
server

(d)
a and b

(a)
Domain name system

Generic 2

6 x 2 = 12

Name server manages the database of domain names and corresponding IP addresses

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

(i) The resolver is a program which is responsible for initiating the translation of a domain name into an IP address.
(ii) Since a resolver is stored in the host. There is no need of any protocol to form a connection between the resolver and the user program.

10.

The URL is divided into 2 types
(i) Absolute URL
(ii) Relative URL

11.

URL (Uniform Resource Locator) is the address of a document on the Internet. URL is made up of four parts: protocols, hostname, folder name and file name. Each part has its own specified functions.

12.

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

2 x 3 = 6

13.

(i) URL is made up four parts-protocols, hostname, folder name and file name. .
(ii) Each part has its own specific functions. Depending on the applications, additional information can be added to the URL but the common and fundamental URL consists of these four parts.
a. Protocol
b. Domain name/Hostname
c. Folders
d. The file name with extension

14.

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

15.

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.