DNS Questions & Answers

Computer Networks Questions & Answers – DNS

This set of Computer Networks Multiple Choice Questions & Answers (MCQs) focuses on “DNS”.

1. Which one of the following allows client to update their DNS entry as their IP address change?
a) dynamic DNS
b) mail transfer agent
c) authoritative name server
d) none of the mentioned

Explanation: Dynamic DNS, also known as DDNS or DynDNS, allows a name server in the DNS to be automatically updated. This doesn’t necessitate any manual editing.

2. Wildcard domain names start with label _______
a) @
b) *
c) &
d) #

Explanation: Requests to a non-existent domain name are matched by a wildcard DNS record. The asterisk “*” at the beginning of a domain name specifies this wildcard DNS record.

3. The right to use a domain name is delegated by domain name registers which are accredited by _______
a) internet architecture board
b) internet society
c) internet research task force
d) internet corporation for assigned names and numbers

Explanation: The ICANN (Internet Corporation for Assigned Names and Numbers) is in charge of IP address allocation, protocol identifier assignment, and the management of generic and country code Top Level Domain Name Systems (gTLD and ccTLD).

4. The domain name system is maintained by _______
a) distributed database system
b) a single server
c) a single computer
d) none of the mentioned

Explanation: A distributed database system manages the domain name system. It’s a collection of logically interconnected databases spread across a computer network.

5. Which one of the following is not true?
a) multiple hostnames may correspond to a single IP address
b) a single hostname may correspond to many IP addresses
c) a single hostname may correspond to a single IP address
d) none of the mentioned

Explanation: A single hostname does not have to relate to an IP address. Facebook.com and fb.com, for example, have the same IP address. As a result, a single IP address might have several hostnames.

6. The entire hostname has a maximum of ___________
a) 255 characters
b) 127 characters
c) 63 characters
d) 31 characters

Explanation: A total of 255 characters can be used in a hostname. Each label, however, must be between 1 and 63 characters long. A host name is a label that is assigned to a network device.

7. A DNS client is called _________
a) DNS updater
b) DNS resolver
c) DNS handler
d) none of the mentioned

Explanation: DNS client, also known as DNS resolver or DNS lookup, is a programme that aids in the resolution of DNS requests utilising an external DNS server.

8. Servers handle requests for other domains _______
a) directly
b) by contacting remote DNS server
c) it is not possible
d) none of the mentioned

Explanation: When a request from another domain arrives at the server, it handles the problem by contacting a distant DNS server.

9. DNS database contains _______
a) name server records
b) hostname-to-address records
c) hostname aliases
d) all of the mentioned

Explanation: The Domain Name System (DNS) is responsible for not just mapping IP addresses to hostnames, but also for information transmission within the server.

10. If a server has no clue about where to find the address for a hostname then _______
a) server asks to the root server
b) server asks to its adjcent server
c) request is not processed
d) none of the mentioned

Explanation: Root name servers are extremely significant and necessary since they are the initial step in converting human-readable hostnames into IP addresses for communication.

DNS is a hierarchical and global naming system for computers, services, and other resources that are connected to the Internet or a private network. It links numerous pieces of information to domain names assigned to each of the participants. Most notably, it converts domain names into numerical IP addresses, which are required for locating and identifying computer services and devices using the underlying network protocols. Since 1985, the Domain Name System has been a critical component of the Internet’s functionality by providing a global, distributed directory service.

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