Computer Network MCQ – DNS – Part 4

December 15, 2021 John Howard

Networking MCQs questions with answers to prepare for exams, tests, and certifications. These questions are taken from a real written exam and some parts are taken from an interview. So you will find questions on CCNA, TCP/IP, Protocols, IP addressing issues, OSI model, and more. This MCQ will easily prepare anyone to pass their exam.

1. A host with the domain name pc1.room1.nasa.gov. is at _______ level in the DNS hierarchy tree. (The root is level one.)

A Third

B Fourth

C Fifth

D None of the above

2. DNS can use the services of ________ using port 53.

A UDP

B TCP

C Both A and B are true.

D None of the above

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DNS uses TCP for zone transfer and UDP for domain name queries, both normal (primary) and reverse queries. UDP can be used to exchange small information, while TCP must be used to exchange information larger than 512 bytes.

3. DNS can be described as an inversed hierarchical tree with a root node at the top and a maximum of ________.

A 128 levels

B 129 levels

C 130 levels

D 131 levels

To have a hierarchical namespace, DNS was designed. In this design, names are defined in an inversed tree with the root at the top. The tree can only have 128 levels: from level 0 (the root) to level 127.

4. The domain used to map an IP address to a DNS name is called ________.

A Generic domains

B Reverse domain

C Primary domains

D Subdomains

The reverse domain is used to map an address to a name. This can happen, for example, when a server has received a request from a client to perform a task. This type of request is called a reverse request or pointer (PTR).

5. The port used for encapsulation by the DNS server is ____.

A 80

B 443

C 23

D 53

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6. A full domain name always ends with ______.

A 1 nœud

B 2 nœuds

C 0 nœud

D Null nœud

Each node in the tree has a domain name. A complete domain name is a sequence of labels separated by dots (.). Domain names are always read from the node to the root. The last label is the root label (null). This means that a complete domain name always ends with a null label, which means that the last character is a dot because the null string is nothing.

7. On the Internet, the domain name tree is divided into three ______.

A different steps

B different layers

C different components

D different sections

On the Internet, the domain name space (tree) is divided into three different sections: generic domains, national domains are associated with a country. and the reverse domain (resolution of an IP address into a domain name with a special domain “in-addr.arpa” added at the end).

Generic domains

National domains

Reversed domain

8. FQDN means ______.

A Filled Quality Domain Name

B Fully Qualified Domain Name

C First Qualified Domain Name

D False Quality Domain Name

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9. xxx.yyy.com is a ______.

A PQDN

B DDNS

C FQDN

D All the answers are true

10. In the Domain Name System (DNS), a contiguous part of the entire tree is called ______.

A Host

B Server

C Domain

D Zone

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1. A host with the domain name pc1.room1.nasa.gov. is at _______ level in the DNS hierarchy tree. (The root is level one.)

2. DNS can use the services of ________ using port 53.

3. DNS can be described as an inversed hierarchical tree with a root node at the top and a maximum of ________.

4. The domain used to map an IP address to a DNS name is called ________.

5. The port used for encapsulation by the DNS server is ____.

6. A full domain name always ends with ______.

7. On the Internet, the domain name tree is divided into three ______.

Generic domains

National domains

Reversed domain

8. FQDN means ______.

9. xxx.yyy.com is a ______.

10. In the Domain Name System (DNS), a contiguous part of the entire tree is called ______.

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