Computer Networking Quiz (or) Computer Networking MCQ (Multiple Choice Questions)

1 .

Which one of the following authentication method is used by SSH?

A)

Password

B)

Public-key

C)

Host based

D)

All of the above

Correct Answer : Option (D) : All of the above

Explanation : SSH used public key authentication, Password authentication, Host based authentication, keyboard authentication and authentication of servers.

2 .

DHCP (dynamic host configuration protocol) provides _______ to the client.

A)

IP address

B)

Url

C)

MAC address

D)

None of the above

Correct Answer : Option (A) : IP address

Explanation : We use DHCP to allow the hosts to acquire their ip addresses dynamically which is better than visiting each and every host on the network and configure all of this information manually.

3 .

DHCP is used for ________

A)

IPv6

B)

IPv4

C)

Both IPv6 and IPv4

D)

None of the above

Correct Answer : Option (C) : Both IPv6 and IPv4

Explanation : DHCP is used for both IPv4 and IPv6 addressing. With DHCP you get to let the hosts know about the change dynamically, and hosts update their info themselves.

4 .

IP assigned for a client by DHCP server is____

A)

Not time dependent

B)

For a limited period

C)

For an unlimited period

D)

None of the above

Correct Answer : Option (B) : For a limited period

Explanation : The IP address offered to a client is only for a limited period of time. There is actually a certain amount of time that the client can use and keep this IP address.

5 .

DHCP uses UDP port ____for sending data to the server.

A)

66

B)

67

C)

68

D)

69

Correct Answer : Option (B) : 67

Explanation : 67 is the UDP port number that is used as the destination port of a server. Whereas UDP port number 68 is used by the client.

6 .

The DHCP server can provide the _______ of the IP addresses.

A)

Static allocation

B)

Automatic allocation

C)

Dynamic allocation

D)

All of the above

Correct Answer : Option (D) : All of the above

Explanation : When a host acquires multiple offers of IP addresses from different DHCP servers, the host will broadcast a dhcp request identifying the server whose offer has been accepted.

7 .

What is DHCP snooping?

A)

Algorithm for DHCP

B)

Encryption of the DHCP server requests

C)

Techniques applied to ensure the security of an existing DHCP infrastructure

D)

None of the above

Correct Answer : Option (C) : techniques applied to ensure the security of an existing DHCP infrastructure

Explanation : DHCP snooping is a security feature that is used in OS of a network in the layer 2. This technology prevents unauthorized DHCP servers offering IP addresses to DHCP clients.

8 .

If DHCP snooping is configured on a LAN switch, then clients having specific ______ can access the network.

A)

IP address

B)

MAC address

C)

Both MAC address and IP address

D)

None of the above

Correct Answer : Option (C) : Both MAC address and IP address

Explanation : The DHCP snooping is done to prevent unauthorized IP addresses being offered by unauthorized servers. This features allows only specific mac addresses and IP addresses to access the network.

9 .

IPSec is designed to provide security at the _______

A)

Network layer

B)

Session layer

C)

Transport layer

D)

Application layer

Correct Answer : Option (A) : Network layer

Explanation : IPSec is a set of protocols used to provide authentication, data integrity and confidentiality between two machines in an IP network. In the TCP/IP model, it provides security at the IP layer i.e. the network layer.

10 .

In tunnel mode, IPSec protects the ______

A)

IP trailer

B)

Entire IP packet

C)

IP header

D)

IP payload

Correct Answer : Option (B) : Entire IP packet

Explanation : In the tunnel mode, IPSec adds control bits into the packets to encrypt the entire packet between the IPSec endpoints. Using encryption, it provides secure communication between the two endpoints.