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

1 .

Network layer firewall works as a ________

A)

frame filter

B)

signal filter

C)

packet filter

D)

content filter

Correct Answer : Option (C) : packet filter

Explanation : As you know, firewalls are available as hardware appliances, as software-only, or a combination of the two. In every case, the purpose of a firewall is to isolate your trusted internal network (or your personal PC) from the dangers of unknown resources on the Internet and other network connections that may be harmful. The firewall prevents unauthorized access to your internal, trusted network from outside threats.

2 .

Extensible authentication protocol is authentication framework frequently used in ______

A)

wired local area network

B)

wireless networks

C)

wired personal area network

D)

wired metropolitan area network

Correct Answer : Option (B) : wireless networks

Explanation : The Extensible Authentication Protocol (EAP) is an authentication protocol used to connect a network node to the Internet. It designed through extending the methods used by the Point-to-Point Protocol for authentication.

3 .

When a DNS server accepts and uses incorrect information from a host that has no authority giving that information, then it is called _________

A)

DNS lookup

B)

DNS spoofing

C)

DNS hijacking

D)

DNS authorizing

Correct Answer : Option (B) : DNS spoofing

Explanation : In DNS spoofing, also known as DNS cache poisoning, an attacker gets the valid credentials from a victim by spoofing the intended resource, and tricking the victim to give his/her valid authorization credentials.

4 .

What is the access point (AP) in a wireless LAN?

A)

wireless devices itself

B)

both device that allows wireless devices to connect to a wired network and wireless devices itself

C)

device that allows wireless devices to connect to a wired network

D)

all the nodes in the network

Correct Answer : Option (C) : device that allows wireless devices to connect to a wired network

Explanation : Access point in a wireless network is any device that will allow the wireless devices to a wired network. A router is the best example of an Access Point.

5 .

Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?

A)

CDMA

B)

ALOHA

C)

CSMA/CD

D)

CSMA/CA

Correct Answer : Option (D) : CSMA/CA

Explanation : CSMA/CA stands for Carrier-sense multiple access/collision avoidance. It is a multiple access protocol used by IEEE 802.11 standard for wireless LAN. It’s based on the principle of collision avoidance by using different algorithms to avoid collisions between channels.

6 .

Mostly ________ is used in wireless LAN.

A)

orthogonal frequency division multiplexing

B)

time division multiplexing

C)

space division multiplexing

D)

channel division multiplexing

Correct Answer : Option (A) : orthogonal frequency division multiplexing

Explanation : In orthogonal frequency division multiplexing, digital data is encoded on multiple carrier frequencies. It is also used in digital television and audio broadcasting in addition to Wireless LANs.

7 .

What is Wired Equivalent Privacy (WEP)?

A)

security algorithm for emails

B)

security algorithm for ethernet

C)

security algorithm for usb communication

D)

security algorithm for wireless networks

Correct Answer : Option (D) : security algorithm for wireless networks

Explanation : WEP is a security algorithm for wireless network which intended to provide data confidentiality comparable to that of traditional wired networks. It was introduced in 1997.

8 .

What is WPA?

A)

wi-fi process access

B)

wi-fi protected access

C)

wired process access

D)

wired protected access

Correct Answer : Option (B) : wi-fi protected access

Explanation : WPA or WiFi Protected Access is a security protocol used to provide users and firms with strong data security and protection for their wireless networks (WiFi) to give them confidence that only authorized users can access their network.

9 .

SONET stands for __________

A)

stream optical network

B)

shell operational network

C)

synchronous optical network

D)

synchronous operational network

Correct Answer : Option (C) : synchronous optical network

Explanation : SONET stands for synchronous optical network. Frame relay uses SONET to physically transmit data frames over a Frame Relay network as SONET is cheaper and provides better network reliability than other carriers.

10 .

The photonic layer of the SONET is similar to the __________ of OSI model.

A)

network layer

B)

data link layer

C)

physical layer

D)

transport layer

Correct Answer : Option (C) : physical layer

Explanation : The photonic layer in SONET is like the physical layer of the OSI model. It is the lowest layer among the four layers of SONET namely the photonic, the section, the line, and the path layers.