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

1 .

_____ is the multiplexing technique that shifts each signal to a different carrier frequency.

A)

TDM

B)

PDM

C)

FDM

D)

None of the Above

Correct Answer : Option (C) : FDM

Explanation : FDM is an abbreviation for Frequency Division Multiplexing. This technique is used when the bandwidth of the channel is greater than the combined bandwidth of all the signals which are to be transmitted. The channel is active at all times unless a collision occurs with another channel trying to use the same frequency. Some other multiplexing techniques are Time division multiplexing and Phase division multiplexing.

2 .

The attacker using a network of compromised devices is known as _____

A)

D-net

B)

Telnet

C)

Internet

D)

Botnet

Correct Answer : Option (D) : Botnet

Explanation : Botnet is a network of compromised devices used by the attacker without the owner’s knowledge to perform unethical activities such as spamming. The attacker usually uses the least secure devices to create the botnet.

3 .

The DoS attack, in which the attacker establishes a large number of half-open or fully open TCP connections at the target host is _______

A)

UDP Flooding

B)

Vulnerability Attack

C)

Bandwidth Flooding

D)

Connection Flooding

Correct Answer : Option (D) : Connection Flooding

Explanation : In Vulnerability attack, the attacker exploits the vulnerable control points of the network to deny access to the victims. In Bandwidth flooding, the attacker intentionally uses up all the bandwidth by flooding the victim with a deluge of packets and makes sure that the victim can’t use any bandwidth. In UDP flooding, too many UDP packets are sent by the attacker to the victim at random ports.

4 .

The DoS attack, in which the attacker sends deluge of packets to the targeted host is ________

A)

Bandwidth flooding

B)

UDP flooding

C)

Vulnerability attack

D)

Connection flooding

Correct Answer : Option (A) : Bandwidth flooding

Explanation : In Bandwidth flooding, the attacker floods the victim machine with a deluge of packets to make sure that no bandwidth is available. The victim then cannot utilize the complete bandwidth to perform its operation.

5 .

Packet sniffers involve ______

A)

Active receiver

B)

Passive receiver

C)

Legal receiver

D)

Partially-active receiver

Correct Answer : Option (B) : Passive receiver

Explanation : The function of packet sniffers is to just silently receive the packets flowing in the channel. If they inject any packets into the channel, they might alert the other users about the intrusion.

6 .

Firewalls are often configured to block ________

A)

TCP traffic

B)

Sensitive traffic

C)

UDP traffic

D)

Best-effort traffic

Correct Answer : Option (C) : UDP traffic

Explanation : UDP is more vulnerable to attacks, so firewalls are often configured to block suspicious UDP traffic.

7 .

In TDM, slots are further divided into _____

A)

Bits

B)

Packets

C)

Frames

D)

Seconds

Correct Answer : Option (C) : Frames

Explanation : TDM is the abbreviation for Time division multiplexing. It is technique for combining several low rate channels to a single high rate channel. For a certain time slot, the several channels could use the maximum bandwidth. Each channel is inactive for a period of time too. Some other multiplexing techniques are Frequency division multiplexing and Phase division multiplexing.

8 .

If link transmits 4000frames per second, and each slot has 8 bits, the transmission rate of circuit this TDM is _________

A)

32kbps

B)

32bps

C)

500bps

D)

500kbps

Correct Answer : Option (A) : 32kbps

Explanation :

Transmission rate= frame rate * number of bits in a slot.

Given: Frame rate = 4000/sec and number of bits in slot = 8

Thus, Transmission rate = (4000 * 8) bps

= 32000bps

= 32kbps

9 .

Which multiplexing technique used to transmit digital signals?

A)

FDM

B)

WDM

C)

FDM & WDM

D)

TDM

Correct Answer : Option (D) : TDM

Explanation : TDM abbreviation for Time Division Multiplexing is a method used for digital signals. Whereas FDM and WDM abbreviation for Frequency Division Multiplexing, and Wavelength Division Multiplexing, are used for analog signals. TDM is used in applications like ISDN (Integrated Services Digital Network) and PSTN (Public Switched Telephone Network).

10 .

Multiplexing is used in _______

A)

Data switching

B)

Circuit switching

C)

Packet switching

D)

Packet & Circuit switching

Correct Answer : Option (B) : Circuit switching

Explanation : Circuit switching is a switching method by which one can obtain a physical path between end points. Circuit switching method is also called a connection oriented network. Two nodes must be physically and logically connected to each other to create a circuit switching network.