Computer Networks | Set 14

This question for practice purpose for GATE CS Exam.

Ques-1: Which of the following is not true about Subnetting?

(A) It can be applied only for single network.
(B) It is used to improve security.
(C) Here, bits are borrowed from network ID portion.
(D) Here, bits are borrowed from host ID portion.

Explanation:
In Subnetting bits are borrowed from host ID portion.

So, option (C) is false.



Ques-2: Which device uses logical addressing system?

(A) Hub
(B) Switch
(C) bridge
(D) Router

Explanation:
Since, Router can use logical as well as physical addressing system.

So, option (D) is true.

Ques-3: In which of the following protocol(s) it is possible for sender to receive acknowledgement for a packet that falls outside its current window?

(A) Selective repeat protocol
(B) Stop and wait protocol
(C) Go back N protocol
(D) All of the above

Explanation:
Here, All of the above protocols allow delayed acknowledgement. For more about these protocols see Selective repeat protocol, Stop and wait protocol, and Go back N protocol.

So, option (D) is true.

Ques-4: What is the network ID of the IP address 225.100.123.70?

(A) 225.100.123.71
(B) 225.100.123.72
(C) 225.100.123.75
(D) It does not has any network ID



Explanation:
It is Class D IP and class D IP does not has any network ID part, i.e., no division of network ID and host ID part.

So, option (D) is true.

Ques-5: Which of the following is not true about Supernetting?

(A) It is used to increase security.
(B) It is applicable for two or more networks.
(C) Bits are borrowed from network ID portion.
(D) It is used to improve flexibility of IP address allotment.

Explanation:
Since, Supernetting can not be used to improve security of the network.

So, option (A) is untrue.



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