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ISRO CS 2019 : CN Booster Quiz 3

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Question 1

Consider the following statement about TCP/IP protocol and select which one is incorrect
I. This model was initially used by ARPANET
II. Minimum size of TCP/IP header is 26 bytes
III. TCP/IP model supports only connectionless communication in network layer
IV. In TCP/IP there is no clear distinction between services, interface, and protocols

Question 2

Assume that the main web page (index.html) is a HTML file of size 350,000 bytes and the MSS is 1400 bytes. Further assume that the sequence number for the very first TCP segment carrying that data stream is 0. How many TCP segments are needed in total to transmit that HTML page?
Assume there are no packet losses and timeouts.

Question 3

Consider OSPF algorithm, which updates every 20 minutes. Each update has 2 LSA each LSA is 26 bytes in length, header is 28 bytes. Find the bandwidth used for advertising LSA.

Question 4

Consider a network having 6 nodes A, B, C, D E and F. The measured delay between A to B , A to D and A to C are 4, 5 and 6 respectively. Which of the following is routing table A using distance vector routing? The vector tables of B, D, C are given as follows
A B C D E F
Vector table of B = (2 0 4 4 3 2)
Vector table of C = (5 4 0 2 7 4)
Vector table of D = (5 1 3 0 3 6)

Question 5

Diffie-Hellman Algorithm is used for shared key exchange. Without sending the actual key both the party will get to know about key. Which of the following is the shared key that is used in Diffie-Hellman? Where p is a prime number and g is a base. ‘a’ and ‘b’ are the secret number that is chosen by both the party.

Question 6

A satellite channel of capacity of B bits/sec, the frame size L bits, and round trip propagation time of R sec uses stop and wait protocol, what is the channel utilization U?

Question 7

You have a class B network 172. 16. 0. 0. You use 11 bits for subnetting. Which of the following is a correct range of IP addresses that belong to the same network?

Question 8

Find the perfect matching –

Question 9

Assume for a network layer representation connection establishment overhead is 100 bytes and disconnection overhead is 28 bytes. What would be the minimum size of packet the transport layer should keep if it wishes to keep datagram services above the network layer and needs to keep its overhead to a minimum of 12.5% (ignore transport layer overhead)?

Question 10

In OSI model, at which layer HTTP works:

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