36.

87.

38.

39.

40.

Two computers A and B have IPv4 addresses 10.14.2.115 and 10.14.2.90 respectively. Which
of the following should not be used as a subnet mask for both, if both A and B should belong
to the same subnet?

(A) 255.255.255.0 (B) 255.255.255.128
(©) 255.255.255.192 (D) 4

Identify the correct sequence in which the following packets are transmitted on the network
by a host when a browser requests a webpage from a remote server, assuming that the host
has just been restarted :

(A) DNS query, HTTP GET, TCP SYN
(B) DNS query, TCP SYN, HTTP GET
(© HTTP GET, DNS query, TCP SYN
(D) TCP SYN, DNS query, HTTP GET

Consider the following two statements :
$1: Destination MAC address of an ARP reply message is a broadcast address.
$2: Destination MAC address of an ARP request message is a broadcast address.
Which one of the following is correct?
(A) BothS1 and 82 are false (8) 8118 19186 and S2 is true
(0 S1lis true and 82 is false (D) BothS1 and 82 are true

Consider the two well-known hard problems :

“Factorization Problem” (FP) and “Discrete Logarithm Problem” (DLP). The Security of RSA
cryptosystem is

(A) Lost when FP has a polynomial time solution but is not affected when DLP has a
polynomial time solution

(B) Lost when DLP has a polynomial time solution but is not affected when FP has a
polynomial time solution

(C) Lost when either FP or DLP has a polynomial time solution
(D) Lost only when both FP and DLP have polynomial time solutions

Alice digitally signs a message (say, using RSA digital signature scheme) and sends it to Bob.
Verification of the signature by Bob requires :

(^) Alice’s public key ൯) Bob's public key
(0) 21००४ private key (D)_Bob’s private key

132/2023 8 A