29.

30.

31.

32.

33.

34.

35.

Pick the statement which does not satisfy for GSM :
(A) Is less secure
(B) Operates on spread spectrum technique
(C) Uses SIM card
(D) Uses TDMA technique

UPS requires :
(^) Only rectifier (8) Only inverter
(C) Both inverter and rectifier (D) None of these

The following are pairs of ISO-OSI layers/sub-layers and functionalities in which one of them
is incorrect. Identify the incorrect pair :

(A) Medium Access Control, Channel sharing

(B) Data Link Layer, Bit synchronization

(C) Network Layer, Routing

(D) Transport Layer, End-to-End process communication

A sender, which employs Stop and Wait ARQ technique, wants to send 10 packets to a
receiver. Assume that the channel is noisy and every 4 packet sent by the sender is lost.
How many packets the sender will have to send in total so that the receiver receives all the
10 packets correctly?

(A) 21 ൪൫ 12
(0 18 (D) 20

Consider the message M = 1010001101. The cyclic redundancy check (CRC) code for this
message using the divisor (generator) polynomial x* + x* + x” +1 is:

(A) 10101 (B) 01011

(C) 01110 (D) 10110

A sender A, which employs Sliding Window protocol, wants to send 64 byte packets to a
receiver B. Assume that the Round Trip Time is 80 milliseconds, and the maximum
bandwidth of the channel connecting A and B is 64 kbps. What is the optimal window size
that A should use?

(A) 10 (B) 20
(0 40 (D) 80

A sender A sends an IPv4 packet D to a receiver B. Assume that D reached B without any
error. Which of the following header fields of D would have changed during transit?

0 TTL
Gi) Checksum
(A) @ only (B) Gi) only
(C) Both @) and (ii) (D) None of these

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