Questions and answers for exam Preparation

MCQs

Total Questions : 26 | Page 2 of 3 pages

Which one of the following is not a client-server application ?

Internet chat
Web browsing
E-mail
Ping

Discuss Question

Answer: Option D. -> Ping

Internet- Chat is maintained by chat servers, web browsing is sustained by web servers, E-mails are stored at mail servers, but ping is an utility which is used to identify connection between any two computer. One can be client, other can be client or server anything but aim is to identify whether connection exists or not between the two.

Question 12.
Which one of the following statements is FALSE?

Packet switching leads to better utilization of bandwidth resources than circuit switching.
Packet switching results in less variation in delay than circuit switching
Packet switching requires more per packet processing than circuit switching.
Packet switching can lead to reordering unlike in circuit switching.

Discuss Question

Answer: Option B. -> Packet switching results in less variation in delay than circuit switching

Question 13.

One of the header fields in an IP datagram is the Time-to-Live (TTL) field. Which of the following statements best explains the need for this field ?

It can be used to prioritize packets
It can be used to reduce delays
It can be used to optimize throughput
It can be used to prevent packet looping

Discuss Question

Answer: Option D. -> It can be used to prevent packet looping

Time to live field in IP datagram signifies the time stamp for which that packet is valid, if it reaches to a particular hop late than this time stamp it needed to be discorded. This prevents looping of packets.

Question 14.
Which of the following assertions are FALSE about the Internet Protocol (IP)?

It is possible for a computer to have multiple IP addresses
IP packets from the same source to the same destination can take different routes in the network
IP ensures that a packet is discarded if it is unable to reach its destination within given number of hops
The packet source cannot set the route of an outgoing packets; the route is determined only by the routing tables in the routers on the way

Discuss Question

Answer: Option D. -> The packet source cannot set the route of an outgoing packets; the route is determined only by the routing tables in the routers on the way

Question 15.
Protocol normally used in live streaming of video/audio:

TCP
UDP
SCTP
None of these

Discuss Question

Answer: Option B. -> UDP

Question 16.

TYPICALLY, WHEN USING THE TELNET PROTOCOL, YOU WOULD BE USING WHICH OF FOLLOWING PROTOCOL PORT PAIRS ?

TCP-23
SCTP-23
UDP-23
TCP-21

Discuss Question

Answer: Option B. -> SCTP-23

Question 17.

Station A uses 32 byte packets to transmit messages to Station B using a sliding window protocol. The round trip delay between A and B is 80 milliseconds and the bottleneck bankwidth on the path between A and B is 128 kbps. What is the optimal window size that A should use ?

Discuss Question

Answer: Option B. -> 40

Path bandwidth = 128 kbps
Time delay = 80 ms
Total data 80*128*10³*10^-3 bits
= (80*128)/8 bytes
= 1280 bytes.
1 packet size = 32 byte
No. of packets = 1280/32
= 40