Computer Architecture And Organization Set 10 MCQs

Q1 | Beyond IP, UDP provides additional services such as

routing and switching

sending and receiving of packets

multiplexing and demultiplexing

demultiplexing and error checking

Q2 | What is the main advantage of UDP?

more overload

reliable

low overhead

fast

Q3 | What is the header size of a UDP packet?

8 bytes

8 bits

16 bytes

124 bytes

Q4 | The port number is “ephemeral port number”, if the source host is

ntp

echo

server

client

Q5 | “Total length” field in UDP packet header is the length of

only udp header

only data

only checksum

udp header plus data

Q6 | Which is the correct expression for the length of UDP datagram?

udp length = ip length – ip header’s length

udp length = udp length – udp header’s length

udp length = ip length + ip header’s length

udp length = udp length + udp header’s length

Q7 | The field is used to detect errors over the entire user datagram.

udp header

checksum

source port

destination port

Q8 | Which of the following is false with respect to TCP?

connection-oriented

process-to-process

transport layer protocol

unreliable

Q9 | In TCP, sending and receiving data is done as

stream of bytes

sequence of characters

lines of data

packets

Q10 | TCP groups a number of bytes together into a packet called

packet

buffer

segment

stack

Q11 | Communication offered by TCP is

full-duplex

half-duplex

semi-duplex

byte by byte

Q12 | Suppose a TCP connection is transferring a file of 1000 bytes. The first byte is numbered 10001. What is the sequence number of the segment if all data is sent in only one segment?

10000

10001

12001

11001

Q13 | Bytes of data being transferred in each connection are numbered by TCP. These numbers start with a

fixed number

random sequence of 0’s and 1’s

one

sequence of zero’s and one’s

Q14 | The value of acknowledgement field in a segment defines

sequence number of the byte received previously

total number of bytes to receive

sequence number of the next byte to be received

sequence of zeros and ones

Q15 | Two broad categories of congestion control are

open-loop and closed-loop

open-control and closed-control

active control and passive control

active loop and passive loop

Q16 | Retransmission of packets must not be done when

packet is lost

packet is corrupted

packet is needed

packet is error-free

Q17 | In Go-Back-N window, when the timer of the packet times out, several packets have to be resent even some may have arrived safe. Whereas in Selective Repeat window, the sender resends

packet which are not lost

only those packets which are lost or corrupted

packet from starting

all the packets

Q18 | Closed-Loop control mechanisms try to

remove after congestion occurs

remove after sometime

prevent before congestion occurs

prevent before sending packets

Q19 | The technique in which a congested node stops receiving data from the immediate upstream node or nodes is called as

admission policy

backpressure

forward signaling

backward signaling

Q20 | The packet sent by a node to the source to inform it of congestion is called

explicit

discard

choke

backpressure

Q21 | In the slow-start algorithm, the size of the congestion window increases until it reaches a threshold.

exponentially

additively

multiplicatively

suddenly

Q22 | Which is not a application layer protocol?

http

smtp

ftp

tcp

Q23 | The packet of information at the application layer is called

packet

message

segment

frame

Q24 | Which one of the following is an architecture paradigms?

peer to peer

client-server

http

both peer-to-peer & client-server

Q25 | Application layer offers service.

end to end

process to process

both end to end and process to process

none of the mentioned