Forouzan Chapter 8 MCQ

Question 1

Packet-switched networks can also be divided into _________ subcategories: virtual-circuit networks and datagram networks.
A) five B) two
B) three D) four

Answer 1

two

Question 2

In __________, each packet is treated independently of all others.
A) circuit switching C) frame switching
B) datagram switching D) none of the above

Answer 2

datagram switching

Question 3

Based on the Clos criteria, if N = 200, then k must be equal to or greater than _________.
A) 19 C) 31
B) 21 D) 41

Answer 3

19

Question 4

In _________, resources are allocated on demand.
A) circuit switching C) frame switching
B) datagram switching D) none of the above

Answer 4

datagram switching

Question 5

. In _______ switching, the paths in the circuit are separated from one another spatially.
A) time-division C) space-division
B) two-dimensional D) three-dimensional

Answer 5

space-division

Question 6

In a ________ network, two types of addressing are involved: global and local.
A) datagram C) circuit-switched
B) virtual-circuit D) none of the above

Answer 6

virtual-circuit

Question 7

In a three-stage space division switch, if N = 200, the number of crosspoints is ______.
A) 40,000 C) greater than 40,000
B) less than 40,000 D) greater than 100,000

Answer 7

less than 40,000

Question 8

A ________ network is made of a set of switches connected by physical links, in which each link is divided into n channels.
A) circuit-switched C) frame-switched
B) line-switched D) none of the above

Answer 8

circuit-switched

Question 9

In a banyan switch, for 8 inputs and 8 outputs, we have _____ micro-switches at each stage.
A) 2 C) 4
B) 3 D) 8

Answer 9

4

Question 10

In _________, there is no resource allocation for a packet.
A) circuit switching C) frame switching
B) datagram switching D) none of the above

Answer 10

datagram switching

Question 11

A _________ network is a cross between a circuit-switched network and a datagram network. It has some characteristics of both.
A) packet-switched C) virtual-circuit
B) frame-switched D) none of the above

Answer 11

virtual-circuit

Question 12

The most popular technology in time-division switching is called the _________.
A) TSI C) ITS
B) STI D) none of the above

Answer 12

TSI

Question 13

A switched WAN is normally implemented as a _______ network.
A) virtual-circuit C) circuit-switched
B) datagram D) none of the above

Answer 13

virtual-circuit

Question 14

. We can say that a packet switch has _______ types of components.
A) four C) two
B) three D) none of the above

Answer 14

four

Question 15

In a one-stage space division switch, if N = 200, the number of crosspoints is ______.
A) 20,000 C) 30,000
B) 40,000 D) 10,000

Answer 15

40,000

Question 16

In a banyan switch, for 8 inputs and 8 outputs, we have _____ stages.
A) 2 C) 4
B) 3 D) 8

Answer 16

3

Question 17

. A switch in a datagram network uses a routing table that is based on the ______ address.
A) destination C) local
B) source D) none of the above

Answer 17

destination

Question 18

Traditionally, _____ methods of switching have been important.
A) six C) four
B) five D) three

Answer 18

three

Question 19

The network layer in the Internet is designed as a __________ network.
A) circuit-switched C) virtual-circuit
B) datagram D) none of the above

Answer 19

datagram

Question 20

A ________ switch combines space-division and time-division technologies to take advantage of the best of both.
A) SSS C) TTT
B) TST D) none of the above

Answer 20

TST

Question 21

In _______, the resources need to be reserved during the setup phase; the resources remain dedicated for the entire duration of data transfer phase until the teardown phase.
A) frame switching C) circuit switching
B) datagram switching D) none of the above

Answer 21

circuit switching

Question 22

Based on the Clos criteria, if N = 200, then n must be equal to or greater than ____.
A) 40 C) 20
B) 30 D) 10

Answer 22

10

Question 23

Circuit switching takes place at the ________ layer.
A) physical C) network
B) data line D) transport

Answer 23

physical

Question 24

A ________ switch combines crossbar switches in several (normally three) stages.
A) multiple path C) multistage
B) multiple crossbar D) none of the above

Answer 24

multistage

Question 25

In _______ there are no setup or teardown phases.
A) circuit switching C) frame switching
B) datagram switching D) none of the above

Answer 25

datagram switching

Question 26

. We can divide today’s networks into ____ broad categories.
A) five
B) four D) two

Answer 26

three

Question 27

A ________ switch is a multistage switch with microswitches at each stage that route the packets based on the output port represented as a binary string.
A) TSI C) crossbar
B) banyan D) none of the above

Answer 27

banyan

Question 28

The _______ address in the header of a packet in a datagram network normally remains the same during the entire journey of the packet.
A) destination C) local
B) source D) none of the above

Answer 28

destination

Question 29

. Based on the Clos criteria, if N = 200, then the minimum number of crosspoints is greater than or equal to _______.
A) 42,000 C) 18,000
B) 20,000 D) 15,200

Answer 29

15,200

Question 30

The simplest type of switching fabric is the ______ switch.
A) crossbar C) TSI
B) crosspoint D) STS

Answer 30

crossbar