# Forouzan: MCQ in Switching

(Last Updated On: December 28, 2017)

This is the MCQ in Switching from book the Data Communications and Networking 4th Edition by Behrouz A. Forouzan. If you are looking for a reviewer in datacom, a topic in Electronics Systems and Technologies (Communications Engineering) this will definitely help you before taking the Board Exam.

In this particular topic you have learned the three fundamental switching methods: circuit switching, packet switching, and message switching. If you skip the summary visit Switching which is a method in which communication devices are connected to one another efficiently.

#### Begin and Good luck!

Choose the letter of the best answer in each questions.

1. Packet-switched networks can also be divided into ______subcategories: virtual-circuit networks and datagram networks.

• A)   five
• B)   three
• C)   two
• D)   four

Solution:

2. In __________, each packet is treated independently of all others.

• A)   circuit switching
• B)   datagram switching
• C)   frame switching
• D)   none of the above

Solution:

3. Based on the Clos criteria, if N = 200, then k must be equal to or greater than ______.

• A)   19
• B)   21
• C)   31
• D)   41

Solution:

4. In _________, resources are allocated on demand.

• A)   circuit switching
• B)   datagram switching
• C)   frame switching
• D)   none of the above

Solution:

5. In _______ switching, the paths in the circuit are separated from one another spatially.

• A)   time-division
• B)   two-dimensional
• C)   space-division
• D)   three-dimensional

Solution:

6. In a ________ network, two types of addressing are involved: global and local.

• A)   datagram
• B)   virtual-circuit
• C)   circuit-switched
• D)   none of the above

Solution:

7. In a three-stage space division switch, if N = 200, the number of crosspoints is ______.

• A)   40,000
• B)   less than 40,000
• C)   greater than 40,000
• D)   greater than 100,000

Solution:

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
• B)   line-switched
• C)   frame-switched
• D)   none of the above

Solution:

9. In a banyan switch, for 8 inputs and 8 outputs, we have _____ microswitches at each stage.

• A)   2
• B)   3
• C)   4
• D)   8

Solution:

10. In _________, there is no resource allocation for a packet.

• A)   circuit switching
• B)   datagram switching
• C)   frame switching
• D)   none of the above

Solution:

11. A _________ network is a cross between a circuit-switched network and a datagram network. It has some characteristics of both.

• A)   packet-switched
• B)   frame-switched
• C)   virtual-circuit
• D)   none of the above

Solution:

12. The most popular technology in time-division switching is called the _________.

• A)   TSI
• B)   STI
• C)   ITS
• D)   none of the above

Solution:

13. A switched WAN is normally implemented as a _______ network.

• A)   virtual-circuit
• B)   datagram
• C)   circuit-switched
• D)   none of the above

Solution:

14. We can say that a packet switch has _______ types of components.

• A)   four
• B)   three
• C)   two
• D)   none of the above

Solution:

15. In a one-stage space division switch, if N = 200, the number of crosspoints is ______.

• A)   20,000
• B)   40,000
• C)   30,000
• D)   10,000

Solution:

16. In a banyan switch, for 8 inputs and 8 outputs, we have _____ stages.

• A)   2
• B)   3
• C)   4
• D)   8

Solution:

17. A switch in a datagram network uses a routing table that is based on the ______ address.

• A)   destination
• B)   source
• C)   local
• D)   none of the above

Solution:

18. Traditionally, _____ methods of switching have been important.

• A)   six
• B)   five
• C)   four
• D)   three

Solution:

19. The network layer in the Internet is designed as a __________ network.

• A)   circuit-switched
• B)   datagram
• C)   virtual-circuit
• D)   none of the above

Solution:

20. A ________ switch combines space-division and time-division technologies to take advantage of the best of both.

• A)   SSS
• B)   TST
• C)   TTT
• D)   none of the above

Solution:

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
• B)   datagram switching
• C)   circuit switching
• D)   none of the above

Solution:

22. Based on the Clos criteria, if N = 200, then n must be equal to or greater than ____.

• A)   40
• B)   30
• C)   20
• D)   10

Solution:

23. Circuit switching takes place at the ________ layer.

• A)   physical
• B)   data line
• C)   network
• D)   transport

Solution:

24. A ________ switch combines crossbar switches in several (normally three) stages.

• A)   multiple path
• B)   multiple crossbar
• C)   multistage
• D)   none of the above

Solution:

25. In _______ there are no setup or teardown phases.

• A)   circuit switching
• B)   datagram switching
• C)   frame switching
• D)   none of the above

Solution:

26. We can divide today’s networks into ____ broad categories.

• A)   five
• B)   four
• C)   three
• D)   two

Solution:

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
• B)   banyan
• C)   crossbar
• D)   none of the above

Solution:

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
• B)   source
• C)   local
• D)   none of the above

Solution:

29. Based on the Clos criteria, if N = 200, then the minimum number of crosspoints is greater than or equal to _______.

• A)   42,000
• B)   20,000
• C)   18,000
• D)   15,200

Solution:

30. The simplest type of switching fabric is the ______ switch.

• A)   crossbar
• B)   crosspoint
• C)   TSI
• D)   STS

Solution: