Midterm Answers

1. ..................... are rules that govern a communication exchange?

a) Media

b) Criteria

c) Protocols (week1-1.ppt slide 9 and from my presentation handout notes that i told in the class)

d) All of the above

2. The .................. is the physical path over which a message travels.

a) Protocol

b) Medium (week1-1.ppt slide 9 and from my presentation handout notes that i told in the class)

c) Signal

d) All of the above

3. Frequency of a failure and network recovery time after a failure is measures of the .............. of a network.

a) Performance

b) Reliability (week1-1.ppt slide 13 )

c) Security

d) Feasibility

4. The performance of a data communication network depends on ........................

a) The number of users

b) The transmission media

c) The hardware and software

d) All of the above (week1-1.ppt slide 13 )

5. Viruses are network ................... issue.

a) Performance

b) Reliability

c) Security (week1-1.ppt slide 13 )

d) Management

6. The information to be communicated in a data communication system is the ....................

a) Medium

b) Protocol

c) Message (week1-1.ppt slide 9 and from my presentation handout notes that i told in the class)

d) Transmission

7. ..................... is the division of one task among multiple computers.

a) Distributed Processing (week1-1.ppt slide 10)

b) Distributed Messaging

c) Distributed Telephony

d) Electronic Messaging

8. Which topology requires a central controller or hub?

a) Mesh

b) Star (week1-1.ppt slide 26)

c) Bus

d) Ring

9. Which topology requires a multipoint connection?

a) Mesh

b) Star

c) Bus (week1-1.ppt slide 28)

d) Ring

10. In a network with 25 computers, which topology would require the most extensive cabling?

a) Mesh (week1-1.ppt slide 25 and calculation according to knowledge)

b) Star

c) Bus

d) Ring

11. A television broadcast to people is an example of ......................... transmission

a) Simplex (week1-1.ppt slide 31 and according to knowledge)

b) Half-duplex

c) Full-duplex

d) Automatic

12. In a .............. topology, if there are n devices in a network, each device has n(n-1)/2 links.

a) Mesh (week1-1.ppt slide 25 and from my presentation handout notes that i told in the class)

b) Star

c) Bus

d) Ring

13. A ....................... connection provides a dedicated link between two devices.

a) Point-to-point (week1-1.ppt slide 19)

b) Multipoint

c) Primary

d) Secondary

14. In a .......................... connection, more than two devices can share a link.

a) Point-to-point

b) Multipoint (week1-1.ppt slide 19)

c) Primary

d) Secondary

15. A cable breaks in a ....................... topology stops all transmission

a) Mesh

b) Bus (week1-1.ppt slide 28 and from my presentation handout notes that i told in the class)

c) Star

d) Primary

16. The OSI model layers in the correct order are;

a) Physical, Data link, Transport, Network, Presentation, Session, Application

b) Presentation, Data link, Network, Transport, Session, Physical, Application

c) Physical, Transport, Data link, Network, Session, Presentation, Application

d) Physical, Data link, Network, Transport, Session, Presentation, Application (week1-2.ppt slide 5)

17. The segmentation of the entire message is the responsibility of the ............... layer.

a) Network

b) Transport (week1-2.ppt slide 21)

c) Session

d) Presentation

18. The ................ layer decides the location of synchronization points.

a) Data link

b) Transport

c) Session (week1-2.ppt slide 25)

d) Presentation

19. In the .................. layer, framing occurs.

a) Physical

b) Data link (week1-2.ppt slide 14)

c) Network

d) Transport

20. Decryption and Encryption of data are the responsibility of the ...................

a) Physical

b) Data link

c) Presentation (week1-2.ppt slide 27)

d) Session

21. Dialog control is a function of the ................ layer.

a) Transport

b) Session (week1-2.ppt slide 25)

c) Presentation

d) Application

22. Mail services and directory services are available to network users through .............. layer.

a) Data link

b) Session

c) Transport

d) Application (week1-2.ppt slide 29)

23. Node-to-node delivery of the data unit is the responsibility of the ................ layer.

a) Physical

b) Data link (week1-2.ppt slide 13)

c) Transport

d) Network

24. The .................... layer lies between the network layer and the session layer.

a) Physical

b) Data link

c) Transport (week1-2.ppt slide 5)

d) Presentation

25. The ........................ layer can use trailer of the frame for error detection.

a) Physical

b) Data link (week1-2.ppt slide 14-15 and from my presentation handout notes that i told in the class)

c) Transport

d) Presentation

26. Session layer checkpoints ..........................

a) Allows just a portion of a file to be resent. (week1-2.ppt slide 24-25 and from my presentation handout notes that i told in the class)

b) Detect and recover errors

c) Control the addition of headers

d) Are involved in dialog control.

27. In distance vector routing, each router receives vectors from ......................

a) Every router in the network

b) Every router less than two units away

c) A table stored by the software

d) Its neighbors only (week2-2.ppt slide 16)

28. ................. cable consists of an inner copper core and a second conducting outer sheath.

a) Twisted-pair

b) Coaxial (week1-2.ppt slide 39 and from my presentation handout notes that i told in the class)

c) Fiber-optic

d) Shielded twisted-pair

29. In fiber optics, the signal source is ...................... waves.

a) Light (week1-2.ppt slide 40)

b) Radio

c) Infrared

d) Very low frequency

30. What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable ?

a) Inner conductor

b) Diameter of cable

c) Outer conductor (week1-2.ppt slide 39 and from my presentation handout notes that i told in the class)

d) Insulating material

31. The RG number gives us information about .......................

a) Twisted pairs

b) Coaxial cables (week1-2.ppt slide 39)

c) Optical fibers

d) All of the above.

32. The inner core of an optical fiber is ...................... in composition

a) Glass or plastic (week1-2.ppt slide 40)

b) Copper

c) Bimetallic

d) Liquid

33. In cellular telephony, a service area is divided into small regions called ............

a) Cells (week1-2.ppt slide 48)

b) cell offices

c) MTSO’s

d) Relay sites

34. Which of the following is not an internetworking device?

a) Bridge (week2-1.ppt slide 5)

b) Gateway

c) Router

d) All of the above

35. Which of the following devices can not filter traffic ?

a) Bridge and Hub

b) Repeater and Hub (week2-2.ppt slide 6 and 10)

c) Repeater and Bridge

d) Bridge and Router

36. Which of the following are bridge types?

a) Simple, complex, transparent

b) Simple, transparent, multiport (week2-1.ppt slide 14)

c) Simple, complex, multiport

d) Spanning, contract, suspension

37. What does MTSO stands for?

e) Mobile Transfer Switching Office

f) Mobilized Telecommunication Switching Office

g) Message Transfer Switching Office

h) Mobile Telephone Switching Office (week1-2.ppt slide 48)

38. If a router has two or more routing tables, in this case it is called ……..

a) Multi-port router

b) Multi-point router

c) Multi-table router

d) Multi-protocol router (week2-1.ppt slide 26)

39. Which of the following algorithm is used to prevent loops in LANs.

a) Link state algorithm

b) Distance vector algorithm

c) Spanning tree algorithm (week2-1.ppt slide 16)

d) Dijkstra algorithm

40. In an LSP, the advertiser is .....................

a) A router (week2-2.ppt slide 32)

b) A network

c) A data packet

d) None of the above

41. ……… is the process of linking network components from various levels of the network architecture ?

a) Network binding (week3-1.ppt slide 38)

b) Network services

c) Network printing

d) Network directory-share

42. A repeater takes a weakened or corrupted signal and ................ it.

a) Amplifies

b) Regenerates (week2-1.ppt slide 9)

c) Resamples

d) Reroutes

43. What type of bridge must have its address table entered manually?

a) Simple

b) Transparent

c) Multiport

d) A and c (week2-1.ppt slide 14)

44. Which type of bridge builds and updates its tables from address information in packets?

a) Simple

b) Transparent (week2-1.ppt slide 14)

c) A and b

d) None of the above

45. In which routing method do all the routers have a common database?

a) Distance vector

b) Link state (week2-2.ppt slide 35)

c) Link vector

d) None of the above

46. A router using distance vector routing has the following routing table.

Net2 6 A
Net3 4 E

               Net4    3     A
               Net6    2     D
               Net7    1     B

The router receives the following packet from C:

Net2 4
Net3 5

               Net4    2
               Net5    3
               Net6    3
               Net7    2

What is the updated routing table?

c) To intercepting a request when an application or a user requests. (week3-1.ppt slide 11 and 13)

Bonus Questions

51. Passwords are used to improve the …………….. of a network.

52. The central hub in a tree topology contains a …………. to regenerate the received data.

53. A brouter supports two protocols. If it receives a packet related to these protocol, it acts as a ……………….

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