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                                   CHAPTER SEVEN ANSWERS TO REVIEW QUESTIONS
 

1. The mainframe network connects similar types of devices located far from each other. A local area network (LAN) connects dissimilar devices located near each other.

2. The two components comprising a computer network are hardware and software.

3. The four tasks performed by software on a communication network are (choose four of these):
a. communication between the mainframe and terminals
b. terminal definition
c. error checking
d. control data flow
e. control access to a local area network (LAN)

4. Protocol is the name of the rule that describes how two devices will talk to one another on a communication network.

5. The OSI model provides a standard for communication protocols and was developed to give software developers an alternative to the proprietary protocols developed by computer manufacturers.

6. Devices from different manufacturers cannot communicate with each other.

7. The application and presentation layers.

8. Transport.

9. Packets.

10. Functions performed by the data link layer include:
a. flow control
b. error control
c. creates frames

11. Binary Synchronous Communication (BSC) is the most common character-oriented protocol.

12. Byte-count-oriented protocol is better than BSC because it is full duplex thus eliminating the transparency problem.

13. The bit pattern used as a flag is 01111110, which indicates the beginning and end of a frame.

14. The three layers of the OSI model used by the X.25 protocol are physical, data link, and network.

15. TCP/IP.

16. The differences between the X.400 and the X.500 are the X.400 dictates how e-mail will be sent and the X.500 describes how a public directory for e-mail will be created.

17. Xmodem – file transfer, starts with NAK.
  Kermit – both computers must run it, CRC.
  X.PC – packet-switching network (X.25), CRC.

18. CSMA/CD – contention.
  Token passing – equal access to media.

19. CSMA/CD – Ethernet.
  Token Passing ARCNET, token ring, FDDI.

20. AppleTalk is the name of the Macintosh network protocol.