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CHAPTER 1
Introduction
Solutions to Odd-Numbered Review Questions and Exercises
Review Questions
1. The five components of a data communication system are the sender, receiver,
transmission medium, message, and protocol.
3. The three criteria are performance, reliability, and security.
5. Line configurations (or types of connections) are point-to-point and multipoint.
7. In half-duplex transmission, only one entity can send at a time; in a full-duplex
transmission, both entities can send at the same time.
9. The number of cables for each type of network is:
a. Mesh: n (n – 1) / 2
b. Star: n
c. Ring: n – 1
d. Bus: one backbone and n drop lines
11. An internet is an interconnection of networks. The Internet is the name of a spe-
cific worldwide network
13. Standards are needed to create and maintain an open and competitive market for
manufacturers, to coordinate protocol rules, and thus guarantee compatibility of
data communication technologies.
Exercises
15. With 16 bits, we can represent up to 216 different colors.
17.
a. Mesh topology: If one connection fails, the other connections will still be work-
ing.
b. Star topology: The other devices will still be able to send data through the hub;
there will be no access to the device which has the failed connection to the hub.
c. Bus Topology: All transmission stops if the failure is in the bus. If the drop-line
fails, only the corresponding device cannot operate.
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