Chapter 1
Introduction
True-False Questions
1. In the earliest stages of telephone use, to call one telephone from another required the
two telephones to be directly connected by a pair of wires carrying electricity.
Answer: True Difficulty: Medium Page
Reference:
3
2. FDM uses digital signaling techniques to carry telephone conversations.
Answer: False Difficulty: Medium Page
Reference:
7
3. Time division multiplexing (TDM) ,which was introduced in the early 1960s, was based
on digital signaling techniques.
Answer: True Difficulty: Medium Page
Reference:
7
,4. The first successful wire-sharing technique was called frequency division multiplexing
(FDM).
Answer: True Difficulty: Easy Page
Reference:
6
5. To use frequency division multiplexing (FDM), a process was needed to convert analog
signals into digital signals required by the FDM system.
Answer: False Difficulty: Medium Page
Reference:
7
6. Glass fibers can carry very large numbers of calls simultaneously.
Answer: True Difficulty: Easy Page
Reference:
8
7. Using a technique called wavelength division multiplexing (WDM), one strand of optical
fiber can carry as man as 129,024 conversations at the same time.
Answer: True Difficulty: Medium Page
Reference:
8
, 8. Computers do not possess voices. Their exchanges involve transmitting the bits (0s and
1s) that represent computer data. Because of this, the name data communications was
adopted to distinguish it from voice communications between people.
Answer: True Difficulty: Medium Page
Reference:
8
9. A variation of FDM called statistical time division multiplexing (STDM), was the packet
switched network, focused from the start on robust, computer-based transmission.
Answer: False Difficulty: Medium Page
Reference:
9
10. Toward the end of the 1980s, the ARPANET was opened to the general public, and from
there the development of the Internet ensued.
Answer:True Difficulty: Medium Page
Reference:
10
11. A major leap forward in distance communication had its roots in the discovery of
electricity and the development of several of its applications.
Answer: True Difficulty: Easy Page Reference: 1
, 12. To achieve minimum practical wire sharing, telephone companies had to determine the
maximum bandwidth required for a conversation to be of reasonable quality.
Answer: False Difficulty: Hard Page Reference: 7
13. The biggest advantage of public packet data networks (PDNs) was cost; it was generally
far less expensive to send computer data over a PDN than over the regular telephone
network.
Answer: True Difficulty: Medium Page Reference: 10
14. The OSI reference model, a de facto standard of the ISO standards organization, views
networks as having seven distinct functional groups, called layers.
Answer: False Difficulty: Medium Page Reference: 14
15. BITNET was a widely used network promoted by AT&T based on UNIX.
Answer: False Difficulty: Medium Page Reference: 22
16. FDM is the same technique that allows multiple radio and television stations to
transmit their programs simultaneously over the same medium (air), yet allow an
individual radio or television set to tune into a particular broadcast apart from all the
others.
Answer: True Difficulty: Medium Page Reference: 7
Introduction
True-False Questions
1. In the earliest stages of telephone use, to call one telephone from another required the
two telephones to be directly connected by a pair of wires carrying electricity.
Answer: True Difficulty: Medium Page
Reference:
3
2. FDM uses digital signaling techniques to carry telephone conversations.
Answer: False Difficulty: Medium Page
Reference:
7
3. Time division multiplexing (TDM) ,which was introduced in the early 1960s, was based
on digital signaling techniques.
Answer: True Difficulty: Medium Page
Reference:
7
,4. The first successful wire-sharing technique was called frequency division multiplexing
(FDM).
Answer: True Difficulty: Easy Page
Reference:
6
5. To use frequency division multiplexing (FDM), a process was needed to convert analog
signals into digital signals required by the FDM system.
Answer: False Difficulty: Medium Page
Reference:
7
6. Glass fibers can carry very large numbers of calls simultaneously.
Answer: True Difficulty: Easy Page
Reference:
8
7. Using a technique called wavelength division multiplexing (WDM), one strand of optical
fiber can carry as man as 129,024 conversations at the same time.
Answer: True Difficulty: Medium Page
Reference:
8
, 8. Computers do not possess voices. Their exchanges involve transmitting the bits (0s and
1s) that represent computer data. Because of this, the name data communications was
adopted to distinguish it from voice communications between people.
Answer: True Difficulty: Medium Page
Reference:
8
9. A variation of FDM called statistical time division multiplexing (STDM), was the packet
switched network, focused from the start on robust, computer-based transmission.
Answer: False Difficulty: Medium Page
Reference:
9
10. Toward the end of the 1980s, the ARPANET was opened to the general public, and from
there the development of the Internet ensued.
Answer:True Difficulty: Medium Page
Reference:
10
11. A major leap forward in distance communication had its roots in the discovery of
electricity and the development of several of its applications.
Answer: True Difficulty: Easy Page Reference: 1
, 12. To achieve minimum practical wire sharing, telephone companies had to determine the
maximum bandwidth required for a conversation to be of reasonable quality.
Answer: False Difficulty: Hard Page Reference: 7
13. The biggest advantage of public packet data networks (PDNs) was cost; it was generally
far less expensive to send computer data over a PDN than over the regular telephone
network.
Answer: True Difficulty: Medium Page Reference: 10
14. The OSI reference model, a de facto standard of the ISO standards organization, views
networks as having seven distinct functional groups, called layers.
Answer: False Difficulty: Medium Page Reference: 14
15. BITNET was a widely used network promoted by AT&T based on UNIX.
Answer: False Difficulty: Medium Page Reference: 22
16. FDM is the same technique that allows multiple radio and television stations to
transmit their programs simultaneously over the same medium (air), yet allow an
individual radio or television set to tune into a particular broadcast apart from all the
others.
Answer: True Difficulty: Medium Page Reference: 7
