CHAPTER 12: Networks and Data Communications An Overview Flashcards

1
Q

The sender and receiver end points, in a communications system, are referred to as

a) hosts.
b) end-users.
c) edge devices.
d) interface devices.

A

a) hosts.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Since data communication is predominantly serial, we usually describe the data as a

a) bit flow.
b) bit surge.
c) byte flow.
d) byte stream.

A

d) byte stream.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

To solve the related problems of channel availability and maximum utilization, there must be a way to break long messages into smaller units. These units are called

a) boxes.
b) packets.
c) envelopes.
d) containers.

A

b) packets.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A _________is equivalent to an envelope containing pages of data.

a) packet
b) message
c) segment
d) container

A

a) packet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

A direct USB connection between a smartphone and a personal computer is an example of

a) multicast.
b) broadcast.
c) one-to-many connection.
d) point-to-point connection.

A

d) point-to-point connection.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The typical communication channel is actually divided into segments; connections along the segments are called

a) links.
b) routes.
c) dedicated paths.
d) transmission paths.

A

a) links.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The rate of speed with which data can be moved successfully through the channel is usually measured as a

a) bit rate.
b) file rate.
c) block rate.
d) CPU cycle rate.

A

a) bit rate.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which is not an example of an unguided medium?

a) microwave
b) cellular phone
c) broadcast radio
d) USB connection from computer to smartphone

A

d) USB connection from computer to smartphone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Some channel characteristics are determined innately by the medium. For example, unguided messaging must be carried by an analog signal known as a

a) shipping signal.
b) carrier signal.
c) delivery signal.
d) transport signal.

A

b) carrier signal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Channels that carry messages in only one direction are known as

a) one-way channels.
b) simplex channels.
c) full duplex channels.
d) half-duplex channels.

A

b) simplex channels.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Channels that carry messages in both directions, but only one direction at a time, are called

a) simplex channels.
b) one-way channels.
c) full-duplex channels.
d) half-duplex channels.

A

d) half-duplex channels.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Channels that carry signals simultaneously in both directions are called

a) simplex channels.
b) one-way channels.
c) full-duplex channels.
d) half-duplex channels.

A

c) full-duplex channels.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

A relatively small number of standard protocols, consisting primarily of the _____________ protocol suites, satisfy nearly all of the communication requirements for modern data communication networks.

a) TCP/IP and UDP
b) TCP/IP and BGP
c) TCP/IP and ATM
d) TCP/IP and Ethernet

A

d) TCP/IP and Ethernet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In a __________ topology each computer node gets every message, but processes only those addressed to that node. There is no central hub in this topology.

a) star
b) bus
c) ring
d) mesh

A

b) bus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Which of the following topologies is used primarily for local area networks; all nodes are connected point- to-point to a central device that uses switching technology to connect pairs of nodes together?

a) star
b) bus
c) ring
d) mesh

A

a) star

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Which of the following topologies consists of point-to-point connections from each node on the network to the next node; the last node on the network is connected back to the first and there is no central hub?

a) star
b) bus
c) ring
d) mesh

A

c) ring

17
Q

Which type of topology describes the actual layout of the wiring for the network?

a) virtual
b) logical
c) tangible
d) physical

A

d) physical

18
Q

Which type of topology defines the operational relationship between the various network components?

a) virtual
b) logical
c) physical
d) tangible

A

b) logical

19
Q

Which type of network connects computers and other supporting devices over a relatively small localized area, typically a room, the floor of a building, a building, or multiple buildings within close range of each other?

a) LAN
b) CAN
c) WAN
d) Intranet

A

a) LAN

20
Q

The most familiar, and often most practical and useful, way to categorize networks is by their

a) geographical range of service.
b) medium used (coaxial cable, wireless, fiber).
c) standard specification number (802.3, 802.11, X.25).
d) usage (Web server, database server, peer-to-peer, storage area network).

A

a) geographical range of service.

21
Q

In a(n) ___________ hub, all of the connections at the hub are simply tied together inside the hub and the hub performs no operation or modification of the signals as they arrive at the hub.

a) active
b) layer 3
c) passive
d) intelligent

A

c) passive

22
Q

Which Ethernet technology uses radio-based signals to communicate to devices connected on the local area network?

a) Wi-Fi
b) ring Ethernet
c) mesh Ethernet
d) hub-based Ethernet

A

a) Wi-Fi

23
Q

Which Ethernet type is based logically on a star topology and when one node on the network wishes to communicate with another node, the switch sets up a direct connection between the two?

a) Star Ethernet
b) Ring Ethernet
c) Mesh Ethernet
d) Switched Ethernet

A

d) Switched Ethernet

24
Q

Each wireless unit is connected by radio to a base station _____________ that is somewhat equivalent to a hub.

a) media site
b) access site
c) media point
d) access point

A

d) access point

25
Q

Which type of network is used to interconnect local area networks? The primary motivation for this type of network is to improve overall performance of a larger network by creating separate local area networks for groups of users who communicate primarily with each other.

a) link networks
b) extended networks
c) connected networks
d) backbone networks

A

d) backbone networks

26
Q

In a wireless network where the access points are connected by radio, the mesh points operate at the ___________ and are essentially invisible to the upper layers of the network.

a) physical layer (layer 1)
b) transport layer (layer 4)
c) session layer 5 (layer 5)
d) media access control layer (layer 2)

A

d) media access control layer (layer 2)

27
Q

Operation of a metropolitan area network (MAN) generally requires

a) access servers.
b) peering agreements.
c) right of way access.
d) fiber optic transmission.

A

c) right of way access.

28
Q

An access router that is located between the public Internet and the internal LAN is called (a)n

a) edge router.
b) border router.
c) exchange router.
d) perimeter router.

A

a) edge router.

29
Q

Which type of network is designed to facilitate communications between users and applications over large distances—between the various corporate offices of an international organization that are located in cities all over the world, for example.

a) LAN
b) WAN
c) CAN
d) MAN

A

b) WAN

30
Q

Which type of network has ranges of only thirty feet or less, but is sufficient for an individual to interconnect his personal computing devices?

a) PAN
b) LAN
c) WAN
d) CAN

A

a) PAN

31
Q

How might a LAN be designed in a business setting to minimize extraneous traffic where possible?

a) Create separate LANs for each floor.
b) Create separate LANs for each manager.
c) Create separate LANs for each department.
d) Create separate LANs for each district or territory.

A

c) Create separate LANs for each department.

32
Q

What makes virtual circuits more efficient in the use of transmission resources than traditional circuit switching?

a) Links and intermediate nodes are shared with other connections.
b) A virtual circuit uses multiple links to send data over possibly different channel paths.
c) There is a dedicated path for the exclusive use of the sender-receiver pair for the entire time of the connection.
d) There is a virtual path for the exclusive use of the sender-receiver pair for the entire time of the connection.

A

a) Links and intermediate nodes are shared with other connections.

33
Q

Which of the following is not true about datagram switching?

a) TCP/IP rarely uses datagram switching.
b) Each packet is routed from node to node independently.
c) A routing decision can be based on shortest path to next node.
d) A routing decision can be based on traffic conditions at the time of packet arrival.

A

a) TCP/IP rarely uses datagram switching.

34
Q

How do routers and gateways differ?

a) Routers are used in ISPs; gateways are used in WANs.
b) There are no differences between routers and gateways.
c) Routers interconnect dissimilar networks together; gateways connect similar networks.
d) Routers connect similar networks together; gateways interconnect dissimilar networks.

A

d) Routers connect similar networks together; gateways interconnect dissimilar networks.

35
Q

Which of the following is not a major organization that participates in the creation of standards for data communications, networks, and internetworks?

a) Internet Engineering Task Force (IETF)
b) Association for Computing Machinery (ACM)
c) International Organization for Standardization (ISO)
d) International Telecommunications Union Telecommunications Group (ITU-T)

A

b) Association for Computing Machinery (ACM)