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Chapter 6 – Local Area Networks
Dr. Hussein Al-Bahadili
Chapter 6
Local Area Networks
True-False Questions
The following are possible True/False questions for tests. The statement is given and the answer
is provided . The level of difficulty (easy, moderate, difficult) and the page number(s) relevant to
the topic are also furnished.
1.
As discussed in this textbook, three layers of a network model are required for a typical
network, including local area networks.
2.
Difficulty:
Moderate
p.198
Traditional Ethernet and switched Ethernet account for almost 95 percent of all LANs
installed today.
3.
Difficulty:
Easy
p. 199
Resource sharing refers to having users access the same data files, exchange information via
e-mail, or use the Internet.
4.
Difficulty:
Easy
p. 199
On a network, it is always legal to purchase one copy of software, such as a word processing
package, that multiple users use simultaneously.
5.
Difficulty:
Easy
p. 200
LAN metering software can be used to prohibit using more copies of a package than there are
installed licenses.
6.
Difficulty: Easy
p. 200
Software Publishers Association has embarked upon an aggressive software audit program to
check the number of illegal software copies on LANs.
7.
Difficulty:
Easy
p. 200
LANs can be categorized as either dedicated (with a dedicated server) or peer-to-peer
(without a dedicated server).
8.
9.
10.
Difficulty:
Easy
p. 200
Peer-to-peer networks have computers that are permanently assigned as network servers
Difficulty:
Easy
p. 201
A Network Operating System (NOS), such as Novell or Windows NT, must be used in
addition to the ‘normal’ operating system, such as Windows, on a server in a dedicated server
LAN.
Difficulty:
Easy
p. 201
By offloading printing tasks from the main LAN server, a print server increases network
efficiency.
Difficulty: Moderate
p. 201
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
11.
12.
Dr. Hussein Al-Bahadili
The Network Interface Card (NIC) permits a computer to be physically connected to a
network’s cable, which provides the network layer connection among the computers in the
network.
Difficulty:
Moderate
p. 202
Some computers have a special port that enables network cards to be installed without
physically opening them (PCMCIA slots).
13.
Difficulty:
Easy
p. 202
LANs that run on infrared or radio frequencies use a type of conducted media.
14.
Difficulty:
Easy
p. 203
Fiber optic cable is thicker and heavier than unshielded twisted pair.
Difficulty:
15.
Easy
p. 203
Many network hubs incorporate repeaters or amplifiers to regenerate signals so that
attenuation of the signal does not occur
16.
Difficulty:
Moderate
p. 204
The NOS software for the server computer provides the physical, data link, and network
layer functions.
17.
Difficulty:
Moderate
p. 206
One of the most important functions of Network Operating System (NOS) is a directory
service.
18.
Difficulty: Easy
p. 207
LDAP is an industry standard directory protocol.
19.
Difficulty:
Easy
p. 208
A hardware device that is not included in a network profile cannot be accessed by another
computer on the network.
20.
Difficulty: Easy
p. 209
User profile refers to what resources on each server are available on the network for use by
other computers and which devices or people are allowed access on the network.
21.
Difficulty: Moderate
Traditional Ethernet is also known as shared Ethernet.
22.
Difficulty: Easy
p. 209
Ethernet is a layer 3 protocol, which operates at the network layer.
23.
Difficulty: Easy
p. 209
The Ethernet standard was developed first by the IEEE.
Difficulty: Moderate
p. 209
p. 209
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
24.
25.
Dr. Hussein Al-Bahadili
Topology refers to the geometric layout of the network and describes how the computers are
interconnected..
Difficulty: Easy
p. 209
A collision on a bus circuit means that two computers on that circuit have transmitted at the
same time.
Difficulty: Moderate
p. 211
26.
The three latest versions of Ethernet run at speeds of 1Gbps, 10Gbps, and 50 Gbps.
27.
Difficulty: Easy
p.212
1000Base-LX is a version of 1000Base-T than runs on four pairs of CAT 5 cable.
28.
Difficulty: Easy
p. 212
A workgroup switch is designed to work on the Backbone Network (BN).
29.
30.
31.
32.
33.
34.
Difficulty: Easy
p. 214
A switch broadcasts all the packets it receives to all the computers that are connected to the
switch.
Difficulty: Easy
p. 214
A switch-forwarding table tells a switch which port it should send out a packet to get to the
destination computer.
Difficulty: Moderate
p. 214
When a switch receives a packet with a destination address that is not in its forwarding table,
the switch will broadcast the packet to all of its ports.
Difficulty: Easy
p. 214
Cut through switching has fewer errors than store and forward switching.
Difficulty: Easy
p. 215
Store and forward switching cannot be used unless incoming and outgoing data circuit has
the same data rate.
Difficulty: Easy
p. 215
A switch can send and receive on all circuits simultaneously.
Difficulty: Easy
p. 214
MULTIPLE CHOICE
The following are possible multiple-choice questions for tests. The question is posed and the
answer is provided under the choices. The level of difficulty (easy, moderate, difficult) and the
page number(s) relevant to the topic is also furnished.
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
1.
2.
3.
4.
5.
Dr. Hussein Al-Bahadili
_____________ refers to having users who access the same data files, exchange information
via electronic mail, or search the Internet for information.
a. Resource sharing
b. User grouping
c. User profiling
d. Information sharing
e. Data pirating
Difficulty: Easy
p. 199
____________ refers to one computer legally sharing a software package, such as Microsoft
Word, with other computers on the network to save costs.
a. Software metering
b. Information sharing
c. Resource sharing
d. Software pirating
e. Network routing
Difficulty: Easy
p. 199
A dedicated server LAN:
a. can only use simple LAN software
b. is limited to handling small databases
c. has one or more permanently assigned servers that can enable users to share files, for
example
d. can not connect with other networks
e. is limited to handling small files
Difficulty: Moderate
p. 200
Which of the following is not a critical software component in a dedicated server LAN?
a. application software on server computers
b. network operating system in the dedicated server
c. network communication software on the client
d. LAN metering software
e. application software on client computers
Difficulty: Moderate
p. 200
A(n) _____________ is not a common type of dedicated server.
a. file server
b. print server
c. database server
d. collision server
e. remote access server
Difficulty: Moderate
p. 201
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
6.
7.
8.
9.
10.
11.
Dr. Hussein Al-Bahadili
A(n) ____________ can permit users calling into a LAN remotely to retrieve their email, for
example.
a. print server
b. database server
c. file server
d. piconet server
e. remote access server
Difficulty: Moderate
p. 201
A peer-to-peer LAN:
a. has more capability than a dedicated server
b. supports a higher number of computers than a dedicated server
c. is generally cheaper in hardware and software than a dedicated server
d. is not appropriate for sharing resources in a small LAN
e. is often much faster than dedicated server networks
Difficulty: Moderate
Which of the following is not a basic LAN component?
a. client
b. PAD
c. server
d. network interface card
e. network operating system
201
Difficulty: Easy
p. 202-203
Which of the following is not an advantage of using Cat5 unshielded twisted pair for cabling
LANs?
a. cost (relative to fiber)
b. thickness (relative to coax)
c. weight (relative to coax)
d. flexibility (relative to coax)
e. security (relative to fiber)
Difficulty: Moderate
p. 203
Of the following, which is not true about fiber optic cable?
a. it is thinner than unshielded twisted pair cable
b. it is lighter than unshielded twisted pair cable
c. it has a very low capacity
d. it is more expensive than CAT5 unshielded twisted pair cable
e. it is a type of guided media
Difficulty: Moderate
p. 203
Which of the following is not a purpose for using hubs in a network?
a. to act as a communications server
b. to connect network cables
c. to prevent attenuation
d. to act as a junction box
e. none of the above
Difficulty: Moderate
p. 203-204
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
Dr. Hussein Al-Bahadili
12.
Which of the following type of media is most commonly used in backbone networks because
of its high capacity?
a. fiber
b. infrared frequencies
c. coax cable
d. unshielded twisted pair
e. shielded twisted pair
13.
Hubs:
a.
b.
c.
d.
e.
Difficulty: Easy
14.
15.
16.
p. 203
usually incorporate repeaters or amplifiers
have connection points called handles
limit the distance of a network to a few meters in length
are a difficult method to connect network cables
operate at the application layer
Difficulty: Moderate
p. 204
__________ is not true with respect to network hubs.
a. Each port in a hub has a unique number.
b. A good network plan includes hubs in areas, such as a telecommunications wiring
closet, in which a network may expand
c. Simple hubs are commonly available in 4-, 8-, 16-, and 24-port sizes
d. Many hubs act as repeaters or amplifiers
e. Hubs provide a complicated way to connect network cables
Difficulty: Moderate
_____________ is the software that controls the network.
a. Network Operating System
b. Client Operating System
c. Embedded Operating System
d. Network Control System
e. Network Software System
p. 203
Difficulty: Moderate
p. 206
The server version of the Network Operating System does not:
a. provide the software that performs the functions associated with the physical layer
b. provide the software that performs the functions associated with the data link layer
c. provide the software that performs the functions associated with the application layer
d. provide the software that performs the functions associated with the network layer
e. usually provide the software that performs the functions associated with the
computer’s own operating system
Difficulty: Moderate
p. 206
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
17.
18.
19.
20.
21.
Dr. Hussein Al-Bahadili
_____________ provide information about resources on the network that are available to the
users, such as shared printers, file servers and application software.
a. Network Services
b. Directory Services
c. Client Services
d. Computing Services
e. Remote Access Services
Difficulty: Moderate
A _________ is a group of related resources.
a. workgroup
b. domain
c. server
d. client
e. sharepoint
p. 206
Difficulty: Moderate
p. 208
A hierarchical tree of domains within one organization that are linked to other trees in the
organization is called a ___________.
a. ADS
b. domain
c. forest
d. tree
e. NDS
Difficulty: Moderate
p. 208
A __________ indicates what resources on each server are available on the network for use
by other computers and what people are allowed what access to the network.
a. user profile
b. user access log
c. network profile
d. network operating system
e. server allocation list
Difficulty: Easy
p. 208-209
The cheapest time to install network cabling is:
a. during the construction of the building
b. as soon as the building is completed
c. as soon as the building is occupied
d. about five years after the building is occupied so that the exact office locations for
each network computer is known
e. any time that a network needs to be installed
Difficulty: Moderate
p. 205
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
22.
23.
24.
25.
26.
27.
Dr. Hussein Al-Bahadili
Ethernet LAN was developed by:
a. IBM
b. ARPANET
c. DEC, Xerox, and Intel
d. University of Minnesota
e. CERN laboratory in Geneva
Difficulty: Easy
___________ is how the network works conceptually.
a. Physical topology
b. Logical topology
c. Network topology
d. Ethernet
e. Media access control
p. 209
Difficulty: Easy
The type of logical topology that Ethernet uses is a:
a. ring
b. bus
c. star
d. mesh
e. interconnected
p. 209
Difficulty: Easy
p. 209
A logical bus topology:
a. is always used by token ring protocol LANs
b. has all computers connected to each other in point-to-point connections
c. is limited to short distances since devices like a hub or repeater cannot be used
with this type of topology
d. permits every message to be received by every computer on the bus, even when
those messages are intended for other computers
e. has a central control device, such as a mainframe
Difficulty: Moderate
p. 197
Media access control refers to:
a. the price of fiber optic cable
b. security over floppy disks in a user environment
c. the ability for a user to use multimedia equipment in a LAN
d. controlling access to a media by more than one computer in a LAN
e. the control over coax cable installed by a cable service provider
Difficulty: Moderate
p. 210
Which of the following is not true about CSMA/CD?
a. The acronym refers to Carrier Sense Multiple Access with Collision Detection
b. It is used in token ring protocol LANs
c. It is a contention-based media access control technique
d. When a collision has occurred, the computers that wish to transmit wait a random
amount of time after a colliding message before attempting to retransmit
e. Computers on the circuit ‘listen’ while transmitting
Difficulty: Moderate
p. 211
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
28.
29.
Dr. Hussein Al-Bahadili
_________ is not a type of Ethernet specification.
a. 100Base-T
b. 10GbE
c. 1000Base-T (1GbE)
d. 10Base-T
e. Securenet
Difficulty: Moderate
10Base-5:
a. supports 10 Mbps data rate
b. was the original Ethernet specification
c. is known as Thicknet
d. is capable of running 500 meters between hubs
e. all of the above
Difficulty: Moderate
30.
31.
32.
p. 212
p. 212
1000 Base-T:
a. can run at either full- or half-duplex
b. is one of the oldest forms of Ethernet
c. is one of the slowest forms of Ethernet
d. can only be used over coaxial cables
e. has only one version, 1000Base-SLCX
Difficulty: Moderate
p. 211-212
________ is a hybrid version of Ethernet that uses either 10Base-T or 100Base-T.
a. Mullion Ethernet
b. Base-T Ethernet
c. 10/100 Ethernet
d. Token ring Ethernet
e. FDDI Ethernet
Difficulty: Easy
p. 213
10/100 Ethernet:
a. uses 100 Mbps throughout the entire network
b. is not useful in the short run for organizations that are uncertain about which
Ethernet standard to use
c. uses 10 Mbps throughout 100% of the entire network
d. provides traditional 10 Mbps Ethernet connections to client computers utilizing
traditional 10Base-T, with 100 Mbps generally used to the server
e. uses 10 Gbps throughout 100% of the entire network
Difficulty: Moderate
213
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
33.
34.
35.
36.
37.
Dr. Hussein Al-Bahadili
Which of the following is not true about 10/100 Ethernet?
a. It is not a hybrid type of Ethernet.
b. It provides flexibility for organizations that want to use both the 10Base-T and
100Base-T standards at the same time.
c. 10/100 autosense hubs (and/or switches) are able to detect the signal transmitted by
the client’s NIC and use 10 Mbps or 100 Mbps, depending on what the client uses.
d. Depending upon how it is configured, a 10/100 Ethernet NIC can run at either 10
Mbps or at 100 Mbps.
e. It provides flexibility for organizations that are uncertain about which Ethernet
standard to use in the short term.
Difficulty: Easy
p. 213
Switched Ethernet:
a. uses a hub to connect computers
b. has a physical topology of a ring
c. has a logical topology of a ring
d. has a logical topology of a bus
e. usually enables all attached circuits to send or receive packets simultaneously
Difficulty: Moderate
p. 213
A switch uses a _____________ that is very similar to a routing table used in a router.
a. cable plan
b. forwarding table
c. network server
d. reversing table
e. switching mullion
Difficulty: Easy
p. 214
Which of the following is not true about layer-2 switched Ethernet?
a. A switch replaces the hub.
b. The physical topology is the same as the physical topology of shared Ethernet: a
ring.
c. The logical topology is a star.
d. The switch uses a forwarding table to route the packet to the correct
circuit/computer.
e. The switch chooses which packet to transmit first if it receives more than one packet
destined for the same computer at the same time, and stores the other packet(s)
temporarily.
Difficulty: Moderate
p. 214
Switched Ethernet:
a. always has a lower capacity than shared Ethernet.
b. operates at 50% of capacity before performance becomes a problem.
c. operates at about 95% of capacity before performance becomes a problem.
d. is affected by the increased collisions caused by using a switched LAN design.
e. decreases network performance because each computer is connected via a common
multipoint circuit.
Difficulty: Moderate
p. 219
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
38.
39.
40.
41.
42.
Which of the following is not true about switched Ethernet?
a. The probability of collision is higher than with shared Ethernet.
b. It uses a switch instead of a hub.
c. It has faster connections (almost immediate) than traditional Ethernet.
d. It essentially provides a point-to-point connection between computers.
e. It has forwarding tables in which entries are learned over time.
Difficulty: Moderate
p. 214-215
Which of the following is a mode in which a switch operates:
a. fast learning switching
b. routing switching
c. fragment free switching
d. store switching
e. cut switching
Difficulty: Moderate
p. 215
Each of the circuits connected to a switch is a separate _______________ circuit connecting
the switch to a device on the network.
a. multipoint
b. point-to-point
c. shared
d. ring
e. star
Difficulty: Easy
p. 215
Traditional 10Base-T LANs can run effectively at about _________ percent.
a. 60
b. 50
c. 80
d. 95
e. 70
Difficulty: Moderate
p. 216
On a 10Base-T switched network with 10 computers, we could get a network capacity of:
a.
b.
c.
d.
e.
43.
Dr. Hussein Al-Bahadili
60 Mbps
50 Mbps
80 Mbps
95 Mbps
70 Mbps
Difficulty: Moderate
p. 216
__________ is the maximum practical speed in bits that the hardware layers can be expected
to provide
a. Effective access time
b. Effective data rate
c. Latency
d. Network speed
e. Propagation delay
Difficulty: Easy
p. 217
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
44.
45.
46.
47.
48.
49.
Dr. Hussein Al-Bahadili
LAN bottlenecks are usually found at the:
a. data entry keyboard and client video monitors
b. LAN server and network circuit
c. hub repeaters and transducer circuit modules
d. client operating system and diskette drive
e. client hard drive and processor
Difficulty: Easy
p. 221
Which of the following can provide fault tolerance for the storage space on a server?
a. RAID
b. SCSI
c. IDE
d. USB
e. EIDE
Difficulty: Easy
p. 223
Which of the following is not a potential bottleneck for LAN performance?
a. number and speed of hard disks in the server
b. amount of memory in the server
c. speed of server’s CPU
d. network interface card
e. all of the above are potential bottlenecks for LAN performance
Difficulty: Moderate
221-225
If your LAN server is overloaded, which of the following should you not consider (to solve
the server problem)?
a. adding one or more additional servers
b. upgrading the server’s CPU with a faster CPU
c. increasing the amount of memory of the server
d. increasing the number and speed of hard disks in the server
e. replacing the cable with fiber optic cable
Difficulty: Moderate
pp. 222-223
To increase the volume of simultaneous messages the LAN circuit can transmit from network
clients to the server(s), you can:
a. increase the CPU of the server
b. upgrade to a bigger circuit
c. increase the number of hard disks on the server
d. increase the amount of disk capacity of the server
e. increase the amount of memory of the server
Difficulty: Easy
Breaking a network into smaller parts is called network:
a. fragmentation
b. segmentation
c. localization
d. allocation
e. mitigation
Difficulty: Easy
pp. 210-211
p. 224
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
50.
Dr. Hussein Al-Bahadili
Which of the following is not an effective way to reduce LAN network demand:
a. move files to client computers
b. use disk caching on the client machines
c. find an application that places a large demand on the network and run it a time when
the network is lightly loaded
d. add hidden nodes
e. shift the users’ routines
Difficulty: Moderate
p. 224-225
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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Chapter 6 – Local Area Networks
Dr. Hussein Al-Bahadili
Short Answer and Essay Questions:
1. What does a NOS do? What are the major software parts of a NOS? What is the
most important characteristic of a NOS? What are two NOS product names?
2. Describe CSMA, CD and CA. How does this work, in essence? Compare this to
wireless LANS? How are they similar, and how are they different in terms of
MAC?
3. What is the difference between a peer to peer and dedicated server LAN?
4. Give five types of dedicated servers.
5. What are two other names for NIC cards?
6. Describe in detail the difference between a hub and a switch in a LAN. Draw a
diagram of each, and then mark it to show some of the points that you have made
in your discussion of the differences. Discuss the difference between shared
Ethernet and switched Ethernet in light of your answer.
7. Define 802.3, 802.11b, 802.11a, 802.11g, 802.15. Draw a chart with rows for
each of these technologies. Fill out the chart with columns that include “common
name for standard,” “typical uses for standard,” “schematic of physical network,”
(ie, draw a tiny picture of an 802.3 network, etc.), “media,” “MAC,” “speeds of
network,” “example of type of application.” When might you prefer to use
switched Ethernet over wireless LANs? When is a wireless LAN preferable for
your applications?
8. What are four parts of a NOS? What is the network profile, what is the user
profile?
9. Given a specific description of an Ethernet type, be prepared to answer questions
regarding its speed, type of transmission and physical structure, e.g., 100BaseT,
etc.
10. Define the three modes of switch operations.
11. What is the best practice Ethernet at the present time? Describe, and explain why
this is best practice. What is the best practice wireless at the present time?
Describe and explain why this is best practice. Would you install a wired or
wireless Ethernet right now? Describe, if you were a manager, what your
network of choice would be and why.
12. Discuss in detail how you would improve a LAN network’s performance, and
what you would look for (see Figure 6-11 for input).
J. FitzGerald and A. Dennis. Business Data Communications and Networking, John Wiley & Sons, Inc., 9th Edition 2006.
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