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Chapter 1
The correct answer for each question is indicated by a .
1 CORRECT
In a _______ connection, more than two devices can share a
single link.
A) Point-to-point
B) Primary
C) Multipoint
D) Secondary
2 CORRECT
Communication between a computer and a keyboard involves
______________ transmission.
A) Full-duplex
B) Half-duplex
C) Simplex
D) Automatic
3 CORRECT
In a network with 25 computers, which topology would require
the most extensive cabling?
A) Star
B) Mesh
C) Bus
D) Ring
4 CORRECT
Which topology requires a central controller or hub?
A) Star
B) Mesh
C) Bus
D) Ring
5 INCORRECT
The _______ is the physical path over which a message
travels.
A) Protocol
B) Medium
C) Signal
D) All the above
6 INCORRECT
Which organization has authority over interstate and
international commerce in the communications field?
A) ITU-T
B) IEEE
C) ISO
D) FCC
7 CORRECT
The information to be communicated in a data communications
system is the _______.
A) Medium
B) Protocol
C) Transmission
D) Message
8 INCORRECT
Frequency of failure and network recovery time after a
failure are measures of the _______ of a network.
A) Performance
B) Security
C) Reliability
D) Feasibility
9 CORRECT
In _______ transmission, the channel capacity is shared by
both communicating devices at all times.
A) Full-duplex
B) Simplex
C) Half-duplex
D) Half-simplex
10 CORRECT
An unauthorized user is a network _______ issue.
A) Performance
B) Reliability
C) Security
D) All the above
11 INCORRECT
Which topology requires a multipoint connection?
A) Mesh
B) Star
C) Ring
D) Bus
12 CORRECT
A television broadcast is an example of _______
transmission.
A) Half-duplex
B) Full-duplex
C) Simplex
D) Automatic
13 CORRECT
A _______ connection provides a dedicated link between two
devices.
A) Multipoint
B) Point-to-point
C) Primary
D) Secondary
14 CORRECT
A cable break in a _______ topology stops all transmission.
A) Mesh
B) Star
C) Primary
D) Bus
________________________________________
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Chapter 2
The correct answer for each question is indicated by a .
1 INCORRECT
The _______ layer changes bits into electromagnetic signals.
A) Physical
B) Transport
C) None of the
above
D) Data link
2 CORRECT
The physical layer is concerned with the transmission of
_______ over the physical medium.
A) Programs
B) Protocols
C) Bits
D) Dialogs
3 CORRECT
Mail services are available to network users through the
_______ layer.
A) Data link
B) Physical
C) Application
D) Transport
4 CORRECT
As the data packet moves from the lower to the upper layers,
headers are _______.
A) Added
B) Rearranged
C) Modified
D) Subtracted
5 CORRECT
As the data packet moves from the upper to the lower layers,
headers are _______.
A) Removed
B) Added
C) Rearranged
D) Modified
6 INCORRECT
The _______ layer lies between the network layer and the
application layer.
A) Data link
B) Physical
C) Transport
D) None of the
above
7 INCORRECT
Layer 2 lies between the physical layer and the _______
layer.
A) Data link
B) Network
C) Transport
D) None of the
above
8 INCORRECT
When data are transmitted from device A to device B, the
header from A's layer 4 is read by B's _______ layer.
A) Application
B) Physical
C) Transport
D) None of the
above
9 INCORRECT
Which layer functions as a liaison between user support
layers and network support layers?
A) Network layer
B) Transport
layer
C) Physical
layer
D) Application
layer
10 CORRECT
What is the main function of the transport layer?
A) Process-to-process
delivery
B) Node-to-node
delivery
C) Synchronization
D) Updating and
maintenance of routing tables
11 CORRECT
Which of the following is an application layer service?
A) Remote log-in
B) File transfer
and access
C) Mail service
D) All the above
12 INCORRECT
The Internet model consists of _______ layers.
A) Three
B) Five
C) Seven
D) Eight
13 CORRECT
The process-to-process delivery of the entire message is the
responsibility of the _______ layer.
A) Physical
B) Network
C) Transport
D) Application
14 CORRECT
The _______ layer is the layer closest to the transmission
medium.
A) Network
B) Physical
C) Data link
D) Transport
________________________________________
///////////////////////////////////////////////////////////
Chapter 7
The correct answer for each question is indicated by a .
1 INCORRECT
The VLF and LF bands use _______ propagation for
communications.
A) Space
B) Ground
C) Sky
D) Line of sight
2 CORRECT
Category 1 UTP cable is most often used in _______ networks.
A) Infrared
B) Telephone
C) Fast Ethernet
D) Traditional
Ethernet
3 CORRECT
BNC connectors are used by _______ cables.
A) Fiber-optic
B) UTP
C) STP
D) Coaxial
4 CORRECT
Which of the following is not a guided medium?
A) Twisted-pair
cable
B) Fiber-optic
cable
C) Atmosphere
D) Coaxial cable
5 CORRECT
In an environment with many high-voltage devices, the best
transmission medium would be _________.
A) Twisted-pair
cable
B) Coaxial cable
C) The
atmosphere
D) Optical fiber
6 CORRECT
_______ cable consists of an inner copper core and a second
conducting outer sheath.
A) Coaxial
B) Twisted-pair
C) Fiber-optic
D) Shielded
twisted-pair
7 CORRECT
In fiber optics, the signal source is _______ waves.
A) Very
low-frequency
B) Light
C) Radio
D) Infrared
8 CORRECT
Smoke signals are an example of communication through
_______.
A) A guided
medium
B) A refractive
medium
C) An unguided
medium
D) A small or
large medium
9 CORRECT
Which of the following primarily uses guided media?
A) Cellular
telephone system
B) Satellite
communications
C) Local
telephone system
D) Radio
broadcasting
10 INCORRECT
What is the major factor that makes coaxial cable less
susceptible to noise than twisted-pair cable?
A) Outer
conductor
B) Inner
conductor
C) Diameter of
cable
D) Insulating
material
11 INCORRECT
The RG number gives us information about _______.
A) Optical
fibers
B) Twisted pairs
C) Coaxial
cables
D) All the above
12 CORRECT
Transmission media are usually categorized as _______.
A) Guided or
unguided
B) Fixed or
unfixed
C) Determinate
or indeterminate
D) Metallic or
nonmetallic
13 INCORRECT
The _______ is an association that sponsors the use of
infrared waves.
A) EIA
B) IrDA
C) FCC
D) PUD
14 CORRECT
In an optical fiber, the inner core is _______ the cladding.
A) Less dense
than
B) Denser than
C) The same
density as
D) Another name
for
15 INCORRECT
The inner core of an optical fiber is _______ in
composition.
A) Copper
B) Bimetallic
C) Glass or
plastic
D) Liquid
16 CORRECT
When a beam of light travels through media of two different
densities, if the angle of incidence is greater than the critical angle,
_______ occurs.
A) Refraction
B) Reflection
C) Incidence
D) Criticism
17 CORRECT
In _______ propagation, the beam of propagated light is
almost horizontal, and the low-density core has a small diameter compared to
the cores of the other propagation modes.
A) Single-mode
B) Multimode
step-index
C) Multimode
graded-index
D) Multimode
single-index
18 CORRECT
_______ is the propagation method subject to the greatest
distortion.
A) Single-mode
B) Multimode
step-index
C) Multimode
graded-index
D) Multimode
single-index
19 CORRECT
In _______ propagation, the core is of varying densities.
A) Single-mode
B) Multimode
step-index
C) Multimode
graded-index
D) Multimode
single-index
20 INCORRECT
When we talk about unguided media, usually we are referring
to _______.
A) Metallic
wires
B) Nonmetallic
wires
C) The air
D) None of the
above
21 CORRECT
Transmission media are closest to the _______ layer.
A) Application
B) Physical
C) Network
D) Transport
22 CORRECT
Radio wave and microwave frequencies range from _______.
A) 3 to 300 KHz
B) 300 KHz to 3
GHz
C) 3 KHz to 300
GHz
D) 3 KHz to 3000
GHz
23 CORRECT
Optical fibers, unlike wire media, are highly resistant to
_______.
A) High-frequency
transmission
B) Low-frequency
transmission
C) Refraction
D) Electromagnetic
interference
24 CORRECT
In _______ propagation, low-frequency radio waves hug the
earth.
A) Space
B) Ground
C) Sky
D) Line of sight
25 CORRECT
When the angle of incidence is _______ the critical angle,
the light beam bends along the interface.
A) More than
B) Less than
C) Equal to
D) None of the
above
26 INCORRECT
A parabolic dish antenna is a(n) _______ antenna.
A) Omnidirectional
B) Bidirectional
C) Horn
D) Unidirectional
________________________________________
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Chapter 19
On a
network that uses NAT, the _______ has a translation table.
A) Router
B) Switch
C) Server
D) None of the
above
2 INCORRECT
Identify the class of IP address 229.1.2.3.
A) Class A
B) Class B
C) Class C
D) Class D
3 INCORRECT
On a network that uses NAT, _______ initiates the
communication.
A) An internal
host
B) An external
host
C) The router
D) (a) or (b)
4 CORRECT
A subnet mask in class B can have _______ 1s with the
remaining bits 0s.
A) Nine
B) Seventeen
C) Three
D) Fourteen
5 INCORRECT
A subnet mask in class C can have _______ 1s with the
remaining bits 0s.
A) Twenty-five
B) Twelve
C) Seven
D) Ten
6 CORRECT
Identify the class of IP address 4.5.6.7.
A) Class A
B) Class B
C) Class C
D) Class D
7 CORRECT
Identify the class of IP address 191.1.2.3.
A) Class A
B) Class B
C) Class C
D) Class D
8 INCORRECT
A subnet mask in class A can have _______ 1s with the
remaining bits 0s.
A) Nine
B) Four
C) Thirty-three
D) Three
9 INCORRECT
Class _______ has the greatest number of hosts per given
network address.
A) A
B) B
C) C
D) D
10 INCORRECT
A subnet mask in class B has nineteen 1s. How many subnets
does it define?
A) 128
B) 8
C) 32
D) 64
11 INCORRECT
In _______ routing, the full IP address of a destination is
given in the routing table.
A) Next-hop
B) Host-specific
C) Network-specific
D) Default
12 CORRECT
A subnet mask in class C has twenty-five 1s. How many
subnets does it define?
A) 0
B) 2
C) 8
D) 16
13 INCORRECT
Given the IP address 180.25.21.172 and the subnet mask
255.255.192.0, what is the subnet address?
A) 180.25.21.0
B) 180.25.8.0
C) 180.25.0.0
D) 180.0.0.0
14 INCORRECT
Given the IP address 18.250.31.14 and the subnet mask
255.240.0.0, what is the subnet address?
A) 18.9.0.14
B) 18.0.0.14
C) 18.31.0.14
D) 18.240.0.0
15 INCORRECT
_______ is a client-server program that provides an IP
address, subnet mask, IP address of a router, and IP address of a name server
to a computer.
A) NAT
B) DHCP
C) CIDR
D) ISP
16 INCORRECT
In _______, each packet of a message need not follow the
same path from sender to receiver.
A) The virtual
approach to packet switching
B) The datagram
approach to packet switching
C) Message
switching
D) None of the
above
17 CORRECT
An IP address consists of _______ bits.
A) 8
B) 32
C) 4
D) Any of the
above
18 INCORRECT
On a network that uses NAT, the router can use _______
global address(es).
A) A pool of
B) One
C) Two
D) None of the
above
19 CORRECT
In _______ routing, the mask and destination addresses are
both 0.0.0.0 in the routing table.
A) Default
B) Next-hop
C) Network-specific
D) Host-specific
20 INCORRECT
A subnet mask in class A has fourteen 1s. How many subnets
does it define?
A) 64
B) 128
C) 32
D) 8
21 CORRECT
In which type of switching do all the packets of a message
follow the same channels of a path?
A) Virtual
circuit packet switching
B) Message
switching
C) Datagram
packet switching
D) None of the
above
22 INCORRECT
In _______ routing, the destination address is a network
address in the routing table.
A) Network-specific
B) Host-specific
C) Next-hop
D) Default
23 INCORRECT
Given the IP address 201.14.78.65 and the subnet mask
255.255.255.224, what is the subnet address?
A) 201.14.78.64
B) 201.14.78.32
C) 201.14.78.65
D) 201.14.78.12
