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Transmission is generally in the form of frames when using a ring topology.
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Effective and efficient data communication and networking facilities are vital to any
enterprise.
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FTP provides a basic electronic mail transport facility.
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Rapid Ethernet refers to a set of specifications developed by the IEEE 802.3 committee
to provide a low-cost, Ethernet-compatible LAN operating at 100 Mbps and utilizing
10BASE-T.
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Elaborate algorithms are used to cope with the time delay and overhead penalties of
network operation in a packet switching network.
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Data communications deals with the transmission of signals in a reliable and efficient
manner.
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When only analog transmission facilities are available, modulation is required to
convert the digital data to analog form.
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OFDM LANs typically operate in either the 2.4-GHz band or the 5-GHz band.
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The long distance carrier system provided in the US and throughout the world was
designed to transmit voice signals over high capacity transmission links such as optical
fiber, coaxial cable, and microwave.
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Generally there is only one possible route connecting a source to a destination.
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The beginning and end of each frame must be recognizable for effective communication
between two directly connected transmitting-receiving stations.
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The key elements of the local area network determine the cost and capacity of the LAN,
the type of data that may be transmitted, the speed and efficiency of communications,
and the kinds of applications that can be supported.
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Both analog and digital information can be encoded as either analog or digital signals.
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MPLS is an enhancement that does not require an upgrade to IP routers to support its
features.
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DLHC is a widely used data link control.
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Unshielded twisted pair provides better performance at higher data rates.
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A property of flooding is all nodes that are directly or indirectly connected to the source
node are visited.
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Error control enables a receiver to regulate the flow of data so that the receiver's buffers
do not overflow.
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A major problem in designing a communications facility is transmission impairment.
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Node-node links are usually multiplexed using either frequency division multiplexing
or time division multiplexing.
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The spectrum of the AM signal consists of the original carrier plus the spectrum of the
input signal translated to fc.
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Traffic policing is concerned with traffic leaving the switch.
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The increasing use of optical fiber, while greatly increasing capacity, has caused an
increase in transmission prices as well.
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For any given medium, the greater the bandwidth transmitted, the greater the cost.
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The sliding-window technique would work well with a reliable network service.
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Typically two communicating stations will not utilize the full capacity of a data link.
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The LFSR implementation of a cyclic error-correcting encoder is the same as that of the
CRC error-detecting code.
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For services such as voice and video that require a network with high predictability, the
DS and IS approaches, by themselves, may prove inadequate on a heavily loaded
network.
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Circuit switching connections do not appear to attached devices as direct connections.
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The same antenna cannot be used for both transmission and reception in two way
communication.
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Modulo 2 arithmetic uses binary addition with no carries, which is just the
exclusive-OR (XOR) operation.
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The author MUA processes receive mail for storage and/or display to the recipient user.
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It is not necessary for a device to interface with the transmission system in order to
communicate.
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Congestion control on the basis of implicit signaling requires action on the part of
network nodes.
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In multicasting only a single copy of the packet is ever transmitted.
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The IEEE 802.11 physical layer covers a limited range of data rates.
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Even if all sources can detect congestion and reduce flow on the basis of congestion,
network congestion still will not be relieved.
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The true potential of optical fiber is fully exploited when multiple beams of light at
different frequencies are transmitted on the same fiber.
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There is no need for connection establishment and termination procedures to support
connection-oriented service with a reliable network service.
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Developing switching systems with the capacity and rapid response to support the
demand requirements with the increased use of fiber optic transmission is no longer a
challenge.
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________ involves moving voice into a data infrastructure, integrating all the voice and
data networks inside a user organization into a single data network infrastructure, and
then extending that into the wireless arena.
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________ provides a means of informing the destination TCP user that significant data
is in the upcoming data stream. It is up to the destination user to determine appropriate
action.
A) Data stream signaling
B) Attention signaling
C) Urgent data signaling
D) Alert signaling
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The ________ variable represents a particular TS user at the specified host.
A) Port
B) Host
C) Socket
D) Transport
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A network in which small chunks of data are passed through the network from node to
node, and at each node the entire data chunk is received, stored briefly, and then
transmitted to the next node, is a ________ network.
A) packet switching
B) ATM
C) circuit switching
D) frame relay
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An LDPC construction technique that results in a systematic code is called a
__________ code.
A) Tanner
B) irregular LDPC
C) regular LDPC
D) repeat-accumulate
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The use of coding allows a reduction, referred to as the ________, and defined as the
reduction in decibels to achieve a specified BER of an error correcting coded system
compared to an uncoded system using the same modulation.
A) code rate
B) fixed coding
C) coding gain
D) block code
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In a ________ network, data entering the network from a station are routed to the
destination by being switched from node to node.
A) communications
B) ATM
C) switched communication
D) packet switching
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The ________ relays mail for one application-level hop.
A) MTA
B) MS
C) POP
D) MSA
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IP attaches a header to upper layer data to form an IP ________.
A) layer
B) packet
C) subnet
D) datagram
Answer:
The ratio of redundant bits to data bits, (n " k)/k , is called the __________ of the code.
A) redundancy
B) coding gain
C) code rate
D) fixed parity
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The magnitude of delay variation is called ________ and is a critical factor in real-time
applications.
A) dropper
B) routing control
C) jitter
D) packet loss
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With ________ flow control the transmission link is treated as a pipeline that may be
filled with frames in transit.
A) linking
B) sliding-window
C) ARQ
D) stop-and-wait
Answer:
A typical coverage area for a wireless LAN has a diameter of ________.
A) 50 to 225 m
B) 25 to 200 m
C) 100 to 300 m
D) 75 to 250 m
Answer:
IGMP _____ allows hosts to specify the list of hosts from which they want to receive
traffic.
A) v1
B) v2
C) v3
D) v4
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The purpose of the ________ mechanism is to gradually expand the window until
acknowledgments are received.
A) slow start
B) window management
C) backpressure
D) none of the above
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The two different types of light source used in fiber optic systems are the ________.
A) single mode and the multimode
B) LID and the DEL
C) TIR and the GIM
D) light-emitting diode and the injection laser diode
Answer:
From the carrier's central office to the customer's site is ________.
A) asymmetric
B) upstream
C) headend
D) downstream
Answer:
_____ real-time applications can tolerate the loss of some portion of the communicated
data.
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The effect of the ________ is to erase the portion of the host field that refers to an
actual host on a subnet, leaving the network number and the subnet number.
A) echo reply
B) checksum
C) subnet mask
D) address mask
Answer:
The ________ specifies the amount by which the data rate can exceed the token rate for
short periods of time.
A) bucket size
B) choke packet
C) reservation
D) exponential average
Answer:
A technique in widespread use in second generation cellular networks is ________.
A) TCMP
B) CDMA
C) 3G
D) HTTP
Answer:
The term ________ refers to the way in which the end points, or stations, attached to
the network are interconnected.
A) control link
B) topology
C) medium
D) medium access link
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________ supplements SMTP and allows the encapsulation of multimedia (nontext)
messages inside of a standard SMTP message.
A) ADMD
B) MIME
C) DNS
D) IMAP
Answer:
________ is the foundation on which all of the internet based protocols and
internetworking is based.
A) Datagram
B) IP
C) TCP
D) VPN
Answer:
The process in which a protocol may need to divide a block received from a higher
layer into multiple blocks of some smaller bounded size is called ________.
A) reassembly
B) subnetting
C) fragmentation
D) downsizing
Answer:
FFT is a family of algorithms that form a special case of the __________ , which refers
to any algorithm that generates a quantized Fourier transform of a time-domain
function.
A) DFT
B) IFT
C) IFFT
D) QPSK
Answer:
The communication of data by the propagation and processing of signals is ________.
A) interlacing
B) transmission
C) signaling
D) effective bandwidth
Answer:
A ________ is a logical subgroup within a LAN that is created by software rather than
physically moving and separating devices.
A) SAN
B) VAN
C) SLAN
D) VLAN
Answer:
The IEEE 802.3 standard allows a maximum of ________ repeaters between any two
stations with the 10BASE5 alternative.
A) two
B) four
C) three
D) five
Answer:
The ________ function attempts to find the least cost route through the network.
A) ABR
B) management
C) generic flow control
D) routing
Answer:
ISA makes use of the following functions to manage congestion and provide
QoS transport: admission control, queuing discipline, discard policy and ________.
Answer:
_________ occurs when the number of packets being transmitted through a network
begins to approach the packet-handling capacity of the network.
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The parameter known as the ________ is the ratio of the amplitude of the input signal
to the carrier.
Answer:
________ is a set of protocols, or protocol suite, designed to address a number
of issues, including traffic engineering, QoS, virtual private networks, and
IP/ATM integration.
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Defined in RFC 821, ______ is the standard protocol for transferring mail between
hosts in the TCP/IP suite.
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__________ is a facility that allows users at workstations and terminals to compose and
exchange messages.
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RTCP receivers provide reception quality feedback using a Sender Report or a
________ Report.
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The act of sending a packet from a source to multiple destinations is referred to as
________.
Answer:
When the system upon which a transport entity is running fails and
subsequently restarts, the state information of all active connections is lost. The
affected connections become ________ because the side that did not fail does not yet
realize the problem.
Answer:
The network consists of a set of ________ joined by point-to-point links in a
closed loop in the ring topology. These are capable of receiving data on one link
and transmitting them, bit by bit, on the other link as fast as they are received.
Answer:
For the lower data rates the ________ MAC protocol is used.
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Most data link control protocols allow a station to cut off the flow of frames from the
other side by sending a ________ message, which acknowledges former frames but
forbids transfer of future frames.
Answer:
MPLS can be used in packet-switching networks.
Answer:
With ________, the outgoing data rate of the multiplexer, excluding framing bits,
is higher than the sum of the minimum instantaneous incoming rates. The extra capacity
is used by stuffing extra dummy bits into each incoming signal until its rate is raised to
that of a locally generated clock signal.
Answer:
The __________ protocol is used only for the transmission of user data, typically in
multicast fashion among all participants in a session.
Answer:
First generation cellular networks made use of ________ multiplexing.
Answer:
The principal technologies used for wireless LANs are spread spectrum, narrowband
microwave, and ________.
Answer:
The Internet mail architecture is currently defined in RFC _______ .
Answer:
Since the early 1980s the most common first-generation system in North America has
been the ________ developed by AT&T.
Answer:
