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When the mobile node moves its attachment point to another network, that network is
considered a foreign network for this host.
Answer:
Priority could be assigned on a message basis or on a connection basis.
Answer:
Some e-mail systems only serve users on a single computer; others provide service
across a network of computers.
Answer:
A transport protocol can be either connection oriented, such as UDP, or connectionless,
such as TCP.
Answer:
Adaptive routing algorithms typically rely on the exchange of information about traffic
conditions among nodes.
Answer:
The format of the Destination Options Header is the same as that of the Hop-by-Hop
Options Header.
Answer:
Flow control and error control can be provided on a per-channel basis by using a data
link control protocol such as HDLC.
Answer:
VoIP readily integrates with other services, such as combining Web access with
telephone features through a single PC or terminal.
Answer:
An MUA can employ a long-term message store.
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The less the network service provides, the more the transport protocol must do.
Answer:
In general, the equipment for encoding digital data into a digital signal is more complex
and expensive than digital to analog modulation equipment.
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TCP numbers the segments that it sends to a particular destination port sequentially.
Answer:
MPLS imposes a connectionless framework on an IP-based internet and thus provides
the foundation for sophisticated and reliable QoS traffic contracts.
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Coaxial cable is used to transmit both analog and digital signals.
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The effect of ARQ is to turn an unreliable data link into a reliable one.
Answer:
Effective use of traffic engineering can substantially increase usable network capacity.
Answer:
POP3 is more complex than IMAP.
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Cellular technology is the foundation of mobile wireless communications.
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The packet switching network is a distributed collection of packet switching nodes.
Because the nodes are distributed, there is a time delay between a change in status in
one portion of the network and knowledge of that change elsewhere.
Answer:
A user module acts as an interface to a wireless LAN. .
Answer:
A major disadvantage of IEEE 802.11n is that it is not upward compatible with 802.11a
or 802.11b.
Answer:
One unwanted effect of multipath propagation is that multiple copies of a signal may
arrive at different phases.
Answer:
With unicast transmission, the router may be required to forward two or more copies of
an incoming datagram.
Answer:
A digital signal is one in which the signal intensity maintains a constant level for some
period of time and then abruptly changes to another constant level.
Answer:
In times of congestion elastic traffic will continue to supply a high load and inelastic
traffic will be crowded off.
Answer:
Twisted pair is much less susceptible to interference and crosstalk than coaxial cable.
Answer:
Fairness is a requirement for a routing function.
Answer:
Multiplexing allows several transmission sources to share a larger transmission
capacity.
Answer:
WANs have much greater capacity than LANs to carry what is generally a greater
internal communications load.
Answer:
With time division multiplexing, modulation equipment is needed to move each signal
to the required frequency band and multiplexing equipment is needed to combine the
modulated signals.
Answer:
For most applications running as part of the TCP/IP protocol architecture, the transport
layer protocol is TCP.
Answer:
The OSI protocol architecture consists of five layers: physical, network access, internet,
transport and application.
Answer:
The Internet checksum is considerably less effective than the CRC.
Answer:
A transmission of a frame by any one station in a bus or tree topology can be heard by
other stations.
Answer:
To avoid unnecessary duplication of packets each router must route packets on the basis
of both source and multicast destination.
Answer:
A hub can be configured to recognize a malfunctioning station that is jamming the
network and to cut that station out of the network.
Answer:
Changes in corporate data traffic patterns are driving the creation of high-speed WANs.
Answer:
It is usually desirable to have a physically separate communications path for control
information.
Answer:
A codepoint is simply a set of state information at a router that expires unless regularly
refreshed from the entity that requested
the codepoint.
Answer:
For ________ transmission media, the transmission capacity, in terms of either data rate
or bandwidth, depends critically on the distance and on whether the medium is
point-to-point or multipoint.
A) unguided
B) guided
C) terrestrial microwave
D) atmospheric
Answer:
A specific preplanned route through the network between two stations is a(n) ________
virtual circuit.
A) transport
B) direct
C) internal
D) external
Answer:
With __________ codes, data are processed in chunks of m bits, called symbols.
A) FEC
B) systematic
C) Reed-Solomon
D) all of the above
Answer:
Electronic mail, remote logon, network management and Web access are examples of
________ applications.
A) elastic
B) real-time
C) file transfer
D) transport
Answer:
The devices attached to a network are referred to as ________. These may be
computers, terminals, telephones or other communicating devices.
A) entities
B) relays
C) nodes
D) stations
Answer:
The key features of a protocol are: syntax, semantics and ________.
A) presentation
B) timing
C) network access
D) peer layering
Answer:
________ is a reason for using SDN domains.
A) Scalability
B) Privacy
C) Incremental deployment
D) All of the above
Answer:
In ________ transmission each block of data is formatted as a frame that includes a
starting and an ending flag.
A) parallel
B) asynchronous
C) analog
D) synchronous
Answer:
The TCP header ________ field contains the number of data octets, beginning with the
sequence number indicated in the acknowledgment field, that the sender is willing to
accept.
A) Window
B) Checksum
C) Options
D) Acknowledgment Number
Answer:
________ was developed to provide the same type of service as HDSL but over a single
twisted pair line.
A) SDSL
B) QAM
C) VDSL
D) AMI
Answer:
HTTP is ___________ .
A) a transaction-oriented client/server protocol
B) a stateless protocol
C) flexible in the formats it can handle
D) all of the above
Answer:
Facsimile, computer aided design, publishing and medical imaging are all ________
based applications.
A) text
B) image
C) video
D) audio
Answer:
TCP uses a ________ flow control technique.
A) sliding-window
B) upper-layer
C) sequential
D) credit-based
Answer:
Protocols that communicate which label goes with which FEC are
called ________.
A) label routing protocols
B) label stacking protocols
C) label switching protocols
D) label distribution protocols
Answer:
For virtually all protocols data are transferred in blocks called ________.
A) PDUs
B) segments
C) NSAPs
D) datagrams
Answer:
The DS specifications refer to the forwarding treatment provided at a router as
________. This must be available at all routers and typically is the only part of DS
implemented in interior routers.
A) WFQ
B) QoS
C) PHB
D) EF
Answer:
A ___________ is an isolated error condition that alters one bit but does not affect
nearby bits.
A) parity error
B) burst error
C) single-bit error
D) streaming error
Answer:
A(n) ________ is a sequence of packets traversing a network that share a set of header
field values.
A) flow
B) action set
C) API
D) SDN data plane
Answer:
Many of the error-correcting block codes that are in use are in a category called
________ .
A) cyclic codes
B) logic codes
C) linear codes
D) BCH codes
Answer:
The ________ layer contains the logic needed to support the various user applications.
A) internet
B) physical
C) transport
D) application
Answer:
Typically, the ________ function is housed in the user's computer and is referred to as a
client e-mail program or a local network e-mail server.
A) MDA
B) MHS
C) MUA
D) MTA
Answer:
Data are sent in blocks called ________.
A) links
B) units
C) entities
D) frames
Answer:
The ratio of data bits to total bits, k/n, is called the _________ .
A) code rate
B) parity-check matrix
C) systematic code
D) redundancy
Answer:
A group of workstations that form a multicast group such that a transmission from any
member is received by all other group members is _____________.
A) teleconferencing
B) distributed computation
C) real-time workgroup
D) multimedia
Answer:
Defined as the power output in a particular direction compared to that produced in any
direction by a perfect omnidirectional antenna, ________ is a measure of the
directionality of the antenna.
A) effective area
B) antenna gain
C) parabola
D) antenna wavelength
Answer:
A key element of the ________ is that a high percentage of transmitted packets will be
successfully delivered.
A) routing service
B) best effort service
C) controlled load service
D) guaranteed service
Answer:
________ is an Internet standard defined in RFC 1939 that supports the basic functions
of download and delete for e-mail retrieval.
A) POP3
B) IMAP4
C) ADMD
D) All of the above
Answer:
A ________ is a collection of interconnected access points with a software protocol
structure that enables communication.
A) network
B) I/O channel
C) carrier access station
D) Fibre channel
Answer:
First generation cellular networks ________.
A) were FDDI
B) were digital
C) were analog
D) were based on code division multiple access
Answer:
The _________ is responsible for transferring the message from the MHS to the MS.
A) MDA
B) ADMD
C) MTA
D) MUA
Answer:
The rapid conversion of consumer electronics to digital technology is having an impact
on both the Internet and corporate intranets. Two examples of this trend are ________.
A) server farms and DVDs
B) power workgroups and server farms
C) DVDs and CD-ROMs
D) digital versatile disks and digital still cameras
Answer:
With ________ multiplexing a number of signals are carried simultaneously on the
same medium by allocating to each signal a different frequency band.
Answer:
The primary function of a ________ network is to accept packets from a source station
and deliver them to a destination station.
Answer:
Delay distortion occurs because the velocity of propagation of a signal through a guided
medium varies with frequency.
Answer:
A ________ operates at layer 3 of the OSI architecture and routes packets
between potentially different networks. .
Answer:
As the mobile user covers distances well in excess of a wavelength, the
urban environment changes as the user passes buildings of different heights, vacant
lots, and intersections. Over these longer distances, there is a change in the
average received power level about which the rapid fluctuations occur. This is referred
to as ________.
Answer:
Explicit congestion signaling approaches can be divided into three general categories:
Credit based, rate based, and ________ .
Answer:
The total collection of devices that receive broadcast frames from each other is referred
to as a ________.
Answer:
With ________ ARQ the only frames retransmitted are those that receive a
negative acknowledgment or those that time out.
Answer:
An ___________ is a group of bits in which two successive erroneous bits are always
separated by less than a given number x of correct bits.
Answer:
For ________, a single, permanent route is configured for each source-destination pair
of nodes in the network. The routes only change when there is a change in the topology
of the network.
Answer:
_______ is an extension to the RFC 822 framework that is intended to address some of
the problems and limitations of the use of SMTP and RFC 822 for electronic mail.
Answer:
The efforts to compensate for the errors and distortions introduced by multipath fading
fall into three general categories: forward error correction, diversity techniques, and
________.
Answer:
A technique for assuring that a transmitting entity does not overwhelm a receiving
entity with data is ________.
Answer:
The original routing algorithm, designed in 1969, was a distributed adaptive algorithm
using estimated delay as the performance criterion and a version of the ________
algorithm.
Answer:
TCP mechanisms can be grouped into the categories of data transfer,
connection termination, and ________.
Answer:
A ________ service provides for the establishment, maintenance, and termination of a
logical connection between TS users. To date this is the most common type of protocol
service available and has a wide variety of applications.
Answer:
Second generation systems provide multiple channels per cell, but each channel is
dynamically shared by a number of users using time division multiple access or
________.
Answer:
In the 802.3 frame format, a 7-octet pattern of alternating 0s and 1s used by the receiver
to establish bit synchronization is the ________.
Answer:
Bose-Chaudhuri-Hocquenghem is an example of a _________ code.
Answer:
The act of sending a packet from a source to the members of a multicast group is
referred to as __________ .
Answer:
