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A ________ is a server that appears to the client as if it were an origin server.
A) tunnel
B) proxy
C) gateway
D) all of the above
Answer:
If the ________ has to do with the ability of the network to deliver packets via
some route in the face of localized failures and overloads.
A) Correctness
B) Robustness
C) Efficiency
D) Optimality
Answer:
The __________ is a measure of how much additional bandwidth is required to carry
data at the same data rate as without the code.
A) burst rate
B) code rate
C) stream rate
D) idle rate
Answer:
An example of digital data is ________ or character strings.
A) interlaced
B) text
C) audio
D) video
Answer:
________ is a general term used to encompass frequencies in the range of 3 kHz to 300
GHz.
A) Radio
B) Satellite
C) Terrestrial microwave
D) Broadcast radio
Answer:
X.25 is the standard protocol used for traditional ________ networks.
A) packet switching
B) circuit switching
C) subscriber loop
D) virtual
Answer:
With packet switching, a station transmits data in small blocks called ________.
A) data blocks
B) boxes
C) channels
D) packets
Answer:
A ________ LAN includes a central node to which stations are attached.
A) bus
B) star
C) tree
D) ring
Answer:
________ is one of the most fundamental requirements in the transmission of a stream
of bits from one device to another.
A) Standardization
B) Digitalization
C) Synchronization
D) Configuration
Answer:
A ________ delays packets as necessary so that the packet stream in a given class does
not exceed the traffic rate specified in the profile for that class.
A) marker
B) meter
C) dropper
D) shaper
Answer:
________ are widely used by enterprises to create WANs that span large geographic
areas, to provide site-to-site connections to branch offices, and to allow mobile users to
dial up their company LANs.
A) CEs
B) LSPs
C) VPNs
D) VCs
Answer:
Affecting not only mobile phones in automobiles, but even a mobile phone user
walking down an urban street, ________ occurs when there are rapid variations in
signal strength.
A) selective fading
B) nonselective fading
C) flat fading
D) fast fading
Answer:
The primary service used by stations to exchange MAC frames when the frame must
traverse the DS to get from a station in one BSS to a station in another BSS is
________.
A) association
B) integration
C) transition
D) distribution
Answer:
________ antenna architecture is the most important of the enhancements provided by
802.11n.
A) MIMO
B) Nomadic
C) Directed-beam
D) OFDM
Answer:
Dynamic use of bandwidth is utilized with ________.
A) virtual circuit packet switching and circuit switching
B) datagram packet switching and virtual circuit packet switching
C) circuit switching and datagram packet switching
D) space division switching and circuit switching
Answer:
A ________ is where the destination MAC address indicates that all devices on the
LAN should receive a copy of the frame.
A) unicast address
B) multicast address
C) simulcast address
D) broadcast address
Answer:
The _______ is a directory lookup service that provides a mapping between the name
of a host on the Internet and its numerical address.
A) MHS
B) MUA
C) ADMD
D) DNS
Answer:
With ________ a dedicated path is established between two stations for
communication.
A) block switching
B) packet switching
C) circuit switching
D) X.25
Answer:
_________ is the determination of the media and media parameters to be used.
A) Session setup
B) Session management
C) User capabilities
D) User availability
Answer:
The _________ is the ratio of the amplitude of the input signal to the carrier.
A) modulation index
B) frequency phase
C) division rate
D) none of the above
Answer:
Requiring line of site transmission and fewer amplifiers or repeaters than coaxial cable
over the same distance, ________ is used in long haul telecommunications.
A) terrestrial microwave
B) twisted pair
C) UTP
D) optical fiber
Answer:
If digital signaling elements all have the same algebraic sign, all positive or all
negative, then the signal is ________.
A) polar
B) unipolar
C) baseband
D) differential
Answer:
In the ________ all stations attach directly to a linear transmission medium. A
transmission from any station propagates the length of the medium in both directions
and can be received by all other stations.
A) backend network
B) bus topology
C) tree topology
D) medium access link
Answer:
In a ________ the modules are arranged in a vertical stack. Each layer in the stack
performs a related subset of the functions required to communicate with another
system.
A) protocol architecture
B) NSP
C) protocol data unit
D) frame relay
Answer:
The time it takes for a station to emit all of the bits of a frame onto the medium is the
________ time.
A) link
B) relay
C) propagation
D) transmission
Answer:
Three physical media are defined in the original 802.11 standard: DSSS, FHSS, and
________.
A) GFSK
B) UNNI
C) infrared
D) Barker sequence
Answer:
From customer to carrier is ________.
A) symmetric
B) upstream
C) downstream
D) asymmetric
Answer:
Addresses that refer to a group of hosts on one or more networks are referred to as
________.
A) distributed addresses
B) broadcast addresses
C) unicast addresses
D) multicast addresses
Answer:
A coding scheme that is commonly used in Europe and Japan is the ________.
A) B8ZS
B) AMI
C) amplitude shift keying
D) HDB3
Answer:
One prominent advantage of _______ over OFDMA is the lower peak-to-average
power ration of the transmit waveform, which benefit the mobile user in terms of
battery life and power efficiency.
A) PAPR
B) IFFT
C) FMDA
D) SC-FDMA
Answer:
The sequence 10101011 is the ________ and indicates the actual start of the frame and
enables the receiver to locate the first bit of the rest of the frame.
A) start frame delimiter
B) frame check sequence
C) preamble
D) LLC data
Answer:
________ are useful in city streets in congested areas, along highways, and inside large
public buildings.
A) Maximum bit rates
B) MTSOs
C) Microcells
D) Control channels
Answer:
To achieve greater distances in digital transmissions ________ are used.
Answer:
The ________ is designed to provide a simple, easy to implement, low overhead tool to
support a range of network services that are differentiated on the basis of performance.
Answer:
A ________ switch is one in which the signal paths are physically separate from one
another. Each connection requires the establishment of a physical path through the
switch that is dedicated solely to the transfer of signals between the two endpoints.
Answer:
The earliest applications of ________ were military, where it was used for its immunity
to jamming.
Answer:
A ________ timer is reset with each outgoing segment. If this timer ever expires
the protocol entity is required to send a segment, even if it duplicates a previous one.
Answer:
A ________ is an administratively configured broadcast domain consisting of a subset
of end stations attached to a LAN.
Answer:
________ noise is due to thermal agitation of electrons. It is present in all electronic
devices and transmission media and is a function of temperature.
Answer:
Fairness, QoS, and reservations are all issues related to congestion control that fall into
the category of __________ .
Answer:
The _______ accepts the message submitted by an MUA and enforces the policies of
the hosting domain and the requirements of Internet standards.
Answer:
Traffic designated as VPN traffic can only go from a VPN source to a destination in the
same VPN.
Answer:
Synchronous time division multiplexing is possible when the achievable data rate of the
medium exceeds the data rate of digital signals to be transmitted.
Answer:
The essential idea of the ________ technique is to spread the information signal over a
wider bandwidth to make jamming and interception more difficult.
Answer:
__________ is required to assure that the source does not overwhelm the destination by
sending data faster than they can be processed and absorbed.
Answer:
In a ________ guided configuration more than two devices share the same medium.
Answer:
Using fixed length packets and sometimes referred to as cell relay, ________ is
a culmination of developments in circuit switching and packet switching. It is
so efficient that it can offer a constant data rate channel even though it is using a packet
switching technique.
Answer:
HDLC uses asynchronous transmission.
Answer:
A routing algorithm that takes into account the traffic requirements of various flows and
that takes into account the resources available along various hops and through various
nodes is referred to as a ________ algorithm.
Answer:
IGMP, defined in RFC ______ , is used by hosts and routers to exchange multicast
group membership information over a LAN.
Answer:
The two commonly used transport level protocols used as part of the TCP/IP protocol
suite are TCP and ________.
Answer:
