CAS CS 97336

subject Type Homework Help
subject Pages 15
subject Words 1775
subject Authors William Stallings

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VoIP is the transmission of speech across IP-based network.
Answer:
The selection of a route is generally based on some performance criterion.
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Analog data must be converted to digital before transmission for packet switching.
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When there are multiple root servers with the same name, each has an identical copy of
the database for that server and the same IP address.
Answer:
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A digital signal is a sequence of discrete, discontinuous voltage pulses.
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The initiation, maintenance, and termination of a sustained data exchange require
management procedures for the exchange.
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Error detection found in data link control protocols such as HDLCis not a useful
technique.
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A user agent server issues SIP requests.
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In situations where the bit length of the link is greater than the frame length, serious
inefficiencies result.
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A wireless LAN is defined as one that makes use of a wireless transmission medium.
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OFDMA subcarriers are divided into groups and each group is named a ______ .
A) chip
B) hop
C) subchannel
D) SCG
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Answer:
Because of their simplicity and relatively low frequency response characteristics,
________ codes are commonly used for digital magnetic recording.
A) NRZ
B) AMI
C) VSES
D) B8ZS
Answer:
________ define a flow of packets between two endpoints or, in the case of multicast,
between a source endpoint and a multicast group of destination endpoints.
A) Pseudowires
B) Labels
C) Tunnels
D) Backbones
Answer:
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In a MIMO scheme the transmitter employs just a single antenna.
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Circuit switching is very efficient in handling digital data.
Answer:
If the server does not know the location of the members of the multicast group, then one
way to assure that the packet is received by all members of the group is to ________ a
copy of each packet to each network in the configuration over the least cost route for
each network.
A) unicast
B) broadcast
C) multicast
D) multiple multicast
Answer:
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The simplest form of digital encoding of ________ is to assign one voltage level to
binary- one and another to binary-zero.
A) digital data
B) carrier data
C) AM data
D) analog data
Answer:
One of the rules for CSMA/CD states, "after transmitting the jamming signal, wait a
random amount of time, then attempt to transmit again". This random amount of time is
referred to as the ________.
A) precursor
B) backlog
C) carrier time
D) backoff
Answer:
For ________ congestion avoidance, the network alerts end systems to growing
congestion within the network and the end systems take steps to reduce the offered load
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to the network.
A) backpressure
B) explicit
C) implicit
D) dynamic
Answer:
The ________ element represents the functions and hardware needed to connect digital
devices such as data processing devices and digital telephones to the network.
A) media gateway
B) digital switch
C) control unit
D) network interface
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In ________ the phase of the carrier signal is shifted to represent data.
A) MFSK
B) ASK
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C) FSK
D) PSK
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Frequency division multiplexing can be used with ________ signals.
A) digital signals carrying digital data
B) analog signals carrying digital data
C) analog
D) digital
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________ occurs when an electromagnetic signal encounters a surface that is large
relative to the wavelength of the signal.
A) Scattering
B) Diffraction
C) Reflection
D) Termination
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Answer:
Which of the following is NOT an enhancement of IPv6 over IPv4?
A) improved error recovery
B) address autoconfiguration
C) support for resource allocation
D) expanded address space
Answer:
Information that can be entered via a keyboard and is directly readable and printable is
________.
A) audio
B) graphic
C) video
D) text
Answer:
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Which of the following makes use of two optical fiber cables, one for transmission and
one for reception, and utilizes a technique known as intensity modulation.
A) 10BASE-T
B) 100BASE-FX
C) 100BASE-T4
D) 10BASE-F
Answer:
The growth of ________ enhances the ability of employees to take their business
context with them as they move about, resulting in the ability to use enterprise
information resources and services from virtually anywhere.
A) extranets
B) high-speed wireless access
C) WANS
D) remote data access
Answer:
Connection establishment in TCP always uses a ________.
A) four-way handshake
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B) three-way handshake
C) two-way handshake
D) handshake
Answer:
"Listen for connection attempt at specified security and precedence from specified
destination" is the description of the TCP Service Request ________ Primitive.
A) Generally Specified Passive Open
B) Unspecified Passive Open
C) Active Open With Data
D) Fully Specified Passive Open
Answer:
A scrambling coding technique based on bipolar-AMI and commonly used in North
America is ________.
A) HDB3
B) ASK
C) MFSK
D) B8ZS
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Answer:
In the case of a single network, ________ refers to an attached network device.
A) Port
B) Host
C) Socket
D) Entity
Answer:
"Recommended practice for the evaluation of 802.11 wireless performance" is the
scope of the ________ standard.
A) IEEE 802.11,2
B) IEEE 802.11f
C) IEEE 802.11r
D) IEEE 802.11a
Answer:
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In a data link control protocol, ________ control is achieved by retransmission of
damaged frames.
A) DLHC
B) data
C) error
D) flow
Answer:
Files, graphics, and messages exchanged among active group members in real time is
_________ .
A) multimedia
B) real-time workgroup
C) teleconferencing
D) distributed computation
Answer:
The communication task can be organized into three relatively independent layers:
network access layer, application layer, and ________ layer.
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A) transport
B) media
C) physical
D) processing
Answer:
Circuit switching was developed to handle ________ traffic.
A) voice
B) A/V
C) video
D) data
Answer:
In IGMP _____ hosts could join a multicast group and routers used a timer to
unsubscribe group members.
A) v1
B) v2
C) v3
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D) v4
Answer:
A set of standards has not yet been defined for LANs that specify a range of data rates
due to the variety of topologies and transmission media.
Answer:
Two problems that an FDM system must cope with are crosstalk and ________ noise.
A) blanketed
B) amplified
C) intermodulation
D) channeled
Answer:
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A ________ can convert a stream of digitized voice bits into packets.
A) softswitch
B) node
C) LAPF
D) virtual circuit
Answer:
In ________ transmission systems, an error occurs when a bit is altered between
transmission and reception.
A) analog
B) digital
C) idle
D) guided
Answer:
_________ codes are a widely used subclass of nonbinary BCH codes.
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Answer:
The maximum rate at which data can be transmitted over a given communication path
under given conditions is referred to as the ________.
Answer:
A router is able to anticipate congestion and prevent applications from causing an
overload.
Answer:
The __________, defined in RFC 3261, is an application level control protocol for
setting up, modifying, and terminating real-time sessions between participants over an
IP data network.
Answer:
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For the IEEE 802.11a LAN standard, the OFDM scheme consists of a set of ______
subcarriers with a base frequency of 0.3125 MHz.
Answer:
By assigning the same ________ to end systems on many switches, one or more VLAN
broadcast domains can be extended across a large network.
Answer:
The two facilities that TCP provides for labeling data are push and ________.
Answer:
_______ works by encoding voice information into a digital format, which can be
carried across IP networks in discrete packets.
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Answer:
Starting with a 32-bit block consisting of four 8-bit fields, the ________ contains a list
of one or more intermediate nodes to be visited on the way to a packet's destination.
Answer:
________ is a consortium of software providers, content delivery networks, and
networking equipment vendors whose purpose is to promote software-defined
networking.
Answer:
The first type of spread spectrum developed is known as _________ .
Answer:
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Thermal noise is also referred to as ________ noise.
Answer:
The most widely used high speed LANs today are based on ________ and
were developed by the IEEE 802.3 standards committee.
Answer:
The ________ is a measure of how much additional bandwidth is required to carry data
at the same data rate as without the code.
Answer:
The TS user can signal to the local TCP entity that it will passively wait for a request
with a ________ command. A server program such as time-sharing or a file transfer
application might do this.
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Answer:
A ________ is a general purpose computer running specialized software that turns it
into a smart phone switch. These cost significantly less than traditional circuit switches
and can provide more functionality.
Answer:
The key elements of a local area network are medium access control,
transmission medium, wiring layout, and ________.
Answer:
Each cell in a cellular network is allocated a band of frequencies and is served by a
________ consisting of transmitter, receiver and control unit.
Answer:

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