Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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Logical grouping of information sent as a network layer unit over a transmission medium without
prior establishment of a virtual circuit. Are the primary information units in the
Internet a. | POP | c. | bits | b. | datagram | d. | voltage | | | | |
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2.
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The
wrapping of data in a particular protocol header. For example, Ethernet data is wrapped in a specific
Ethernet header before network transit. Also, when bridging dissimilar networks, the entire frame
from one network is just placed in the header used by the data link layer protocol of the other
network. a. | encapsulation | c. | sequencing | b. | frame check sequence | d. | bridging | | | | |
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3.
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Logical grouping of information sent as a data link layer unit over a transmission medium. Often
refers to the header and trailer that surround the user data contained in the unit (used for
synchronization and error control). a. | packet | c. | frame | b. | data | d. | segment | | | | |
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4.
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The
_____ layer defines the electrical, mechanical, procedural, and functional specifications for
activating, maintaining, and deactivating the physical link between end systems. a. | data link | c. | network | b. | physical | d. | transport | | | | |
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5.
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This
layer provides reliable transit of data across a physical link. Is concerned with physical
addressing, network topology, line discipline, error notification, ordered delivery of frames, and
flow control. The IEEE has divided this layer into two sublayers: the MAC sublayer and the LLC
sublayer. a. | physical | c. | network | b. | data link | d. | application | | | | |
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6.
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This
layer provides connectivity and path selection between two end systems. Is the layer at which routing
occurs. a. | physical | c. | datalink | b. | network | d. | session | | | | |
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7.
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This
layer is responsible for reliable network communication between end nodes. Provides mechanisms for
the establishment, maintenance, and termination of virtual circuits, transport fault detection and
recovery, and information flow control. a. | physical | c. | network | b. | datalink | d. | transport | | | | |
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8.
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This
layer establishes, manages, and terminates sessions between
applications and
manages data exchange between presentation layer entities. a. | application | c. | session | b. | presentation | d. | transport | | | | |
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9.
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This
layer ensures that information sent by the application layer of one system will be readable by the
application layer of another. Also is concerned with the data structures used by programs and
therefore negotiates data transfer syntax for the application layer. a. | application | c. | session | b. | presentation | d. | datalink | | | | |
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10.
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This
layer provides services to processes (such as electronic mail, file transfer, and terminal
emulation) that are outside of the OSI model. Identifies and establishes the availability of intended
communication partners (and the resources required to connect with them), synchronizes cooperating
applications, and establishes agreement on procedures for error recovery and control of data
integrity. a. | application | c. | session | b. | presentation | d. | transport | | | | |
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11.
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Logical grouping of information that includes a header containing control information and
(usually) user data. Are most often used to refer to network layer units of data. a. | Frame | c. | Data | b. | Segment | d. | Packet | | | | |
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12.
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_____ computing calls for each network device to run both client and server portions of an
application. Also describes communication between implementations of the same OSI reference model
layer in two different network devices. a. | Server | c. | Domain | b. | Client Server | d. | Peer-to-peer | | | | |
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13.
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What
is a segment? a. | Section of a
network that is bounded by bridges, routers, or switches | c. | Term used in the TCP specification to describe a single
transport layer unit of information. | b. | In a LAN using a bus topology, is a continuous electrical
circuit that is often connected to others with repeaters | d. | all of these apply | | | | |
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14.
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Common
name for the suite of protocols developed by the U.S. Department of Defense in the 1970s to support
the construction of worldwide internetworks. TCP and IP are the two best-known protocols in the
suite.
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15.
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designers of TCP/IP thought that the higher level protocols should include the session and
presentation layer details. They just created a layer that handles high-level protocols, issues of
representation, encoding, and dialog control. The TCP/IP combines all application-related issues into
one layer and ensures this data is properly packaged for the next layer. This is also referred to as
the process layer.
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a. | TCP/IP
application layer | c. | TCP/IP internet
layer | b. | TCP/IP transport layer | d. | TCP/IP network layer | | | | |
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16.
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This
layer deals with the quality-of-service issues of reliability, flow control, and error correction.
One of its protocols, the transmission control protocol (TCP), provides excellent and flexible ways
to create reliable, well-flowing, low-error network communications. TCP is a connection-oriented
protocol. It dialogues between source and destination while packaging application layer information
into units called segments. Connection-oriented does not mean that a circuit exists between the
communicating computers (that would be circuit switching). It does mean that Layer 4 segments travel
back and forth between two hosts to acknowledge the connection exists logically for some period. This
is known as packet switching. a. | TCP/IP application layer | c. | TCP/IP physical layer | b. | TCP/IP transport
layer | d. | TCP/IP network
layer | | | | |
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17.
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The
purpose of this layer is to send source packets from any network on the internetwork and have them
arrive at the destination independent of the path and networks they took to get there. The specific
protocol that governs this layer is called the Internet Protocol (IP). Best path determination and
packet switching occur at this layer. Think of it in terms of the postal system. When you mail a
letter, you do not know how it gets there (there are various possible routes), but you do care that
it arrives. a. | TCP/IP
application layer | c. | TCP/IP internet
layer | b. | TCP/IP transport layer | d. | TCP/IP network layer | | | | |
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18.
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The
name of this layer is broad and somewhat confusing. It also is called the host-to-network
layer. Sometimes, it.s shown as two layers, as in the OSI model. This layer is concerned with all
the issues that an IP packet requires to actually cross a physical link from one device to a directly
connected one. It includes the LAN and WAN technology details, and all the details in the OSI
physical and data link layers. a. | TCP/IP application layer | c. | TCP/IP internet layer | b. | TCP/IP transport
layer | d. | TCP/IP network
layer | | | | |
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19.
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Which
of the following best defines standards? a. | A set of rules or procedures that are either widely used
or officially specified | c. | A set of rules
that govern how computer workstations exchange information | b. | A connection of computers, printers, and
other devices for purposes of
communication | d. | A device connected to a computer to provide auxiliary
functions | | | | |
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20.
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What
is the OSI model? a. | A conceptual
framework that specifies how information travels through networks | c. | A conceptual framework that specifies which network
functions occur at each layer | b. | A model that describes how data makes its way from one
application
program to another through a network | d. | All of the above | | | | |
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21.
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As
described by the OSI model, how does data move across a network? a. | Directly from each layer at one computer to
the corresponding layers at another computer | c. | Down through the layers at one computer and up through the
layers at
another | b. | Through wires connecting each layer from computer to
computer | d. | Through layers in wires between
computers | | | | |
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22.
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Which
best defines the function of the lower layers (called the media
layers) of the
OSI model? a. | Provide for the
accurate delivery of data between computers | c. | Receive data from peripheral
devices | b. | Convert data into the 1s and 0s that a computer
understands | d. | Control the physical delivery of messages
over the network | | | | |
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23.
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Which
of the following describes the host layers of the OSI model? a. | Control the physical delivery of messages
over the network | c. | Contain data that is more like 1s and 0s than
like human language | b. | Make up the lower layers in the OSI
model | d. | Provide for accurate delivery of data between
computers | | | | |
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24.
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Which
of the following best describes the purpose of the physical layer? a. | Defines the electrical, mechanical,
procedural, and functional
specifications for activating, maintaining, and
deactivating the link
between end systems | c. | Provides connectivity and path selection between two end
systems | b. | Provides reliable transit of data across a physical
link | d. | Establishes, manages, and terminates sessions
between applications and manages data exchange between presentation layer
entities | | | | |
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25.
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Which
layer of the OSI model is concerned with physical addressing, network topology, line discipline,
error notification, ordered delivery of frames, and flow control? a. | Physical layer
| c. | Transport layer | b. | Data link
layer | d. | Network layer | | | | |
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26.
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Which
layer of the OSI model provides connectivity and path selection between two end systems where routing
occurs? a. | Physical
layer | c. | Network layer | b. | Data link
layer | d. | Transport layer | | | | |
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27.
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Which
layer of the OSI model is responsible for reliable network communication between end nodes and
provides mechanisms for the establishment, maintenance, and termination of virtual circuits,
transport fault detection and recovery, and information flow control? a. | Physical
layer | c. | Network layer | b. | Data link layer
| d. | Transport layer | | | | |
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28.
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Which
layer of the OSI model establishes, manages, and terminates sessions between applications and manages
data exchange between presentation layer entities? a. | Transport layer
| c. | Presentation layer | b. | Session layer | d. | Application layer | | | | |
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29.
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Which
layer of the OSI model ensures that information sent by the application layer of one system will be
readable by the application layer of another system, is concerned with the data structures used by
programs, and negotiates data transfer syntax for the application layer? a. | Transport
layer | c. | Presentation layer | b. | Session layer | d. | Application layer | | | | |
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30.
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Which
layer of the OSI model identifies and establishes the availability of intended communication
partners, synchronizes cooperating applications, and establishes agreement on procedures for error
recovery and control of data integrity? a. | Transport layer | c. | Presentation layer | b. | Session layer | d. | Application layer | | | | |
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31.
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Which
of the following best defines encapsulation? a. | Segmenting data so that it flows
uninterrupted through the network | c. | Moving data in groups so that it stays
together | b. | Compressing data so that it moves
faster | d. | Wrapping of data in a particular protocol
header | | | | |
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32.
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What
is a data packet? a. | Logically grouped
units of information | c. | Auxiliary function provided by
peripherals | b. | Transmission devices | d. | Virtual circuits | | | | |
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