WorksheetsData COMM midterm EXAM
Total questions: 45
Worksheet time: 45mins
A computer network permits sharing of
Resources
Information
Both A and B
None of these
The first operational computer network in the world was the _____ for yhe United States Department of Defense
ARPANET
ERNET
SKYNET
DARPANET
ATM stands for
Automatic Taller Machine
Automated Teller Machine
Automatic Transfer Machine
Automated transfer machine
_______ is the technology that connects the machines and people within a site in a small area
LAN
MAN
WAN
None of these
______ is a network that covers geographic areas that are larger, such as districts or cities
LAN
MAN
WAN
None of these
______ is a network that this technology connects sites that are in diverse locations
LAN
MAN
WAN
None of these
______ is a collection of point-to-point links that may form a circle
LAN
Bus Topology
WAN
Ring Topology
ATM networks are
connectionless
Interconnected
connection oriented
None of these
_______ refers to two characteristics: when data should be sent and how fast it can be sent.
Semantics
Timing
Syntax
None of these
_______ refers to the structure or format of the data, meaning the order in which they are presented.
All of these
Timing
Syntax
Semantics
______ refers to the physical or logical arrangement of a network.
Data flow
Mode of operation
Topology
None of these
________ is a collection of many separate networks.
A WAN
An internet
A LAN
None of these
Frequency of failure and network recovery time after a failure are measures of the _______of a network.
Performance
Feasibility
Security
Reliability
In _______ transmission, the channel capacity is shared by both communicating devices at all times.
full-duplex
half-duplex
half-simplex
simplex
Which organization has authority over interstate and international commerce in the communications field?
ISOC
ITU-T
IEEE
FCC
The information to be communicated in a data communications system is the _______.
Message
Transmission
Protocol
Medium
Communication between a computer and a keyboard involves ______________ transmission.
automatic
full-duplex
half-duplex
simplex
In a ______ connection, two and only two devices are connected by a dedicated link.
point-to-point
multipoint
None of these
multipoint and point-to-point
Which topology requires a central controller or hub?
Mesh
Bus
Star
Ring
A ________ is a set of rules that governs data communication.
protocol
forum
None of these
standard
An unauthorized user is a network _______ issue.
Performance
All of these
Security
Reliability
A television broadcast is an example of _______ transmission.
automatic
full-duplex
simplex
half-duplex
The _______ is the physical path over which a message travels.
Medium
All of these
Signal
Protocol
Which agency developed standards for physical connection interfaces and electronic signaling specifications?
EIA
ITU-T
ANSI
ISO
In a ________ connection, three or more devices share a link.
None of these
multipoint
point-to-point
point-to-point and multipoint
A _______ is a data communication system within a building, plant, or campus, or between nearby buildings.
WAN
MAN
none of these
LAN
Devices may be arranged in a _____ topology.
All of these
bus
ring
mesh
Which topology requires a multipoint connection?
Mesh
Star
Bus
Ring
The _______ layer ensures interoperability between communicating devices through transformation of data into a mutually agreed upon format.
network
presentation
transport
session
The _______ model shows how the network functions of a computer ought to be organized.
ANSI
CCITT
OSI
ISO
Mail services are available to network users through the _______ layer.
Data link
Physical
Application
Transport
Layer 2 lies between the physical layer and the _______ layer.
None of these
Transport
Data link
Network
The_________ layer is responsible for the delivery of a message from one process to anotheR.
network
none of these
transport
physical
Which of the following is an application layer service?
File transfer and access
All of these
Mail service
Remote log-in
The _______ layer is responsible for delivering data units from one station to the next without errors
physical
transport
network
data link
The session, presentation, and application layers are the ____ support layers.
both user and network
network
user
neither user nor network
The ________ layer is responsible for the process-to-process delivery of the entire message.
physical
transport
network
data link
In the OSI model, what is the main function of the transport layer?
node-to-node delivery
updating and maintenance of routing tables
synchronization
process-to-process message delivery
The _______ layer lies between the network layer and the application layer.
None of these
Data link
Transport
Physical
The ______ layer establishes, maintains, and synchronizes the interactions between communicating devices
transport
network
session
physical
Why was the OSI model developed?
The rate of data transfer was increasing exponentially
Standards were needed to allow any two systems to communicate
Manufacturers disliked the TCP/IP protocol suite.
None of these
In the OSI model, as a data packet moves from the lower to the upper layers, headers are _______
removed
added
modified
rearranged
In the OSI model, encryption and decryption are functions of the ________ layer.
application
transport
presentation
session
The ______ layer adds a header to the packet coming from the upper layer that includes the logical addresses of the sender and receiver.
physical
None of these
data link
network
In the OSI model, when data is transmitted from device A to device B, the header from A’s layer 5 is read by B’s _______ layer.
transport
physical
presentation
session
