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Data COMM midterm EXAM

Total questions: 45

Worksheet time: 45mins

Name
Class
Date
1.

A computer network permits sharing of

a)

Resources

b)

Information

c)

Both A and B

d)

None of these

2.

The first operational computer network in the world was the _____ for yhe United States Department of Defense

a)

ARPANET

b)

ERNET

c)

SKYNET

d)

DARPANET

3.

ATM stands for

a)

Automatic Taller Machine

b)

Automated Teller Machine

c)

Automatic Transfer Machine

d)

Automated transfer machine

4.

_______ is the technology that connects the machines and people within a site in a small area

a)

LAN

b)

MAN

c)

WAN

d)

None of these

5.

______ is a network that covers geographic areas that are larger, such as districts or cities

a)

LAN

b)

MAN

c)

WAN

d)

None of these

6.

______ is a network that this technology connects sites that are in diverse locations

a)

LAN

b)

MAN

c)

WAN

d)

None of these

7.

______ is a collection of point-to-point links that may form a circle

a)

LAN

b)

Bus Topology

c)

WAN

d)

Ring Topology

8.

ATM networks are

a)

connectionless

b)

Interconnected

c)

connection oriented

d)

None of these

9.

_______ refers to two characteristics: when data should be sent and how fast it can be sent.

a)

Semantics

b)

Timing

c)

Syntax

d)

None of these

10.

_______ refers to the structure or format of the data, meaning the order in which they are presented.

a)

All of these

b)

Timing

c)

Syntax

d)

Semantics

11.

______ refers to the physical or logical arrangement of a network.

a)

Data flow

b)

Mode of operation

c)

Topology

d)

None of these

12.

________ is a collection of many separate networks.

a)

A WAN

b)

An internet

c)

A LAN

d)

None of these

13.

Frequency of failure and network recovery time after a failure are measures of the _______of a network.

a)

Performance

b)

Feasibility

c)

Security

d)

Reliability

14.

In _______ transmission, the channel capacity is shared by both communicating devices at all times.

a)

full-duplex

b)

half-duplex

c)

half-simplex

d)

simplex

15.

Which organization has authority over interstate and international commerce in the communications field?

a)

ISOC

b)

ITU-T

c)

IEEE

d)

FCC

16.

The information to be communicated in a data communications system is the _______.

a)

Message

b)

Transmission

c)

Protocol

d)

Medium

17.

Communication between a computer and a keyboard involves ______________ transmission.

a)

automatic

b)

full-duplex

c)

half-duplex

d)

simplex

18.

In a ______ connection, two and only two devices are connected by a dedicated link.

a)

point-to-point

b)

multipoint

c)

None of these

d)

multipoint and point-to-point

19.

Which topology requires a central controller or hub?

a)

Mesh

b)

Bus

c)

Star

d)

Ring

20.

A ________ is a set of rules that governs data communication.

a)

protocol

b)

forum

c)

None of these

d)

standard

21.

An unauthorized user is a network _______ issue.

a)

Performance

b)

All of these

c)

Security

d)

Reliability

22.

A television broadcast is an example of _______ transmission.

a)

automatic

b)

full-duplex

c)

simplex

d)

half-duplex

23.

The _______ is the physical path over which a message travels.

a)

Medium

b)

All of these

c)

Signal

d)

Protocol

24.

Which agency developed standards for physical connection interfaces and electronic signaling specifications?

a)

EIA

b)

ITU-T

c)

ANSI

d)

ISO

25.

In a ________ connection, three or more devices share a link.

a)

None of these

b)

multipoint

c)

point-to-point

d)

point-to-point and multipoint

26.

A _______ is a data communication system within a building, plant, or campus, or between nearby buildings.

a)

WAN

b)

MAN

c)

none of these

d)

LAN

27.

Devices may be arranged in a _____ topology.

a)

All of these

b)

bus

c)

ring

d)

mesh

28.

Which topology requires a multipoint connection?

a)

Mesh

b)

Star

c)

Bus

d)

Ring

29.

The _______ layer ensures interoperability between communicating devices through transformation of data into a mutually agreed upon format.

a)

network

b)

presentation

c)

transport

d)

session

30.

The _______ model shows how the network functions of a computer ought to be organized.

a)

ANSI

b)

CCITT

c)

OSI

d)

ISO

31.

Mail services are available to network users through the _______ layer.

a)

Data link

b)

Physical

c)

Application

d)

Transport

32.

Layer 2 lies between the physical layer and the _______ layer.

a)

None of these

b)

Transport

c)

Data link

d)

Network

33.

The_________ layer is responsible for the delivery of a message from one process to anotheR.

a)

network

b)

none of these

c)

transport

d)

physical

34.

Which of the following is an application layer service?

a)

File transfer and access

b)

All of these

c)

Mail service

d)

Remote log-in

35.

The _______ layer is responsible for delivering data units from one station to the next without errors

a)

physical

b)

transport

c)

network

d)

data link

36.

The session, presentation, and application layers are the ____ support layers.

a)

both user and network

b)

network

c)

user

d)

neither user nor network

37.

The ________ layer is responsible for the process-to-process delivery of the entire message.

a)

physical

b)

transport

c)

network

d)

data link

38.

In the OSI model, what is the main function of the transport layer?

a)

node-to-node delivery

b)

updating and maintenance of routing tables

c)

synchronization

d)

process-to-process message delivery

39.

The _______ layer lies between the network layer and the application layer.

a)

None of these

b)

Data link

c)

Transport

d)

Physical

40.

The ______ layer establishes, maintains, and synchronizes the interactions between communicating devices

a)

transport

b)

network

c)

session

d)

physical

41.

Why was the OSI model developed?

a)

The rate of data transfer was increasing exponentially

b)

Standards were needed to allow any two systems to communicate

c)

Manufacturers disliked the TCP/IP protocol suite.

d)

None of these

42.

In the OSI model, as a data packet moves from the lower to the upper layers, headers are _______

a)

removed

b)

added

c)

modified

d)

rearranged

43.

In the OSI model, encryption and decryption are functions of the ________ layer.

a)

application

b)

transport

c)

presentation

d)

session

44.

The ______ layer adds a header to the packet coming from the upper layer that includes the logical addresses of the sender and receiver.

a)

physical

b)

None of these

c)

data link

d)

network

45.

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.

a)

transport

b)

physical

c)

presentation

d)

session