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UNIT I

DATA TRANSMISSION, TRANSMISSION MEDIA

& WIRELESS TRANSMISSION

INTRODUCTION ( UNIT I (A))

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

A)Protocol

B) Medium

C)Signal

)All the a!ove

" The in#ormation to !e communicated in a data communications system is the _______.

A)Medium

B)Protocol

C)Message

)Transmission

$ %re&uency o# #ailure and networ' recovery time a#ter a #ailure are measures o# the _______ o# anetwor'.

A)Per#ormance

B)(elia!ility

C)Security

)%easi!ility

An unauthori*ed user is a networ' _______ issue.

A)Per#ormance

B)(elia!ility

C)Security

)All the a!ove

+ ,hich topology re&uires a central controller or hu!-

A)Mesh

B)Star

C)Bus

)(ing

,hich topology re&uires a multipoint connection-A)

Mesh

B)Star

C)Bus

)(ing

/ Communication !etween a computer and a 'ey!oard involves ______________ transmission.

A)simple0

1

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B)hal#duple0

C)#ullduple0

)automatic

2 A television !roadcast is an e0ample o# _______ transmission.

A)simple0

B)hal#duple0

C)#ullduple0

)automatic

3 A _______ connection provides a dedicated lin' !etween two devices.

A)pointtopoint

B)multipoint

C)primary

)secondary

14 5n a _______ connection6 more than two devices can share a single lin'.

A)pointtopoint

B)multipoint

C)primary

)secondary

11 5n _______ transmission6 the channel capacity is shared !y !oth communicating devices at all

times.

A)simple0

B)hal#duple0

C)#ullduple0

)hal#simple0

1" 5n the original A(PA78T6 _______ were directly connected together.

A)5MPs

B)host computers

C)networ's

)routers

1$ This was the #irst networ'.

A) CS78T

B)7S%78T

C)A7S78T

)A(PA78T

1 ,hich organi*ation has authority over interstate and international commerce in thecommunications #ield-

A)5T9T

"

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B)5888

C)%CC

)5S:C

1+ _______ are specialinterest groups that &uic'ly test6 evaluate6 and standardi*e new

technologies.

A)%orums

B) (egulatory agencies

C)Standards organi*ations

)All o# the a!ove

1 ,hich agency developed standards #or physical connection inter#aces and electronic signaling

speci#ications-

A)85A

B)5T9T

C)A7S5

) 5S:

1/ _______ is the protocol suite #or the current 5nternet.

A)TCP;5P

B)7CP

C)975a) and >!)

)none o# the a!ove

"$ 5n a ________ connection6 three or more devices share a lin'.

A)multipoint

B)pointtopoint

C)>a) and >!)

)none o# the a!ove

" ______ re#ers to the physical or logical arrangement o# a networ'.

A)ata #low

B)Mode o# operation

C)Topology

)7one o# the a!ove

"+ evices may !e arranged in a _____ topology.

A)mesh

B)ring

C)!us

)all o# the a!ove

" A _______ is a data communication system within a !uilding6 plant6 or campus6 or !etweennear!y !uildings.

A)MA7

B)?A7

C),A7

) none o# the a!ove

"/ A ______ is a data communication system spanning states6 countries6 or the whole world.

A)MA7

B)?A7

C),A7

)none o# the a!ove

"2 ________ is a collection o# many separate networ's.

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A)A ,A7

B)An internet

C)a ?A7

)7one o# the a!ove

"3 There are ______________ 5nternet service providers.

A)local

B)regional

C)national and international

)all o# the a!ove

$4 A ________ is a set o# rules that governs data communication.

A)#orum

B)protocol

C)standard

)none o# the a!ove

$1 ________ is an idea or concept that is a precursor to an 5nternet standard.

A)(C%

B)(%C

C)5

)none o# the a!ove

+