CS601 Data Commnication Paper on 26 Nov 11

CS601 DATA COMMUNICATION DATE: 26 November 2011

TIME: 10 : 00 AM

Question No. 1: _______ is a multi point topology

Ø Ring

Ø Mesh

Ø Tree

Ø Bus

Question No. 2: Unidirectional traffic movement is overcome by dual ring technology.

Ø True

Ø False

Question No. 3: The _______ layer changes bits into electromagnetic signals.

Ø Physical

Ø Data Link

Ø Transport

Ø None of given

Question No. 4: In 8QAM each signal shift one baud represents________.

Ø 4 bits

Ø 2 bits

Ø 5 bits

Ø 3 bits

Question No. 5: In ________ transmission bits are transmitted over a single wire one at a time.

Ø Asynchronous serial

Ø Synchronous serial

Ø Parallel

Ø Asynchronous & Synchronous

Question No. 6: At the _________ layer a DCE takes data generated by DTE.

Ø Physical

Ø Transport

Ø Data Link

Ø Application

Question No. 7: In RS422 balanced mood two lines carry ________ signals which are not identical to each other.

Ø Same

Ø Different

Ø Digital

Ø Analog

Question No. 8: Standard orientation committee has _______ organization.

Ø 2

Ø 3

Ø 4

Ø None of above

Question No. 9: Converting binary bits into digital signal is ____________

Ø Analog to Digital

Ø Digital to Analog

Ø Digital to Digital

Ø Analog to Analog

Question No. 10: Frequency band in which 99% of the total power resides is called _________.

Ø Power bandwidth

Ø Half power bandwidth

Ø 3db bandwidth

Ø F.M

Question No. 11: The vertical distance from a given point on the wave form to the horizontal axis is called __________ of the signal.

Ø Phase

Ø Amplitude

Ø Frequency

Ø None of above

Question No. 12: Which one is not element of protocol.

Ø Semantics

Ø Timing

Ø Common service Module

Question No. 13: The ________ layer is responsible for delivery of message from one process to another.

Ø Transport Layer

Ø Network Layer

Ø Session Layer

Ø Application Layer

Question No. 14: Dividing data into manageable parts or data chunks is ______________.

Ø Packetizing

Ø Framing

Ø Both

Ø None

Question No. 15: ________ is measured on the horizontal axis in time domain plot.

Ø Time

Ø Phase

Ø Frequency

Ø Signal

Question No. 16: What is the protocol data unit (PDU) employed at the network layer?

Ø Segments

Ø Packets

Ø Frames

Ø Bits

Question No. 17: Give the names of any two devices that can be used for connecting among following situations:

1. LAN to LAN

2. LAN to WAN

3. MAN to WAN

Question No. 18: Phase Modulation is one of the methods used for :

1. Analog to Digital Conversion

2. Analog o Analog Conversion

3. Digital to Analog Conversion

Question No. 19: What will be the frequency of a signal completing 10 cycle in one second?

Question No. 20: If 64 bits are sent over transmission medium in one second, what will be the bit rate and bit interval?

Question No. 21: How does DTE and DCE works together for end to end communication?

Question No. 22: Using HDB3 scheme, encode the signal “1100001011” Question No. 23: Give advantages and disadvantages of Asynchronous and Synchronous transmission. Compare the both strategies.