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Networks - 2

Description: Online complete study material to prepare for Information Technology covers all concepts of C, C++, PHP, HTML, test papers and notes for c, programming, C pointers, Exploring C, Arrays, Loops, Conditions, File Handling in C
Number of Questions: 25
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Tags: c programming C pointers Exploring C Arrays Loops Conditions File Handling in C C C++ PHP HTML Information Technology IT Data Communication & Networks
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If digital data rate of 9, 600 bps is encoded using 8-level PSK method, modulation rate is

  1. 1, 200 bands

  2. 3, 200 bands

  3. 4, 800 bands

  4. 9, 600 bands


Correct Option: B

Pick the correct statement.

  1. In connection-oriented service, the destination address is to be specified only during the setup.

  2. Initial setup is not possible in connectionless service.

  3. Packet sequencing is not guaranteed in connection-oriented service.

  4. Initial setup is required for connectionless service.


Correct Option: C

End-to-end connectivity is provided from host-to-host in

  1. network layer

  2. transport layer

  3. session layer

  4. none of these


Correct Option: B

The probability that a single bit will be in error on a typical public telephone line using 4, 800 bps modem is 10 to the power 3. If no error detection mechanism is used, residual error rate for a communication line using 9 bit frames is equal to

  1. 0.003

  2. 0.009

  3. 0.991

  4. 0.999


Correct Option: B

Hamming distance between 001111 and 211 is

  1. 1

  2. 2

  3. 3

  4. 4


Correct Option: C

Which of the following refers to term ''residual error rate''?

  1. Number of bits error per 24 hrs of continuous operation on an asynchronous line

  2. Probability that one or more error will be undetected when an error detection scheme is used

  3. Probability that one or more error will be detected when an error detection mechanism is used

  4. S/N ratio divided by ratio of energy per bit to noise per Hertz


Correct Option: B

How many class A, B and C network IDs can exist?

  1. 2, 113, 658

  2. 16, 382

  3. 126

  4. 128


Correct Option: A

The signal to noise ratio for a voice trade line is 30.1 db or a power ratio of 1023 : 1. The maximum achievable data rate on the line whose spectrum ranges from 300 Hz to 4, 300 Hz, is

  1. 6, 200 bps

  2. 9, 600 bps

  3. 3, 400 bps

  4. 31 bps


Correct Option: D

How many characters per sec (7 bit + 1 parity) can be transmitted over a 2,400 bps, if the transfer is asynchronous (1 start and 1 stop bit)?

  1. 300

  2. 240

  3. 250

  4. 275


Correct Option: B

FDDI is a

  1. ring network

  2. start network

  3. mesh network

  4. bus based network


Correct Option: A

In Ethernet CSMS/CD, the special bit sequence transmitted by media access management for collision handling is called

  1. preamble

  2. postamble

  3. jam

  4. none of the above


Correct Option: C

Working of WAN generally involves

  1. telephone lines

  2. microwaves

  3. satellites

  4. all of the above


Correct Option: D

The number of pairs of stations that can simultaneously communicate in Ethernet LAN is

  1. 1

  2. 2

  3. 3

  4. 4


Correct Option: A

Many large organizations with their offices in different countries of the world connect their computers through telecommunication satellites and telephone lines. Such a communication network is called

  1. LAN

  2. WAN

  3. ECONET

  4. ETHERNET


Correct Option: B

Which of the following is a wrong example of network layer?

  1. Internet Protocol (IP) - ARPANET

  2. X.25 Packet Level Protocol (PLP) - ISO

  3. Source Routing and Domain Naming - USE NET

  4. X.25 level 2-ISO


Correct Option: D

Which of the following is a non-polling system?

  1. TDMA

  2. Stop and wait

  3. Carrier sense system

  4. Continous ARQ


Correct Option: A,C

When a group of computers is connected together in a small area without the help of telephone lines, the network is called

  1. Remote Communication Network (RCN)

  2. Local Area Network (LAN)

  3. Wide Area Network (WAN)

  4. Value Added Network (VAN)


Correct Option: B

Standard of the Electronic Industries Association of America. What do the letters'RS' stand for?

  1. Recognized standard

  2. Random sequence

  3. Recommended standard

  4. Registered source


Correct Option: C

A network which is used for sharing data, software and hardware among several users owning microcomputers is called

  1. WAN

  2. MAN

  3. LAN

  4. VAN


Correct Option: C

Namr the communication circuit that transmits data in both directions, but not simultaneously.

  1. A simplex mode

  2. A half-duplex mode

  3. A full-duplex mode

  4. An asynchronous mode


Correct Option: B

Terminals are used to/for

  1. collect data from the physical system

  2. provide information for the manager

  3. communicate management decisions to the physical system

  4. all of the above


Correct Option: D

Communication between computers is almost

  1. serial

  2. parallel

  3. series parallel

  4. direct


Correct Option: A

Required characteristic(s) of an online real-time system is/are

  1. more than one CPU

  2. offline batch processing

  3. no delay in processing

  4. all of the above


Correct Option: C

An example of digital communication, rather than analog communication, is

  1. DDD

  2. DDS

  3. WATS

  4. DDT


Correct Option: B

Which of the following is not used in Local Area Networks (LAN)?

  1. Computer

  2. Modem

  3. Printer

  4. Cable


Correct Option: B
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