BSNL TTA FREE ONLINE TEST

DATA COMMUNICATION AND COMPUTER NETWORK 1
Q.1) What is the minimum header size of an IP Packet?
A.       32bytes
B.       16 bytes
C.       10 bytes
D.       20 bytes

Q.2) IPV4 address is

A. 16 bit
B. 32 bit
C. 8 bit
D. 64 bit

Q.3) What is the meaning of Bandwidth in Network?
A.       Transmission capacity of a communication channels
B.       Connected computers in the network
C.       Class of IP use in Network
D.       none of these

Q.4) .What is a Firewall in computer network?
A.       The physical boundary of Network
B.       A web browsing Software
C.       An operating system of computer network
D.       A system designed to prevent unauthorized access

Q.5) Which of following provides reliable communication
A.       all of these
B.       IP
C.       TCP
D.       UDP

Q.6) A router:
A.       determines on which outgoing link a packet is to be forwarded.
B.       forwards a packet to all outgoing links, except the link upon which the packet originated.
C.       forwards a packet to the next free outgoing link.
D.       forwards a packet to all outgoing links

Q.7) Which data communication method is used to transmit the data over a serial communication link?

A.       half duplex
B.       none of the above
C.       simplex
D.       full duplex
Q.8) Telephone systems may be classified as
A.       simplex and asymmetrical
B.       duplex and symmetrical.
C.       simplex and symmetrical
D.       duplex and asymmetrical.

Q.9) .A telephone customarily includes a 4-wire to 2-wire hybrid. The purpose of a hybrid is:
A.       to merge/separate signals associated with the microphone and speaker.
B.       none
C.       to combine the signals associated with the microphone and speaker.
D.       to interconnect the 4 wires of a telephone to a line.

Q.10) Why IP Protocol is considered as unreliable
A.       Duplicate packets may be generated
B.       A packet may be lost
C.       all of the above
D.       Packets may arrive out of order

Q.11) What is the uses of sub netting?
A.        none of these
B.        it divides network into network classes
C.        it speeds up the speed of network
D.        It divides one large network into several smaller ones

Q.12) Repeater operates in which layer of the OSI model ?
A.       Physical layer
B.       Transport layer
C.       Network layer
D.       Data link layer

Q.13) What does Protocol defines?
A.       Protocol defines how data is communicated
B.       Protocol defines when data is communicated
C.       Protocol defines what data is communicated
D.       all of these

Q.14) The Domain Name System (DNS) is primarily used to:
A.       remove the need for a user to indicate a host they wish to communicate with by means of an IP address
B.       determine the MAC address of a host, given its IP address.
C.       determine the symbolic name of a host, given its IP address
D.       determine the IP address of a host, given its MAC address

Q.15) Most data communications involving telegraph lines use:
A.       wide band channel
B.       simplex lines
C.       dialed service
D.       narrow band channel

Q.16) In a synchronous modem, the digital-to-analog converter transmits signal to the
A.       demodulator
B.       modulator
C.       terminal
D.       equalizer

Q.17) Which of the following communications lines is best suited to interactive processing applications?
A.       full duplex lines
B.       narrow band channel
C.       mixed band channel
D.       simplex lines
Q.18) Baseband transmission may be defined as the transmission of a signal over a link:
A.       by means of wires.
B.       without any change in frequency.
C.       at a different band of frequencies
D.       which is relatively short.

Q.19) The Internet is an example of a:
A.       cell switched network
B.       circuit switched network
C.       None
D.       packet switched network

Q.20) What is the minimum number of wires needed to send data over a serial communication link layer?

A. 1
B. 6
C. 4
D. 2

Q.21) What is address size of IPV6?

A. 256 bit
B. 32 bit
C. 64 bit
D. 128 bit

Q.22) Which of the following types of channels moves data relatively slowly?
A.       voice band channel
B.       broadband channel
C.       narrow band channel
D.       wide band channel

Q.23) A network that provides a constant bandwidth for the complete duration of a message transfer is a

A.       cell switched network
B.       packet switched network
C.       None
D.       circuit switched network

Q.24) A communications device that combines transmissions from several I/O devices into one line is a

A.       full-duplex line
B. modifier
C. multiplexer
D. concentrator

Q.25) Which of the following definitions correctly describes the Dynamic Host Configuration Protocol (DHCP)?
A.       DHCP is a routing protocol run by routers within a network
B.       DHCP enables a NIC to determine the IP address for a given MAC address.
C.       DHCP is a technique whereby IP addresses are assigned centrally by a server to each host
D.       DHCP enables a NIC to determine the MAC address for a given IP address
 

Answer Key

Q.1) 20 bytes

Q.2) 32 bit

Q.3) Transmission capacity of a communication channels

Q.4) A system designed to prevent unauthorized access

Q.5) TCP

Q.6) forwards a packet to all outgoing links

Q.7) full duplex

Q.8) duplex and symmetrical.

Q.9) to merge/separate signals associated with the microphone and speaker.

Q.10) all of the above

Q.11) It divides one large network into several smaller ones

Q.12) Physical layer

Q.13) all of these

Q.14) remove the need for a user to indicate a host they wish to communicate with by means of an IP address

Q.15) narrow band channel

Q.16) equalizer

Q.17) full duplex lines

Q.18) without any change in frequency.

Q.19) packet switched network

Q.20) 2

Q.21) 128 bit

Q.22) narrow band channel

Q.23) circuit switched network

Q.24) multiplexer

Q.25) DHCP is a technique whereby IP addresses are assigned centrally by a server to each host

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BSNL TTA ONLINE TEST COMPUTER WINDOWS AND DOS 2
BSNL TTA ONLINE TEST RESULT DATA COMMUNICATION AND COMPUTER NETWORK 1

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