Data Communication And Computer Network 1(TTA)
INSTRUCTIONS-1. NUMBER OF QUESTIONS 252. HAS A TIME LIMIT OF 15 MINUTES3. HAS A PASS MARKS OF 30%4. QUESTIONS PER PAGE 15. EACH QUESTIONS HAS 1 MARKS6. NEGATIVE MARKING FOR EACH QUESTIONS IS 0. 257. WILL ALLOW TO YOU GO BACK ,SKIP AND CHANGE YOUR ANSWERS8. WILL ALLOW TO YOU PRINT OUT YOUR RESULT AND CERTIFICATE 9. WILL ALLOW TO YOU PRINT OUT YOURS RESPONSE SHEET WITH CORRECT ANSWER KEY AND EXPLANATION.
- 1.Telephone systems may be classified as
- A.
Duplex and symmetrical.
- B.
Duplex and asymmetrical.
- C.
Simplex and asymmetrical
- D.
simplex and symmetrical
- 2.A network that provides a constant bandwidth for the complete duration of a message transfer is a
- A.
circuit switched network
- B.
cell switched network
- C.
packet switched network
- D.
None
- 3.A router:
- A.
determines on which outgoing link a packet is to be forwarded.
- B.
forwards a packet to the next free outgoing link.
- C.
Forwards a packet to all outgoing links
- D.
forwards a packet to all outgoing links, except the link upon which the packet originated.
- 4.The Internet is an example of a:
- A.
Packet switched network
- B.
Cell switched network
- C.
Circuit switched network
- D.
None
- 5.Baseband transmission may be defined as the transmission of a signal over a link:
- A.
which is relatively short.
- B.
by means of wires.
- C.
at a different band of frequencies
- D.
without any change in frequency.
- 6..A telephone customarily includes a 4-wire to 2-wire hybrid. The purpose of a hybrid is:
- A.
To combine the signals associated with the microphone and speaker.
- B.
to interconnect the 4 wires of a telephone to a line.
- C.
to merge/separate signals associated with the microphone and speaker.
- D.
None
- 7.Which of the following definitions correctly describes the Dynamic Host Configuration Protocol (DHCP)?
- A.
DHCP enables a NIC to determine the IP address for a given MAC address.
- B.
DHCP is a technique whereby IP addresses are assigned centrally by a server to each host
- C.
DHCP enables a NIC to determine the MAC address for a given IP address
- D.
DHCP is a routing protocol run by routers within a network
- 8.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 symbolic name of a host, given its IP address
- C.
Determine the IP address of a host, given its MAC address
- D.
Determine the MAC address of a host, given its IP address.
- 9.Which data communication method is used to transmit the data over a serial communication link?
- A.
simplex
- B.
half duplex
- C.
full duplex
- D.
None of the above
- 10.What is the minimum number of wires needed to send data over a serial communication link layer?
- A.
1
- B.
2
- C.
4
- D.
6
- 11.Which of the following types of channels moves data relatively slowly?
- A.
Wide band channel
- B.
voice band channel
- C.
narrow band channel
- D.
Broadband channel
- 12.Most data communications involving telegraph lines use:
- A.
Simplex lines
- B.
Wide band channel
- C.
narrow band channel
- D.
dialed service
- 13.A communications device that combines transmissions from several I/O devices into one line is a
- A.
Concentrator
- B.
Modifier
- C.
Full-duplex line
- D.
Multiplexer
- 14.In a synchronous modem, the digital-to-analog converter transmits signal to the
- A.
equalizer
- B.
Modulator
- C.
demodulator
- D.
terminal
- 15.Which of the following communications lines is best suited to interactive processing applications?
- A.
narrow band channel
- B.
Simplex lines
- C.
Full duplex lines
- D.
Mixed band channel
- 16.Why IP Protocol is considered as unreliable
- A.
A packet may be lost
- B.
Packets may arrive out of order
- C.
Duplicate packets may be generated
- D.
All of the above
- 17.What is the minimum header size of an IP Packet?
- A.
16 bytes
- B.
10 bytes
- C.
20 bytes
- D.
32bytes
- 18.Which of following provides reliable communication
- A.
TCP
- B.
IP
- C.
UDP
- D.
All of these
- 19.What is address size of IPV6?
- A.
32 bit
- B.
64 bit
- C.
128 bit
- D.
256 bit
- 20..What is a Firewall in computer network?
- A.
The physical boundary of Network
- B.
An operating system of computer network
- C.
A system designed to prevent unauthorized access
- D.
A web browsing Software
- 21.What does Protocol defines?
- A.
Protocol defines what data is communicated
- B.
Protocol defines how data is communicated
- C.
Protocol defines when data is communicated
- D.
All of these
- 22.What is the uses of sub netting?
- A.
It divides one large network into several smaller ones
- B.
It divides network into network classes
- C.
it speeds up the speed of network
- D.
None of these
- 23.Repeater operates in which layer of the OSI model ?
- A.
Physical layer
- B.
Data link layer
- C.
Network layer
- D.
Transport layer
- 24.IPV4 address is
- A.
8 bit
- B.
16 bit
- C.
32 bit
- D.
64 bit
- 25.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
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