Data Communication MCQs | Interview Questions and Answers | Basic Computer Knowledge

1.

Teredo is an automatic tunneling technique. In each client the obfuscated IPv4 address is represented by bits

   A.) 96 to 127
   B.) 0 to 63
   C.) 80 to 95
   D.) 64 to 79

Answer: Option 'A'

96 to 127

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2.

Working of the WAN generally involves?

   A.) ATM
   B.) Satellite
   C.) Frame delay
   D.) All of above

Answer: Option 'D'

All of above

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3.

Which of the following is used for modulation and demodulation?

   A.) Modem
   B.) Multiplexer
   C.) Protocols
   D.) Gateway

Answer: Option 'B'

​Multiplexer

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4.

In file transfer protocol, data transfer can be done in ______

   A.) stream mode
   B.) block mode
   C.) compressed mode
   D.) all of the mentioned

Answer: Option 'D'

all of the mentioned

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5.

What is the other name of a LAN card?

   A.) Modem
   B.) NIC
   C.) Network connector
   D.) Internet card

Answer: Option 'B'

NIC

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6.

In FTP protocol, client contacts server using ____ as the transport protocol.

   A.) transmission control protocol
   B.) user datagram protocol
   C.) datagram congestion control protocol
   D.) stream control transmission protocol

Answer: Option 'A'

transmission control protocol

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7.

Suppose two IPv6 nodes want to interoperate using IPv6 datagrams but are connected to each other by intervening IPv4 routers. The best solution here is

   A.) use dual-stack approach
   B.) No solution
   C.) Tunneling
   D.) Replace the system

Answer: Option 'C'

Tunneling

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8.

These are the features present in IPv4 but not in IPv6.

   A.) Fragmentation
   B.) Header checksum
   C.) Options
   D.) All of the mentioned

Answer: Option 'D'

All of the mentioned

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9.

Which field helps to check rearrangement of the fragments?

   A.) offset
   B.) TTL
   C.) flag
   D.) identifier

Answer: Option 'A'

offset

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10.

If the value in protocol field is 17, the transport layer protocol used is ____

   A.) TCP
   B.) UDP
   C.) Either (a) or (b)
   D.) FTP

Answer: Option 'B'

UDP

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11.

The conditional GET mechanism

   A.) Imposes conditions on the objects to be requested
   B.) Limits the number of response from a server
   C.) Helps to keep a cache upto date
   D.) All of the mentioned

Answer: Option 'C'

​Helps to keep a cache upto date

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12.

Which of the following is present in both an HTTP request line and a status line?

   A.) HTTP version number
   B.) URL
   C.) Method
   D.) All of the mentioned

Answer: Option 'A'

HTTP version number

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13.

Which of the following is not applicable for IP?

   A.) Error reporting
   B.) Handle addressing conventions
   C.) Datagram format
   D.) Packet handling conventions

Answer: Option 'A'

​Error reporting

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14.

Which of the following field in IPv4 datagram is not related to fragmentation?

   A.) Flags
   B.) Offset
   C.) TOS
   D.) Identifier

Answer: Option 'C'

​TOS

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15.

The TTL field has value 10. How many routers (max) can process this datagram?

   A.) 11
   B.) 10
   C.) 15
   D.) 14

Answer: Option 'B'

10

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16.

Fragmentation has following demerits

   A.) complicates routers
   B.) open to DOS attack
   C.) overlapping of fragments
   D.) All of the mentioned

Answer: Option 'D'

All of the mentioned

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17.

In the IPv6 header,the traffic class field is similar to which field in the IPv4 header?

   A.) Fragmentation field
   B.) ToS field
   C.) Fast-switching
   D.) Option field

Answer: Option 'B'

​ToS field

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18.

The header length of an IPv6 datagram is _____.

   A.) 40 bytes
   B.) 20 bytes
   C.) 10 bytes
   D.) 15 bytes

Answer: Option 'A'

​40 bytes

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19.

Which of the following is not correct?

   A.) Web cache does not has its own disk space
   B.) Web cache might reduce the response time
   C.) Web cache can act both like server and client
   D.) Web cache contains copies of recently requested objects

Answer: Option 'A'

Web cache does not has its own disk space

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20.

The HTTP response message leaves out the requested object when _____ method is used

   A.) GET
   B.) HEAD
   C.) POST
   D.) PUT

Answer: Option 'B'

HEAD

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21.

Find the oddly matched HTTP status codes

   A.) 200 OK
   B.) 301 Moved permanently
   C.) 400 Bad Request
   D.) 304 Not Found

Answer: Option 'D'

304 Not Found

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22.

The values GET, POST, HEAD etc are specified in ____ of HTTP message

   A.) Request line
   B.) Status line
   C.) Header line
   D.) Entity line

Answer: Option 'A'

Request line

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23.

The first line of HTTP request message is called ____

   A.) Request line
   B.) Header line
   C.) Status line
   D.) Entity line

Answer: Option 'A'

​Request line

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24.

In the process of fetching a web page from a server the HTTP request/response takes ______ RTTs.

   A.) 1
   B.) 2
   C.) 3
   D.) 4

Answer: Option 'A'

1

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25.

The HTTP request message is sent in ____ part of three-way handshake.

   A.) First
   B.) Second
   C.) Third
   D.) Fourth

Answer: Option 'C'

​Third

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26.

The number of objects in a Web page which consists of 4 jpeg images and HTML text is ______

   A.) 1
   B.) 3
   C.) 5
   D.) 4

Answer: Option 'C'

5

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27.

Find the FTP reply whose message is wrongly matched

   A.) 331 – Username OK, password required
   B.) 425 – Can't open data connection
   C.) 452 – Error writing file
   D.) 452 – Can't open data connection

Answer: Option 'D'

452 – Can't open data connection

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28.

The commands, from client to server, and replies, from server to client, are sent across the control connection in ____ bit ASCII format

   A.) 8
   B.) 7
   C.) 3
   D.) 5

Answer: Option 'B'

7

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29.

If 5 files are transferred from server A to client B in the same session. The number of TCP connection between A and B is

   A.) 2
   B.) 4
   C.) 6
   D.) 10

Answer: Option 'C'

6

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30.

Identify the incorrect statement

   A.) FTP stands for File Transfer Protocol
   B.) FTP sends exactly one file over the data connection
   C.) FTP sends its control information in-band
   D.) FTP uses two parallel TCP connections

Answer: Option 'C'

​FTP sends its control information in-band

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31.

When the sender and the receiver of an email are on different systems, we need only ______ .

   A.) One MTA
   B.) Two UAs
   C.) Two UAs and one pair of MTAs
   D.) Two UAs and two pairs of MTAs

Answer: Option 'D'

Two UAs and two pairs of MTAs

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32.

User agent does not support this

   A.) Composing messages
   B.) Reading messages
   C.) Replying messages
   D.) All of the mentioned

Answer: Option 'D'

All of the mentioned

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33.

What is on-demand mail relay (ODMR)?

   A.) protocol for SMTP security
   B.) an SMTP extension
   C.) protocol for web pages
   D.) all of the mentioned

Answer: Option 'B'

​an SMTP extension

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34.

A SMTP session may include

   A.) zero SMTP transaction
   B.) one SMTP transaction
   C.) more than one SMTP transaction
   D.) all of the mentioned

Answer: Option 'D'

all of the mentioned

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35.

SMTP defines

   A.) message transport
   B.) message encryption
   C.) message content
   D.) all of the mentioned

Answer: Option 'A'

message transport

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36.

In SMTP, the command to write receivers mail address is written with this command

   A.) SEND TO
   B.) MAIL TO
   C.) RCPT TO
   D.) EMAIL FOR

Answer: Option 'C'

​RCPT TO

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37.

Typically the TCP port used by SMTP is

   A.) 25
   B.) 35
   C.) 10
   D.) 15

Answer: Option 'A'

25

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38.

A session may include

   A.) Zero or more SMTP transactions
   B.) Exactly one SMTP transactions
   C.) Always more than one SMTP transactions
   D.) Number of SMTP transactions cannot be determined

Answer: Option 'A'

​Zero or more SMTP transactions

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39.

Which one of the following protocol is used to receive mail messages?

   A.) SMTP
   B.) post office protocol
   C.) internet message access protocol
   D.) all of the mentioned

Answer: Option 'D'

​all of the mentioned

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40.

SMTP uses the TCP port

   A.) 22
   B.) 23
   C.) 25
   D.) 24

Answer: Option 'C'

25

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41.

Simple mail transfer protocol (SMTP) utilizes ____ as the transport layer protocol for electronic mail transfer.

   A.) TCP
   B.) UDP
   C.) DCCP
   D.) SCTP

Answer: Option 'A'

​TCP

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42.

What is DHCP snooping?

   A.) techniques applied to ensure the security of an existing DHCP infrastructure
   B.) encryption of the DHCP server requests
   C.) algorithm for DHCP
   D.) all of the mentioned

Answer: Option 'A'

techniques applied to ensure the security of an existing DHCP infrastructure

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43.

DHCP client and servers on the same subnet communicate via

   A.) UDP broadcast
   B.) UDP unicast
   C.) TCP broadcast
   D.) TCP unicast

Answer: Option 'A'

UDP broadcast

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44.

The DHCP server can provide the _______ of the IP addresses.

   A.) dynamic allocation
   B.) static allocation
   C.) automatic allocation
   D.) all of the mentioned

Answer: Option 'D'

all of the mentioned

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45.

DHCP uses UDP port ____ for sending data to the server.

   A.) 66
   B.) 67
   C.) 68
   D.) 69

Answer: Option 'B'

67

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46.

Voice privacy in GSM cellular telephone protocol is provided by

   A.) b5/4 cipher
   B.) b5/6 cipher
   C.) A5/2 cipher
   D.) b5/8 cipher

Answer: Option 'C'

A5/2 cipher

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47.

IPSec is designed to provide the security at the

   A.) transport layer
   B.) network layer
   C.) application layer
   D.) session layer

Answer: Option 'B'

network layer

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48.

An attempt to make a computer resource unavailable to its intended users is called

   A.) virus attack
   B.) worms attack
   C.) denial-of-service attack
   D.) botnet process

Answer: Option 'C'

​denial-of-service attack

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49.

In tunnel mode IPsec protects the

   A.) entire IP packet
   B.) IP payload
   C.) IP header
   D.) Either b or c

Answer: Option 'A'

entire IP packet

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50.

Pretty good privacy (PGP) is used in

   A.) browser security
   B.) FTP security
   C.) email security
   D.) All of the above

Answer: Option 'C'

​email security

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