Computer Networking Quiz (or) Computer Networking MCQ (Multiple Choice Questions)

1 .

The password is sent to the server using ________ command.

A)

PASS

B)

PWORD

C)

PASSWD

D)

PASSWORD

Correct Answer : Option (A) : PASS

Explanation : The PASS command, preceded by the username, completes the user’s identification for access control in an FTP session. Without the valid password, the user won’t be able to initiate the FTP connection.

2 .

When the mail server sends mail to other mail servers it becomes ________

A)

Peer

B)

Master

C)

SMTP client

D)

SMTP server

Correct Answer : Option (C) : SMTP client

Explanation : SMTP clients are the entities that send mails to other mail servers. The SMTP servers cannot send independent mails to other SMTP servers as an SMTP server. There are no masters or peers in SMTP as it is based on the client-server architecture.

3 .

Expansion of SMTP is ______

A)

Simple Mail Transmission Protocol

B)

Simple Message Transfer Protocol

C)

Simple Mail Transfer Protocol

D)

Simple Message Transmission Protocol

Correct Answer : Option (C) : Simple Mail Transfer Protocol

Explanation : SMTP or Simple Mail Transfer Protocol is an application layer protocol used to transport e-mails over the Internet. Only 7-bit ASCII codes can be sent using SMTP.

4 .

In SMTP, the command to write receiver’s mail address is written with the command _______

A)

MAIL TO

B)

RCPT TO

C)

SEND TO

D)

RCVR TO

Correct Answer : Option (B) : RCPT TO

Explanation : RCPT TO command is followed by the recipient’s mail address to specify where or to whom the mail is going to through the internet. If there is more than one receiver, the command is repeated for each address continually.

5 .

Internet mail places each object in _________

A)

One message

B)

Varies with number of objects

C)

Multiple messages for each object

D)

Separate messages for each object

Correct Answer : Option (A) : One message

Explanation : It places all objects into one message as it wouldn’t be efficient enough if there are different messages for each object. The objects include the text and all the multimedia to be sent.

6 .

Typically the TCP port used by SMTP is ______

A)

50

B)

45

C)

35

D)

25

Correct Answer : Option (D) : 25

Explanation : The ports 15, 35 and 50 are all UDP ports and SMTP only uses TCP port 25 for reliability.

7 .

Which of the following is an example of user agents for e-mail?

A)

Tumblr

B)

Google

C)

Facebook

D)

Microsoft Outlook

Correct Answer : Option (D) : Microsoft Outlook

Explanation : Among the options, only Microsoft Outlook is an e-mail agent. Google is a search engine and Facebook, and Tumblr are social networking platforms. Gmail and Alpine are some other examples of e-mail agent.

8 .

The entire hostname has a maximum of ______

A)

31 characters

B)

63 characters

C)

255 characters

D)

127 characters

Correct Answer : Option (C) : 255 characters

Explanation : An entire hostname can have a maximum of 255 characters. Although each label must be from 1 to 63 characters long. Host name is actually a label that is given to a device in a network.

9 .

A DNS client is called _______

A)

DNS handler

B)

DNS resolver

C)

DNS updater

D)

None of the above

Correct Answer : Option (B) : DNS resolver

Explanation : DNS client also known as DNS resolver also known as DNS lookup helps to resolve DNS requests using an external DNS server.

10 .

Servers handle requests for other domains _______

A)

directly

B)

it is not possible

C)

Both (A) and (B)

D)

by contacting remote DNS server

Correct Answer : Option (D) : by contacting remote DNS server

Explanation : Whenever a request is received at server from other domains, it handles this situation by contacting remote DNS server.