This set of Computer Networks Multiple Choice Questions & Answers (MCQs) focuses on “Mail Access Protocols”.
1. Which mail access protocol is used for sending emails across the internet?
a) POP3
b) SMTP
c) IMAP
d) MAPI
View Answer
Explanation: SMTP is the standard protocol for sending emails across the internet whereas POP3 and IMAP are standard protocols for retrieving emails. MAPI is an interface that helps programs become email aware.
2. POP3 is used to access emails from multiple clients/computers.
a) True
b) False
View Answer
Explanation: POP3 is used to access email from only one client. IMAP is used to simultaneously access email from multiple clients.
3. Which of the following port is used by clients to connect using IMAP securely?
a) 80
b) 143
c) 993
d) 2525
View Answer
Explanation: Port 993 is used by clients to connect using IMAP securely. Port 80 is used by the HTTP protocol, Port 143 is used for non-encrypted IMAP connection and Port 2525 is used by the SMTP protocol.
4. Which of the following is the default POP3 port number?
a) 995
b) 2525
c) 110
d) 143
View Answer
Explanation: Port 110 is the default port for non-encrypted POP3. Port 995 is used for secure connection using POP3, Port 2525 is used by SMTP for non-encrypted connection and Port 143 is used for non-encrypted connection by IMAP.
5. The default port number of SMTP is _________
a) 25
b) 110
c) 2525
d) 143
View Answer
Explanation: The default port number for SMTP is 25. Port 110 and Port 143 are the default port numbers for POP3 and IMAP respectively. Port number 2525 is used by SMTP when port number 25 is filtered out and the client wishes for a non-encrypted connection.
6. POP3 protocol belongs to which layer of the ISO OSI model?
a) Data Link layer
b) Network layer
c) Application layer
d) Transport layer
View Answer
Explanation: POP3 protocol is an application layer protocol used by email clients to retrieve emails. Protocols like MAC, IP, and TCP, work on the Data Link layer, Network layer, and Transport layer respectively.
7. Which mail access protocol is used for accessing email from multiple clients?
a) POP3
b) IMAP
c) SMTP
d) SNMP
View Answer
Explanation: IMAP protocol is used when an email is to be accessed from multiple clients. POP3 is used to provide email access to a single program or client whereas SMTP is used for sending emails. SNMP is used for managing devices on the network.
8. Which port is used for sending messages using SMTP securely?
a) 465
b) 995
c) 110
d) 143
View Answer
Explanation: Port number 465 is used for sending messages using SMTP securely. Port 110 and Port 995 are used by POP3 and Port 143 is the default port number for IMAP.
9. Which protocol forbids users from making any modifications like create, delete or rename emails on the mail server?
a) POP3
b) IMAP
c) MAPI
d) SNMP
View Answer
Explanation: POP3 forbids users from making any modifications to the emails on the email server to ensure that no emails are corrupted. IMAP allows such modifications as it can keep up with the modifications. SMTP and MAPI are used for sending emails and providing an interface for programs to make them email aware respectively.
10. IMAP protocol is used to ___________
a) To manage devices on the network
b) Sending an email through the internet
c) Download the entire email account inbox on the computer
d) Synchronizes email on the computer with the email account’s email-server
View Answer
Explanation: IMAP protocol is used to synchronize email on the computer with the email account’s email-server. SNMP is used for managing network devices, SMTP is used for sending email through the internet, and POP3 is used to download the entire email account inbox on the computer.
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