This set of MCQ questions on the application layer in OSI and TCP/IP model includes the collections of multiple-choice questions on the application layer and their applications.
1) Which of the following is/are the important applications of the application layer?
A. Electronic mail
B. World Wide Web
C. USENET
D. All of the above
2) The TCP/IP …………. corresponds to the combined session, presentation, and application layers of the OSI model.
A. session layer
B. the presentation layer
C. application layer
D. None of the above
3) The ………. protocol is based on end-to-end delivery.
A. SMTP
B. TCP
C. IP
D. SCTP
4) The well-known port of the SMTP server is ……..
A. 110
B. 25
C. 50
D. 20
5) In the SMTP header field, …………. is a summary of the message being sent which is specified by the sender.
A. Reply-to
B. Return-path
C. Subject
D. From
6) In the SMTP herder field, ………. is added by the final transport system that delivers the mail.
A. Reply-to
B. Return-path
C. Subject
D. From
7) In SMTP mail transaction flow, the sender SMTP establishes a TCP connection with the destination SMTP and then waits for the server to send a ……….
A. 220 service ready message
B. 421 service not available message
C. Both of the above
D. None of the above
8) In SMTP mail transaction flow, ………. is sent, to which the receiver will identify itself by sending back its domain name.
A. HELO
B. MAIL FROM
C. RCPT TO
D. DATA
9) ………… is a command-line tool designed for most UNIX-like operating systems, which does not define a method of transferring mail, but rather acts as a client/server that supports multiple mail protocols.
A. Receive mail
B. Sendmail
C. MIME
D. POP
10) Which of the following is/are the components of Sendmail?
A. Mail user agent(MUA)
B. Mail transfer agent(MTA)
C. Mail delivery agent(MDA)
D. All of the above
11) The ………… is the interface through which a user can read and send mail.
A. Mail user agent(MUA)
B. Mail transfer agent(MTA)
C. Mail delivery agent(MDA)
D. Mail send agent(MSA)
12) The ………… acts like a mail router, accepting messages from both MTAs and MUAs.
A. Mail user agent(MUA)
B. Mail transfer agent(MTA)
C. Mail delivery agent(MDA)
D. Mail send agent(MSA)
13) ………. uses a queuing system to manage inbound and outbound mail.
A. Receive mail
B. Sendmail
C. MIME
D. POP
14) The sender SMTP establishes a TCP connection with the destination SMTP and then waits for the server to send a …… service ready message.
A. 421
B. 320
C. 220
D. 120
15) ………… is limited to 7-bit ASCII text, with a maximum line length of 1000 characters.
A. SMTP
B. MIME
C. POP
D. MTA
16) A ……….. message is one which can be routed through any number of networks that are loosely compliant with RFC2821 or are capable of transmitting RFC2821 messages.
A. SMTP
B. MIME
C. POP
D. MTA
17) There are ……. the number of standard content types in MIME.
A. 5
B. 7
C. 9
D. 4
18) In the MIME header field, ……… describes how the object within the body is to be interpreted.
A. content-type
B. content-transfer-encoding
C. content-description
D. content-id
19) In the MIME header field, ………… describes how the object within the body was encoded in order that it be included in the message using a mail-safe form.
A. content-type
B. content-transfer-encoding
C. content-description
D. content-id
20) In a/an ………… of DNS resolver, the queried name server can return the best answer it currently has back to the DNS resolver.
A. Recursive queries
B. Iterative queries
C. Reverse queries
D. Inverse queries
Answers:
1) D. All of the above
2) C. application layer
3) A. SMTP
4) B. 25
5) C. Subject
6) B. Return-path
7) C. Both of the above
8) A. HELO
9) B. Sendmail
10) D. All of the above
11) A. Mail user agent(MUA)
12) B. Mail transfer agent(MTA)
13) B. Sendmail
14) C. 220
15) A. SMTP
16) B. MIME
17) B. 7
18) A. content-type
19) B. content-transfer-encoding
20) B. Iterative queries
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