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1

GATE CSE 2012

MCQ (Single Correct Answer)
Which of the following transport layer protocols is used to support electronic mail?
A
SMTP
B
IP
C
TCP
D
UDP

Explanation

a) SMTP - It is a application layer protocol for sending email.

b) IP - It is a network layer protocol.

c) TCP - It is a connection oriented transport layer protocol.

d) UDP - It is a connectionless transport layer protocol.

SMTP is an application layer protocol used for sending e-mail, it is a connection oriented protocol, therefore it uses TCP at transport layer.

Therefore, SMTP in application layer uses TCP in transport layer for mail services.

2

GATE CSE 2008

MCQ (Single Correct Answer)
Which of the following system calls results in the sending of SYN packets?
A
socket
B
bind
C
listen
D
connect
3

GATE CSE 2008

MCQ (Single Correct Answer)
What is the maximum size of data that the application layer can pass on to the TCP layer below?
A
Any size
B
216 bytes-size of TCP header
C
216 bytes
D
1500 bytes
4

GATE CSE 2005

MCQ (Single Correct Answer)
Packets of the same session may be routed through different paths in
A
TCP, but not UDP
B
TCP and UDP
C
UDP, but not TCP
D
Neither TCP, nor UDP

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