1
The transport layer provides
Correct Answer
end-to-end (process-to-process) communication
☑ MCQ PRACTICE
Computer Networks Unit 4
Practice objective questions for quick revision and examination preparation. Try answering each question before revealing the answer.
Computer Networks MCQs - Unit 4
2
Which of the following is a transport service primitive?
Correct Answer
LISTEN
3
A port number is
Correct Answer
16 bits long
4
A socket address consists of
Correct Answer
an IP address and a port number
5
TCP is
Correct Answer
connection-oriented and reliable
6
UDP is
Correct Answer
connectionless and unreliable
7
The TCP three-way handshake consists of
Correct Answer
SYN, SYN+ACK and ACK
8
A TCP connection is released using
Correct Answer
a four-way handshake (FIN and ACK in each direction)
9
The minimum size of the TCP header is
Correct Answer
20 bytes
10
The size of the UDP header is
Correct Answer
8 bytes
11
The UDP header contains
Correct Answer
source port, destination port, length and checksum
12
TCP flow control is done using
Correct Answer
a sliding window advertised by the receiver
13
In TCP slow start, the congestion window grows
Correct Answer
exponentially
14
The well-known port number for DNS is
Correct Answer
53
15
The well-known port number for SMTP is
Correct Answer
25
16
The well-known port number for HTTP is
Correct Answer
80
17
Which application commonly uses UDP?
Correct Answer
DNS queries
18
The problem of delayed duplicate packets during connection establishment is solved by
Correct Answer
the three-way handshake
19
The two-army problem shows that
Correct Answer
reliable agreement over an unreliable channel cannot be guaranteed
20
The retransmission timeout in TCP is based on
Correct Answer
the measured round-trip time
21
Nagle's algorithm is used to
Correct Answer
reduce the number of small segments sent
22
The SYN flag in a TCP segment is used for
Correct Answer
connection establishment
23
Multiplexing at the transport layer means
Correct Answer
several connections can share one network address
24
RTP (Real-time Transport Protocol) typically runs over
Correct Answer
UDP
25
TCP treats data as
Correct Answer
a byte stream with no message boundaries
Fill in the Blanks
26
The unit of data at the transport layer in TCP is the ______.
Correct Answer
segment
27
A port number is ______ bits long.
Correct Answer
16
28
A socket address is the combination of an IP address and a ______ number.
Correct Answer
port
29
The TCP three-way handshake consists of SYN, SYN+ACK and ______.
Correct Answer
ACK
30
The UDP header is ______ bytes long.
Correct Answer
8
31
The minimum size of the TCP header is ______ bytes.
Correct Answer
20
32
TCP flow control uses a sliding ______ advertised by the receiver.
Correct Answer
window
33
In slow start, the congestion window grows ______.
Correct Answer
exponentially
34
The well-known port number of HTTP is ______.
Correct Answer
80
35
The well-known port number of DNS is ______.
Correct Answer
53
36
The well-known port number of SMTP is ______.
Correct Answer
25
37
TCP is ______-oriented and reliable.
Correct Answer
connection
38
UDP stands for ______ Datagram Protocol.
Correct Answer
User
39
TCP stands for ______ Control Protocol.
Correct Answer
Transmission
40
A TCP connection is released using a ______-way handshake.
Correct Answer
four