Computer Network Question Paper with Solution
MCQ TYPE QUESTION
2016
Question 1) Which one of the following protocols is NOT use to resolve one from of address to another one?
a) DNS
b) ARP
c) DHCP
d) RARP
Answer:- a
Explanation:-
In DNS (mapping of IP address & URL)
IP address URL
197.12.05 www.abc.com
Question 2) Which of the following is/are example(s) of stateful application layer protocols?
i) HTTP ii) FTP iii) TCP iv) POP3
a) (i) and (ii) only
b) (ii) and (iii) only
c) (ii) and (iv)
d) (iv) only
Answer:- c
Explanation:- FTP and POP3 are non-HTTP protocols
These are stateful application layer protocols.
Question 3.) In an Ethernet local area network which one of the following statement is TRUE?
a) A station stops to sense the channel once it starts transmitting a frame.
b) The purpose of the jamming signal is to pad the frames that are smaller than the minimum frame size
c) A station continues to transmit the packet even after the collision is detected
d) The exponential backoff mechanism reduces the probability of collision on re transmissions.
Answer:- d
Explanation:- According to the concept of binary exponential backoff algorithm the exponential backoff mechanism reduces the .probability of collision on re transmissions.
Question 4.) Identify the correct sequence in which the following packets are transmitted on the network by a host when a browser requests a webpage from a remote server , assuming that the host just been restarted.
a) HTTP GET request , DNS query, TCP SYN
b) DNS query, HTTP GET request TCP SYN
c) DNS query, TCP SYN, HTTP GET request
d) TCP SYN, DNS query , HTTP GET request
Answer:- c
Explanation:- These are following steps in which packets are transmitted on the network by a host when a browser request a webpage from a remote server :
Step 1 : The client (browser) initiates a DNS query for remote server.It may be that they already have the server in their may simply send a TCP SYN directly to the application server.
Step 2: The client will next send a connection request to the application server.This is will be a TCP SYN packet,the first in the TCP three-way handshake.
Step 3: Next,after the TCP connection has been established, the client will request data from the server.In the web-based application, the client perform an HTTP GET.
Question 5.) For the IEE 802.11 MAC protocol for wireless communication, which of the following statements is/are TRUE?
I. At least three non-overlapping channels are available for transmissions.
II. The RTS-CTS mechanism is used for collision detection.
III. Unicast frames are ACKed.
a) All I,II and III
b) I and III only
c) II and III only
d) II only
Answer:- b
Explanation:- In case of IEE 802.11 MAC protocols for wireless communication RTS and CTS mechanism is used for collision avoidance, not for collision detection.
2016
Question 1) Which one of the following protocols is NOT use to resolve one from of address to another one?
a) DNS
b) ARP
c) DHCP
d) RARP
Answer:- a
Explanation:-
In DNS (mapping of IP address & URL)
IP address URL
197.12.05 www.abc.com
Question 2) Which of the following is/are example(s) of stateful application layer protocols?
i) HTTP ii) FTP iii) TCP iv) POP3
a) (i) and (ii) only
b) (ii) and (iii) only
c) (ii) and (iv)
d) (iv) only
Answer:- c
Explanation:- FTP and POP3 are non-HTTP protocols
These are stateful application layer protocols.
Question 3.) In an Ethernet local area network which one of the following statement is TRUE?
a) A station stops to sense the channel once it starts transmitting a frame.
b) The purpose of the jamming signal is to pad the frames that are smaller than the minimum frame size
c) A station continues to transmit the packet even after the collision is detected
d) The exponential backoff mechanism reduces the probability of collision on re transmissions.
Answer:- d
Explanation:- According to the concept of binary exponential backoff algorithm the exponential backoff mechanism reduces the .probability of collision on re transmissions.
Question 4.) Identify the correct sequence in which the following packets are transmitted on the network by a host when a browser requests a webpage from a remote server , assuming that the host just been restarted.
a) HTTP GET request , DNS query, TCP SYN
b) DNS query, HTTP GET request TCP SYN
c) DNS query, TCP SYN, HTTP GET request
d) TCP SYN, DNS query , HTTP GET request
Answer:- c
Explanation:- These are following steps in which packets are transmitted on the network by a host when a browser request a webpage from a remote server :
Step 1 : The client (browser) initiates a DNS query for remote server.It may be that they already have the server in their may simply send a TCP SYN directly to the application server.
Step 2: The client will next send a connection request to the application server.This is will be a TCP SYN packet,the first in the TCP three-way handshake.
Step 3: Next,after the TCP connection has been established, the client will request data from the server.In the web-based application, the client perform an HTTP GET.
Question 5.) For the IEE 802.11 MAC protocol for wireless communication, which of the following statements is/are TRUE?
I. At least three non-overlapping channels are available for transmissions.
II. The RTS-CTS mechanism is used for collision detection.
III. Unicast frames are ACKed.
a) All I,II and III
b) I and III only
c) II and III only
d) II only
Answer:- b
Explanation:- In case of IEE 802.11 MAC protocols for wireless communication RTS and CTS mechanism is used for collision avoidance, not for collision detection.
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