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GATE Previous Subject Wise Questions
Data Structures
Algorithms
operating systems
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Computer Networks
DBMS
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Question 1
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Computer Networks
gate 2018
Question 2
An IP datagram of size 1000 bytes arrives at a router. The router has to forward this packet ona link whose MTU (maximum transmission unit) is 100 bytes. Assume that the size of the IP
header is 20 bytes.
The number of fragments that the IP datagram will be divided into for transmission is______________
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Computer Networks
gate 2016 set 1
Question 3
For a host machine that uses the token bucket algorithm for congestion control, the tokenbucket has a capacity of 1 megabyte and the maximum output rate is 20 megabytes per second.
Tokens arrive at a rate to sustain output at a rate of 10 megabytes per second. The token bucket
is currently full and the machine needs to send 12 megabytes of data. The minimum time
required to transmit the data is ______________ seconds.
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Computer Networks
gate 2016 set 1
Question 4
A sender uses the Stop-and-Wait ARQ protocol for reliable transmission of frames. Framesare of size 1000 bytes and the transmission rate at the sender is 80 Kbps (1Kbps = 1000
bits/second). Size of an acknowledgement is 100 bytes and the transmission rate at the receiver
is 8 Kbps. The one-way propagation delay is 100 milliseconds.
Assuming no frame is lost, the sender throughput is _______________ bytes/second.
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Computer Networks
gate 2016 set 1
Question 5
Anarkali digitally signs a message and sends it to Salim. Verification of the signature by Salimrequires
A
Anarkali’s public key.
B
Salim’s public key.
C
Salim’s private key.
D
Anarkali’s private key.
Computer Networks
gate 2016
Question 6
In an Ethernet local area network, which one of the following statements 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.
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
retransmissions.
retransmissions.
Computer Networks
gate 2016
Question 7
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Computer Networks
gate 2016
Question 8
Note: 802.11 MAC = Wifi
I. This is true, maximum 3 overlapping channels are possible in Wifi.
II. The RTS (Request To Send) and CTS(Clear To Send) are control frames which is used for collision avoidance, not in collision detection, (so, II is False)
III. Every frame in Wifi is Acked, because Wifi stations do not use collusion detection. (True)
I. This is true, maximum 3 overlapping channels are possible in Wifi.
II. The RTS (Request To Send) and CTS(Clear To Send) are control frames which is used for collision avoidance, not in collision detection, (so, II is False)
III. Every frame in Wifi is Acked, because Wifi stations do not use collusion detection. (True)
A
All I, II, and III
B
I and III only
C
II and III only
D
II only
Computer Networks
gate 2016
Question 9
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Computer Networks
gate 2016
Question 10
Consider a TCP client and a TCP server running on two different machines. After completing data transfer, the TCP client calls close to terminate the connection and a FIN segment is sent to the TCP server. Server-side TCP responds by sending an ACK which is received by the client-side TCP. As per the TCP connection state diagram(RFC 793), in which state does the client side TCP connection wait for the FIN from the server-side TCP?
A
LAST-ACK
B
TIME-WAIT
C
FIN-WAIT-1
D
FIN-WAIT-2
Computer Networks
GATE 2017 SET 1
Question 11
A sender S sends a message m to receiver R, which is digitally signed by S with its private key. In this scenario, one or more of the following security violations can take place.(I) S can launch a birthday attack to replace m with a fraudulent message.
(II) A third party attacker can launch a birthday attack to replace m with a fraudulent message.
(III) R can launch a birthday attack to replace m with a fraudulent message.
A
(I) and (II) only
B
(I) only
C
(II) only
D
(II) and (III) only
Computer Networks
GATE 2017 SET 1
Question 12
In a RSA cryptosystem a particular A uses two prime numbers p = 13 and q =17 to generate her public and private keys. If the public key of Ais 35. Then the private key of A is ____________.
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Computer Networks
GATE 2017 SET 1
Question 13
The values of parameters for the Stop-and – Wait ARQ protocol are as given below.Bit rate of the transmission channel = 1Mbps Propagation delay from sender to receiver = 0.75 ms Time to process a frame = 0.25ms Number of bytes in the information frame = 1980 Number of bytes in the acknowledge frame = 20 Number of overhead bytes in the information frame = 20Assume that there are no transmission errors. Then the transmission efficiency ( expressed in percentage) of the Stop-and – Wait ARQ protocol for the above parameters is _________( correct to 2 decimal place) .
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Computer Networks
GATE 2017 SET 1
Question 14
Consider the following statements about the routing protocols, Routing Information Protocol(RIP) and Open Shortest Path First(OSPF) in an IPv4 network.I. RIP uses distance vector routing
II. RIP packets are sent using UDP
III. OSPF packets are sent using TCP
IV. OSPF operation is based on link-state routing
Which of the following above are CORRECT?
A
I and IV only
B
I, II and III only
C
I, II and IV only
D
II, III and IV only
Computer Networks
GATE 2017 SET2
Question 15
The maximum number of IPv4 router address addresses that can be listed in the record route (RR) option field of an IPv4 header is ____.
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Computer Networks
GATE 2017 SET2
Question 16
Consider a socket API on Linux machine that supports UDP socket. A connected UDP socket is a UDP socket on which connect function has already been called. Which of the following statements is/are correct ?
I. A connected UDP socket can be used to communicate
with multiple peers simultaneously.
II. A process can successfully call connect function
again for an already connected UDP socket.
A
I only
B
II only
C
Both I and II only
D
Neither I nor II
Computer Networks
GATE 2017 SET2
Question 17
Suppose two hosts use a TCP connection to transfer a large file. Which of the following statementsis/are FALSE with respect to the TCP connection?
I. If the sequence number of a segment is m, then the sequence number of the subsequent
segment is always m+1.
II. If the estimated round trip time at any given point of time is t sec, the value of the
retransmission timeout is always set to greater than or equal to t sec.
III. The size of the advertised window never changes during the course of the TCP connection.
IV. The number of unacknowledged bytes at the sender is always less than or equal to the
advertised window.
A
III only
B
I and III only
C
I and IV only
D
II and IV only
Computer Networks
GATE 2015 SET 1
Question 18
Which one of the following fields of an IP header is NOT modified by a typical IP router?
A
Checksum
B
Source address
C
Time to Live (TTL)
D
Length
Computer Networks
GATE 2015 SET 1
Question 19
Suppose that the stop-and-wait protocol is used on a link with a bit rate of 64 kilobits per secondand 20 milliseconds propagation delay. Assume that the transmission time for the
acknowledgement and the processing time at nodes are negligible. Then the minimum frame size in
bytes to achieve a link utilization of at least 50% is______________.
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Computer Networks
GATE 2015 SET 1
Question 20
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Computer Networks
GATE 2015 SET 1
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