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1

GATE CSE 2012

MCQ (Single Correct Answer)
In the IPv4 addressing format, the number of networks allowed under Class C addresses is
A
214
B
27
C
221
D
224

Explanation

For class C address, size of network id is 24 bits. But first 3 bits are fixed as 110 so we can use only (24 - 3) = 21 bits to create networks; hence total number of networks possible is 221.
2

GATE CSE 2010

MCQ (Single Correct Answer)
One of the header fields in an IP datagram is the Time to Live (TTL) field. Which of the following statements best explains the need for this field?
A
It can be used to prioritize packets
B
It can be used to reduce delays
C
It can be used to optimize throughput
D
It can be used to prevent packet looping
3

GATE CSE 2006

MCQ (Single Correct Answer)
For which one of the following reasons does Internet Protocol (IP) use the time-to-live (TTL) field in the IP datagram header?
A
Ensure packets reach destination within that time
B
Discard packets that reach later than that time
C
Prevent packets from looping indefinitely
D
Limit the time for which a packet gets queued in intermediate routers.
4

GATE CSE 2005

MCQ (Single Correct Answer)
The address resolution protocol (ARP) is used for
A
Finding the IP address from the DNS
B
Finding the IP address of the default gateway
C
Finding the IP address that corresponds to a MAC address
D
Finding the MAC address that corresponds to an IP address

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Class 12