1
GATE CSE 2014 Set 3
Numerical
+2
-0
Every host in an IPv4 network has a 1-second resolution real-time clock with battery backup. Each host needs to generate up to 1000 unique identifiers per second. Assume that each host has a globally unique IPv4 address. Design a 50-bit globally unique ID for this purpose. After what period (in seconds) will the identifiers generated by a host wrap around?
Your input ____
2
GATE CSE 2014 Set 2
MCQ (Single Correct Answer)
+2
-0.6
An IP machine Q has a path to another IP machine H via three IP routers R1, R2, and R3.

Q—R1—R2—R3—H

H acts as an HTTP server, and Q connects to H via HTTP and downloads a file. Session layer encryption is used, with DES as the shared key encryption protocol. Consider the following four pieces of information:

$$[I1]$$ The URL of the file downloaded by Q
$$[I2]$$ The TCP port numbers at Q and H
$$[I3]$$ The IP addresses of Q and H
$$[I4]$$ The link layer addresses of Q and H

Which of $$[I1]$$, $$[I2]$$, $$[I3]$$, and $$[I4]$$ can an intruder learn through sniffing at R2 alone?
A
Only $$[I1]$$ and $$[I2]$$
B
Only $$[I1]$$
C
Only $$[I2]$$ and $$[I3]$$
D
Only $$[I3]$$ and $$[I4]$$
3
GATE CSE 2013
MCQ (Single Correct Answer)
+2
-0.6
In an IPv4 datagram, the M bit is 0, the value of HLEN is 10, the value of total length is 400 and the fragment offset value is 300. The position of the datagram, the sequence numbers of the first and the last bytes of the payload, respectively are
A
Last fragment, 2400 and 2789
B
First fragment, 2400 and 2759
C
Last fragment, 2400 and 2759
D
Middle fragment, 300 and 689
4
GATE CSE 2012
MCQ (Single Correct Answer)
+2
-0.6
An Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: 245.248.128.0/20.
The ISP wants to give half of this chunk of addresses to Organization A, and a quarter to Organization B, while retaining the remaining with itself. Which of the following is a valid allocation of address to A and B?
A
245.248.136.0/21 and 245.248.128.0/22
B
245.248.128.0/21 and 245.248.128.0/22
C
245.248.132.0/22 and 245.248.132.0/21
D
245.248.136.0/24 and 245.248.132.0/21
GATE CSE Subjects
Software Engineering
Web Technologies
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NEETAIIMS
Graduate Aptitude Test in Engineering
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Civil Services
UPSC Civil Service
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Class 12