1
GATE CSE 2022
Numerical
+1
-0.33

Consider the resolution of the domain name www.gate.org.in by a DNS resolver. Assume that no resource records are cached anywhere across the DNS servers and that iterative query mechanism is used in the resolution. The number of DNS query-response pairs involved in completely resolving the domain name is __________.

2
GATE CSE 2022
MCQ (More than One Correct Answer)
+1
-0.33

Consider routing table of an organization's router shown below:

Subnet number Subnet mask Next hop
12.20.164.0 255.255.252.0 R1
12.20.170.0 255.255.254.0 R2
12.20.168.0 255.255.254.0 Interface 0
12.20.166.0 255.255.254.0 Interface 1
default R3

Which of the following prefixes in CIDR notation can be collectively used to correctly aggregate all of the subnets in the routing table?

A
12.20.164.0/20
B
12.20.164.0/22
C
12.20.164.0/21
D
12.20.168.0/22
3
GATE CSE 2022
Numerical
+1
-0.33

Consider a network with three routers P, Q, R shown in the figure below. All the links have cost of unity.

The routers exchange distance vector routing information and have converged on the routing tables, after which the link Q-R fails. Assume that P and Q send out routing updates at random times, each at the same average rate. The probability of a routing loop formation (rounded off to one decimal place) between P and Q, leading to count-to-infinity problem, is _____________

4
GATE CSE 2022
Numerical
+1
-0.33

Consider a 100 Mbps link between an earth station (sender) and a satellite (receiver) at an altitude of 2100 km. The signal propagates at a speed of 3 $$\times$$ 108 m/s. The time taken (in milliseconds, rounded off to two decimal places) for the receiver to completely receive a packet of 1000 bytes transmitted by the sender is _____________.

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