1
GATE CSE 2021 Set 2
MCQ (More than One Correct Answer)
+2
-0

Consider a computer network using the distance vector routing algorithm in its network layer. The partial topology of the network is as shown below.

GATE CSE 2021 Set 2 Computer Networks - Network Layer Question 12 English

The objective is to find the shortest-cost path from the router R to routers P and Q. Assume that R does not initially know the shortest routes to P and Q. Assume that R has three neighbouring routers denoted as X, Y, and Z. During one iteration, R measures its distance to its neighbours X, Y, and Z as 3, 2, and 5, respectively. Router R gets routing vectors from its neighbours that indicate that the distance to router P from routers X, Y, and Z are 7, 6, and 5, respectively. The routing vector also indicates that the distance to router Q from routers X, Y, and Z are 4, 6, and 8, respectively. Which of the following statement(s) is/are correct with respect to the new routing table of R, after updation during this iteration ? 

A
The next hop router for a packet from R to P is Y.
B
The distance from R to Q will be stored as 7
C
The next hop router for a packet from R to Q is Z.
D
The distance from R to P will be stored as 10.
2
GATE CSE 2020
MCQ (Single Correct Answer)
+2
-0.67
An organization requires a range of IP addresses to assign one to each of its 1500 computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses CIDR and serves the requests from the available IP address space 202.61.0.0/17. The ISP wants to assign an address space to the organization which will minimize the number of routing entries in the ISP’s router using route aggregation. Which of the following address spaces are potential candidates from which the ISP can allot any one to the organization?

I. 202.61.84.0/21
II. 202.61.104.0/21
III. 202.61.64.0/21
IV. 202.61.144.0/21
A
I and II only
B
II and III only
C
III and IV only
D
I and IV only
3
GATE CSE 2019
MCQ (Single Correct Answer)
+2
-0.67

Consider three machines M, N, and P with IP addresses 100.10.5.2, 100.10.5.5, and 100.10.5.6 respectively. The subnet mask is set to 255.255 .255 .252 for all the three machines. Which one of the following is true?

A
$\mathrm{M}, \mathrm{N}$, and P all belong to the same subnet
B
Only M and N belong to the same subnet
C
Only N and P belong to the same subnet
D
M, N, and P belong to three different subnets
4
GATE CSE 2019
MCQ (Single Correct Answer)
+2
-0.67

Suppose that in an IP-over-Ethernet network, a machine X wishes to find the MAC address of another machine Y in its subnet. Which one of the following techniques can be used for this?

A
X sends an ARP request packet to the local gateway's IP address which then finds the MAC address of Y and sends to X
B
X sends an ARP request packet to the local gateway's MAC address which then finds the MAC address of Y and sends to X
C
X sends an ARP request packet with broadcast MAC address in its local subnet
D
X sends an ARP request packet with broadcast IP address in its local subnet
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