Concepts of Layering · Computer Networks · GATE CSE

In the following pairs of OSI protocol layer/sub-layer and its functionality, the INCORRECT pair is

Assume that source S and destination D are connected through two intermediate routers labeled R. Determine how many times each packet has to visit the network layer and the data link layer during a transmission from S to D.

The protocol data unit (PDU) for the application layer in the Internet stack is

Which one of the following is not a client-server application?

Choose the best matching between Group 1 and Group 2 :

Group –1

P. Data link layer
Q. Network layer
R. Transport layer

Group – 2

1. Ensures reliable transport of data over a physical point-to-point link
2. Encodes/decodes data for physical transimission
3. Allows end-to-end communication between two processes
4. Routes data from one network node to the next

The forwarding table of a router is shown below.

Subnet Number	Subnet Mask	Interface ID
200.150.0.0	255.255.0.0	1
200.150.64.0	255.255.224.0	2
200.150.68.0	255.255.255.0	3
200.150.68.64	255.255.255.224	4
Default		0

A packet addressed to a destination address 200.150.68.118 arrives at the router. It will be forwarded to the interface with ID _______________.

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?