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If there is a single router R1 between a source S and a destination D, then how many times will a packet visit the application layer, network layer and data link layer (including S, R1 and D), respectively?

If there is a single router R1 between a source S and a destination D, then how many times will a packet visit the application layer, network layer and data link layer (including S, R1 and D), respectively? Correct Answer 2, 3, 4

The correct answer is option 2.

Concept:

A router can forward traffic (packets) based on layer 3 information using an IP address.  Layer 3 is the network layer, which is most commonly known as the layer where routing takes place. A router's main job is to get packets from one network to another. Layer 3 protocols and technologies allow for network-to-network communications.

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Source S system has all seven layers of OSI model and Router R has only three layers like Network, datalink, and physical layers. And Destination D system is also all seven layers of the OSI model. And Number of times that layer are used the table given below.

Layers used 
Application 2
Presentation 2
Session 2
Transport 2
Network 3
Data Link 4
Physical 4

Hence the correct answer is 2, 3, 4.

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