Assume that source S and destination D are connected through two routers. Also there exists a gateway between these two routers. Let x be the number of times a packet visits transport layer, y be the number of times a packet visits network layer and z be the number of times a packet visits data link layer during transmission from source to destination. Then calculate x+2y+3z = __________Correct answer is '39'. Can you explain this answer?

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Assume that source S and destination D are connected through two routers. Also there exists a gateway between these two routers. Let 'x' be the number of times a packet visits transport layer, 'y' be the number of times a packet visits network layer and 'z' be the number of times a packet visits data link layer during transmission from source to destination. Then calculate x+2y+3z = __________

Correct answer is '39'. Can you explain this answer?

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Assume that source S and destination D are connected through two route...

At source , packet visits all the layer once before getting transmitted.

At router R1 , it will go upto the network layer because router is a networking device.

At gateway G1 , it will go upto transport layer because gateway is an all layer switch who works on transport layer.

At router R2 , it will go upto network layer.

At destination , packet will once again visit all the layers.

Hence

A - Application Layer

P - Presentation Layer

S - Session Layer

T - Transport Layer

N - Network Layer

D - Data Link Layer

P - Physical Layer

Hence , from figure

x = 3 y= 6 z = 8

so, x + 2y + 3z = 3 + 12 + 24 = 39

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