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if a router connects three links then router will be invlolved :
N/W layer : 4
DLL : 6
Physical Layer: 6


PS: There are 3 links in above mentioned figure: A -B, B - E, E - F

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Network layer-:$4$

Data link-:$6$

Physical-:$6$.

almost similar to this

https://gateoverflow.in/1436/gate2013_14

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