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Assume that Source $S$ and Destination $D$ are connected through an intermediate router $R.$
How many times a packet has to visit the network layer and data link layer during a transmission from $S$ to $D$ ?

  1. Network layer$-4$ times, Data link layer$-4$ times
  2. Network layer$-4$ times, Data link layer$-6$ times
  3. Network layer$-2$ times, Data link layer$-4$ times
  4. Network layer$-3$ times, Data link layer$-4$ times
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The connection asked in the question is simply illustrated as in the picture

Answer is quite clear!

D) Network layer−3− times, Data link layer−4− times

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