Computer-Networks
September 8, 2024
Computer-Networks
September 8, 2024
Computer-Networks
September 8, 2024
Computer-Networks
September 8, 2024

Ethernet

Question 2

A router has two full-duplex Ethernet interfaces each operating at 100 Mb/s. Ethernet frames are at least 84 bytes long (including the Preamble and the Inter-Packet-Gap). The maximum packet processing time at the router for wirespeed forwarding to be possible is (in micro­seconds)

A
0.01
B
3.36
C
6.72
D
8
Question 2 Explanation: 
Let’s first calculate transmission time Tt,
Tt = 84×8/10×106 = 6.72μs
But since a router has two full-duplex ethernet interfaces, so the maximum processing time should be,
6.72/2 μs = 3.36μs
Correct Answer: B
Question 2 Explanation: 
Let’s first calculate transmission time Tt,
Tt = 84×8/10×106 = 6.72μs
But since a router has two full-duplex ethernet interfaces, so the maximum processing time should be,
6.72/2 μs = 3.36μs
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