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Which of B, C, D can A reach

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Please see attached file for graph. Here is the question:

A site is shown in Figure 4.57. R1 and R2 are routers; R2 connects to the outside world. Individual LANs are Ethernets. RB is a bridge router; it routes traffic addressed to it and acts as a bridge for other traffic. Subnetting is used inside the site; ARP is used on each subnet. Unfortunately, host A has been misconfigured and doesn't use subnets. Which of B, C, D can A reach?

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This solution helps with a problem involving programming languages.

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A can only reach B.

Since subnetting is not used, then A cannot reach R1 and R2 since RB ...

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