- A. The link between Host1 and Switch1 is down.
- B. Interface Fa0/0 Router1 is shutdown.
- C. TCP/IP is not functioning on Host1.
- D. The link between Router1 and Router2 is down.
- E. The link between Switch1 and Router1 is down.
- F. The default gateway on Host1 is incorrect.
Answer: Option D.
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