Suppose a host wants to establish the reliability of a link by sending packets and measuring the percentage that is received; routers, for example, do this. Explain the difficulty doing this over a TCP connection.

Potential deadlock and corruption are the correct answer to the given question.

Explanation:

when the Packets  Packets are sent in the network they would not appear across a TCP connection because they are mostly caused by congestion and the potential deadlock.

The potential deadlock will occur when all the buffers on a router carry packets and we have a condition that router doesn't have free buffers, it won't acknowledge extra frames. Unfortunately the potential deadlock will occur The main reason behind that preallocate resources is not allocated also resources going to the waiting state and congestion will occur.  

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