In a TCP session hijacking attack, if the server is waiting for data starting from sequence number X, but we used X 100 in our attack packet. Will our attack succeed or fail

In the presence of packets transfer between client and server in a TCP session, the attack will be successful if the number of the sequence is approximately X+100. Otherwise, the attack will not be successful (i.e. fail).

Explanation:

Generally, it is important to ensure that there is a successful operation in the operation of a TCP session. In the presence of packets transfer between client and server in a TCP session, the attack will be successful if the number of the sequence is approximately X+100. Otherwise, the attack will not be successful (i.e. fail).

Yes

Explanation:

The TCP communication between client and server is reliable, connection oriented and sequentially numbers transfered packets. The sequence number is used to rearrange packets at the destination since TCP protocol propagates packets on different channels, which would stop the sequential arrival of packets.

A destination in a TCP transmission would accept and store any packet with sequence number, before rearranging.