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what range of sequence numbers should a packet, sent by the client fall in order to be accepted by the server?

You want to carry out session hijacking on a remote server. The server and the client are communicating via TCP after a successful TCP three way handshake. The server has just received packet #120 from the client. The client has a receive window of 200 and the server has a receive window of 250.

Within what range of sequence numbers should a packet, sent by the client fall in order to be accepted by the server?

What kind of attack is being illustrated here?

Jack Hackers wants to break into Brown’s Computers and obtain their secret double fudge cookie recipe. Jack calls Jane, an accountant at Brown Co. pretending to be an administrator from Brown Co. Jack tell Jane that there has been a problem with some accounts and asks her to verify her password with him "just to double check our records". Jane does not suspect anything amiss and parts her password. Jack can now access Brown Co.’s computer with a valid username and password to steal the cookie recipe. What kind of attack is being illustrated here?


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