CCNA - TCP Retransmission

Author

TCP Retransmission

aznluvsmc

2004-12-14, 11:10 pm

Hi,

According to my Cisco Press book if 4 packets are sent and the second one was received in error, the receiving computer would only ask that packet 2 be resent.

Now, this is contradictory to what I've read in other books where if the second packet was received in error packets 2, 3 and 4 would all need to be resent.

Can someone please clear this up for me? Thanks.

ZacDogg

2004-12-15, 12:10 pm

It is the second way you stated. If a packet is missed, all subsequent packets will need to be retransmitted as well. The concept is called PAR (positive acknowledgement and retransmisson.)

Zac

aznluvsmc

2004-12-15, 5:50 pm

Thanks for the clearup!

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