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TCP Retransmission
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aznluvsmc
Just a kid
M
Registered: Mar 2003
Location: Newmarket
Country: Canada
State:
Certifications: 3yr college networking diploma, MCSE, A+, Network+, Server+, i-Net+, Security+
Working on: Working on 3yr college programming diploma
Total Posts: 490
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 TCP Retransmission
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.
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 12-15-04 04:10 AM
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ZacDogg
Senior Member
M
Registered: Mar 2002
Location: Minneapolis
Country: United States
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Certifications: A+, Net+, CCNA, CCNP, CCIE, CSS-1
Working on: another CCIE
Total Posts: 227
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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
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12-15-04 05:10 PM
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aznluvsmc
Just a kid
M
Registered: Mar 2003
Location: Newmarket
Country: Canada
State:
Certifications: 3yr college networking diploma, MCSE, A+, Network+, Server+, i-Net+, Security+
Working on: Working on 3yr college programming diploma
Total Posts: 490
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12-15-04 10:50 PM
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