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Document related concepts
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Transcript 
Application
Transport
Network
Link
Physical
NUS.SOC.CS2105
Ooi Wei Tsang
you are
still here
previously, on
CS2105 …
NUS.SoC.CS2105
Ooi Wei Tsang
techniques for reliabili
1.
2.
3.
4.
5.
NUS.SOC.CS2105
Ooi Wei Tsang
checksum
timer
seq number
ack
nak
NUS.SOC.CS2105
Ooi Wei Tsang
increase range of
sequence
numbers
1.
2. need to buffer more
packets
NUS.SoC.CS2105
Ooi Wei Tsang
Go-Back-N
NUS.SoC.CS2105
Ooi Wei Tsang
NUS.SOC.CS2105
Ooi Wei Tsang
NUS.SOC.CS2105
Ooi Wei Tsang
NUS.SOC.CS2105
Ooi Wei Tsang
Send 1 Packet
NUS.SOC.CS2105
Ooi Wei Tsang
Receive ACK 3
NUS.SOC.CS2105
Ooi Wei Tsang
Receive ACK 6
NUS.SOC.CS2105
Ooi Wei Tsang
Full Window
NUS.SOC.CS2105
Ooi Wei Tsang
Empty Window
NUS.SOC.CS2105
Ooi Wei Tsang
sender
1.
2.
3.
4.
NUS.SOC.CS2105
Ooi Wei Tsang
call from above
receive ACK (ok)
receive ACK (err)
timeout
call from above
NUS.SOC.CS2105
Ooi Wei Tsang
recv ACK (ok)
NUS.SOC.CS2105
Ooi Wei Tsang
recv ACK (err)
NUS.SOC.CS2105
Ooi Wei Tsang
timeout
NUS.SOC.CS2105
Ooi Wei Tsang
receiver
1. recv expected
packets
2. recv unexpected or
corrupted packets
NUS.SOC.CS2105
Ooi Wei Tsang
recv expected
NUS.SOC.CS2105
Ooi Wei Tsang
recv others
NUS.SOC.CS2105
Ooi Wei Tsang
Go-Back-N
NUS.SoC.CS2105
Ooi Wei Tsang
Mid-Term
Test
10 March 2007
LT33
1pm - 2pm
NUS.SoC.CS2105
Ooi Wei Tsang
Make-up
Lecture
10 March 2007
LT33
2pm - 3pm
NUS.SoC.CS2105
Ooi Wei Tsang
Selective
Repeat
NUS.SoC.CS2105
Ooi Wei Tsang
NUS.SOC.CS2105
Ooi Wei Tsang
NUS.SOC.CS2105
Ooi Wei Tsang
sender
receiver
NUS.SOC.CS2105
Ooi Wei Tsang
recv ACK 6
receiver
NUS.SOC.CS2105
Ooi Wei Tsang
sender
recv pkt 8
NUS.SOC.CS2105
Ooi Wei Tsang
recv ACK 3
receiver
NUS.SOC.CS2105
Ooi Wei Tsang
sender
recv pkt 3
NUS.SOC.CS2105
Ooi Wei Tsang
sender
1.
2.
3.
4.
NUS.SOC.CS2105
Ooi Wei Tsang
call from above
receive ACK (ok)
receive ACK (err)
timeout
call from above
NUS.SOC.CS2105
Ooi Wei Tsang
recv ACK (ok)
NUS.SOC.CS2105
Ooi Wei Tsang
recv ACK (err)
NUS.SOC.CS2105
Ooi Wei Tsang
timeout
NUS.SOC.CS2105
Ooi Wei Tsang
receiver
1. recv pkts in window
2. recv pkts before
window
3. recv other packets
NUS.SOC.CS2105
Ooi Wei Tsang
recv pkts in windows
NUS.SOC.CS2105
Ooi Wei Tsang
recv pkts before window
NUS.SOC.CS2105
Ooi Wei Tsang
Sequence
Number
and
Window Size
NUS.SoC.CS2105
Ooi Wei Tsang
NUS.SOC.CS2105
Ooi Wei Tsang
techniques for reliabili
1.
2.
3.
4.
5.
6.
NUS.SOC.CS2105
Ooi Wei Tsang
checksum
timer
seq number
ack
nak
window, pipeline
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