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Summary
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Network and service
Application features and requirements
Network functions
Connection-oriented vs. connection-less
Confirmed vs. unconfirmed
1. Telegraphy and message switching
2. Telephone and circuit switching
3. Computer network and packet switching
summary
• Protocols, services and layers
• OSI seven layer architecture
– Each layer functions
– Provide service by interface (access point)
– End-to-end, point-to-point
• TCP/IP architecture
– IP, TCP, UDP, HTTP, DNS, SMTP
• Data: glue of protocol.
Summary
• ARQ: reliable data service
– SW, GBN,SR
– Mechanisms: timers, retransmission, sequence
number, ack, nak, enq, sliding window
– Window size
– Efficiency: error free or error with p.
– Parameters: propagation, rate, transmission time,
frame length, processing time, round trip time, delaybandwidth product, distance, speed of light.
• End-to-end, hop-by-hop
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Flow control: ON-OFF, sliding window
TCP preview
Framing
PPP
HDLC
CRC