本文详细介绍了TCP提供的可靠连接服务，包括其确保数据可靠传输的多种机制，如数据分段、重传、确认应答、排序及避免重复等，并给出了TCP数据包的基本构成。
Q1. What service does TCP provide?
Q2. What is reliability?
Q3. What is TCP data looks like?
1. TCP provides reliable, connection-oriented service.
2. Reliability
- data broken into best size chunks
- data retransmission after timer expires.
- TCP acknowledge data after it receive data
- TCP keep an order of the data
- TCP discards duplicate data
- flow control
3. TCP data=IP header(20 bytes)+TCP header(20 bytes)+TCP data
4. TCP checksum=TCP header+TCP data
IP checksum=IP header
5. option field is the maximum segment size option(MSS), normally specifies this option on the first segment exchanged.
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