IP SANs: A Guide to iSCSI, iFCP, and FCIP Protocols for Storage Area Networks

7.2. Chapter Summary

TCP

• TCP is a connection-oriented transport protocol.

• TCP initializes a connection between two hosts before data is transferred.

• Data is acknowledged by the recipient.

• TCP provides error recovery and reordering of out-of-sequence segments.

• The TCP/IP stack is CPU intensive for the host system.

TCP Header

• The TCP header is typically 20 bytes in length.

• Source and destination port numbers are used to communicate with specific upper layer applications.

• The ACK flag in the TCP header indicates that acknowledgment numbers are valid.

• The SYN bit is set when a TCP connection is initialized.

• The finish bit is used to tear down a TCP connection when data transfer is complete.

Establishing TCP Connections

• TCP connection establishment is a three-way ...