tailieunhanh - windows server 2008 tcp ip protocols and services microsoft 2008 phần 6

Sau khi RTO số giây, khi hết hạn RTO, RTO phân khúc được thiết lập để RTO hai lần cho truyền trước đây của phân khúc và truyền lại. Bước 2 được lặp lại cho số lượng tối đa của truyền lại trước khi kết nối TCP là bị bỏ rơi. Giá trị registry | Chapter 11 Transmission Control Protocol TCP Connections In this chapter The TCP TCP Connection TCP Half-Open TCP Connection TCP Connection TCP Connection TCP Connection TCP is a connection-based protocol. Before data can flow on a TCP connection the connection must be formally established through a handshake process. To gracefully stop the flow of data on a TCP connection and release the resources of the connection it must be terminated through a similar handshake process. This chapter describes the details of TCP connection establishment and termination and the states of a TCP connection. The TCP Connection A TCP connection is a bidirectional full-duplex logical circuit between two processes Application Layer protocols in an IP internetwork. The TCP connection s endpoints are identified by an IP address TCP port pair. The connection is uniquely identified by both endpoints IP address 1 TCP port 1 IP address 2 TCP port 2 . TCP uses those four numbers to demultiplex the data portion of the TCP segment to the proper Application Layer process. A TCP connection can be visualized as a bidirectional data pipe containing two logical pipes between the two TCP peers as Figure 11-1 illustrates. One logical pipe is used for outbound data and the other logical pipe is used for inbound data relative to the TCP peer . The outbound data pipe for one TCP peer is the inbound data pipe for the other TCP peer. 223 224 Part III Transport Layer Protocols TCP HnOiitboiind j Inbound in TCP Peer z Peer 1 ụỵ Inbound iQutboundjf I 2 Figure 11-1 A TCP connection showing both inbound and outbound logical pipes TCP connections are Established through a handshake process in which both TCP peers agree to create a TCP connection. Optionally maintained through a periodic keepalive process that ensures that both TCP peers are active on the connection. Terminated through a handshake .