Transport Layer Tasks: -tracks conversations -manages data for many applications -segments data -multiplexes applications

numbering and sequencing -tracks conversations -manages data for many applications -segmentaion -multiplexing

Voice: Daten: vollständig  schnell, < 80ms delay dafür ist TCP geeignet dafür ist UDP geeignet

64-20 bis Byte

TCP Ports UDP Ports Internet Assigned Numbers Authority (IANA)

Port Adressing: -identifies the communicating applications -enables a receiving host to forward the data to the appropriate application -identifies multiple conversations between the hosts

Anmerkung: Microosoft Windows verwendet für Webbrowser Ports im Bereich 1024 bis etwa (Diese „RPC dynamic port allocation“ Einstellungen können geändert werden.)

TCP Connection Termination: netstat –n zeigt als State: TIME_WAIT TCP is connection-oriented ! TCP Connection Establishment: Data Transfer: 3-Way Handshake: initializes the sequence numbers for the session.

The 3-Way Handshake initializes the sequence numbers for the session.

packets will be delivered and reassembled at the destination SourceDestination

Flow Control with Window Size = 10

Only the data in the segments that complete the stream are acknowledged.

Timeout: A host transmits segments and starts a timer. If the acknowledgment is not received before the timer expires, the segments are retransmitted. timeout and resend the data that needs to be acknowledged

Flow Control: to prevent the receiver from being overwhelmed by incoming data,  provided by window size

 connectionless low overhead: