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TCP uses port numbers to identify application services and to multiplex distinct ows between hosts. A more detailed description of TCP features compared to other transport protocols can be found
Sequence Number – used to specify position within the stream Each TCP segment will contain a 32-bit sequence no. to identify its position in the stream
4 dni temu · We are going to explain how these numbers increment and what they mean, how various operating systems handle them in a different manner and lastly, what way these numbers can become a security hazard for those who require a solid secure network.
TCP breaks up the byte stream into packets. Each packet has a sequence number. Why not simply chose 0? What should the timeout be? How to tell the difference between a delayed packet and a lost one? Receiver can only return a single “ack” sequence number to the sender. But: sender only retransmits a single packet. Reason???
TCP delivers all packets to the destination exactly as received at the source. TCP port numbers are related to applications using them. UDP is unreliable transport protocol.
TCP Segments and Sequence Numbers (1/2) • The send() call enqueues data for transmission • Data is split into segments, each placed in a TCP packet, • TCP packets sent in IP packets, when allowed by congestion control algorithm • Each segment has a sequence number • Sequence numbers start from the value sent in the TCP handshake
• If SYN flag is set, this is the initial sequence number. The start of a byte stream; • If SYN flag is clear, this is the accumulated sequence number of the first data byte of this segment for the current session; 8
