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Tag Archives | tcp

TCP and UDP Services and Ports

TPC 22: SSH TCP 23: Telnet TCP 25: SMTP UDP/TCP 50: Remote Mail Checking Protocol TCP 51: IANA reserved TCP/UDP 53: Domain Name System (DNS) Zone Transfer TCP/UDP 69: Trivial File Transfer Protocol (TFTP) TCP 80: HTTP UDP 123: Network Time Protocol (NTP) TCP/UDP 135: Microsoft RPC Endpoint Mapper UDP 137: NetBIOS Name Service (NBNS) […]

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TCP Communication Flags

There are six TCP communication flags: Govern the establishment, maintenance and termination of a connection: SYN ACK FIN RST Provide instructions to the system: PSH URG   List of TCP Communication Flags SYNC SYNC, also known as synchronize, notifies the transmission. ACK ACK, also known as acknowledgment, confirms the receipt. FIN FIN, also known as […]

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