The TCP/IP Guide A Comprehensive, Illustrated Protocols
Applications are designed to use either the UDP or TCP transport layer protocol depending on the type of connection they require. For example a web server normally uses TCP port 80. It can use any port, but the web server application is designed to use a TCP connection. See TCP vs UDP. Here is a very good video that explains ports and sockets.
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Port 27 Details. Backdoor.Amitis [ Symantec-2003-010717-1940-99] (2003.01.07) Windows remote access trojan. Listens on ports 27, 551. Other variants of Backdoor.Amitis also use ports 3547, 7823, 12345, 13173, 44280, 44390, 47387, 64429. err. Port numbers in computer networking represent communication endpoints.
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What is Well-known port numbers? Well-known port numbers are port numbers for Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) that have been assigned to specific TCP/IP applications or services by the Internet Assigned Numbers Authority (IANA).Well-known port numbers are assigned within the range 0 through 1023 and are specified in Request for Comments (RFC) 1060.
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UDP and TCP ports: A list of the most important ports. TCP and UDP are used to connect two devices over the Internet or other networks. However, to give data packages an entrance to the PC or server at the other end of the connection, the "doors" have to be open. These openings into the system are called ports.
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In computer networking, a port is a communications socket/endpoint in a computer's operating system. A port is associated with an IP address of the host, as well as the type of protocol used for communication.A port in conjunction with the IP address is known as a socket or endpoint. The Transport Layer protocols, such as the Transmission Control Protocol (TCP) and the User Datagram Protocol.
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TCP and UDP headers have a section for indicating port numbers. Network layer protocols — for instance, the Internet Protocol (IP) — are unaware of what port is in use in a given network connection. In a standard IP header, there is no place to indicate which port the data packet should go to. IP headers only indicate the destination IP.
TCP Ports
In the process of specifying the web site your computer will arbitrarily pick a port number to use as its "source port." The number will be above 49152 which is the beginning of the "Dynamic, Private, or ephemeral ports" but below 65535 which is the highest port number available. The chosen port number is associated with that browser "instance."
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TCP is called a connection-oriented protocol because it establishes a connection between the receiving and sending devices before transmitting any data. TCP ports are ports that comply with the transmission control protocols. Some TCP ports include File Transfer Protocol ports (20 and 21) for file transfers, the SMTP port (25) and IMAP port.
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Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP. Service names are assigned on a first-come, first-served process, as documented in [ RFC6335 ]. Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports.
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TCP is a connection-oriented protocol that requires a connection or a circuit between the source sending computer and the destination one. TCP is one of the two main ways to transmit data in a TCP/IP network. UDP, which is a best-effort connectionless protocol, is the other one. For devices to communicate via TCP, they use TCP ports.
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443. HTTP with Secure Sockets Layer (SSL) Port used for secure web traffic. TCP and UDP. 3389. Remote Desktop Protocol (RDP) Port used by remote desktop to remotely manage other windows system. TCP and UDP. The transport layer has a lot of ports to accommodate various application protocols simultaneously.
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Transmission Control Protocol (TCP) The Transmission Control Protocol (TCP) is a transport protocol that is used on top of IP to ensure reliable transmission of packets. TCP includes mechanisms to solve many of the problems that arise from packet-based messaging, such as lost packets, out of order packets, duplicate packets, and corrupted packets.
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Well-known ports. Well Known Ports (Numbers 0 to 1023) - These numbers are reserved for services and applications. They are commonly used for applications such as HTTP (web server) POP3/SMTP (e-mail server) and Telnet. By defining these well-known ports for server applications, client applications can be programmed to request a connection to that specific port and its associated service.
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Port number. For TCP and UDP, a port number is a 16-bit unsigned integer, thus ranging from 0 to 65535. For TCP, port number 0 is reserved and cannot be used, while for UDP, the source port is optional and a value of zero means no port.A process associates its input or output channels via an internet socket, which is a type of file descriptor, associated with a transport protocol, a network.
TCP vs IP Difference and Comparison
This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic.They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist. The Internet Assigned Numbers Authority (IANA) is.
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The Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) each use port numbers for their communication channels. The ports numbered 0 through 1023 are the well-known system ports, reserved for special uses. Port 0 is not used for TCP/UDP communication although it used as a network programming construct. vaeenma / Getty Images.
