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10.7 TCP IP Applications
TCP/IP Applications Section 10: Understanding TCP/IP Transport Layer TCP and UDP define internal software identifiers to support multiple conversations between various network devices. To differentiate the segments and datagrams for each application, TCP and UDP both have header fields that uniquely identify these applications. These unique identifiers are called port numbers. The following list is a small sampling of applications and their associated port numbers. For a more comprehensive listing, enter this search string into your favorite browser: Service Name and Transport Protocol Port Number Registry The following are common examples of TCP and UDP applications: FTP (port 21, TCP): FTP is a reliable, connectionoriented service that uses TCP to transfer files between systems that support FTP. FTP supports bidirectional binary and ASCII file transfers. SSH (port 22, TCP): SSH provides the capability to remotely access other computers, servers, and networking devices. SSH enables a user to log into a remote host and execute commands. SSH encrypts the authentication exchange and all message data. Telnet (port 23, TCP): Telnet is a predecessor to SSH. Telnet sends messages in cleartext. Most organizations now use SSH for remote communications. HTTP (port 80): HTTP defines how messages are formatted and transmitted and which actions that browsers and web servers take in response to various commands. It uses TCP. HTTPS (port 443, TCP): HTTPS combines HTTP with a security protocol (SSL/TLS) to encrypt the authentication exchange and all message data. DNS (port 53, TCP and UDP): DNS is used to resolve Internet names to IP addresses. DNS uses a globally distributed set of servers to resolve names that are associated with IP addresses. TFTP (port 69, UDP): TFTP is a connectionless service. Routers use TFTP to transfer configuration files and Cisco IOS images as well as other files between systems that support TFTP. SNMP (port 161, UDP): SNMP is an application layer protocol and facilitates the exchange of management information between network devices. SNMP enables network administrators to manage network performance, find and solve network problems, and plan for network growth. Content Unavailable This content is unavailable in this version of the course. Up Next: Challenge