The Internet protocol suite includes many application-layer protocols that represent a wide variety
of applications, including the following:
• File Transfer Protocol (FTP)—Moves files between devices
• Simple Network-Management Protocol (SNMP)—Primarily reports anomalous network
conditions and sets network threshold values
• Telnet—Serves as a terminal emulation protocol
• X Windows—Serves as a distributed windowing and graphics system used for communication
between X terminals and UNIX workstations
• Network File System (NFS), External Data Representation (XDR), and Remote Procedure Call
(RPC)—Work together to enable transparent access to remote network resources
• Simple Mail Transfer Protocol (SMTP)—Provides electronic mail services
• Domain Name System (DNS)—Translates the names of network nodes into network addresses
of applications, including the following:
• File Transfer Protocol (FTP)—Moves files between devices
• Simple Network-Management Protocol (SNMP)—Primarily reports anomalous network
conditions and sets network threshold values
• Telnet—Serves as a terminal emulation protocol
• X Windows—Serves as a distributed windowing and graphics system used for communication
between X terminals and UNIX workstations
• Network File System (NFS), External Data Representation (XDR), and Remote Procedure Call
(RPC)—Work together to enable transparent access to remote network resources
• Simple Mail Transfer Protocol (SMTP)—Provides electronic mail services
• Domain Name System (DNS)—Translates the names of network nodes into network addresses
Table 30-5 lists these higher-layer protocols and the applications that they support.
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