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
Application | Protocols |
|---|
File transfer | FTP |
Terminal emulation | Telnet |
Electronic mail | SMTP |
Network management | SNMP |
Distributed file services | NFS, XDR, RPC, X Windows |
