Application Protocols

This chapter covers some of today's most widely used application protocols.

This chapter covers the following topics:

■ Domain Name System (DNS)—Topics in this section include how DNS is configured on Cisco routers and what port numbers are used when delivered across an IP network.

■ Trivial File Transfer Protocol (TFTP)—This section covers the common uses of TFTP, particularly on Cisco IOS-enabled routers. The process used to copy files to and from a TFTP server is described.

■ File Transfer Protocol (FTP)—This section covers FTP and the advanced mechanisms used in this connection-orientated protocol to ensure data delivery.

■ Other application topics—Sections are included for Hypertext Transfer Protocol (HTTP), Secure Sockets Layer (SSL), Simple Network Management Protocol (SNMP), Simple Mail Transfer Protocol (SMTP), Network Time Protocol (NTP), Secure Shell (SSH), Lightweight Directory Access Protocol, and Active Directory. These sections cover some common configurations and Cisco IOS commands on Cisco routers that enable these applications. Cisco implementation of SSH in IOS and RDEP will also be covered.

NOTE SNMP, although not listed officially as an exam topic on Cisco.com, is a possible topic in the written examination.

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