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 TFTP's common uses, particularly on Cisco IOS-enabled routers. The process used to copy files to and from 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—Included are Hypertext Transfer Protocol (HTTP), Secure Socket 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 of the common configurations and IOS commands on Cisco routers that enable these applications.

NOTE SNMP, although not listed officially on the Cisco website, is a possible topic in the written examination.

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