CCNA1_M11_TCPIP_Transport_Application (1130712), страница 2
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Ahyperlink is an object, word, phrase, or picture, on aWeb page. When that hyperlink is clicked, it directs thebrowser to a new Web page.• The Web page contains, often hidden within its HTMLdescription, an address location known as a UniformResource Locator (URL).Telnet• Telnet client software provides the ability tologin to a remote Internet host that is running aTelnet server application and then to executecommands from the command line.• Telnet works at the application layer of theTCP/IP model. Therefore, Telnet works at the topthree layers of the OSI model. The applicationlayer deals with commands. The presentationlayer handles formatting, usually ASCII. Thesession layer transmits.SMTP•••Email servers communicatewith each other using theSimple Mail TransferProtocol (SMTP) to sendand receive mail.
The SMTPprotocol transports emailmessages in ASCII formatusing TCP.The most popular mailclient protocols are POP3and IMAP4, which both useTCP to transport data.A good way to test if a mailserver is reachable is toTelnet to the SMTP port (25)or to the POP3 port (110).SNMP••The Simple NetworkManagement Protocol (SNMP)is an application layer protocolthat facilitates the exchange ofmanagement informationbetween network devices.An SNMP managed networkconsists of the following:– Network managementsystem (NMS)– Managed device– AgentsLab Companion• 11.2.4 Protocol Inspector, TCP and HTTPSummary••••••TCP/IP transport layer functionsTCP concepts and processesTCP and UDP header formatTCP and UDP portTCP/IP application layer functionsTCP/IP application layer protocols.
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