By Scott Bennett
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Additional resources for 31 Days Before Your CCENT Certification (Cisco Networking Academy Program)
IM servers Various, depending on vendor Users can install compatible IM clients and communicate instantly with other users on the same IM network. 1: Internet service providers (ISP) support many services and applications. These applications use UDP and/or TCP at the transport layer and IP at the network layer. ISP support personnel must be familiar with the TCP/IP protocols to best maintain reliable communication for users. Table 293 provides examples and functions of protocols used in the four layers of the TCP/IP model.
Table 30-2 describes the OSI model and the associated protocols and PDUs for each layer. 1) Packets 2 (Data link) MAC (00-00-0C-1A-22-3B) Frames 1 (Physical) Bits (1010010001010001) Bits Table 30-3 shows the headers for an Ethernet frame and the encapsulated headers for an IP packet and TCP segment included in the frame. The table also identifies the OSI layer and protocol related to the headers. 8 22 3345 Ethernet MAC er frame header Ethernet MAC IP header IP header TCP header TCP head- frame header Table 30-4 compares the layers of the OSI model and the TCP/IP model.
SMTP operates on TCP port 25. A server makes repeated attempts to transfer an email and then returns the e-mail as undeliverable after a specified period of time. ■ Post Office Protocol version 3 (POP3) allows an e-mail client to retrieve e-mail on TCP port 110. The messages are downloaded to the client and typically are removed from the server. ■ Internet Message Access Protocol (IMAP4) allows an e-mail client to retrieve e-mail on port 143. IMAP4 leaves a copy of the e-mail on the server and allows the client to organize the e-mails on the server.
31 Days Before Your CCENT Certification (Cisco Networking Academy Program) by Scott Bennett