Summary

Chapter 15: Advanced Networks 7■■■■■■■■AppleTalk is a protocol suite to network Macintosh computers. It consists of a comprehensiveset of protocols that span the seven layers of the OSI reference model. TheAppleTalk protocol was designed to run over LocalTalk, which is the Apple LAN physicaltopology. It is also designed to run over major LAN types, notably Ethernet andToken Ring.Hypertext Transfer Protocol (HTTP) governs how files such as text, graphics, sound,and video are exchanged on the World Wide Web (WWW). The Internet EngineeringTask Force (IETF) developed the standards for HTTP.File Transfer Protocol (FTP) provides services for transferring files. FTP allows multiplesimultaneous connections to remote file systems.Secure Shell (SSH) is used to securely connect to a remote computer.Telnet is an application used to connect to a remote computer, but it lacks security features.Post Office Protocol (POP) is used to download e-mail from a remote mail server.Internet Message Access Protocol (IMAP) is also used to download e-mail from aremote mail server.Simple Mail Transfer Protocol (SMTP) is used to send e-mail to a remote e-mailserver.Consider the following when selecting protocols:■■■■The TCP/IP suite of protocols is required for every device to connect to the Internet.This makes it a preferred protocol for networking.NetBEUI is a small, fast protocol that is useful in low-security networks. NetBEUI performswell in a small network that is not connected to the Internet. It is easy to installand requires no configuration. However, NetBEUI can cause unnecessary traffic on alarge network, so it is not a good choice if the network will grow.IPX/SPX is a protocol that belongs to older versions of Novell Netware. Because of thegrowth of the Internet, newer versions of Novell Netware use TCP/IP instead ofIPX/SPX.Apple Macintosh networks have abandoned the AppleTalk protocol for the TCP/IPsuite of protocols to ensure connectivity with other TCP/IP networks, most notably theInternet.When the TCP/IP protocol stack is enabled, other protocols become available on specificports, as shown in Table 15-1.