Important Protocols

TCP/IP

• Provides communications in a heterogeneous environment.
• Routable, defacto standard for internetworking.
• SMTP, FTP, SNMP are protocols written for TCP/IP
• Disadvantages are size and speed.

NetBEUI

• NetBIOS extended user interface.
• Originally, NetBIOS and NetBEUI were tightly tied together but, NetBIOS has been separated out to be used with other routable protocols. NetBIOS acts as a tool to allow applications to interface with the network; by establishing a session with another program over the network
• NetBIOS operates at the Session layer.
• Small, fast and efficient.
• Compatible with most Microsoft networks.
• Not routable and compatible only with Microsoft networks.

X.25

• Protocols incorporated in a packet switching network of switching services.
• Originally established to connect remote terminals to mainframe hosts.

XNS

• Xerox Network System.
• Developed for Ethernet LANs but has been replaced by TCP/IP.
• Large, slow and produces a lot of broadcasts.

IPX/SPX and NWLink

• Used for Novell networks.
• Small and fast.
• Routable.

APPC

• Advanced Program to Program Communication
• Developed by IBM to support SNA.
• designed to enable application programs running on different computers to communicate and exchange data directly.

AppleTalk

• Apple's proprietary protocol stack for Macintosh networks.

OSI Protocol Suite

• each protocol maps directly to a single layer of the OSI model

DECnet

• Digital Equipment's proprietary protocol stack
• Defines communications over Ethernet, FDDI MAN's and WAN's.
• DECnet can also use TCP/IP and OSI protocols as well as its own protocols
• Routable.