Local Area Network Protocols; Ethernet/Ieee 802.3 Protocols - Bay Networks 5390 Administering

Communications server

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Table of Contents

Network management is a major aspect of Model 5390 administration. This chapter describes the

Model 5390 implementation of local area network (LAN), TCP/IP, and LAT protocols. These

protocols are international standards; however, networks can choose to implement them differently.

Local Area Network Protocols

The Model 5390 server supports the Ethernet Rev. 2.0 and IEEE 802.3 protocols. These protocols

provide both the data link and physical layers for communication between the Model 5390 server

and the local host.

The Ethernet and IEEE 802.3 protocols specify the method for accessing the physical and network

levels of the transmission medium. At the physical level, access is provided via Carrier Sense

Multiple Access with Collision Detection (CSMA/CD). At the network level, Ethernet and IEEE

802.3 speciﬁcations handle IP encapsulation differently. Although the differences are minor, these

methods are not compatible; hosts using one encapsulation method cannot communicate with hosts

using the other. The Model 5390 server can be conﬁgured to use either method; it is compatible

with both Ethernet Rev. 2 and IEEE 802.3 transceivers.

The transmission medium is a common bus with high transmission data rates (10 MHz). It is often

a coaxial cable; however, other media, such as ﬁber optic cable, twisted pair, or thin-wire Ethernet

can be used. Because this medium is a common bus, Ethernet permits multiple hosts to share the

same transmission medium.

Network Protocols

NOTE: AppleTalk, starting on page A10-1, describes the AppleTalk

Remote Access Protocol (ARAP). Internetwork Packet Exchange (IPX)

Protocol, starting on page A9-1, describes the IPX Protocol.