Network Devices

• Network Interface Card (NIC), connectors (BNC, RJ45)
• Repeaters: device that extends the distance of the network; no more than 3 repeaters between nodes [Physical Layer]
• hub - multiport repeater
• bridges - used to connect two or more networks that use the same protocol (smart repeater) [Data-Link Layer]
• switch - multiport bridge
• routers - network node that forwards datagrams around the network; super-intelligent bridge (used for connecting large networks; used to choose most efficient network path) [Network Layer]
• gateway device that performs routing functions, usually as a standalone device, that also can perform protocol translation from one network to another.
• brouter - performs functions of both router and bridge
• packet-switching - all transfers are based on a self-contained packet of data; others are message switching and line switching

Network Interface Cards

• make sure it has the right type of connector (RJ45, BNC or AUI)
• make sure it supports the right speed (some now support 100 MBps)
• NE2000 is the standard of compatibility although 3COMs are also standard
• check bus type (ISA / PCI, MicroChannel)
• make sure it has drivers for your NOS

Working with Hubs / Switches

• find a central location for the hub
• the hub requires power
• purchase a hub that can be expanded
• hubs can be daisy-chained (make sure the uplink is correct)
• computers cannot be more than 3 hubs away from each other
• SNMP (Simple Network Management Protocol) is only needed for large networks

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