Network Devices
CPSC 330 - Fall 2003

devices are typically categorized according to layer

   +-----------+
   |application| http / domain name  --  gateway (may be software on host)
   +-----------+
        ...
   +-----------+
   | transport | tcp  / port         --  gateway (may be software on host)
   +-----------+
   |  network  | IP   / IP address   --  router, switch
   +-----------+
   | data link | Eth. / MAC address  --  network interface card, bridge, switch
   +-----------+
   |  physical | bits                --  repeater, hub, switch
   +-----------+

devices

functional comparison

                      hubs   bridges   routers   switches
  traffic isolation    no      yes       yes       yes
  plug and play        yes     yes       no        yes
  optimal routing      no      no        yes       no
  cut-through          yes     no        no        yes
note: some sources now use the term "bridge" to mean a switch with multiple stations attached to each port versus "switch" to mean one station per port


see also


[extra info, not required]

devices are also categorized according to position in network

access/gateway
  LAN switching
    Ethernet
    FDDI
  wireless
    LAN bridges
    802.11
  edge termination
    access concentrators
      DSLAM
      VLAN gateways
    telephony
      VoIP
      VoATM
    modems
      xDSL
      ISDN
      analog
      cable

edge/server
  firewalls and VPNs
    VPN switch
    NAT router
  WAN bridge
    IP over ATM
  L3+
    network/storage caching
    SSL acceleration
  WAN packet switching
    ATM
    frame relay
    IPv4
  WAN circuit switching
    xDSL
    ISDN

core
  backbone routers
    IP
    ATM
    frame relay
  optical cross connections
    SONET
    ATM over WDM


[CPSC 330 homepage]

mark@cs.clemson.edu