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- From: matt@wardsgi.med.yale.edu (Matt Healy)
- Subject: Definitions
- Message-ID: <matt-060193151719@wardmac2.med.yale.edu>
- Followup-To: comp.dcom.lans.ethernet
- Sender: news@news.yale.edu (USENET News System)
- Nntp-Posting-Host: wardmac2.med.yale.edu
- Organization: Yale University--Genetics
- Date: Wed, 6 Jan 1993 20:28:06 GMT
- Lines: 38
-
- I thought I knew the definitions of repeater, bridge,
- router, and gateway. However I was recently talking
- shop with a fellow network administrator and he said
- I had it wrong. Since he runs a much bigger net than
- I run, and has been doing it longer, I wonder if he's
- right!
-
- Here's how I understand the terms; corrections requested:
-
- repeater: operates only at level of physical media; allows
- a total length greater than maximum for one segment and
- provides fault isolation. All traffic goes out to all
- segments. Some, such as ours, have lights for traffic
- and fault monitoring.
-
- bridge: like repeater it operates at physical level;
- adds ability to isolate local traffic by checking
- Ethernet source and destination addresses and won't
- pass it on if both are in same segment. For instance,
- we have a bridge between our lab net and the rest of
- campus so our heavy image processing traffic won't
- flood the campus spine.
-
- router: works at the protocol level (TCP/IP, Novell,
- AppleTalk, or whatever) and intelligently directs
- packets on to their destinations in an interconnected
- network. Our Apple router connects LocalTalk and Ethernet
- cabling, for example.
-
- gateway: works at a still higher level so it can translate
- data between different protocols so that, say, Macs, Vaxes,
- and PCs can exchange data.
-
- Matt Healy
- "I pretend to be a network administrator; the lab
- net pretends to work!"
-
- matt@wardsgi.med.yale.edu
-