Networks and Routers

[Unidentified]

Hi all, i was just wondering wether you can see on a network through the router, like you can on a network through a hub. Is a router just for sharing you internet connection?

 

[jlanka]

the "routers" they sell to the consumer these days are actualy router with built-in hubs (actually switches). So the answer to your question is yes.

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jlanka (. .)
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[Unidentified]

Ah, cheer's! That is good news! Thank's

 

[Dev]

Nope. A hub is a Layer 1 device and all traffic is shared and collisions can occur. Hence the term collision domain. A switch is layer 2 and all broadcasts are shared (broadcast domain), but host to host communication is not (which enables full duplex). A router is layer 3 and does not forward broadcasts.
As for whether you can "see on a network", that depends. A router forwards traffic between separate networks and thus one network can "see" the other. However, if "see" means "can I sniff the network" the answer is no (if you had to ask).

Dev

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[TomaHawK]

oh no! he knoweth the OSI Reference Model > cool! this was not meant sarcastic at all.

<A HREF="http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci523729,00.html" target="_new"> OSI Reference Model </A>

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