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in my opinion there is no any collision domain in the router......but switch has collision domains for each interfaces & hub has one collision domain
Network+ Guide to Networks answer: Bridge, Switch, Router
When using network switches, each port on the switch is its own collision domain.
Like a switch, a router places nodes that are connected to it in separate collision domains.
On shared-media networks (i.e. hubs or pure ethernets), routers break up broadcast domains and bridges break up collision domains. Routers also break up collision domains. On switched networks, routers break up broadcast domains, and every switch port is its own separate collision domain.
Bridges, Switches and Routers will all separate collision domains.
In Router one and in switch each port having collision domain.
Zero. No collisions can occur within a full-duplex environment, as transmit and receive operations are performed on another set of wires. Thus, no collision domains would exist. Carrier Sense Multiple Access with Collision Detection (CSMA/DC) is not part of a full-duplex network for this reason.
Since Hubs are Physical-layer devices and do not segment collision domains (which switches do), the answer is "one". Since switch DO segement collision domains, a switch can pass as many frames as it has ports.
Hubs do not reduce collision domains. All devices connected to the hub are in a single collision domain, where as on a switch, each port is its own collision domain.
Switch breaks collision domains, creates virtual circuits for each connection also it does not share bandwidth of one port with others.
If, by "HUSwith" you mean "hubs with", and by "hub" you really mean "hub" and not "switch" then you'll have either three collision domains (if the three hubs are not connected to each other) or a single collision domain (if the three hubs are connected to each other). Replace the hubs with switches and you'll have 30 collision domains, if the switches are not connected, or 32 or 33 if they are (depending on how the inter-switch connections are made: two switches connected to a common third vs. each switch connected to both the other two).