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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.
To determine the number of collision and broadcast domains in a network topology, one must analyze the devices involved. Each switch creates separate collision domains for each connected device, while a router or Layer 3 switch creates separate broadcast domains. Without a specific topology diagram or description, it's impossible to provide an exact count; however, generally, each switch adds collision domains, and each VLAN or router adds a broadcast 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.