Collision and Broadcast Domains
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Collision Domain
A network segment where data packets can "collide" when two devices transmit at the same time.
Broadcast Domain
A network segment in which any broadcast sent by a device (e.g., an ARP request) is received by all other devices within the same segment, and the broadcast is not forwarded by routers to other segments.
Device-by-device Behavior
Hub
One big collision domain (all ports share it). Collisions are common.
One big broadcast domain (all ports receive broadcasts).
Switch
Each port is its own collision domain (no collisions between ports).
By default, all ports in the same VLAN are in one broadcast domain. Multiple VLANs = multiple broadcast domains.
Router
Each interface is its own collision domain.
Each interface is its own broadcast domain (routers do not forward broadcasts by default).
Example
Cisco Packet Tracer (Version 6.2.0.0052)
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Keywords
collision domain, broadcast domain, network segment, Ethernet, hub, switch, router, MAC address, IP address, CSMA/CD, frame, packet, collision detection, network traffic, VLAN, subnet, bandwidth, collision handling, network topology, data transmission, Nerd Cafe, نرد کافه
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