Switches/hubs Collision domain

1-If I understand HUBs have one collision domain for all ports, broadcast is heard by all ports
2-Switches have one domain on each port. what if a host from one port sends a broadcast , which ports are going to listen to this broadcast.?
3-now if implement Vlans, if one host sends a broadcast , only hosts within the same vlan will hear the broadcast.

my question is to confirm if my statements above are correct or wrong, and explain it better.

Thanks
jskfanAsked:
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Don JohnstonInstructorCommented:
1-If I understand HUBs have one collision domain for all ports, broadcast is heard by all ports
Correct. Hubs are dumb devices. Almost like a splitter. Anything that comes in one port will go out all ports. There's no intelligence involved.

2-Switches have one domain on each port. what if a host from one port sends a broadcast , which ports are going to listen to this broadcast.?
Switches have one collision domain per port. Broadcasts, however, are flooded out all ports except the port that received the broadcast.

3-now if implement Vlans, if one host sends a broadcast , only hosts within the same vlan will hear the broadcast.
Correct.
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RGRodgersCommented:
You may be confusing collision domains and broadcast domains.  Hubs exist in one collision domain.  Switch ports each exist in one collision domain.  Broadcast domains are limited by subnets.  ...RG
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jskfanAuthor Commented:
That s right I was confusing Collision with broadcast.

thank you for the clearance
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jskfanAuthor Commented:
thank you guys
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