Beginner studying for CCNA exam.
I have a bit of confusion between Bridges.
"Bridges are used to connect network segments"
Do these network segments need to be on the same network?
I mean can a network with 10 hosts on a hub with ip address 172.16.1.15 communicate with another network 192.168.1.2 by connecting a bridge.
With switches, what is the major difference between a bridge and a switch not with respect to functionality but general difference in terms of frame forwarding ..
Do bridges and switches work same EXCEPT bridges have less ports and switches have more?
If someone can avoid this confusion, I would be really grateful to him.
Yes, if it doesn't already know where to send the packet (ie when the destination MAC address is not in it's table), it always floods all ports (at least all ports in the same VLAN, if you don't understand it, ignore the VLAN part for the time being about it yet).
You can have multiple MAC addresses on one port, such as if there is a switch/hub on that port, or say a user running virtual machines on a computer. As such, it can never assume it knows all possible MAC addresses on one port, so it always has to flood all ports (when it doesn't know where it is).
Note that it isn't flooding addresses, it is flooding ports, ie it doesn't flood the known addresses, when it reaches the flood stage, it doesn't care about what is already there and that table has no relevance.
My definition of switch is "marketing term for fast bridge"... which technically means "bridge";-)
I guess the only reason why the term was introduced was to push you to upgrade your "old" bridge and buy a new cool device. I think you can challenge anyone who has a clear definition of a switch (vs. a bridge). However, if some CCNA book pretend those are two kind of devices, don't lose points for that!