Unwanted frames on a switch

[surfbum99]

If a frame comes along to a switch and it doesn't below to any VLAN, what happens to it?

 

[KiscoKid]

The frame should always have a VLAN ID. If no VLAN is configured, the VLAN ID will be 1.

The switch will simply look at the destination MAC and if it has an entry for it, it will forward it to the appropriate port. If it doesn't have a MAC entry, the frame will be forwarded to all ports except the one it arrived on.

 

[surfbum99]

Thanks thanks again!!!

Any clues on me ACL question?

 

[surfbum99]

Hi again, so if its not found, and it gets forwarded to all ports, does the switch use ARP in the process or not.
One of the exam questions had, either,

1. Gets forwarded to all ports except for one it arrived on.

2. Uses ARP and gets forwarded to all ports except for the one it arrvied on.

 

[KiscoKid]

Well it depends on the switch.

If a Layer 2 switch, it won't arp. If a layer 3 switch then yes it may arp.

As you know, arp converts between IP and MAC addresses and layer 2 switches have no concept of IP addresses hence they won't arp.

Does the CCNA even study layer 3 switches? It didn't use to when I studied it and, if that is still the case, the answer would therefore be:


1. Gets forwarded to all ports except for one it arrived on.

 

[surfbum99]

Many Thanks