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Home > Archive > CCNP > August 2001 > HELP ME! A Study Question about BCMSN!
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HELP ME! A Study Question about BCMSN!
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| alwayscy 2001-08-28, 8:58 pm |
| I can't comprehend the meaning of these sentances underline:
"Device switches may support one or more subnets. A subnet must reside within one broadcast domain. This means that all stations residing in or ports configured on the same VLAN are assigned network addresses within the same subnet. However, a single VLAN can support multiple subnets."
(From BCMSN Student Guide
Release 1.0 PAGE 2-46)
all stations ... on the same VLAN are assigned ..."same subnet", why a single VLAN can support multiple subnets?
Could you help me? | |
| depamo 2001-08-29, 8:54 am |
| The comments from the book are just a reminder to make sure that you assign an IP Address subnet to a VLAN, and don't get them mixed up.
Example is if you have two VLAN's that are assigned IP Addresses from the same Subnet, you will not be able to route between the two because the router will have no idea of which VLAN to send the traffic.
On the other side, one VLAN can have multiple subnets defined within, not good pratice, but you can do it and the router will act as the router between the two subnets without having to move information between the two VLAN's.
This is just added traffic for the router that either should be put into its own VLAN or supernetted together if possible. Some reasons could warrant this, no VLAN's left, temporary change or getting ready to separate the two subnets and moving PC's to the right IP's first. It isn't very common but it does occur. |
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