Need to fins answer of port security in voip

[mirror512]

I have not been able to find the answer of this question

When you enable Port-security on an interface that is also configured for  a voice VLAN, what is the maximum number of MAC addresses that should  be set on this port? Select the best response

A. No more that one secure MAC address

B. The Default will be set

C. The IP phone should use a dedicated port, therefor only one MAC address is needed per port

D. No Value is needed if the switchport priority extend command is configured.

E. No more that two MAC addresses should be Set.

[dominic.caron]

Hi,

You need to allow 1 Mac on the voice vlan and 2 on the native(access) vlan. If you dont want to specify it by vlan, configure it to 3 max.

When to phone boot, it will send packets on the native vlan...like CDP or LLDP packets. The same MAC on two vlan need to be counted twice.

But...

Prior to Cisco IOS Release 12.2(31)SG, you required three MAC addresses as the maximum parameter to support an IP Phone and a PC. With Cisco IOS Release 12.2(31)SG and later releases, the maximum parameter must be configured to two, one for the phone and one for the PC.

Answer: E