Which two statements about the MAC address table space are true? (Choose two.)
A.
You can disable learning on a VLAN to reduce table-space requirements.
B.
When you disable learning on a VLAN with an SVI, IP packet flooding in the Layer 2 domain is also
disabled.
C.
Unicast, multicast, and broadcast MAC address filtering is configured globally and disabled by
default.
D.
The default setting for static MAC addresses to age out of the MAC address table is 300 seconds.
E.
Turning off MAC learning on VLANs 900 through 1005 disables learning on VLANs 900 through
1001.
A & E are correct.
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E is completely wrong.
no mac address-table learning vlan vlan-id
Disable MAC address learning on the specified VLAN or VLANs. You can specify a single VLAN ID or a range of VLAN IDs separated by a hyphen or comma. Valid VLAN IDs are 1 to 4094.
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Confirmed this in a real lab, btw.
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Still, http://www.cisco.com/c/en/us/td/docs/wireless/mwr_2941_dc/software_config/guide/3_3/2941_33_Config_Guide/mac_lrn.pdf
states: “Valid VLAN IDs 1 to 4094. It cannot be an internal VLAN.” and internal VLANs are 1002-1005. So if you disable mac learning for 900-1005, you might end up with 900-1001…
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You cannot disable MAC address learning on a VLAN that is used internally by the router. If the VLAN ID that you enter is an internal VLAN, the switch generates an error message and rejects the command.
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