A network administrator needs to configure port security on a switch. Which two statements
are true? (Choose two.)

A.
The network administrator can apply port security to dynamic access ports.

B.
The network administrator can apply port security to EtherChannels.

C.
When dynamic MAC address learning is enabled on an interface, the switch can learn
new addresses, up to the maximum defined.

D.
The sticky learning feature allows the addition of dynamically learned addresses to the
running configuration.

E.
The network administrator can configure static secure or sticky secure MAC addresses in
the voice VLAN.

Explanation:
Follow these guidelines when configuring port security:
+ Port security can only be configured on static access ports, trunk ports, or 802.1Q tunnel
ports.
+ A secure port cannot be a dynamic access port.
+ A secure port cannot be a destination port for Switched Port Analyzer (SPAN).
+ A secure port cannot belong to a Fast EtherChannel or Gigabit EtherChannel port group.
+ You cannot configure static secure or sticky secure MAC addresses on a voice VLAN.
+ When you enable port security on an interface that is also configured with a voice VLAN,
you must set the maximum allowed secure addresses on the port to at least two.
+ If any type of port security is enabled on the access VLAN, dynamic port security is
automatically enabled on the voice VLAN.

+ When a voice VLAN is configured on a secure port that is also configured as a sticky
secure port, all addresses seen on the voice VLAN are learned as dynamic secure
addresses, and all addresses seen on the access VLAN (to which the port belongs) are
learned as sticky secure addresses.
+ The switch does not support port security aging of sticky secure MAC addresses.
+ The protect and restrict options cannot be simultaneously enabled on an interface.
(
http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_19_ea1/confi
guration/guide/swtrafc.html)