Cisco TrustSec uses tags to represent logical group privilege. This tag, called a Security Group Tag
(SGT), is used in access policies. The SGT is understood and is used to enforce traffic by Cisco
switches, routers and firewalls . Cisco TrustSec is defined in three phases: classification,
propagation and enforcement.
When users and devices connect to a network, the network assigns a specific security group. This
process is called classification. Classification can be based on the results of the authentication
or by associating the SGT with an IP, VLAN, or port-profile (-> Answer 'security group tag
ACL assigned to each port on a switch' and answer 'security group tag number assigned to each
user on a switch' are not correct as they say "assigned ... on a switch" only. Answer 'security group
tag ACL assigned to each router on a network' is not correct either as it says "assigned to each
router").

SW3 does not have VLAN 60 so it should not receive traffic for this VLAN (sent from SW2).
Therefore we should configure VTP Pruning on SW3 so that SW2 does not forward VLAN 60 traffic
to SW3. Also notice that we need to configure pruning on SW1 (the VTP Server), not SW2.

The ―virtual MAC address‖ is 0000.0c07.acXX (XX is the hexadecimal group number) so it is using HSRPv1.
Note: HSRP Version 2 uses a new MAC address which ranges from 0000.0C9F.F000 to 0000.0C9F.FFFF.