At which of the following layers of the Cisco three-tier architecture should port security be implemented?

A.
Access layer

B.
Distribution layer

C.
Core layer

D.
Edge layer

Explanation:
Port security is one of the functions that should be performed at the Access layer. Among other functions that
are done at this layer are:
PoE
Link aggregation
QoS
Port security should not be performed at the Distribution layer. Among the functions that should be done at this
layer are:
Routing updates
Route summaries
VLAN traffic
Address aggregation
Port security should not be performed at the Core layer. Among the functions that should be done at this layer
are:
Access-list checking
Data encryption
Address translation
Edge is not one of the three layers in the Cisco three-tier model.
Objective:
Network Fundamentals
Sub-Objective:
Compare and contrast collapsed core and three-tier architectures

Cisco Press > Articles > Cisco Network Technology > General Networking > Cisco Networking Academy
Connecting Networks Companion Guide: Hierarchical Network Design
Study CCNA > Cisco three-layer hierarchical model