Aggregation Layer: Consolidates traffic and applies policies.
Access Layer: Connects end devices like PCs and phones.
Why " Network Layer " Is Incorrect:
" Network layer " is not a term used to describe physical or logical architecture in campus networks. It refers to Layer 3 in the OSI model, which is about IP routing.
Why Other Options Are Correct:
Core, access, and aggregation layers are widely used in hierarchical network design.