Cisco Three-Tier Network Design Model

Question 1

Cisco Three-Tier Network Design Model

Answer 1

• Divides the network into 3 distinct components
• Core Layer
• Distribution Layer
• Access Layer

Question 2

Core Layer

Answer 2

• Provides the fastest switching path in the network.
• Considered the network backbone
• low latency and high reliability

Question 3

Distribution Layer

Answer 3

• Sometimes referred to as aggregation layer
• Provides route filtering and interVLAN routing
• the ideal place to enforce security policies

Question 3

Access Layer

Answer 3

• Serves as a media termination point for servers and endpoints.
• Ideal place for user authentication and port security.
• Determines VLAN assignment for each endpoint.

Question 4

Network Admission Control (NAC) (Access Layer)

Answer 4

• Provides security by preventing noncompliant devices from accessing the network.
• Automates device discovery and inventory using NAC Profiler.
• Ensures compliance with organizational requirements (e.g., updated antivirus definitions).

Question 5

Layer 2 vs. Layer 3 in Access Layer

Answer 5

• Traditionally, access layer uses Layer 2 switches.
• Some designs incorporate Layer 3 switches, blurring the boundary between Layer 2 and Layer 3 switching.