Which three functions are performed at the distribution layer of the hierarchical network model? (Choose three.)

Which three functions are performed at the distribution layer of the hierarchical network model? (Choose three.)

• isolates network problems to prevent them from affecting the core layer
• provides a connection point for separate local networks
• forwards traffic that is destined for other networks
• allows end users to access the local network
• transports large amounts of data between different geographic sites
• forwards traffic to other hosts on the same logical network

Explanation: The primary function of the distribution layer is to aggregate access layer switches in a given building or campus. The distribution layer provides a boundary between the Layer 2 domain of the access layer and the Layer 3 domain of the core. On the Layer 2 side, it creates a boundary for Spanning Tree Protocol (STP), limiting propagation of Layer 2 faults. On the Layer 3 side, it provides a logical point to summarize IP routing information when it enters the core Layer. The summarization reduces IP route tables for easier troubleshooting and reduces protocol overhead for faster recovery from failures.

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