300-420 Question #26: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer must optimize the traffic flow of the network. Which change provides a more efficient design between the access and the distribution layer?

Options

• AAdd a link between access switch A and access switch B
• BReconfigure the distribution switch A to become the HSRP Active
• CChange the link between distribution switch A and distribution switch B to be a routed link
• DCreate an EtherChannel link between distribution switch A and distribution switch B

Explanation

To optimize traffic flow between the access and distribution layer, reconfiguring Distribution Switch A to become the HSRP Active gateway is the most efficient change.

Common mistakes.

• A. Adding a link between access switch A and access switch B would introduce a potential loop and is not directly related to optimizing traffic flow between access and distribution layers in a hierarchical design.
• C. Changing the link between distribution switch A and distribution switch B to a routed link is typically done to break Layer 2 loops and route between VLANs but does not directly optimize the initial flow of traffic from access to distribution by ensuring local egress.
• D. Creating an EtherChannel link between distribution switch A and distribution switch B would increase bandwidth and redundancy between them but does not address the inefficiency of traffic having to cross from one distribution switch to another if HSRP is not configured optimally for local egress.

Concept tested. HSRP optimization in campus networks

Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/campover.html

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