350-501 Question #581: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Users on a LAN that is connected to R4 communicate to multiple servers on the corporate network. Initially, the servers were located on the same LAN. However, after congestion was reported, the engineering team decided to relocate the servers to two different networks. Which task should the team perform to improve performance on the overall network while still allowing traffic to flow between the different hosts?

Options

• AIdentify the traffic to each server in a prefix list and apply a traffic policing policy.
• BIdentity the traffic to each server with an ACL and apply the ACL to a threshold policy that drops
• CIdentity the traffic to each server in a distribute fist and implement FIFO to the Interfaces In the
• DIdentity the traffic to each server with a dass map and apply It to a traffic-shaping policy.

Explanation

To improve overall network performance and manage congestion for server traffic, the team should use a class map to identify the traffic destined for each server and then apply a traffic-shaping policy.

Common mistakes.

• A. Prefix lists are primarily used for route filtering, not for traffic classification in QoS policies, and while policing can manage congestion, shaping is generally preferred when the goal is to allow all traffic to flow.
• B. While ACLs can identify traffic, applying them to a policy that simply drops traffic (policing) is more aggressive than shaping and may not fully align with the goal of 'still allowing traffic to flow' for all connections.
• C. Distribute lists are used for filtering routing updates, not for classifying user data traffic for QoS, and implementing FIFO offers no advanced congestion management or performance improvement.

Concept tested. QoS traffic classification and shaping

Reference. https://www.cisco.com/c/en/us/td/docs/ios/qos/configuration/guide/12_2sr/qos_12_2sr_book/qos_intro.html

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