NSE4 Question #241: Real Exam Question with Answer & Explanation

Question

Which of the following methods does the FortiGate unit use to determine the availability of a web cache using Web Cache Communication Protocol (WCCP)?

Options

• AThe FortiGate unit receives periodic "Here I am" messages from the web cache.
• BThe FortiGate unit polls all globally-defined web cache servers at a regular intervals.
• CThe FortiGate using uses the health check monitor to verify the availability of a web cache server.
• DThe web cache sends an "I see you" message which is captured by the FortiGate unit.

Explanation

FortiGate units determine the availability of WCCP web caches by employing health check monitors, ensuring traffic is only directed to active and responsive cache servers.

Common mistakes.

• A. While WCCP involves 'Here I am' messages from the cache, FortiGate's determination of availability often extends beyond passive reception to include active health checks for more robust monitoring.
• B. The specific mechanism for WCCP health in FortiGate is typically referred to as a health check monitor, which is a more defined process than merely 'polling all globally-defined web cache servers'.
• D. 'I see you' messages are not a standard or primary method FortiGate uses for WCCP web cache availability determination; the 'Here I am' message from the cache is part of WCCP, but active health checks are also crucial.

Concept tested. FortiGate WCCP web cache availability health checks

Reference. https://docs.fortinet.com/document/fortigate/5.6.0/cookbook/389025/working-with-wccp

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