Passive Monitoring and Probe-Free Performance Monitoring Quiz
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Questions and Answers

Passive monitoring measures the performance of members based on

  • Active health checks
  • RTT during TCP setup and teardown
  • Probe-free approach (correct)
  • Ping probes

    • Passive monitoring is more accurate than active monitoring because

  • It measures packet loss based on TCP headers
  • It measures member performance based on actual traffic (correct)
  • It measures RTT during TCP setup and teardown
  • It uses ping probes

    • Passive monitoring simplifies configuration and reduces network traffic by

  • Configuring target servers and protocols
  • Measuring latency based on RTT
  • Generating monitoring traffic
  • Using a probe-free approach (correct)

    • Passive monitoring measures packet loss, latency, and jitter based on

    <p>TCP traffic</p> Signup and view all the answers

    Active monitoring requires you to configure

    <p>Target servers and protocols</p> Signup and view all the answers

    Active monitoring can result in complex SD-WAN configurations when

    <p>Configuring multiple health checks and members</p> Signup and view all the answers

    Passive monitoring is disabled for hardware acceleration because

    <p>Members are always alive</p> Signup and view all the answers

    The limitations of passive monitoring include

    <p>Only measuring TCP traffic</p> Signup and view all the answers

    Active monitoring generates more monitoring traffic than passive monitoring because

    <p>It uses probes for each health check</p> Signup and view all the answers

    Configuring a ping probe to monitor the health of a member used for web traffic

    <p>Doesn't provide accurate performance metrics</p> Signup and view all the answers

    Which method is used to calculate latency in passive monitoring?

    <p>RTT of TCP connection setup and teardown</p> Signup and view all the answers

    What are the metrics calculated based on TCP header information in passive monitoring?

    <p>Jitter and packet loss</p> Signup and view all the answers

    What does passive monitoring not detect?

    <p>Dead members</p> Signup and view all the answers

    What needs to be enabled on firewall policies for passive monitoring?

    <p>Passive-wan-health-measurement</p> Signup and view all the answers

    What is automatically disabled when passive-wan-health-measurement is enabled?

    <p>Auto-asic-offload</p> Signup and view all the answers

    What does passive monitoring provide more accurate member metrics based on?

    <p>Actual traffic passing through the members</p> Signup and view all the answers

    What may affect the steering decisions made by FortiGate for SD-WAN rules configured for specific applications?

    <p>Lack of granularity</p> Signup and view all the answers

    What does per-application passive monitoring instruct FortiGate to do?

    <p>Measure the member quality based on the performance of applications</p> Signup and view all the answers

    What does FortiGate do if multiple applications use the same member in per-application passive monitoring?

    <p>Averages the metrics measured for all applications</p> Signup and view all the answers

    What needs to be enabled in SD-WAN rules for per-application passive monitoring?

    <p>Passive-measurement</p> Signup and view all the answers

    Study Notes

    Passive Monitoring vs Active Monitoring

    • Passive monitoring is more accurate than active monitoring
    • Passive monitoring simplifies configuration and reduces network traffic
    • Active monitoring requires configuration and can result in complex SD-WAN configurations when multiple probes are used
    • Active monitoring generates more monitoring traffic than passive monitoring

    How Passive Monitoring Works

    • Measures packet loss, latency, and jitter based on TCP header information
    • Calculates latency using the TCP three-way handshake
    • Metrics calculated based on TCP header information include packet loss, latency, and jitter

    Limitations of Passive Monitoring

    • Does not detect application-specific issues
    • Disabled for hardware acceleration
    • Limited to measuring TCP-based applications
    • Firewall policies must enable UDP 37777 for passive monitoring

    Per-Application Passive Monitoring

    • Instructs FortiGate to monitor application-specific traffic
    • If multiple applications use the same member, FortiGate chooses the best member based on application-specific steering decisions
    • SD-WAN rules must enable passive-wan-health-measurement for per-application passive monitoring
    • Automatically disables automatic WAN routing when enabled

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    Description

    Test your knowledge on passive monitoring and probe-free performance monitoring with this quiz. Learn about the benefits of accurate measuring, simplified configuration, and reduced network traffic. Discover the limitations such as measuring only TCP traffic and basing latency, jitter, and packet loss on TCP headers. Explore the concept of member state detection and the hardware acceleration involved.

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