F5
101 · Question #199
101 Question #199: Real Exam Question with Answer & Explanation
The correct answer is D: The pool members whose nodes are failing the ICMPbased monitor will be marked unavailable.. When a node-level monitor fails, all pool members residing on that node are marked unavailable regardless of any passing pool-level monitors.
Section 3: Load Balancing and High Availability Basics
Question
A site has assigned the ICMP monitor to all nodes and a custom monitor, based on the HTTP template, to a pool of web servers. The HTTPbased monitor is working in all cases. The ICMP monitor is failing for 2 of the pool member 5 nodes. All other settings are default. What is the status of the monitor is working in all cases. The ICMP monitor is failing for 2 of the pool member. 5 nodes. All other settings are default. What is the status of the pool members.
Options
- AAll pool members are up since the HTTPbased monitor is successful.
- BAll pool members are down since the ICMPbased monitor is failing in some cases.
- CThe pool members whose nodes are failing the ICMPbased monitor will be marked disabled.
- DThe pool members whose nodes are failing the ICMPbased monitor will be marked unavailable.
Explanation
When a node-level monitor fails, all pool members residing on that node are marked unavailable regardless of any passing pool-level monitors.
Common mistakes.
- A. A passing pool-level HTTP monitor alone is not sufficient; the node-level ICMP monitor failure makes the node unavailable, which cascades to all pool members on that node.
- B. Only the 2 pool members whose corresponding nodes fail the ICMP monitor are affected; the remaining pool members on passing nodes continue to receive traffic normally.
- C. 'Disabled' is an administrative state set intentionally by an operator via the management interface, not a state resulting from a monitor failure.
Concept tested. F5 BIG-IP monitor hierarchy and cascading node unavailability
Topics
#health monitors#ICMP monitor#HTTP monitor#pool member status
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