F5CAB5: BIG-IP Administration Support and TroubleshootingDemo

By F5 · Browse Mode
About the Exam

F5CAB5 is one of the five exams required for the F5 Certified Administrator, BIG-IP credential. It is aimed at BIG-IP administrators and tests the knowledge, skills, and abilities needed to perform day-to-day operations plus basic deployment, management, security, and support after BIG-IP has been installed, configured, and implemented. Passing demonstrates competence in BIG-IP administration across data plane and control plane concepts.

Exam Topics

  • Determine resource utilization14%
  • Identify network level performance issues14%
  • Identify the reason load balancing is not working as expected14%
  • Identify the reason a virtual server is not working as expected14%
  • Identify the reason a pool is not working as expected14%
  • Given a scenario, review basic stats to confirm functionality14%
  • Given a scenario, interpret traffic flow14%

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  2. Exam Mode — Simulate real exam conditions with a timed session and score report.
  3. Learn Mode — Spaced repetition schedules questions you struggle with for long-term retention.

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Last updated April 27, 2026 at 6:27 PM

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QuestionQ1

Determine resource utilization

The BIG-IP is encountering data-plane resource issues.

Which traffic processing function would be affected the most?

  • A iControl transactions
  • B MCPD transactions
  • C Configuration utility
  • D APM sessions
Explanation

BIG-IP’s data plane, centered on TMM, performs runtime network-traffic processing and hosts SessionDB, which stores runtime data including APM/SWG user sessions. iControl transactions, MCPD transactions, and the Configuration utility are management or configuration functions associated with the control plane.

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QuestionQ2

Identify the reason a virtual server is not working as expected

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Refer to the exhibit.

An LTM device has a virtual server mapped to www.f5.com. Users report that when they connect to ./resources/201.1.2.h.1_1.com, they cannot receive content.

What is the likely cause of this issue?

  • A The pool associated with the virtual server is failing its health check.
  • B The pool associated with the virtual server does not have priority group activation enabled.
  • C The virtual address does not have route advertising enabled.
  • D The virtual address does not have ARP enabled.
Explanation

The virtual address has ARP disabled. ARP must be enabled for the BIG-IP system to respond to ARP requests for the virtual IP address on the local network; otherwise, clients cannot resolve that address and establish a connection. The virtual server and both pool members are available, so the pool is not shown as failed.

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QuestionQ3

Identify the reason a pool is not working as expected

During a user-reported outage affecting one virtual server, a BIG-IP Administrator checks the configured pool associated with that virtual server and finds that the pool-member status icons are black.

What does a black icon indicate?

  • A The pool members have been forced offline.
  • B The pool members' configuration is missing either a port or an IP address.
  • C There is no monitoring configured for the pool members and therefore no status is available.
  • D A monitor has marked a pool member down.
Explanation

A black BIG-IP pool-member indicator denotes an administratively disabled member, meaning it has been forced offline. A health monitor failure marks a member down instead, which is represented separately as a red status.

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QuestionQ4

Identify the reason a pool is not working as expected

A gateway_icmp health monitor is configured on a pool. The BIG-IP Administrator is investigating why the pool is shown as down even though the server is active. Other pools with servers in the same subnet are being monitored correctly.

What could cause this behavior?

  • A The host based firewall is active on the server.
  • B The HTTP service is not started on the server.
  • C The latest patches have not been installed on the server.
  • D The admin user is logged on the server.
Explanation

A Gateway ICMP monitor succeeds only when it receives a response to an ICMP echo probe. A host-based firewall on the affected server can block ICMP echo requests or replies, so BIG-IP reports the monitored pool as down even when the server and its other services are active.

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QuestionQ5

Identify network level performance issues

A BIG-IP Administrator is working with a BIG-IP device and finds that one of the interfaces in a Trunk is DOWN.

What explains this interface status?

  • A There is NO transceiver installed on the Interface.
  • B There is NO default route configured for this trunk.
  • C The switch is NOT connected to the Interface.
  • D The media speed of the Interface has NOT been set.
Explanation

A trunk member interface is DOWN when its physical link to the peer device is unavailable. Trunks provide link failover when a member link becomes unavailable, and the peer switch connection supplies that physical link. Default routes do not affect link state, and media speed can be negotiated automatically.

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Topics covered
Determine resource utilizationIdentify network level performance issuesIdentify the reason load balancing is not working as expectedIdentify the reason a virtual server is not working as expectedIdentify the reason a pool is not working as expectedGiven a scenario, review basic stats to confirm functionalityGiven a scenario, interpret traffic flow
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