F5-CTS-LTM BIG-IP Local Traffic Manager Practice Question
What is the primary function of a BIG-IP LTM monitor?
⚠ Common exam trap
Candidates often confuse monitors with load balancing methods or persistence profiles, incorrectly assuming that monitors actively route traffic or maintain session state rather than simply checking for backend server health.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To determine the availability of a pool member.
Monitors are used to verify the operational status and health of backend pool members. By periodically checking specific services, the BIG-IP ensures that traffic is only sent to functional servers. This prevents black-holing traffic and maintains high availability, as the BIG-IP will automatically stop sending requests to any member that fails its configured health check, providing seamless failover for users.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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To encrypt traffic between the client and the BIG-IP.
Why it's wrong here
Encryption is the function of an SSL profile, not a monitor. Profiles handle the cryptographic handshake and data encryption/decryption, whereas monitors are strictly concerned with service availability and health. Using a monitor for encryption would be conceptually incorrect in the context of the BIG-IP architecture.
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To balance traffic load across multiple pool members.
Why it's wrong here
Load balancing algorithms, such as Round Robin or Least Connections, are responsible for distributing traffic. The monitor simply provides the status of the members to the load balancer, which then makes the decision of where to send the traffic based on the available, healthy nodes.
- ✓
To determine the availability of a pool member.
Why this is correct
The primary role of a monitor is to perform health checks on pool members. If a check fails, the monitor marks the member as 'down' and removes it from the load balancing pool, ensuring that traffic is redirected only to healthy, operational servers in the infrastructure.
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To translate source IP addresses for outgoing traffic.
Why it's wrong here
Source IP translation is handled by SNAT (Secure Network Address Translation) or NAT objects. Monitors are strictly passive or active diagnostic tools that assess the health of a target device and do not participate in the path translation or routing of actual user data traffic.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official F5 exam blueprint
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