F5-CTS-LTM BIG-IP Local Traffic Manager Practice Question
A client is experiencing intermittent connection failures. You suspect the BIG-IP is SNATing traffic. If the SNAT pool is exhausted, what behavior will the BIG-IP exhibit?
⚠ Common exam trap
Candidates often misinterpret SNAT exhaustion as a backend server crash. They fail to realize that the BIG-IP is dropping traffic before it ever reaches the pool because it cannot perform the translation.
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
✓
It will drop new incoming connections from clients.
SNAT pool exhaustion occurs when the BIG-IP runs out of available source ports to translate client connections. When this happens, new requests from clients will be dropped or rejected because the LTM cannot map the connection to a valid source IP/port combination. Identifying this is crucial during performance troubleshooting, as it often masquerades as generic network connectivity issues or server-side application errors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It will automatically increase the SNAT pool size.
Why it's wrong here
The BIG-IP does not dynamically scale SNAT pool sizes. The administrator must manually define the number of addresses in the pool. If the limit is reached, the system will continue to experience connection failures until additional addresses are added or the timeout settings are lowered to reclaim ports.
- ✓
It will drop new incoming connections from clients.
Why this is correct
When all available source ports in the SNAT pool are utilized, the LTM cannot translate the next incoming request. Consequently, the BIG-IP will drop the connection. Monitoring SNAT pool utilization is essential for ensuring that the number of concurrent connections does not exceed the platform's port capacity.
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It will bypass the SNAT pool and use the Self-IP.
Why it's wrong here
The BIG-IP will not automatically failover to a Self-IP if the SNAT pool is exhausted. It strictly follows the defined SNAT configuration. If the SNAT is mandatory for the traffic flow, the exhaustion of the pool results in a total block of new sessions for that VIP.
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It will rotate the source IP to the next available virtual address.
Why it's wrong here
SNAT translation is specific to the defined SNAT pool or the configured Auto Map setting. The BIG-IP does not arbitrarily select other virtual addresses for translation. This would break session integrity and security policies, as backend servers expect traffic from the defined SNAT source range.
About these practice questions
This F5-CTS-LTM question is part of Courseiva's 119-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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
This F5-CTS-LTM practice question is part of Courseiva's free F5 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the F5-CTS-LTM exam.