F5-CTS-LTM BIG-IP Local Traffic Manager Practice Question
A BIG-IP administrator creates a Standard Virtual Server with source address translation set to 'Automated Map'. During peak hours, clients behind a specific corporate NAT gateway experience intermittent connection drops. What is the mechanism and impact of 'Automated Map' in this scenario?
⚠ Common exam trap
Candidates frequently overlook the fact that 'Automated Map' consumes source ports from the self IP. They often assume it is a limitless translation method rather than one prone to port exhaustion.
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 uses the system self IP addresses as translation addresses, which can lead to port exhaustion under high connection rates.
Automated Map creates a temporary SNAT translation using available self IP addresses on the BIG-IP system. If traffic volume exhausts available source ports for a given self IP, connection attempts fail. High client concurrency through a shared NAT gateway exacerbates port exhaustion on the SNAT address, leading to dropped connections.
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 translates client source IPs using a dedicated SNAT pool, causing IP address collisions with upstream gateways.
Why it's wrong here
Automated Map utilizes existing self IP addresses rather than a separate SNAT pool, eliminating manual pool provisioning requirements. IP collisions are avoided because the BIG-IP manages port translation ranges dynamically on its own local interface addresses.
- ✗
It maps client source ports to a fixed range, restricting concurrent connections from individual subnet prefixes.
Why it's wrong here
Fixed port ranges are characteristic of static SNAT port translation modes rather than the dynamic Automated Map feature. Automated Map attempts to allocate available source ports across active self IPs as connection demand increases dynamically.
- ✓
It uses the system self IP addresses as translation addresses, which can lead to port exhaustion under high connection rates.
Why this is correct
Automated Map leverages internal self IP addresses to perform source address translation for incoming client sessions. When many clients share a single source IP through upstream NAT, port exhaustion occurs rapidly because each TCP socket requires a unique source port.
- ✗
It disables connection tracking, forcing clients to establish direct routing paths that bypass the internal firewall.
Why it's wrong here
Automated Map performs port-overloading SNAT using the virtual server's own address, so many clients sharing one NAT gateway collapse onto a single translated source port range, exhausting ports and dropping connections. It is tempting because SNAT is genuinely needed when servers must reply through the BIG-IP, but a SNAT Pool would be the correct choice here.
Visual reference
About these practice questions
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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
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.