F5-CTS-LTM BIG-IP Local Traffic Manager Practice Question
Exhibit
ltm persistence cookie cookie_persistence { mode insert } ltm virtual vs_web { pool p_web profiles { http {} } }Refer to the exhibit. The administrator wants to use cookie persistence, but it is not working. What is missing from the configuration?
⚠ Common exam trap
Candidates assume that creating a profile automatically applies it to the virtual server. They forget that the profile must be explicitly selected within the virtual server's resource configuration settings.
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
✓
The virtual server is missing a default persistence profile.
The cookie persistence profile is defined but not actually attached to the virtual server. In BIG-IP LTM, simply creating a profile is not enough; it must be explicitly assigned to the virtual server under the 'persistence' section of the virtual server configuration. Without this assignment, the LTM does not know to inject the cookie into the response headers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The virtual server is missing a default persistence profile.
Why this is correct
Even if the profile exists in the configuration, it must be assigned to the virtual server's persistence settings. Without this linkage, the BIG-IP will use the default load balancing algorithm for every request, completely ignoring the persistence profile, which is a common configuration oversight for new virtual servers.
- ✗
The cookie profile mode must be set to 'rewrite'.
Why it's wrong here
The 'insert' mode is the standard and most reliable method for cookie persistence, as it allows the BIG-IP to add its own cookie without relying on the backend server. The 'rewrite' mode is for modifying existing cookies, which is not required for basic session persistence functionality.
- ✗
The HTTP profile needs to be set to 'oneconnect'.
Why it's wrong here
OneConnect is for connection optimization and has no functional requirement or relationship with cookie persistence. Associating the two is unnecessary and does not solve the underlying issue of the persistence profile not being applied correctly to the virtual server's configuration, which is the primary cause here.
- ✗
The virtual server requires an iRule to parse the cookie.
Why it's wrong here
Cookie persistence is a built-in feature of the LTM module and does not require an iRule. The BIG-IP handles the cookie insertion and parsing automatically once the profile is correctly assigned to the virtual server. Using an iRule for this would be redundant and inefficient.
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.