F5-CTS-LTM BIG-IP Local Traffic Manager Practice Question
Exhibit
ltm persistence source-addr /Common/src_persist {
defaults-from /Common/source_addr
map-to-ipv6 enabled
timeout 180
}Refer to the exhibit. Why would an administrator enable 'map-to-ipv6' in a source-address persistence profile?
⚠ Common exam trap
Candidates frequently assume this feature is for IP address translation or security, missing that its primary purpose is to normalize IPv4 addresses into an IPv6 format for unified persistence table management.
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 creates a unified persistence table for both IPv4 and IPv6 clients.
In dual-stack environments, both IPv4 and IPv6 clients might access the same application. The 'map-to-ipv6' feature ensures that IPv4 addresses are normalized into an IPv6-compatible format within the persistence table. This creates a unified persistence context, allowing the BIG-IP to correctly track and persist traffic from both address types to the same backend server, maintaining session consistency across different network protocols.
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 forces all traffic to be converted to IPv6 for backend server processing.
Why it's wrong here
The BIG-IP does not automatically translate traffic to IPv6 for the backend servers. This setting only affects how the persistence table records client addresses. The traffic itself remains in its original IP format, ensuring compatibility with the existing backend server configuration and avoiding unexpected addressing issues.
- ✓
It creates a unified persistence table for both IPv4 and IPv6 clients.
Why this is correct
By enabling 'map-to-ipv6', the BIG-IP maps the IPv4 address into the IPv6 address space within the persistence table. This normalization allows the system to manage persistence entries for both protocol types in a single table, ensuring consistent load balancing behavior regardless of the client's source protocol.
- ✗
It allows the LTM to translate IPv6 client requests to IPv4 backend servers.
Why it's wrong here
IP translation is handled by NAT and SNAT configurations, not by persistence settings. 'map-to-ipv6' is strictly a persistence-table management function used for maintaining session affinity. It has no role in the routing or translation of actual data packets moving between the client and the backend server.
- ✗
It is required for performance optimization on the BIG-IP management plane.
Why it's wrong here
This feature is related to data plane traffic processing, specifically for maintaining persistence consistency. It has no impact on the BIG-IP management plane performance. Enabling it does not improve the speed or efficiency of system management tasks and is strictly limited to traffic-handling logic for persistence.
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
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