101 · Question #69
Which statement is true concerning SNATs using SNAT pools and SNATs using automap?
The correct answer is A. SNAT s using automap preferentially translate source addresses to nonfloating self-IP addresses.. This question tests knowledge of how BIG-IP SNAT automap selects translation addresses compared to SNAT pools.
Question
Which statement is true concerning SNATs using SNAT pools and SNATs using automap?
Options
- ASNAT s using automap preferentially translate source addresses to nonfloating self-IP addresses.
- BSNAT s using a SNAT pool translate source addresses randomly to any of the addresses in the
- CSNAT s using automap translate source addresses randomly to any of the BIG-IP's floating self-
- DA SNAT pool can contain virtual server addresses.
How the community answered
(29 responses)- A90% (26)
- B7% (2)
- D3% (1)
Why each option
This question tests knowledge of how BIG-IP SNAT automap selects translation addresses compared to SNAT pools.
BIG-IP automap SNATs preferentially use nonfloating (local) self-IP addresses for source address translation rather than floating self-IPs. This is by design so that return traffic is directed back to the same device that translated the outbound traffic. Floating self-IPs are used as a fallback only if no nonfloating self-IP exists on the egress VLAN.
SNAT pools do not translate sources randomly to any address in the pool - BIG-IP uses a deterministic selection method (such as least-connections) rather than purely random selection, and the choice text is incomplete.
Automap does not preferentially use floating self-IPs; it actively prefers nonfloating self-IPs to ensure return traffic symmetry on the originating device.
SNAT pool members must be routable IP addresses dedicated for translation, not virtual server addresses, which serve a different purpose as traffic destinations.
Concept tested: BIG-IP SNAT automap vs SNAT pool address selection
Source: https://techdocs.f5.com/en-us/bigip-16-1-0/big-ip-local-traffic-management-address-translation/snat-introduction.html
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