101 · Question #214
Which statement is true concerning SNATs using automap.
The correct answer is C. A SNAT using automap will preferentially use a floating self-IP over a nonfloating self-IP.. SNAT automap on BIG-IP preferentially selects a floating self-IP over a non-floating self-IP to ensure traffic is translated to an address that moves with the active unit during an HA failover.
Question
Which statement is true concerning SNATs using automap.
Options
- AOnly specified self-IP addresses are used as automap addresses.
- BSNATs using automap will translate all client addresses to an automap address.
- CA SNAT using automap will preferentially use a floating self-IP over a nonfloating self-IP.
- DA SNAT using automap can be used to translate the source address of all outgoing traffic to the
How the community answered
(50 responses)- A4% (2)
- C94% (47)
- D2% (1)
Why each option
SNAT automap on BIG-IP preferentially selects a floating self-IP over a non-floating self-IP to ensure traffic is translated to an address that moves with the active unit during an HA failover.
Automap does not restrict translation to specified self-IPs; it automatically selects from all self-IPs on the egress VLAN, preferring floating ones.
Automap only translates addresses for traffic that matches the SNAT's configured origin address list, not all client addresses that traverse the BIG-IP.
When automap is used, BIG-IP selects a self-IP on the egress VLAN to use as the translated source address. It prefers floating self-IPs because floating addresses migrate to the active unit during an HA failover, ensuring that pool members can return traffic to the correct device without stale connections. Using a non-floating self-IP could result in asymmetric routing after a failover event.
Translating all outgoing traffic to a single address describes a wildcard SNAT or a SNAT pool, not the specific behavior of SNAT automap.
Concept tested: SNAT automap floating self-IP preference in HA configurations
Source: https://support.f5.com/csp/article/K7820
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