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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.

Section 5: Application Delivery Basics

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)
  • A
    90% (26)
  • B
    7% (2)
  • D
    3% (1)

Why each option

This question tests knowledge of how BIG-IP SNAT automap selects translation addresses compared to SNAT pools.

ASNAT s using automap preferentially translate source addresses to nonfloating self-IP addresses.Correct

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.

BSNAT s using a SNAT pool translate source addresses randomly to any of the addresses in the

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.

CSNAT s using automap translate source addresses randomly to any of the BIG-IP's floating self-

Automap does not preferentially use floating self-IPs; it actively prefers nonfloating self-IPs to ensure return traffic symmetry on the originating device.

DA SNAT pool can contain virtual server addresses.

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

Topics

#SNAT#SNAT pool#automap#source address translation

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