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101 · Question #43

A standard virtual server is defined with a pool and a SNAT using automap. All other settings for the virtual server are at defaults. When client traffic is processed by the BIG-IP, what will occur to

The correct answer is B. Traffic initiated to the virtual server will have the destination address translated to a pool member. A standard virtual server with a pool translates the destination address of inbound client traffic from the virtual server IP to a pool member IP for load balancing.

Section 2: F5 Solutions and Technology

Question

A standard virtual server is defined with a pool and a SNAT using automap. All other settings for the virtual server are at defaults. When client traffic is processed by the BIG-IP, what will occur to the IP addresses.

Options

  • ATraffic initiated by the pool members will have the source address translated to a self-IP address
  • BTraffic initiated to the virtual server will have the destination address translated to a pool member
  • CTraffic initiated by selected clients, based on their IP address, will have the source address
  • DTraffic initiated to the virtual server will have the destination address translated to a pool member

How the community answered

(42 responses)
  • A
    17% (7)
  • B
    74% (31)
  • C
    5% (2)
  • D
    5% (2)

Why each option

A standard virtual server with a pool translates the destination address of inbound client traffic from the virtual server IP to a pool member IP for load balancing.

ATraffic initiated by the pool members will have the source address translated to a self-IP address

SNAT automap translates the source address of client-side traffic as seen by pool members, not traffic initiated by pool members themselves; pool members do not initiate the translation process.

BTraffic initiated to the virtual server will have the destination address translated to a pool memberCorrect

When a client sends traffic to the virtual server's IP (VIP), the BIG-IP translates the destination address from the VIP to the IP address of a selected pool member - this is the core function of a standard virtual server. The SNAT automap setting additionally translates the source address to a BIG-IP self-IP for the server-side connection, but the primary observable behavior for inbound traffic is the destination address change to a pool member.

CTraffic initiated by selected clients, based on their IP address, will have the source address

Source address translation of selected clients based on IP address describes a SNAT with an origin address list applied independently, not the behavior of a virtual server with automap where all traffic through the VIP is affected.

DTraffic initiated to the virtual server will have the destination address translated to a pool member

While this option is similar, it likely describes an incorrect or incomplete translation scenario - a standard virtual server always performs destination NAT to a pool member for all traffic processed through the VIP.

Concept tested: Standard virtual server destination address translation with SNAT automap

Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-local-traffic-management-getting-started-with-virtual-servers.html

Topics

#SNAT automap#virtual server#pool member#IP translation

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