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101 · Question #449

Which two of the following statements about how TMOS typically manages traffic between a client and server are accurate? (Choose two.)

The correct answer is B. It changes the destination address before sending a response to the client. D. It changes the source address before forwarding a request to the server.. TMOS in full-proxy mode typically changes the source address before forwarding a request to the server and the destination address before sending the response back to the client.

Section 3: Load Balancing and High Availability Basics

Question

Which two of the following statements about how TMOS typically manages traffic between a client and server are accurate? (Choose two.)

Options

  • AIt changes the destination address before forwarding a request to the server.
  • BIt changes the destination address before sending a response to the client.
  • CIt changes the source address before sending a response to the client.
  • DIt changes the source address before forwarding a request to the server.

How the community answered

(23 responses)
  • A
    13% (3)
  • B
    70% (16)
  • C
    17% (4)

Why each option

TMOS in full-proxy mode typically changes the source address before forwarding a request to the server and the destination address before sending the response back to the client.

AIt changes the destination address before forwarding a request to the server.

Changing the destination from the virtual IP to a pool member address is handled by virtual server selection and is a basic load-balancing step rather than the SNAT-specific address management behavior this question addresses.

BIt changes the destination address before sending a response to the client.Correct

On the return path, the pool member sends its response to the BIG-IP self IP or SNAT address rather than directly to the client, so TMOS must change the destination address from the SNAT or self IP back to the actual client IP before forwarding the response.

CIt changes the source address before sending a response to the client.

Translating the source on a response from the pool member IP to the virtual IP is a standard virtual server behavior on the return path, not the primary address change tied to TMOS SNAT-based traffic management described here.

DIt changes the source address before forwarding a request to the server.Correct

When forwarding a request to a pool member, TMOS changes the source address from the client IP to the BIG-IP self IP or SNAT IP so that the pool member response is directed back through BIG-IP and not returned directly to the client.

Concept tested: TMOS full-proxy SNAT traffic address translation

Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-local-traffic-management-getting-started-guide/how-big-ip-local-traffic-manager-works.html

Topics

#TMOS traffic management#address translation#request forwarding#response handling

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