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201 · Question #38

Assume a client's traffic is being processed only by a NAT; no SNAT or virtual server processing takes place. Also assume that the NAT definition specifies a NAT address and an origin address while al

The correct answer is A. The source address would not change, but the destination address would be translated to the origin address.. When a client initiates traffic to a NAT address on a BIG-IP, with no SNAT or virtual server processing, the BIG-IP will translate the destination address from the NAT address to the origin address.

Section 2: Configure Load Balancing Features

Question

Assume a client's traffic is being processed only by a NAT; no SNAT or virtual server processing takes place. Also assume that the NAT definition specifies a NAT address and an origin address while all other settings are left at their defaults. If a client were to initiate traffic to the NAT address, what changes, if any, would take place when the BIGIP processes such packets.

Options

  • AThe source address would not change, but the destination address would be translated to the origin address.
  • BThe destination address would not change, but the source address would be translated to the origin address.
  • CThe source address would not change, but the destination address would be translated to the NAT's
  • DThe destination address would not change, but the source address would be translated to the NAT's

How the community answered

(31 responses)
  • A
    77% (24)
  • B
    13% (4)
  • C
    6% (2)
  • D
    3% (1)

Why each option

When a client initiates traffic to a NAT address on a BIG-IP, with no SNAT or virtual server processing, the BIG-IP will translate the destination address from the NAT address to the origin address.

AThe source address would not change, but the destination address would be translated to the origin address.Correct

A NAT (Network Address Translation) rule on a BIG-IP is primarily designed to translate the destination IP address of incoming connections from a publicly exposed NAT address to an internal origin address. In this scenario, without SNAT, the source address of the client's packet remains unchanged, as the NAT's function is to handle the destination for inbound traffic.

BThe destination address would not change, but the source address would be translated to the origin address.

A NAT rule, by default and without SNAT, translates the destination address of inbound packets, not the source address, making this option incorrect.

CThe source address would not change, but the destination address would be translated to the NAT's

The destination address is translated *to* the specified origin address, not to the NAT's own address which is already the destination address in the client's initial packet, making this option incorrect.

DThe destination address would not change, but the source address would be translated to the NAT's

A NAT rule handles destination address translation, not source address translation, and specifically translates to the origin address, not the NAT's address, rendering this option incorrect.

Concept tested: Inbound NAT rule functionality

Source: https://techdocs.f5.com/en-us/big-ip-15-1-0/big-ip-tmos-implementations/network-address-translation-nats.html

Topics

#NAT#destination address translation#traffic processing

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