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101 · Question #42

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. A BIG-IP NAT translates the destination address of inbound packets from the NAT address to the origin address, while leaving the source address of the client unchanged.

Section 2: F5 Solutions and Technology

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 BIG-IP processes such packets.

Options

  • AThe source address would not change, but the destination address would be translated to the
  • BThe destination address would not change, but the source address would be translated to the
  • CThe source address would not change, but the destination address would be translated to the
  • DThe destination address would not change, but the source address would be translated to the

How the community answered

(53 responses)
  • A
    70% (37)
  • B
    15% (8)
  • C
    4% (2)
  • D
    11% (6)

Why each option

A BIG-IP NAT translates the destination address of inbound packets from the NAT address to the origin address, while leaving the source address of the client unchanged.

AThe source address would not change, but the destination address would be translated to theCorrect

When a client sends a packet to the BIG-IP NAT address, the BIG-IP performs destination NAT, replacing the destination IP (the NAT address) with the configured origin address so the packet reaches the real server. The client's source IP address is not modified by NAT processing - only the destination is changed. This differs from SNAT, which modifies the source address.

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

This describes SNAT behavior (translating the source address), not NAT behavior; a NAT definition on BIG-IP translates destination addresses for inbound traffic, not source addresses.

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

While this option also describes destination translation, the specific translation target or condition described differs from the correct inbound NAT behavior where the destination is changed to the origin address.

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

Leaving the destination unchanged and translating the source describes SNAT operation, not a NAT, which specifically performs destination address translation on client-initiated flows.

Concept tested: F5 BIG-IP NAT destination address translation behavior

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

Topics

#NAT#destination address translation#BIG-IP packet processing#origin address

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