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101 · Question #1

101 Question #1: Real Exam Question with Answer & Explanation

The correct answer is C: The source address would be changed to the NAT address and destination address would be left. On F5 BIG-IP, when an origin server initiates outbound traffic processed by a NAT, the source address is translated from the origin address to the NAT address, while the destination address remains 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 the origin server were to initiate traffic via the BIG-IP, what changes, if any, would take place when the BIG-IP processes such packets.

Options

  • AThe BIG-IP would drop the request since the traffic didn arrive destined to the NAT address.
  • BThe source address would not change, but the destination address would be changed to the NAT
  • CThe source address would be changed to the NAT address and destination address would be left
  • DThe source address would not change, but the destination address would be changed to a self-IP

Explanation

On F5 BIG-IP, when an origin server initiates outbound traffic processed by a NAT, the source address is translated from the origin address to the NAT address, while the destination address remains unchanged.

Common mistakes.

  • A. The BIG-IP does not drop origin-initiated packets; NATs on BIG-IP operate bidirectionally, processing traffic whether it arrives destined to the NAT address or sourced from the origin address.
  • B. When the origin server initiates traffic, it is the source address (origin address) that gets changed to the NAT address, not the destination; this choice incorrectly states the source remains unchanged.
  • D. The BIG-IP does not change the destination to a self-IP during NAT processing; self-IPs are not substituted as destinations in NAT translations.

Concept tested. F5 BIG-IP NAT bidirectional address translation behavior

Reference. https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-local-traffic-management-basics/nat.html

Topics

#NAT#source address translation#BIG-IP traffic processing#origin server

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Assume a client's traffic is being processed only by a NAT; no... | 101 Q#1 Answer | NerdExam