When configuring _________, the interface leading to the External Virtual Router should be set as the main IP Address and should be publicly routable.

Question

Options

• AAnti-spoofing
• BNetwork Address Translation
• CA Virtual Switch
• DVLAN Trunking Interfaces
• EVirtual Systems in Bridge mode

• A
  3% (2)
• B
  75% (53)
• C
  3% (2)
• D
  13% (9)
• E
  7% (5)

Explanation

Network Address Translation requires a publicly routable IP on the external-facing interface because NAT's core function is translating private internal addresses to that public IP for outbound internet communication - without a routable address on the interface toward the External Virtual Router, translated packets cannot traverse the internet.

Why the distractors are wrong:

• A (Anti-spoofing) validates that traffic arrives on the expected interface per routing topology - it has no requirement for a "main IP" to be publicly routable.
• C (Virtual Switch) operates at Layer 2 and doesn't own IP addresses in the same way, making public routability irrelevant to its configuration.
• D (VLAN Trunking Interfaces) is about carrying multiple VLANs over a single link - it doesn't dictate which IP must be publicly routable.
• E (Virtual Systems in Bridge mode) works transparently at Layer 2, so it doesn't require a publicly routable interface IP the way a routed NAT configuration does.

Memory tip: NAT = "Need A Translation" to the public side - so the interface pointing out (toward the External Virtual Router) must carry the public IP that the internet can reach back.

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