Which type of NAT allows both incoming and outgoing connections?

Question

Options

• AStatic NAT
• BPort NAT
• CBoth Static and Hide NAT
• DHide NAT

• A
  85% (22)
• B
  4% (1)
• C
  8% (2)
• D
  4% (1)

Explanation

Static NAT uses a permanent, one-to-one mapping between a private IP and a public IP, so external hosts always know the exact address to reach an internal server - enabling both inbound and outbound connections.

Hide NAT (D) maps many private IPs behind a single public IP using port tracking; because internal addresses are "hidden" and dynamically assigned, outside hosts have no stable address to initiate a connection to - outbound only.

Port NAT (B) is essentially the same mechanism as Hide NAT (PAT/overloading), sharing the same limitation: no predictable inbound target.

Option C is wrong because including Hide NAT disqualifies it - Hide NAT fundamentally cannot support unsolicited incoming connections.

Memory tip: Think "Static = Stable = bidirectional." A static mapping never changes, so it acts like a permanent entry in a phone book - anyone can call in or out.

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