Question 265 of 528

Firewall Zone Default Behaviors in firewalld

This EX294 practice question tests your understanding of create content collections and execution environments. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Match each firewall zone to its default behavior.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

public: Rejects incoming traffic except for explicitly allowed services.

Common firewalld zones include public (default deny), trusted (allow all), external (NAT with limited inbound), dmz (limited inbound for public servers), internal (trusted but filtered), and drop (silent discard). Common confusions involve swapping the behaviors of public and trusted, or misunderstanding dmz as fully blocking instead of selectively allowing.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • public: Rejects incoming traffic except for explicitly allowed services.

    Why this is correct

    The public zone is the default for untrusted networks; it denies incoming traffic unless explicitly permitted.

    Related concept

    Static NAT maps one inside address to one outside address.

  • trusted: Accepts all incoming traffic.

    Why this is correct

    The trusted zone is for fully trusted networks; no filtering is applied to incoming traffic.

    Related concept

    Static NAT maps one inside address to one outside address.

  • internal: Allows all incoming traffic from any source.

    Why it's wrong here

    Incorrect — the internal zone allows traffic from the same network but still applies some filtering.

  • dmz: Drops all incoming traffic.

    Why it's wrong here

    Incorrect — the dmz zone allows specific services (e.g., SSH, HTTP) and rejects others.

  • external: Masquerades outgoing traffic and rejects incoming except for allowed.

    Why this is correct

    The external zone is used for internet-facing interfaces with NAT; it allows only explicitly permitted incoming connections.

    Related concept

    Static NAT maps one inside address to one outside address.

  • drop: Drops all incoming traffic silently (no response).

    Why this is correct

    The drop zone discards all incoming packets without any response, acting as a black hole.

    Related concept

    Static NAT maps one inside address to one outside address.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

  • Static NAT maps one inside address to one outside address.
  • PAT allows many inside hosts to share one public address using ports.
  • Inside local and inside global describe the private and translated addresses.
  • NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

  • Identify inside and outside interfaces first.
  • Check whether the scenario needs static NAT, dynamic NAT or PAT.
  • Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

Visual reference

Inside (Private) PC-A 10.0.0.1 PC-B 10.0.0.2 NAT Router Outside (Public) 203.0.113.1 Inside Global Server PAT: many private IPs share one public IP via unique port numbers

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related EX294 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this EX294 question test?

Create content collections and execution environments — This question tests Create content collections and execution environments — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: public: Rejects incoming traffic except for explicitly allowed services. — Common firewalld zones include public (default deny), trusted (allow all), external (NAT with limited inbound), dmz (limited inbound for public servers), internal (trusted but filtered), and drop (silent discard). Common confusions involve swapping the behaviors of public and trusted, or misunderstanding dmz as fully blocking instead of selectively allowing.

What should I do if I get this EX294 question wrong?

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related EX294 NAT questions on configuration and troubleshooting.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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Last reviewed: Jun 11, 2026

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