- A
1. Configure Root Guard on designated ports. 2. Configure Loop Guard on non-designated ports. 3. Configure BPDU Guard on PortFast ports. 4. Enable errdisable recovery globally. 5. Re-enable the err-disabled port manually.
This is the correct order: Root Guard is applied to designated ports to prevent them from becoming root ports; Loop Guard is applied to non-designated ports to prevent alternate/backup ports from transitioning to forwarding in case of BPDU loss; BPDU Guard is applied to PortFast ports to protect against unexpected BPDUs. Recovery involves enabling global errdisable recovery and then manually re-enabling the port.
- B
1. Configure Loop Guard on designated ports. 2. Configure Root Guard on non-designated ports. 3. Configure BPDU Guard on PortFast ports. 4. Re-enable the err-disabled port manually. 5. Enable errdisable recovery globally.
This is incorrect because Loop Guard should be applied to non-designated ports, not designated ports, and Root Guard should be applied to designated ports, not non-designated ports. Also, recovery steps are reversed: global recovery should be enabled before manual re-enablement.
- C
1. Configure BPDU Guard on PortFast ports. 2. Configure Root Guard on designated ports. 3. Configure Loop Guard on non-designated ports. 4. Re-enable the err-disabled port manually. 5. Enable errdisable recovery globally.
This is incorrect because BPDU Guard is typically configured after the other STP protections, and the recovery steps are reversed: global recovery should be enabled before manual re-enablement.
- D
1. Configure Root Guard on non-designated ports. 2. Configure Loop Guard on designated ports. 3. Configure BPDU Guard on PortFast ports. 4. Enable errdisable recovery globally. 5. Re-enable the err-disabled port manually.
This is incorrect because Root Guard should be on designated ports, not non-designated, and Loop Guard should be on non-designated ports, not designated. The recovery steps are correct in order but the protection assignments are swapped.
CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Drag and drop the following steps into the correct order to configure Root Guard on designated ports, Loop Guard on non-designated ports, and BPDU Guard on PortFast ports, and then recover a port that enters err-disabled state.
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
1. Configure Root Guard on designated ports. 2. Configure Loop Guard on non-designated ports. 3. Configure BPDU Guard on PortFast ports. 4. Enable errdisable recovery globally. 5. Re-enable the err-disabled port manually.
The correct sequence applies STP protections to their proper port roles: Root Guard on designated ports to prevent unexpected superior BPDUs, Loop Guard on non-designated ports to prevent unidirectional link failure from causing loops, and BPDU Guard on PortFast ports to block rogue switches. Distractors B and D are wrong because they mismatch the guard types to port roles (e.g., B puts Loop Guard on designated, Root Guard on non-designated; D does the opposite). Distractor C incorrectly reverses the recovery steps by re-enabling the port before enabling errdisable recovery globally, and it also reorders protection configuration without logical benefit.
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.
- ✓
1. Configure Root Guard on designated ports. 2. Configure Loop Guard on non-designated ports. 3. Configure BPDU Guard on PortFast ports. 4. Enable errdisable recovery globally. 5. Re-enable the err-disabled port manually.
Why this is correct
This is the correct order: Root Guard is applied to designated ports to prevent them from becoming root ports; Loop Guard is applied to non-designated ports to prevent alternate/backup ports from transitioning to forwarding in case of BPDU loss; BPDU Guard is applied to PortFast ports to protect against unexpected BPDUs. Recovery involves enabling global errdisable recovery and then manually re-enabling the port.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
1. Configure Loop Guard on designated ports. 2. Configure Root Guard on non-designated ports. 3. Configure BPDU Guard on PortFast ports. 4. Re-enable the err-disabled port manually. 5. Enable errdisable recovery globally.
Why this is correct
This is incorrect because Loop Guard should be applied to non-designated ports, not designated ports, and Root Guard should be applied to designated ports, not non-designated ports. Also, recovery steps are reversed: global recovery should be enabled before manual re-enablement.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
1. Configure BPDU Guard on PortFast ports. 2. Configure Root Guard on designated ports. 3. Configure Loop Guard on non-designated ports. 4. Re-enable the err-disabled port manually. 5. Enable errdisable recovery globally.
Why this is correct
This is incorrect because BPDU Guard is typically configured after the other STP protections, and the recovery steps are reversed: global recovery should be enabled before manual re-enablement.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
1. Configure Root Guard on non-designated ports. 2. Configure Loop Guard on designated ports. 3. Configure BPDU Guard on PortFast ports. 4. Enable errdisable recovery globally. 5. Re-enable the err-disabled port manually.
Why this is correct
This is incorrect because Root Guard should be on designated ports, not non-designated, and Loop Guard should be on non-designated ports, not designated. The recovery steps are correct in order but the protection assignments are swapped.
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.
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 200-301 NAT questions on configuration and troubleshooting.
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Switching and Network Access — study guide chapter
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FAQ
Questions learners often ask
What does this 200-301 question test?
Switching and Network Access — This question tests Switching and Network Access — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: 1. Configure Root Guard on designated ports. 2. Configure Loop Guard on non-designated ports. 3. Configure BPDU Guard on PortFast ports. 4. Enable errdisable recovery globally. 5. Re-enable the err-disabled port manually. — The correct sequence applies STP protections to their proper port roles: Root Guard on designated ports to prevent unexpected superior BPDUs, Loop Guard on non-designated ports to prevent unidirectional link failure from causing loops, and BPDU Guard on PortFast ports to block rogue switches. Distractors B and D are wrong because they mismatch the guard types to port roles (e.g., B puts Loop Guard on designated, Root Guard on non-designated; D does the opposite). Distractor C incorrectly reverses the recovery steps by re-enabling the port before enabling errdisable recovery globally, and it also reorders protection configuration without logical benefit.
What should I do if I get this 200-301 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 200-301 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 6, 2026
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