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Question 83 of 1,052
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CCNA Practice Question: Which TWO statements correctly describe the…
This 200-301 practice question tests your understanding of 200-301 exam topics. 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.
Which TWO statements correctly describe the behavior of Root Guard, Loop Guard, and BPDU Guard in a Rapid PVST+ environment?
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
✓
Root Guard is applied to a port that should never become a root port; if a superior BPDU is received, the port is placed into a root-inconsistent state.
Root Guard prevents a port from becoming a root port by disabling the port if it receives a superior BPDU. Loop Guard prevents alternate/backup ports from transitioning to forwarding when no BPDUs are received, thus avoiding bridging loops. BPDU Guard is typically applied to access ports and error-disables the port if a BPDU is received, which protects against unauthorized switches. The correct answers reflect these primary functions.
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.
- ✓
Root Guard is applied to a port that should never become a root port; if a superior BPDU is received, the port is placed into a root-inconsistent state.
Why this is correct
Root Guard forces a port to be a designated port. When a superior BPDU is received, the port enters a root-inconsistent (blocked) state to prevent it from becoming a root port.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Loop Guard is used on root ports to monitor BPDU reception; if BPDUs stop, the port is immediately placed into forwarding mode to maintain connectivity.
Why it's wrong here
This is incorrect. Loop Guard is applied to alternate or backup ports (non-designated ports), not root ports. When BPDUs stop, the port is placed into a loop-inconsistent (blocked) state, not forwarding.
- ✓
BPDU Guard is typically configured on access ports and error-disables the port if a BPDU is received, protecting against unauthorized switch connections.
Why this is correct
BPDU Guard is designed for access ports. If a BPDU is received (indicating a potential switch connection), the port is error-disabled, preventing bridging loops and unauthorized access.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Root Guard and BPDU Guard can be enabled simultaneously on the same port to provide both root protection and BPDU filtering.
Why it's wrong here
This is incorrect. Root Guard and BPDU Guard have conflicting effects on a port. Root Guard allows BPDU processing (to detect superior BPDUs), while BPDU Guard disables the port upon receiving any BPDU. They cannot be used together on the same port.
- ✓
Loop Guard is only effective when configured on ports that are in a blocking state; it prevents them from transitioning to forwarding if BPDUs are not received.
Why this is correct
Loop Guard is applied to ports that are in a blocking state (alternate or backup ports). If BPDUs stop arriving, the port stays in a loop-inconsistent state (blocked) rather than transitioning to forwarding, thus preventing loops.
Related concept
Static NAT maps one inside address to one outside address.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Root Guard is applied to a port that should never become a root port; if a superior BPDU is received, the port is placed into a root-inconsistent state.Correct answer▾
Why this is correct
Root Guard forces a port to be a designated port. When a superior BPDU is received, the port enters a root-inconsistent (blocked) state to prevent it from becoming a root port.
✗Loop Guard is used on root ports to monitor BPDU reception; if BPDUs stop, the port is immediately placed into forwarding mode to maintain connectivity.Wrong answer — click to see why▾
Why this is wrong here
Loop Guard prevents loops by keeping blocked ports from transitioning to forwarding when BPDUs are lost; it does not force them to forward.
✗Root Guard and BPDU Guard can be enabled simultaneously on the same port to provide both root protection and BPDU filtering.Wrong answer — click to see why▾
Why this is wrong here
They are mutually exclusive because Root Guard requires the port to process BPDUs, whereas BPDU Guard error-disables the port upon receiving a BPDU.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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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FAQ
Questions learners often ask
What does this 200-301 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Root Guard is applied to a port that should never become a root port; if a superior BPDU is received, the port is placed into a root-inconsistent state. — Root Guard prevents a port from becoming a root port by disabling the port if it receives a superior BPDU. Loop Guard prevents alternate/backup ports from transitioning to forwarding when no BPDUs are received, thus avoiding bridging loops. BPDU Guard is typically applied to access ports and error-disables the port if a BPDU is received, which protects against unauthorized switches. The correct answers reflect these primary functions.
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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