Question 1mediummulti select
Full question →- → Why each wrong option is wrong in this specific scenario
- → When each wrong option would be correct
- → Real-world analogy and exam trap analysis
- → Related glossary terms and similar practice questions
Question 926 of 1,052
mediummulti selectObjective-mapped
CCNA Practice Question: Which TWO of the following statements accurately…
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 of the following statements accurately describe the configuration and behavior of Root Guard, Loop Guard, and BPDU Guard in Rapid PVST+ environments?
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, when enabled on a port, prevents that port from becoming the root port by placing it in a root-inconsistent state if a superior BPDU is received.
Root Guard and BPDU Guard are port-level STP protections. Root Guard prevents a port from becoming a root port, forcing it into a root-inconsistent state if a superior BPDU is received. BPDU Guard shuts down a port if any BPDU is received, typically used on access ports. Loop Guard prevents alternate or root ports from becoming designated when BPDUs stop arriving, by putting the port into a loop-inconsistent state. Options A and D correctly describe these behaviors. Option B is wrong because Root Guard does not shut down the port; it transitions to root-inconsistent. Option C is wrong because Loop Guard does not disable the port; it blocks traffic until BPDUs resume. Option E is wrong because BPDU Guard disables the port via errdisable, not by placing it in an inconsistent state.
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, when enabled on a port, prevents that port from becoming the root port by placing it in a root-inconsistent state if a superior BPDU is received.
Why this is correct
Root Guard ensures the designated port does not become a root port. Upon receiving a superior BPDU, the port enters a root-inconsistent state, blocking traffic until the superior BPDUs stop.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Root Guard automatically shuts down the port when a superior BPDU is received, similar to BPDU Guard.
Why it's wrong here
Root Guard does not shut down the port; it places the port in a root-inconsistent state, which effectively blocks traffic but does not disable the port. BPDU Guard, on the other hand, errdisables the port.
- ✗
Loop Guard, when enabled, disables a port if BPDUs are no longer received on it, preventing a unidirectional link failure.
Why it's wrong here
Loop Guard does not disable the port; it places the port into a loop-inconsistent state, blocking traffic on that port until BPDUs are received again. The port remains administratively up.
- ✓
BPDU Guard, when enabled, puts the port in an errdisable state if a BPDU is received, which is typically used on access ports to prevent unauthorized switches from connecting.
Why this is correct
BPDU Guard is designed to protect against rogue switches. If any BPDU arrives on a port with BPDU Guard, the port is immediately errdisabled, requiring manual or automatic recovery.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
BPDU Guard places the port in a blocking state (loop-inconsistent) when a BPDU is received, similar to Loop Guard.
Why it's wrong here
BPDU Guard errdisables the port, not just blocks it. Loop Guard uses a loop-inconsistent state, which is different from errdisable. BPDU Guard is a more severe reaction.
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, when enabled on a port, prevents that port from becoming the root port by placing it in a root-inconsistent state if a superior BPDU is received.Correct answer▾
Why this is correct
Root Guard ensures the designated port does not become a root port. Upon receiving a superior BPDU, the port enters a root-inconsistent state, blocking traffic until the superior BPDUs stop.
✗Root Guard automatically shuts down the port when a superior BPDU is received, similar to BPDU Guard.Wrong answer — click to see why▾
Why this is wrong here
Root Guard does not shut down the port; it places the port in a root-inconsistent state, which effectively blocks traffic but does not disable the port. BPDU Guard, on the other hand, errdisables the port.
✗Loop Guard, when enabled, disables a port if BPDUs are no longer received on it, preventing a unidirectional link failure.Wrong answer — click to see why▾
Why this is wrong here
Loop Guard does not disable the port; it places the port into a loop-inconsistent state, blocking traffic on that port until BPDUs are received again. The port remains administratively up.
✗BPDU Guard places the port in a blocking state (loop-inconsistent) when a BPDU is received, similar to Loop Guard.Wrong answer — click to see why▾
Why this is wrong here
BPDU Guard errdisables the port, not just blocks it. Loop Guard uses a loop-inconsistent state, which is different from errdisable. BPDU Guard is a more severe reaction.
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.
Related practice questions
Related 200-301 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
CCNA subnetting practice questions
Practise IPv4 subnetting, CIDR, masks, host ranges and subnet selection.
CCNA OSPF practice questions
Practise OSPF neighbours, router IDs, metrics, areas and routing-table interpretation.
CCNA VLAN practice questions
Practise VLANs, access ports, trunks, allowed VLANs and switching scenarios.
CCNA STP practice questions
Practise spanning tree, root bridge election, port roles and STP troubleshooting.
CCNA EtherChannel practice questions
Practise LACP, PAgP, port-channel behaviour and bundle requirements.
CCNA ACL practice questions
Practise standard and extended ACLs, permit/deny logic and traffic filtering.
CCNA NAT practice questions
Practise static NAT, dynamic NAT, PAT and inside/outside address translation.
CCNA DHCP practice questions
Practise DHCP scopes, relay, leases and troubleshooting.
CCNA show ip route practice questions
Practise routing-table output, longest-prefix match, AD and route selection.
CCNA show interfaces trunk practice questions
Practise trunk verification and VLAN forwarding across switches.
CCNA wireless security practice questions
Practise WLAN security, authentication and wireless architecture concepts.
CCNA IPv6 practice questions
Practise IPv6 addressing, routes, neighbour discovery and common IPv6 exam traps.
Practice this exam
Start a free 200-301 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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, when enabled on a port, prevents that port from becoming the root port by placing it in a root-inconsistent state if a superior BPDU is received. — Root Guard and BPDU Guard are port-level STP protections. Root Guard prevents a port from becoming a root port, forcing it into a root-inconsistent state if a superior BPDU is received. BPDU Guard shuts down a port if any BPDU is received, typically used on access ports. Loop Guard prevents alternate or root ports from becoming designated when BPDUs stop arriving, by putting the port into a loop-inconsistent state. Options A and D correctly describe these behaviors. Option B is wrong because Root Guard does not shut down the port; it transitions to root-inconsistent. Option C is wrong because Loop Guard does not disable the port; it blocks traffic until BPDUs resume. Option E is wrong because BPDU Guard disables the port via errdisable, not by placing it in an inconsistent state.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More 200-301 practice questions
- A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that w…
- A switch has DHCP snooping enabled, but users still experience IP-to-MAC spoofing attacks. Which additional feature shou…
- Switch SW1 sends traffic for VLAN 30 across a trunk to SW2, but hosts in VLAN 30 on SW2 cannot communicate with hosts in…
- What problem is HSRP designed to solve?
- Which DHCP message does the client send to formally accept an offered address?
- What metric does RIP use to choose the best path?
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Loading comments…
Sign in to join the discussion.
This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.