- A
Root bridge: Bridge with the lowest bridge ID in the STP topology
The root bridge is the central reference point for all STP calculations; all bridges in the network elect a single root bridge based on the lowest bridge ID.
- B
Designated port: Port that has the best path to the root bridge on a segment
This is incorrect because a designated port is the port on a segment that has the best path to the root bridge; it is not the central reference point.
- C
Alternate port: Port that provides an alternate path to the root bridge in Rapid PVST+
This is incorrect because an alternate port is a backup port that provides an alternative path to the root bridge; it is not the central reference point.
- D
Edge port: Port that connects to an end device and can transition directly to forwarding
This is incorrect because Rapid PVST+ is a Cisco enhancement of STP that provides faster convergence, not the central reference point.
Quick Answer
The answer is Alternate port, which provides an alternate path to the root bridge in Rapid PVST+. This is correct because in Rapid PVST+, an alternate port is a blocked port that receives a superior BPDU from another switch, offering a backup path to the root bridge that is immediately available if the root port fails—unlike a backup port, which provides redundancy to a shared segment. On the CCNA 200-301 v2 exam, this distinction appears in drag-and-drop tasks testing your ability to match STP port roles to their definitions, often tripping candidates who confuse alternate with backup. A common trap is thinking alternate ports are only in classic STP; remember that Rapid PVST+ uses alternate and backup roles explicitly, while classic STP simply calls them blocking ports. For a quick memory tip, think “Alternate = Alternative route to the root,” and “Backup = Backup for your own port on a shared link.”
CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. 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.
Drag and drop the STP/Rapid PVST+ terms on the left to the correct descriptions on the right.
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 bridge: Bridge with the lowest bridge ID in the STP topology
These definitions match standard STP/Rapid PVST+ terminology.
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 bridge: Bridge with the lowest bridge ID in the STP topology
- ✓
Designated port: Port that has the best path to the root bridge on a segment
Why this is correct
This is incorrect because a designated port is the port on a segment that has the best path to the root bridge; it is not the central reference point.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Alternate port: Port that provides an alternate path to the root bridge in Rapid PVST+
Why this is correct
This is incorrect because an alternate port is a backup port that provides an alternative path to the root bridge; it is not the central reference point.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Edge port: Port that connects to an end device and can transition directly to forwarding
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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Switching and Network Access practice questions
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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: Root bridge: Bridge with the lowest bridge ID in the STP topology — These definitions match standard STP/Rapid PVST+ terminology.
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 →
Same concept, more angles
2 more ways this is tested on 200-301
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the STP-related terms on the left to their correct descriptions on the right.
medium- ✓ A.Root Bridge: The bridge with the lowest bridge ID in the STP topology
- ✓ B.Designated Port: The port on a network segment with the best path to the root bridge
- ✓ C.Blocking State: A port state that prevents forwarding of data to avoid loops
- ✓ D.Bridge Protocol Data Units: Frames exchanged by switches to share STP information
Why A: These pairings correctly match STP terms with their standard definitions as used in networking certifications.
Variation 2. Drag and drop the STP port roles on the left to their descriptions on the right.
medium- ✓ A.Root port: Provides the best path to the root bridge from a non-root switch.
- B.Designated port: Provides a backup path to the root bridge in case the root port fails.
- C.Alternate port: Provides a backup path to the root bridge when the root port fails.
- D.Backup port: Provides a backup path for the root port when the root port fails.
Why A: In STP/RSTP, root ports provide best path to root; designated ports are the forwarding ports per segment; alternate ports back up root ports; backup ports back up designated ports; blocking ports prevent loops; disabled ports are shut down.
Last reviewed: Jun 6, 2026
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