- A
PortFast and BPDU Guard
Correct. This is correct. PortFast provides fast host connectivity, and BPDU Guard protects the port by shutting it down if BPDUs are received from a connected switch.
- B
DHCP snooping and DAI
Why wrong: DHCP snooping and Dynamic ARP Inspection are useful security features, but they solve different problems. They help protect address assignment and ARP behavior, not the specific combination of fast access-port startup and protection against a rogue or accidental switch connection.
- C
Root Guard and VTP pruning
Why wrong: Root Guard can help in spanning-tree design, but it is not the standard feature used to give quick edge-port startup. VTP pruning is unrelated to the core requirement. The question is specifically describing the common edge-port hardening pair, which is PortFast with BPDU Guard.
- D
Port security and CDP
Why wrong: Port security controls allowed MAC addresses, and CDP provides device information. Neither pair directly matches the two-part requirement as completely as PortFast and BPDU Guard do.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: portFast enables immediate forwarding on access ports by bypassing STP listening and learning states to speed up host connectivity.. 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.
An engineer wants users to get fast link-up on access ports but also wants the switch to disable a port if another switch is connected and sends BPDUs.
Which combination of features best meets that requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
PortFast and BPDU Guard
PortFast and BPDU Guard are the classic edge-port combination for this requirement. PortFast helps a user-facing interface begin forwarding quickly so a PC or phone does not wait through the normal spanning-tree transition delay. BPDU Guard adds protection by monitoring that same port for BPDUs. If a switch is accidentally or intentionally connected and starts participating in spanning tree, BPDU Guard reacts by disabling the port to protect the Layer 2 topology. In plain language, users get quick connectivity when the port is used correctly, but the network still protects itself against someone plugging in a switch where only an endpoint should exist. That is exactly what the requirement asks for.
Key principle: PortFast enables immediate forwarding on access ports by bypassing STP listening and learning states to speed up host connectivity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
PortFast and BPDU Guard
Why this is correct
Correct. This is correct. PortFast provides fast host connectivity, and BPDU Guard protects the port by shutting it down if BPDUs are received from a connected switch.
Clue confirmation
The clue word "best" in the question point toward this answer.
- ✗
DHCP snooping and DAI
Why it's wrong here
DHCP snooping and Dynamic ARP Inspection are useful security features, but they solve different problems. They help protect address assignment and ARP behavior, not the specific combination of fast access-port startup and protection against a rogue or accidental switch connection.
When this WOULD be correct
If the exam question asked for features to enhance network security and prevent unauthorized DHCP servers while ensuring valid DHCP traffic, then DHCP snooping and DAI would be the correct answer, as they work together to secure the DHCP infrastructure.
- ✗
Root Guard and VTP pruning
Why it's wrong here
Root Guard can help in spanning-tree design, but it is not the standard feature used to give quick edge-port startup. VTP pruning is unrelated to the core requirement. The question is specifically describing the common edge-port hardening pair, which is PortFast with BPDU Guard.
When this WOULD be correct
If the exam question focused on maintaining the stability of the spanning tree topology in a multi-switch environment while allowing for efficient VLAN management, then Root Guard could be the correct answer. For instance, a scenario where the goal is to prevent a switch from becoming the root bridge would make this option valid.
- ✗
Port security and CDP
Why it's wrong here
Port security controls allowed MAC addresses, and CDP provides device information. Neither pair directly matches the two-part requirement as completely as PortFast and BPDU Guard do.
When this WOULD be correct
If the exam question asked for a method to secure access ports against unauthorized devices while also enabling monitoring of connected devices, then Port security and CDP could be the correct answer. This would focus on ensuring only known devices connect while utilizing CDP for network topology information.
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.
✓PortFast and BPDU GuardCorrect answer▾
Why this is correct
Correct. This is correct. PortFast provides fast host connectivity, and BPDU Guard protects the port by shutting it down if BPDUs are received from a connected switch.
✗DHCP snooping and DAIWrong answer — click to see why▾
Why this is wrong here
DHCP snooping and DAI (Dynamic ARP Inspection) do not address the requirement of disabling a port upon receiving BPDUs; they focus on protecting against rogue DHCP servers and ARP spoofing, respectively.
★ When this WOULD be the correct answer
If the exam question asked for features to enhance network security and prevent unauthorized DHCP servers while ensuring valid DHCP traffic, then DHCP snooping and DAI would be the correct answer, as they work together to secure the DHCP infrastructure.
Why candidates choose this
Candidates may find this option tempting because both DHCP snooping and DAI are well-known security features in networking, leading them to mistakenly associate them with port protection and network integrity.
✗Root Guard and VTP pruningWrong answer — click to see why▾
Why this is wrong here
Root Guard and VTP pruning do not address the requirement of quickly enabling access ports and disabling them upon receiving BPDUs. Root Guard is used to prevent a port from becoming a root port, while VTP pruning optimizes VLAN traffic, neither of which directly manage port states based on BPDU reception.
★ When this WOULD be the correct answer
If the exam question focused on maintaining the stability of the spanning tree topology in a multi-switch environment while allowing for efficient VLAN management, then Root Guard could be the correct answer. For instance, a scenario where the goal is to prevent a switch from becoming the root bridge would make this option valid.
Why candidates choose this
Candidates may choose this option because they recognize the importance of spanning tree protocols and may mistakenly believe that Root Guard's function of managing root bridge elections aligns with the need to control port states in response to BPDUs.
✗Port security and CDPWrong answer — click to see why▾
Why this is wrong here
Port security and CDP do not provide the necessary functionality to disable a port when BPDUs are received. Port security can limit the number of MAC addresses but does not specifically address BPDU handling.
★ When this WOULD be the correct answer
If the exam question asked for a method to secure access ports against unauthorized devices while also enabling monitoring of connected devices, then Port security and CDP could be the correct answer. This would focus on ensuring only known devices connect while utilizing CDP for network topology information.
Why candidates choose this
Candidates may choose this option because they recognize that Port security is a common feature for securing switch ports, and they might mistakenly believe that CDP's monitoring capabilities align with the requirements of the question.
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: answer the scenario, not the keyword
Avoid confusing BPDU Guard with other guard features like Root Guard or Loop Guard, which serve different purposes.
Detailed technical explanation
How to think about this question
PortFast is a Cisco Catalyst switch feature that allows access ports to bypass the usual Spanning Tree Protocol (STP) listening and learning states, enabling immediate transition to the forwarding state. This is critical for endpoints like PCs or IP phones that require fast network connectivity without waiting for STP convergence, which normally takes 30 to 50 seconds. PortFast is only intended for ports connected directly to end devices, not other switches, to prevent Layer 2 loops. BPDU Guard complements PortFast by monitoring access ports for Bridge Protocol Data Units (BPDUs). If a BPDU is received on a PortFast-enabled port, BPDU Guard immediately disables the port (puts it into err-disable state) to protect the network topology from potential loops caused by unauthorized or accidental switch connections. This combination ensures fast link-up for legitimate hosts while securing the network against rogue switches. A common exam trap is confusing PortFast and BPDU Guard with other security features like Root Guard or DHCP snooping. PortFast alone speeds up connectivity but does not protect against rogue switches. BPDU Guard specifically disables ports receiving BPDUs on PortFast ports, which is the exact behavior required. Understanding this distinction is crucial for correctly answering questions about fast link-up and Layer 2 security in CCNA exams.
KKey Concepts to Remember
- PortFast enables immediate forwarding on access ports by bypassing STP listening and learning states to speed up host connectivity.
- BPDU Guard disables a PortFast-enabled port if it receives BPDUs, preventing rogue switches from causing Layer 2 loops.
- STP normally imposes a delay on port forwarding to prevent loops, but PortFast safely bypasses this delay on edge ports.
- BPDU Guard protects the network topology by err-disabling ports that receive unexpected BPDUs on PortFast ports.
- PortFast should only be enabled on ports connected to end devices, never on ports connecting to other switches.
- Root Guard protects the root bridge election process but does not provide fast link-up or port shutdown on BPDU reception.
- DHCP snooping and Dynamic ARP Inspection protect IP address assignment and ARP spoofing but do not affect STP port states.
- Port security limits MAC addresses on a port but does not speed up STP convergence or disable ports on BPDU reception.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
PortFast enables immediate forwarding on access ports by bypassing STP listening and learning states to speed up host connectivity.
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 portFast enables immediate forwarding on access ports by bypassing STP listening and learning states to speed up host connectivity., then practise related 200-301 questions on the same topic to reinforce the concept.
- →
Network Services and Security — study guide chapter
Learn the concepts, then practise the questions
- →
Network Services and Security practice questions
Targeted practice on this topic area only
- →
All 200-301 questions
1,819 questions across all exam domains
- →
CCNA 200-301 v2 study guide
Full concept coverage aligned to exam objectives
- →
200-301 practice test guide
How to use practice tests most effectively before exam day
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.
Network Infrastructure and Connectivity practice questions
Practise 200-301 questions linked to Network Infrastructure and Connectivity.
Switching and Network Access practice questions
Practise 200-301 questions linked to Switching and Network Access.
IP Routing practice questions
Practise 200-301 questions linked to IP Routing.
Network Services and Security practice questions
Practise 200-301 questions linked to Network Services and Security.
AI and Network Operations practice questions
Practise 200-301 questions linked to AI and Network Operations.
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.
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?
Network Services and Security — This question tests Network Services and Security — PortFast enables immediate forwarding on access ports by bypassing STP listening and learning states to speed up host connectivity..
What is the correct answer to this question?
The correct answer is: PortFast and BPDU Guard — PortFast and BPDU Guard are the classic edge-port combination for this requirement. PortFast helps a user-facing interface begin forwarding quickly so a PC or phone does not wait through the normal spanning-tree transition delay. BPDU Guard adds protection by monitoring that same port for BPDUs. If a switch is accidentally or intentionally connected and starts participating in spanning tree, BPDU Guard reacts by disabling the port to protect the Layer 2 topology. In plain language, users get quick connectivity when the port is used correctly, but the network still protects itself against someone plugging in a switch where only an endpoint should exist. That is exactly what the requirement asks for.
What should I do if I get this 200-301 question wrong?
Review portFast enables immediate forwarding on access ports by bypassing STP listening and learning states to speed up host connectivity., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
PortFast enables immediate forwarding on access ports by bypassing STP listening and learning states to speed up host connectivity.
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 switchport connected to another switch should carry multiple VLANs, but it was manually configured as an access port.…
- What problem is HSRP designed to solve?
- Which TWO statements correctly describe the causes or implications of CRC errors, runts, giants, or output errors as see…
- You are connected to R1. Configure IPv4 and IPv6 addressing on R1's interfaces and verify reachability to R2. The curren…
- Which TWO statements accurately describe how AI/ML concepts are applied to network operations in modern enterprise netwo…
- Which TWO switch port configurations are required when connecting a Cisco IP phone and a desktop PC to a single access p…
Last reviewed: May 17, 2026
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.
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.
Sign in to join the discussion.