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. A key principle to apply: spanning Tree Protocol prevents Layer 2 switching loops by selectively blocking redundant paths in a switched network.. 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.
What problem does Spanning Tree Protocol solve in a switched network?
IP address exhaustion
Why wrong: STP does not address IP address planning.
Layer 2 switching loops
Correct. Loop prevention is the core purpose of STP.
Slow DNS lookups
Why wrong: DNS performance is unrelated to STP.
Weak wireless encryption
Why wrong: Wireless encryption is unrelated to STP.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Layer 2 switching loops
STP prevents Layer 2 loops by blocking redundant paths when necessary, which avoids broadcast storms and MAC table instability.
Key principle: Spanning Tree Protocol prevents Layer 2 switching loops by selectively blocking redundant paths in a switched network.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
IP address exhaustion
Why it's wrong here
STP does not address IP address planning.
When this WOULD be correct
In a question asking about the challenges of IPv4 addressing in a large network or the implications of subnetting, option A could be correct if it discusses the depletion of available IP addresses due to insufficient subnetting or address planning.
Layer 2 switching loops
Why this is correct
Correct. Loop prevention is the core purpose of STP.
Related concept
Spanning Tree Protocol prevents Layer 2 switching loops by selectively blocking redundant paths in a switched network.
Slow DNS lookups
When this WOULD be correct
In a different exam question asking about network performance issues, if the question specifically relates to factors affecting application response times, such as slow DNS resolution due to misconfigured DNS servers, option C could be correct. For example, a question might ask about the causes of slow website loading times, where DNS lookups are a factor.
Weak wireless encryption
Why it's wrong here
Wireless encryption is unrelated to STP.
Option-by-option analysis
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.
Why this is correct
Correct. Loop prevention is the core purpose of STP.
Why this is wrong here
Spanning Tree Protocol (STP) operates at Layer 2 and has no mechanism to manage or allocate IP addresses; IP address exhaustion is addressed by protocols like DHCP or IPv6 transition technologies.
★ When this WOULD be the correct answer
In a question asking about the challenges of IPv4 addressing in a large network or the implications of subnetting, option A could be correct if it discusses the depletion of available IP addresses due to insufficient subnetting or address planning.
Why candidates choose this
Students might confuse STP with routing protocols or think that any network protocol can help with IP address management, but STP is strictly for loop prevention.
Why this is wrong here
DNS lookups are application-layer processes that rely on IP connectivity and name resolution servers; STP does not influence DNS performance or resolution speed.
★ When this WOULD be the correct answer
In a different exam question asking about network performance issues, if the question specifically relates to factors affecting application response times, such as slow DNS resolution due to misconfigured DNS servers, option C could be correct. For example, a question might ask about the causes of slow website loading times, where DNS lookups are a factor.
Why candidates choose this
A test-taker might think that network loops cause slow DNS due to broadcast storms, but STP's primary role is loop prevention, not DNS optimization.
Why this is wrong here
Wireless encryption is a security feature implemented at the data link layer (e.g., WPA2/3) and is unrelated to STP, which deals with physical topology loop prevention.
★ When this WOULD be the correct answer
If the exam question asked about security protocols in wireless networks, specifically regarding encryption methods like WPA2 or WPA3, then 'weak wireless encryption' could be the correct answer in the context of discussing vulnerabilities in wireless security.
Why candidates choose this
Students may associate 'spanning tree' with wireless mesh networks or confuse STP with security protocols, but STP is specifically for wired Ethernet switches.
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
Avoid confusing STP with technologies like EtherChannel, IPsec, or QoS, which address different network concerns.
Detailed technical explanation
The Spanning Tree Protocol (STP) is a Layer 2 network protocol designed to prevent switching loops in Ethernet networks. Switching loops occur when there are multiple active paths between switches, causing broadcast frames to circulate endlessly, which leads to broadcast storms and MAC address table instability. STP dynamically identifies redundant links and selectively blocks some of these links to create a loop-free logical topology while maintaining physical redundancy for fault tolerance. STP operates by electing a root bridge and calculating the shortest path to the root for each switch port. It assigns port roles such as root port, designated port, and blocked port based on path cost metrics. Ports that could cause loops are placed into a blocking state, preventing frame forwarding on those links. This process ensures that only one active path exists between any two network devices at Layer 2, eliminating loops without manual intervention. A common exam trap is confusing STP’s purpose with Layer 3 issues like IP address management or DNS performance. STP strictly addresses Layer 2 switching loops and does not affect IP routing or wireless security. In practical Cisco networks, STP is essential for maintaining stable Layer 2 topologies, especially in environments with redundant links. Understanding STP’s role helps avoid misconfigurations that could cause network outages or broadcast storms.
Key takeaway
Spanning Tree Protocol prevents Layer 2 switching loops by selectively blocking redundant paths in a switched network.
Real-world example
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
Review spanning Tree Protocol prevents Layer 2 switching loops by selectively blocking redundant paths in a switched network., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Switching and Network Access — This question tests Switching and Network Access — Spanning Tree Protocol prevents Layer 2 switching loops by selectively blocking redundant paths in a switched network..
The correct answer is: Layer 2 switching loops — STP prevents Layer 2 loops by blocking redundant paths when necessary, which avoids broadcast storms and MAC table instability.
Review spanning Tree Protocol prevents Layer 2 switching loops by selectively blocking redundant paths in a switched network., then practise related 200-301 questions on the same topic to reinforce the concept.
Spanning Tree Protocol prevents Layer 2 switching loops by selectively blocking redundant paths in a switched network.
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Last reviewed: May 17, 2026
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