The answer is E, Power over Ethernet (PoE), but only if you misread the question—the correct match for the concepts listed is actually a one-to-one mapping where SSID matches A, CAPWAP matches B, Voice VLAN matches C, and PortFast matches D. SSID is the human-readable network name broadcast by access points so clients can identify the wireless LAN, while CAPWAP defines the control and provisioning communication between lightweight APs and a wireless LAN controller. Voice VLAN separates phone traffic from ordinary data on an edge port, and PortFast allows an endpoint-facing switchport to bypass spanning-tree listening and learning states, moving immediately to forwarding. On the CCNA 200-301 v2 exam, this question tests your ability to distinguish wireless and edge-switch fundamentals from common distractors like PoE, 802.1X, and EtherChannel. A common trap is confusing Voice VLAN with PoE because both involve phones, but remember: Voice VLAN is about traffic separation, not power delivery. For a quick memory tip, think “SSID = Name, CAPWAP = Tunnel, Voice VLAN = Phone Lane, PortFast = Fast Lane.”
CCNA SSID identifies wireless networks in WLANs 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. A key principle to apply: sSID identifies wireless networks in WLANs. 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.
Match each wireless or edge-switch concept on the left to the description on the right that best fits it. Not all descriptions will be used.
Concepts:
• SSID
• CAPWAP
• Voice VLAN
• PortFast
Descriptions:
A. Name of the wireless LAN shown to clients
B. Communication relationship between lightweight APs and controller
C. Separates phone traffic from ordinary data on an edge port
D. Allows an endpoint-facing switchport to move quickly toward forwarding
E. Delivers power to devices over Ethernet (PoE)
F. Authenticates users before granting network access (802.1X)
G. Aggregates multiple physical links for increased bandwidth (LACP/EtherChannel)
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
PoE (Power over Ethernet)
SSID is the service set identifier, the human-readable name broadcast by access points so clients can identify the WLAN. CAPWAP (Control and Provisioning of Wireless Access Points) defines the split-MAC architecture and communication between lightweight APs and a wireless LAN controller. Voice VLAN is an access port feature that dynamically assigns IP phone traffic to a separate VLAN, isolating it from data traffic. PortFast is a spanning-tree enhancement that bypasses listening and learning states on access ports to allow immediate forwarding, preventing connectivity delays for endpoints. Distractor E refers to Power over Ethernet, not a wireless or edge-switch naming concept; F describes 802.1X authentication, not a WLAN name or AP-controller protocol; G refers to link aggregation, not a VLAN or spanning-tree feature.
Key principle: SSID identifies wireless networks in WLANs
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
PoE (Power over Ethernet)
Why this is correct
PoE delivers power over Ethernet cables to devices such as IP phones and wireless access points, eliminating the need for separate power sources.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
SSID identifies wireless networks in WLANs
✗
RSTP (Rapid Spanning Tree Protocol)
Why it's wrong here
RSTP improves STP convergence but does not deliver power; it is a loop-prevention protocol for Ethernet networks.
✗
802.1X (Port-Based Network Access Control)
Why it's wrong here
802.1X controls network access by authenticating devices before granting access, but it does not deliver power.
✗
VLAN Trunking (802.1Q)
Why it's wrong here
VLAN trunking allows multiple VLANs to traverse a single link, but it does not deliver power.
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.
✓PoE (Power over Ethernet)Correct answer▾
Why this is correct
PoE delivers power over Ethernet cables to devices such as IP phones and wireless access points, eliminating the need for separate power sources.
✗RSTP (Rapid Spanning Tree Protocol)Wrong answer — click to see why▾
Why this is wrong here
RSTP is a Layer 2 protocol that provides faster convergence than STP, but it has nothing to do with power delivery.
Why candidates choose this
Candidates might confuse 'power' with 'performance' or think RSTP provides some form of 'power' due to its name.
✗802.1X (Port-Based Network Access Control)Wrong answer — click to see why▾
Why this is wrong here
802.1X is a security protocol for authentication, not a power delivery mechanism.
Why candidates choose this
Candidates might associate 802.1X with 'power' because it is often used in conjunction with PoE switches for access control.
✗VLAN Trunking (802.1Q)Wrong answer — click to see why▾
Why this is wrong here
VLAN trunking is a method for carrying multiple VLANs over a trunk link, unrelated to power delivery.
Why candidates choose this
Candidates might think 'trunking' involves some form of power aggregation or delivery.
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
Do not confuse Voice VLAN with a trunk port that carries multiple VLANs — Voice VLAN actually uses the access port in conjunction with a voice VLAN ID, and PortFast is often mistaken for disabling spanning tree entirely rather than accelerating convergence.
Detailed technical explanation
How to think about this question
SSID (Service Set Identifier) is the wireless network name broadcast by an access point, allowing clients to identify and connect to the WLAN. CAPWAP (Control And Provisioning of Wireless Access Points) is a protocol that enables centralized management of multiple APs by a wireless LAN controller, facilitating configuration and control. Voice VLAN is a feature on Cisco switches that segregates voice traffic from data on an access port, ensuring Quality of Service (QoS) by prioritizing voice packets, which is critical for IP telephony. PortFast is a Spanning Tree Protocol (STP) enhancement applied to switch ports connected to end devices; it immediately transitions the port to the forwarding state, bypassing the usual listening and learning states, thus reducing network convergence time and improving endpoint connectivity. Each concept addresses a specific operational challenge in wireless or edge-switch environments, making them essential for efficient network access design and troubleshooting.
KKey Concepts to Remember
SSID identifies wireless networks in WLANs
CAPWAP manages AP-controller communication
Voice VLAN prioritizes voice traffic on edge ports
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
SSID identifies wireless networks in WLANs
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Switching and Network Access — This question tests Switching and Network Access — SSID identifies wireless networks in WLANs.
What is the correct answer to this question?
The correct answer is: PoE (Power over Ethernet) — SSID is the service set identifier, the human-readable name broadcast by access points so clients can identify the WLAN. CAPWAP (Control and Provisioning of Wireless Access Points) defines the split-MAC architecture and communication between lightweight APs and a wireless LAN controller. Voice VLAN is an access port feature that dynamically assigns IP phone traffic to a separate VLAN, isolating it from data traffic. PortFast is a spanning-tree enhancement that bypasses listening and learning states on access ports to allow immediate forwarding, preventing connectivity delays for endpoints. Distractor E refers to Power over Ethernet, not a wireless or edge-switch naming concept; F describes 802.1X authentication, not a WLAN name or AP-controller protocol; G refers to link aggregation, not a VLAN or spanning-tree feature.
What should I do if I get this 200-301 question wrong?
Review sSID identifies wireless networks in WLANs, 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?
SSID identifies wireless networks in WLANs
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