The answer is the `switchport mode access` command. This command directly places a switch port into access mode, explicitly telling the switch that the interface should operate as a single-VLAN user-facing port for an endpoint like a PC or printer, rather than as a trunk or a port relying on Dynamic Trunking Protocol (DTP) negotiation. On the CCNA 200-301 v2 exam, this tests your understanding of basic switchport configuration and the importance of making the port role explicit to prevent accidental trunking or VLAN hopping. A common trap is assuming that assigning a VLAN with `switchport access vlan` alone sets the mode, but that command only specifies the VLAN membership—it does not change the port’s operational mode if it is still in dynamic desirable or trunk state. Remember the memory tip: “mode before VLAN”—first lock the port as access with `switchport mode access`, then assign the VLAN. This clarity is both operationally sound and a direct path to the correct answer on exam day.
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. A key principle to apply: the command 'switchport mode access' explicitly configures a switch interface to operate as an access port, carrying traffic for a single VLAN only.. 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 command places a switch port into access mode directly?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
switchport mode access
A switch port is placed into access mode with the `switchport mode access` command. In plain language, this tells the switch that the interface should behave as a single-VLAN user-facing access port rather than as a trunk or a negotiation-based port. This is the normal choice for an endpoint such as a PC, printer, or IP camera that should belong to one VLAN.
This command matters because it makes the intended role of the interface explicit. That clarity is useful operationally and helps avoid accidental trunking behavior. The correct answer is the command that directly defines the switchport as access rather than assigning a VLAN without setting the role or relying on negotiation.
Key principle: The command 'switchport mode access' explicitly configures a switch interface to operate as an access port, carrying traffic for a single VLAN only.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
switchport mode access
Why this is correct
This is correct because it directly forces the interface into access mode.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
The command 'switchport mode access' explicitly configures a switch interface to operate as an access port, carrying traffic for a single VLAN only.
✗
switchport trunk allowed vlan 10
Why it's wrong here
This is wrong because it modifies a trunk’s allowed VLAN list, not access mode.
When this WOULD be correct
If the question asked about configuring VLANs on a trunk port, specifically how to restrict the allowed VLANs to only VLAN 10, then this option would be correct as it directly addresses that scenario.
✗
switchport mode dynamic desirable
Why it's wrong here
This is wrong because it is a negotiation-related setting, not a direct access-mode command.
When this WOULD be correct
If the question asked which command configures a switch port to dynamically negotiate trunking with another device, then 'switchport mode dynamic desirable' would be the correct answer, as it enables the port to initiate trunking negotiation.
✗
no switchport
Why it's wrong here
This is wrong because it converts the interface to Layer 3 routed-port behavior on supported devices.
When this WOULD be correct
If the exam question asked which command would disable Layer 2 functionality on a switch port and convert it to a Layer 3 routed port, then 'no switchport' would be the correct answer.
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.
✓switchport mode accessCorrect answer▾
Why this is correct
This is correct because it directly forces the interface into access mode.
✗switchport trunk allowed vlan 10Wrong answer — click to see why▾
Why this is wrong here
The command 'switchport trunk allowed vlan 10' is used on a trunk port to specify which VLANs are allowed to traverse the trunk link. It does not change the port mode to access; instead, it assumes the port is already a trunk. Therefore, it is incorrect for placing a switch port into access mode.
★ When this WOULD be the correct answer
If the question asked about configuring VLANs on a trunk port, specifically how to restrict the allowed VLANs to only VLAN 10, then this option would be correct as it directly addresses that scenario.
Why candidates choose this
Students might confuse VLAN configuration with port mode, thinking that specifying an allowed VLAN on a trunk is similar to assigning a VLAN to an access port. The word 'vlan' in the command can mislead them into believing it sets the port to access mode.
✗switchport mode dynamic desirableWrong answer — click to see why▾
Why this is wrong here
The command 'switchport mode dynamic desirable' enables Dynamic Trunking Protocol (DTP) to actively negotiate trunking with the connected device. This does not directly place the port into access mode; instead, it allows the port to become a trunk if the neighbor agrees. The port remains in a dynamic state until negotiation completes.
★ When this WOULD be the correct answer
If the question asked which command configures a switch port to dynamically negotiate trunking with another device, then 'switchport mode dynamic desirable' would be the correct answer, as it enables the port to initiate trunking negotiation.
Why candidates choose this
Test-takers with partial knowledge might think 'dynamic desirable' is a mode that automatically configures the port as access, confusing the dynamic negotiation feature with a static access mode. The word 'desirable' can imply a preferred state, but it is actually a trunk negotiation setting.
✗no switchportWrong answer — click to see why▾
Why this is wrong here
The command 'no switchport' converts a Layer 2 switch port into a Layer 3 routed port, which is used for routing between VLANs or connecting to routers. This removes all Layer 2 switching functionality, including VLAN assignment, and is the opposite of placing the port into access mode.
★ When this WOULD be the correct answer
If the exam question asked which command would disable Layer 2 functionality on a switch port and convert it to a Layer 3 routed port, then 'no switchport' would be the correct answer.
Why candidates choose this
Students might misinterpret 'no switchport' as removing trunking or reverting to a default access state, not realizing it changes the port to a routed interface. The negation of 'switchport' can be confusing, leading them to think it sets the port to a basic switching mode.
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
Be careful not to confuse VLAN assignment or negotiation commands with those that explicitly set port modes.
Trap categories for this question
Command / output trap
This is wrong because it is a negotiation-related setting, not a direct access-mode command.
Detailed technical explanation
How to think about this question
Switch ports on Cisco devices can operate in different modes to handle VLAN traffic appropriately. The core concept behind the 'switchport mode access' command is to configure the interface as an access port, which means it will carry traffic for only one VLAN and will not participate in trunking protocols. Access ports are designed for end devices that do not understand VLAN tagging, ensuring that frames are sent and received untagged except for the implicit VLAN membership assigned to the port.
When configuring a switch port, the decision to use 'switchport mode access' explicitly sets the port to access mode, overriding any dynamic negotiation protocols such as DTP. This command is crucial because it prevents the port from becoming a trunk, which could carry multiple VLANs and cause unintended network behavior. The switchport mode access command is the definitive way to ensure the port behaves as a single-VLAN access point, which is the standard for most user-facing interfaces.
A common exam trap involves confusing 'switchport mode access' with dynamic negotiation commands like 'switchport mode dynamic desirable' or commands that modify VLAN membership without setting the port mode, such as 'switchport trunk allowed vlan'. Additionally, the 'no switchport' command converts the interface to a routed port, which is unrelated to access mode configuration. Understanding these distinctions helps avoid misconfiguration that can lead to VLAN leakage, security risks, or loss of connectivity for endpoint devices.
KKey Concepts to Remember
The command 'switchport mode access' explicitly configures a switch interface to operate as an access port, carrying traffic for a single VLAN only.
Switch ports in access mode do not negotiate trunking and do not carry multiple VLANs, which prevents unintended VLAN tagging or trunk formation.
The 'switchport mode dynamic desirable' command enables Dynamic Trunking Protocol (DTP) negotiation, which can result in the port becoming a trunk if the other side agrees.
Using 'no switchport' converts a Layer 2 switch port into a Layer 3 routed port, disabling VLAN tagging and switching capabilities on that interface.
The 'switchport trunk allowed vlan' command controls which VLANs are permitted on a trunk port but does not affect the port’s mode or access status.
Access ports are typically used for endpoint devices like PCs, printers, or IP cameras that require membership in a single VLAN for network segmentation.
Explicitly setting a port to access mode avoids accidental trunking, which can cause VLAN leakage and security or connectivity issues in a switched network.
Cisco switches use the 'switchport mode' command family to define port behavior, and choosing the correct mode is essential for proper VLAN and traffic management.
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
The command 'switchport mode access' explicitly configures a switch interface to operate as an access port, carrying traffic for a single VLAN only.
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.
Review the command 'switchport mode access' explicitly configures a switch interface to operate as an access port, carrying traffic for a single VLAN only., then practise related 200-301 questions on the same topic to reinforce the concept.
Switching and Network Access — This question tests Switching and Network Access — The command 'switchport mode access' explicitly configures a switch interface to operate as an access port, carrying traffic for a single VLAN only..
What is the correct answer to this question?
The correct answer is: switchport mode access — A switch port is placed into access mode with the `switchport mode access` command. In plain language, this tells the switch that the interface should behave as a single-VLAN user-facing access port rather than as a trunk or a negotiation-based port. This is the normal choice for an endpoint such as a PC, printer, or IP camera that should belong to one VLAN.
This command matters because it makes the intended role of the interface explicit. That clarity is useful operationally and helps avoid accidental trunking behavior. The correct answer is the command that directly defines the switchport as access rather than assigning a VLAN without setting the role or relying on negotiation.
What should I do if I get this 200-301 question wrong?
Review the command 'switchport mode access' explicitly configures a switch interface to operate as an access port, carrying traffic for a single VLAN only., 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: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
The command 'switchport mode access' explicitly configures a switch interface to operate as an access port, carrying traffic for a single VLAN only.
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