Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
What does an access port do on a switch?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Carries multiple VLANs using 802.1Q tags
That describes a trunk port.
B
Best answer
Connects to a single VLAN for endpoint traffic
Correct. Access ports are typically used for end hosts.
C
Distractor review
Disables spanning tree on the interface
Access mode does not disable STP.
D
Distractor review
Forwards only multicast traffic
Access ports forward normal endpoint traffic, not just multicast.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is mistaking an access port for a trunk port because both involve VLANs. The trap lies in assuming access ports carry multiple VLANs with 802.1Q tags, which is false; only trunk ports do that. Another pitfall is believing that access ports disable Spanning Tree Protocol, but STP remains active to prevent loops. Additionally, some may incorrectly think access ports forward only multicast traffic, but they forward all traffic types within their VLAN. Recognizing these common misconceptions helps avoid selecting incorrect options that describe trunk behavior or STP settings rather than access port functions.
Technical deep dive
How to think about this question
An access port on a Cisco switch is a Layer 2 interface configured to carry traffic for only one VLAN. Unlike trunk ports, which tag frames with 802.1Q VLAN identifiers to carry multiple VLANs, access ports send and receive frames untagged. This means that any frame entering or leaving an access port is associated with a single VLAN, which the switch uses to segregate traffic and maintain VLAN boundaries. Access ports are typically used to connect end devices such as computers, printers, or IP phones that do not understand VLAN tagging. The decision to configure a port as access mode is based on the device type and network design. When a port is set as an access port, the switch assigns it to a specific VLAN, and all traffic on that port is assumed to belong to that VLAN. This simplifies traffic management and security because the switch enforces VLAN membership at the port level. Access ports do not participate in VLAN tagging protocols, so frames are transmitted without 802.1Q tags, making it transparent to the connected device. This behavior contrasts with trunk ports, which carry multiple VLANs and tag frames accordingly. A common exam trap is confusing access ports with trunk ports or assuming access ports disable Spanning Tree Protocol (STP). Access ports do not carry multiple VLANs and do not tag frames, so option A is incorrect. Also, STP remains active on access ports to prevent Layer 2 loops, so option C is false. Another mistake is thinking access ports forward only multicast traffic, but they forward all Ethernet traffic types within their VLAN. Understanding these distinctions is critical for correctly identifying the function of access ports and avoiding confusion during the CCNA exam and real-world network design.
KKey Concepts to Remember
- An access port on a Cisco switch connects a single endpoint device to one specific VLAN, forwarding untagged frames to that VLAN.
- Access ports do not tag Ethernet frames with VLAN information; they send and receive frames without 802.1Q VLAN tags by default.
- Trunk ports differ from access ports by carrying traffic for multiple VLANs simultaneously using 802.1Q tagging.
- Spanning Tree Protocol (STP) remains active on access ports to prevent Layer 2 loops and is not disabled by access mode configuration.
- Access ports forward all types of Ethernet frames from the connected device, including unicast, multicast, and broadcast traffic, within their assigned VLAN.
- Switches use access ports to segregate traffic at Layer 2 by VLAN membership, ensuring endpoint isolation and proper VLAN segmentation.
- When a device connects to an access port, the switch associates the port with a single VLAN, simplifying VLAN management and security policies.
- Access ports are essential for endpoint connectivity in enterprise networks, supporting devices like PCs, printers, and IP phones within one VLAN.
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
An access port on a Cisco switch connects a single endpoint device to one specific VLAN, forwarding untagged frames to that VLAN.
What is the correct answer to this question?
The correct answer is: Connects to a single VLAN for endpoint traffic — An access port carries traffic for a single VLAN and sends frames untagged by default to end devices.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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