Question 1mediummatching
Full question →Match each trunk or VLAN term to its most accurate function.
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mediummatchingObjective-mapped
Match each trunk or VLAN term to its most accurate function.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is confusing the native VLAN with the access VLAN. The native VLAN applies only to untagged traffic on a trunk port, whereas the access VLAN is assigned to endpoint-facing ports and carries untagged traffic for a single VLAN. Mistaking the native VLAN as the access VLAN can lead to incorrect answers about VLAN tagging and trunk behavior. Another trap is ignoring the allowed VLAN list, which controls which VLANs can traverse a trunk. Overlooking this can cause VLAN traffic to be blocked unexpectedly, leading to troubleshooting errors.
Technical deep dive
How to think about this question
VLANs (Virtual Local Area Networks) segment a physical network into multiple logical broadcast domains, improving security and reducing broadcast traffic. A trunk port is a switch interface configured to carry traffic for multiple VLANs by tagging each frame with a VLAN ID using the IEEE 802.1Q standard. This tagging allows switches to identify which VLAN each frame belongs to as it traverses the trunk link. In contrast, an access port connects to end devices and carries traffic for only one VLAN without tagging frames. The native VLAN is a special VLAN assigned to a trunk port to handle untagged frames. By default, VLAN 1 is the native VLAN on Cisco switches, but it can be changed for security reasons. Untagged frames arriving on a trunk port are assumed to belong to the native VLAN. The allowed VLAN list on a trunk port defines which VLANs are permitted to send traffic across the trunk link, preventing unauthorized VLAN traffic from traversing the link and reducing unnecessary broadcast traffic. A common exam trap involves confusing the native VLAN with the access VLAN or misunderstanding the role of the allowed VLAN list. For example, untagged traffic on a trunk port is associated with the native VLAN, not the access VLAN. Additionally, if the allowed VLAN list is misconfigured, legitimate VLAN traffic may be blocked, causing connectivity issues. Understanding these distinctions is critical for troubleshooting VLAN and trunking problems in Cisco networks and for passing the CCNA exam.
KKey Concepts to Remember
- A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using the 802.1Q protocol.
- An access VLAN is assigned to an endpoint-facing switch port and carries untagged traffic belonging to a single VLAN.
- The native VLAN on a trunk port handles untagged frames and is used to maintain backward compatibility with devices that do not tag VLANs.
- The allowed VLAN list on a trunk port restricts which VLANs are permitted to traverse the trunk link, enhancing security and traffic control.
- Switches use VLAN tagging to segregate broadcast domains, and trunks enable VLAN information to be preserved across multiple switches.
- Misconfiguring the native VLAN or allowed VLAN list can cause VLAN mismatches, leading to traffic loss or security vulnerabilities.
- Access ports do not tag frames, so all traffic on an access port is assumed to belong to the configured access VLAN.
- Trunk ports must be configured consistently on both ends to ensure proper VLAN tagging and traffic forwarding across the network.
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?
A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with VLAN identifiers using the 802.1Q protocol.
What exam trap should I watch out for?
Common exam trap: answer the scenario, not the keyword: A frequent exam trap is confusing the native VLAN with the access VLAN. The native VLAN applies only to untagged traffic on a trunk port, whereas the access VLAN is assigned to endpoint-facing ports and carries untagged traffic for a single VLAN. Mistaking the native VLAN as the access VLAN can lead to incorrect answers about VLAN tagging and trunk behavior. Another trap is ignoring the allowed VLAN list, which controls which VLANs can traverse a trunk. Overlooking this can cause VLAN traffic to be blocked unexpectedly, leading to troubleshooting errors.
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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