Question 1mediummatching
Full question →Match each switchport or trunking concept to its most accurate role.
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mediummatchingObjective-mapped
Match each switchport or trunking concept to its most accurate role.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is confusing the native VLAN with the allowed VLAN list or access port roles. Candidates might assume the native VLAN carries all VLANs untagged, but it only handles untagged frames for one VLAN. Misconfiguring the native VLAN or mixing access and trunk port settings can cause VLAN leakage or traffic loss. Another trap is forgetting that the allowed VLAN list restricts VLANs on a trunk, so if a VLAN is not allowed, its traffic won’t pass, causing connectivity issues. Recognizing these distinctions is crucial to avoid misinterpretation of VLAN trunking behavior in the exam.
Technical deep dive
How to think about this question
Switchports in Cisco networking operate primarily in two modes: access and trunk. An access port connects end devices like PCs or printers to a single VLAN, sending and receiving untagged Ethernet frames. This simplifies device VLAN membership and isolates traffic within that VLAN. In contrast, a trunk port is configured between switches or network devices to carry traffic for multiple VLANs simultaneously. It tags frames with VLAN identifiers using IEEE 802.1Q encapsulation, allowing VLAN segregation across a shared physical link. The allowed VLAN list on a trunk port controls which VLANs are permitted to send traffic across that trunk. By default, all VLANs are allowed, but administrators can restrict this list to improve security and reduce unnecessary broadcast traffic. The native VLAN is a special VLAN on a trunk that carries untagged frames. Frames belonging to the native VLAN are sent without 802.1Q tags, which is critical for compatibility with devices that do not support tagging or for protocols that rely on untagged frames. A common exam trap involves confusing the native VLAN with the allowed VLAN list or the access port function. Misconfiguring the native VLAN can cause VLAN hopping or traffic leakage between VLANs. Additionally, mixing access and trunk port configurations on the same interface or misunderstanding which VLANs are allowed on a trunk can lead to connectivity issues. Understanding these roles helps troubleshoot VLAN-related problems and ensures proper VLAN segmentation in Cisco networks.
KKey Concepts to Remember
- An access port connects a single endpoint device to one VLAN and forwards untagged frames belonging to that VLAN.
- A trunk port carries traffic for multiple VLANs simultaneously by tagging frames with 802.1Q VLAN identifiers.
- The allowed VLAN list on a trunk port restricts which VLANs are permitted to send traffic across that trunk link.
- The native VLAN on a trunk port carries untagged frames and is associated with one specific VLAN for compatibility.
- Frames belonging to the native VLAN are sent without VLAN tags, which prevents tagging issues with legacy devices.
- Misconfiguring the native VLAN or allowed VLAN list can cause VLAN leakage or loss of connectivity between switches.
- Access ports do not tag frames, while trunk ports tag frames except for the native VLAN traffic.
- Proper VLAN trunking configuration is essential for maintaining VLAN segmentation and preventing broadcast domain overlap.
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 connects a single endpoint device to one VLAN and forwards untagged frames belonging to that VLAN.
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 allowed VLAN list or access port roles. Candidates might assume the native VLAN carries all VLANs untagged, but it only handles untagged frames for one VLAN. Misconfiguring the native VLAN or mixing access and trunk port settings can cause VLAN leakage or traffic loss. Another trap is forgetting that the allowed VLAN list restricts VLANs on a trunk, so if a VLAN is not allowed, its traffic won’t pass, causing connectivity issues. Recognizing these distinctions is crucial to avoid misinterpretation of VLAN trunking behavior in the exam.
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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