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Exam 300-115 topic 4 question 204 discussion

Actual exam question from Cisco's 300-115
Question #: 204
Topic #: 4
[All 300-115 Questions]

In which two ways are IEEE STP BPDUs forwarded if VLAN 99 is configured as native? (Choose two)

  • A. VLAN 1 STP BPDUs are sent tagged on VLAN 1
  • B. VLAN 1 STP BPDUs are sent tagged on VLAN 99
  • C. VLAN 1 and VLAN 99 BPDUs are sent tagged on VLAN 1
  • D. VLAN 1 STP BPDUs are sent untagged on VLAN 1
  • E. VLAN 1 STP BPDUs are sent untagged on VLAN 99
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Suggested Answer: AE 🗳️
by diegonamaste at June 26, 2019, 7:18 p.m.

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Bastex
5 years, 7 months ago
"This list shows how PVST+ interoperates with IEEE 802.1Q or IEEE 802.1D, if the Native VLAN on an IEEE 802.1Q trunk is VLAN 1: VLAN 1 STP BPDUs are sent to the IEEE STP MAC address (0180.c200.0000), untagged. VLAN 1 STP BPDUs are also sent to the PVST+ MAC address, untagged. Non-VLAN 1 STP BPDUs are sent to the PVST+ MAC address (also called the Shared Spanning Tree Protocol [SSTP] MAC address, 0100.0ccc.cccd), tagged with a corresponding IEEE 802.1Q VLAN tag. If the Native VLAN on an IEEE 802.1Q trunk is not VLAN 1: VLAN 1 STP BPDUs are sent to the PVST+ MAC address, tagged with a corresponding IEEE 802.1Q VLAN tag. VLAN 1 STP BPDUs are also sent to the IEEE STP MAC address on the Native VLAN of the IEEE 802.1Q trunk, untagged. Non-VLAN 1 STP BPDUs are sent to the PVST+ MAC address, tagged with a corresponding IEEE 802.1Q VLAN tag. Note: Native VLAN STP BPDUs are sent untagged." https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24063-pvid-inconsistency-24063.html#topic1
upvoted 1 times
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diegonamaste
6 years ago
https://community.cisco.com/t5/switching/how-bpdu-is-transmitted-with-native-vlan-for-pvst-and-mstp/td-p/1631995
upvoted 2 times
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