JN0-649: Enterprise Routing and Switching, Professional (JNCIP-ENT)Demo

By Juniper · Question Mode

QuestionQ18

Ethernet Switching and Spanning Tree

Select the Exhibit button.

Based on the exhibit, which two statements are correct?

Question Image

Choose two
  • A BPDUs from the root bridge for VLAN 10 have been received on the ge-0/0/7.0 interface.
  • B DS-1 is the root bridge for VLAN 10.
  • C BPDUs from the root bridge for VLAN 20 have been received on the ge-0/0/7.0 interface.
  • D Default VSTP bridge priority values are configured.
Explanation

A root bridge has all of its active spanning-tree ports in the designated role; therefore, DS-1 is the root bridge for VLAN 10. For VLAN 20, ge-0/0/7.0 is an alternate port and identifies the VLAN 20 root bridge as its designated bridge, which means it receives BPDUs from that bridge. Designated ports forward BPDUs away from the root, whereas alternate ports are standby paths toward the root. The displayed bridge-ID priority component is not the default bridge-priority value.

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