When troubleshooting the issue, you notice the election of a new root bridge with an unknown MAC address. Knowing that all access ports have the PortFast feature enabled, what would be the easiest…

The correct answer is A. Enable bpduguard globally. Loopguard, spanning tree, and UDLD are obvious red herrings. This leaves enabling rootguard or bpduguard. One key is that enabling bpduguard only affects ports that have portfast enabled; see the following URL under "Configuration."

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Question

When troubleshooting the issue, you notice the election of a new root bridge with an unknown MAC address. Knowing that all access ports have the PortFast feature enabled, what would be the easiest way to resolve the issue without losing redundant links?

Options

AEnable bpduguard globally.
BEnable rootguard.
CEnable loopguard.
DEnable spanning tree.
EEnable UDLD.

How the community answered

(52 responses)

A
83% (43)
B
2% (1)
C
2% (1)
D
8% (4)
E
6% (3)

Explanation

Loopguard, spanning tree, and UDLD are obvious red herrings. This leaves enabling rootguard or bpduguard. One key is that enabling bpduguard only affects ports that have portfast enabled; see the following URL under "Configuration."

Topics

#BPDUguard#root bridge#PortFast#STP security

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