A network engineer must prevent loops from occurring on a Cisco Nexus 9300 Series Switch when new switches are connected. The interface Ethernet1/2 must be used for host connectivity. Which…

The correct answer is C. spanning-tree bpduguard enable. BPDU Guard (spanning-tree bpduguard enable) is the correct protection for host-facing ports. When enabled on an interface, if a BPDU (Bridge Protocol Data Unit) is received - which would indicate a switch or bridge has been connected - the port is immediately placed into an…

Network

Question

A network engineer must prevent loops from occurring on a Cisco Nexus 9300 Series Switch when new switches are connected. The interface Ethernet1/2 must be used for host connectivity. Which configuration must be applied to Ethernet1/2?

Options

Aspanning-tree guard loop
Bspanning-tree loopguard default
Cspanning-tree bpduguard enable
Dspanning-tree bpdufilter enable

How the community answered

(53 responses)

A
13% (7)
B
8% (4)
C
75% (40)
D
4% (2)

Explanation

BPDU Guard (spanning-tree bpduguard enable) is the correct protection for host-facing ports. When enabled on an interface, if a BPDU (Bridge Protocol Data Unit) is received - which would indicate a switch or bridge has been connected - the port is immediately placed into an err-disabled state, preventing any potential bridging loops. This is appropriate for host-only ports where switch connections are not expected or allowed. BPDU Filter suppresses BPDUs but doesn't disable the port, which is less safe. Loop Guard protects against unidirectional link failures, not rogue switch connections.

Topics

#Spanning Tree Protocol#BPDU Guard#Network Loop Prevention#Cisco Nexus

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