Cisco ENCOR Lan Switches 5

Question 1

Which Cisco switching feature allows multiple VLANs to share a single Spanning Tree instance to reduce CPU and memory overhead?

Accepted Answer

Multiple Spanning Tree (MST / 802.1s)

Answer

MST (802.1s) maps multiple VLANs to a smaller number of STP instances, reducing the per-VLAN processing overhead found in Rapid PVST+.

Question 2

A switch port configured as a trunk receives an untagged frame. What VLAN does the switch assign that frame to?

Accepted Answer

The native VLAN configured on that trunk port

Answer

Untagged frames arriving on an 802.1Q trunk port are placed in the native VLAN configured on that interface.

Question 3

Which command enables Root Guard on a switch port to prevent it from becoming the root port?

Accepted Answer

spanning-tree guard root

Answer

Root Guard is enabled per-interface with 'spanning-tree guard root' and places the port in a root-inconsistent state if a superior BPDU is received.

Question 4

In a switch stack using Cisco StackWise technology, what happens if the active stack master fails?

Accepted Answer

The standby switch becomes the new master within seconds with minimal traffic disruption

Answer

StackWise elects a standby master that maintains a synchronized copy of the configuration and takes over as active master within seconds if the primary fails.

Question 5

Which Dynamic ARP Inspection (DAI) action causes a switch to drop ARP packets where the sender MAC in the ARP payload differs from the source MAC in the Ethernet header?

Accepted Answer

DAI source-mac validation

Answer

DAI's source-mac validation check compares the ARP sender hardware address with the Ethernet frame source MAC and drops the packet if they do not match.

Cisco ENCOR Practice Test

Cisco ENCOR Practice Test

Cisco ENCOR Lan Switches 5