Cisco ENCOR Lan Switches 2

Question 1

Which Spanning Tree Protocol feature allows a port to immediately transition to the forwarding state when connected to an end device?

Accepted Answer

PortFast

Answer

PortFast skips the listening and learning STP states so end-device ports forward immediately without waiting the standard 30 seconds.

Question 2

A switch receives a frame with a destination MAC address not found in its CAM table. What action does it take?

Accepted Answer

Floods the frame out all ports except the ingress port

Answer

When a destination MAC is unknown, the switch floods the frame out all ports in the same VLAN except the port it arrived on — this is called unknown unicast flooding.

Question 3

Which EtherChannel negotiation protocol is Cisco proprietary?

Accepted Answer

PAgP

Answer

Port Aggregation Protocol (PAgP) is Cisco's proprietary protocol for negotiating EtherChannel link bundles, whereas LACP is the IEEE 802.3ad standard.

Question 4

In PVST+, which switch is elected as the root bridge for each VLAN?

Accepted Answer

The switch with the lowest bridge ID (priority + MAC)

Answer

The root bridge is elected as the switch with the lowest bridge ID, which is the combination of the bridge priority and MAC address.

Question 5

Which command configures a switch port as an 802.1Q trunk that allows all VLANs?

Accepted Answer

switchport trunk encapsulation dot1q followed by switchport mode trunk

Answer

You must first set the encapsulation to dot1q, then set the mode to trunk; without both commands the port does not become an active 802.1Q trunk.

Cisco ENCOR Practice Test

Cisco ENCOR Practice Test

Cisco ENCOR Lan Switches 2