Cisco ENCOR Lan Switches 3

Question 1

Which VLAN is used as the native VLAN on a Cisco trunk by default and receives untagged 802.1Q frames?

Accepted Answer

VLAN 1

Answer

VLAN 1 is the default native VLAN on Cisco trunk ports and carries untagged traffic across 802.1Q trunk links.

Question 2

A network administrator wants to prevent rogue DHCP servers on access ports. Which feature should be enabled?

Accepted Answer

DHCP Snooping

Answer

DHCP Snooping classifies ports as trusted or untrusted and drops DHCP offer/acknowledgment messages arriving on untrusted ports.

Question 3

In Rapid PVST+ (802.1w), which port role replaces the traditional Blocking port in classic STP?

Accepted Answer

Alternate port

Answer

RSTP introduces the Alternate port role, which provides a pre-calculated backup path to the root and can transition quickly when the root port fails.

Question 4

What is the purpose of the BPDU Guard feature on a switch port?

Accepted Answer

Shuts down a PortFast-enabled port if it receives a BPDU

Answer

BPDU Guard err-disables a PortFast port immediately upon receiving a BPDU, protecting the STP topology from unauthorized switches.

Question 5

Which EtherChannel mode combination between two switches forms a bundle using LACP without sending negotiation frames from one side?

Accepted Answer

Active – Passive

Answer

LACP Active mode actively sends negotiation frames while Passive mode responds but does not initiate; at least one side must be Active for the bundle to form.

Cisco ENCOR Practice Test

Cisco ENCOR Practice Test

Cisco ENCOR Lan Switches 3