CompTIA Network+ Network+ Ethernet Switching Features 3

Question 1

Which protocol provides automatic negotiation of EtherChannel parameters between two directly connected switches?

Accepted Answer

LACP (802.3ad)

Answer

LACP (Link Aggregation Control Protocol, IEEE 802.3ad) dynamically negotiates EtherChannel link bundles between switches.

Question 2

What happens to traffic on a VLAN when that VLAN is not in the allowed VLAN list on a trunk link?

Accepted Answer

Traffic is dropped and not forwarded across the trunk

Answer

If a VLAN is not included in the trunk's allowed VLAN list, frames tagged with that VLAN ID are dropped at the trunk interface.

Question 3

A network administrator notices a switch port cycling between up and down states rapidly. Which STP feature would detect this condition and disable the port?

Accepted Answer

BPDU guard

Answer

BPDU guard disables a PortFast-enabled port if it receives a BPDU, placing it in err-disabled state to prevent topology issues.

Question 4

In a campus network, which switch role is responsible for aggregating access-layer switches and connecting them to the core?

Accepted Answer

Distribution switch

Answer

The distribution layer switch aggregates traffic from multiple access switches and applies policies before forwarding to the core.

Question 5

What does the native VLAN on an 802.1Q trunk carry?

Accepted Answer

Untagged frames

Answer

Untagged frames received on an 802.1Q trunk are assigned to the native VLAN; frames sent for the native VLAN are transmitted untagged.

CompTIA Practice Test

CompTIA Practice Test

CompTIA Network+ Network+ Ethernet Switching Features 3