CompTIA Network+ Network+ Ethernet Switching Features 2

Question 1

A network administrator wants to prevent a rogue DHCP server from responding to client requests on an access port. Which switch feature should be enabled?

Accepted Answer

DHCP snooping

Answer

DHCP snooping filters DHCP messages on untrusted ports, blocking rogue DHCP servers from responding to clients.

Question 2

Which spanning tree port state actively forwards frames and learns MAC addresses?

Accepted Answer

Forwarding

Answer

The Forwarding state is the only STP state where a port both learns MAC addresses and forwards data frames.

Question 3

A switch port is connected to an IP phone with a PC daisy-chained behind it. The phone traffic needs to be on VLAN 20 and PC traffic on VLAN 10. What port configuration is required?

Accepted Answer

Access port on VLAN 20 with a voice VLAN configured

Answer

Configuring a voice VLAN on an access port allows the switch to tag voice traffic to a separate VLAN while data traffic remains untagged on the access VLAN.

Question 4

What is the purpose of the Spanning Tree Protocol PortFast feature?

Accepted Answer

Allows a port to skip the listening and learning states and go directly to forwarding

Answer

PortFast skips the STP listening and learning states so end-device ports reach the forwarding state immediately upon link-up.

Question 5

Which 802.1Q field is used to carry VLAN membership information inside an Ethernet frame?

Accepted Answer

VLAN ID (VID) field within the 802.1Q tag

Answer

The 12-bit VLAN ID field within the 4-byte 802.1Q tag identifies which VLAN the frame belongs to, supporting up to 4094 VLANs.

CompTIA Practice Test

CompTIA Practice Test

CompTIA Network+ Network+ Ethernet Switching Features 2