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

Port security

Answer

Dynamic ARP inspection

Answer

802.1X authentication

Question 2

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

Accepted Answer

Forwarding

Answer

Blocking

Answer

Listening

Answer

Learning

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

Trunk port with allowed VLANs 10 and 20

Answer

Two separate access ports bridged together

Answer

A routed port with subinterfaces

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

Forces a port to become the root port immediately

Answer

Increases the speed of STP convergence across the entire network

Answer

Enables a port to participate in rapid STP elections

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

EtherType field

Answer

Source MAC address field

Answer

Frame Check Sequence field

Question 6

A switch shows excessive MAC address table churn, and unknown unicast flooding is degrading performance. What feature can limit the number of MAC addresses learned on an access port?

Accepted Answer

Port security

Answer

Storm control

Answer

BPDU guard

Answer

Dynamic ARP inspection

Question 7

In MSTP (Multiple Spanning Tree Protocol), what is an MST instance (MSTI)?

Accepted Answer

A logical STP topology that maps one or more VLANs to a single spanning tree

Answer

A single STP domain covering all VLANs

Answer

A backup root bridge for a specific VLAN range

Answer

A timer used to synchronize STP regions