Practice Test GeeksCompTIA Practice Test
← All COMPTIA Flashcard Decks

Network+ Ethernet Switching Features Flashcards

7 cards from real COMPTIA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Network+ Ethernet Switching Features flashcards as text

  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?

    Answer: DHCP snooping

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

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

    Answer: Forwarding

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

  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?

    Answer: Access port on VLAN 20 with a voice VLAN configured

    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.

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

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

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

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

    Answer: VLAN ID (VID) field within the 802.1Q tag

    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.

  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?

    Answer: Port security

    Port security limits the number of MAC addresses allowed on a port and can take actions (shutdown, restrict, protect) when the limit is exceeded.

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

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

    An MSTI is a distinct spanning tree instance within an MST region, allowing multiple VLANs to share a single STP calculation.