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Network+ Ethernet Switching and VLANs 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 and VLANs flashcards as text

  1. What is the default VLAN on most Cisco switches, and which VLAN should NOT be used for user data as a security best practice?

    Answer: VLAN 1; avoid VLAN 1

    VLAN 1 is the default VLAN on Cisco switches; best practice dictates moving user data off VLAN 1 to reduce attack surface since many management protocols use it by default.

  2. Which STP variant significantly reduces convergence time by introducing Rapid Spanning Tree Protocol?

    Answer: IEEE 802.1W

    IEEE 802.1W defines Rapid Spanning Tree Protocol (RSTP), which reduces convergence time from 30-50 seconds (classic STP) to a few seconds.

  3. A switch port connected to a workstation should have which STP feature enabled to prevent it from ever becoming a root port?

    Answer: PortFast

    PortFast immediately transitions an access port to the forwarding state, bypassing listening and learning states — appropriate only for ports connected to end devices, not other switches.

  4. What mechanism prevents a PortFast-enabled port from causing switching loops if a rogue switch is connected?

    Answer: BPDU guard

    BPDU guard disables a PortFast port if it receives a BPDU, preventing a rogue switch from disrupting the STP topology.

  5. Which inter-VLAN routing method uses a single physical link between the router and switch, with multiple logical sub-interfaces?

    Answer: Router on a stick

    Router on a stick uses one physical trunk link with sub-interfaces on the router — each sub-interface handles routing for a different VLAN.

  6. What is the purpose of the native VLAN on an 802.1Q trunk link?

    Answer: It carries untagged frames across the trunk

    The native VLAN carries untagged frames across an 802.1Q trunk; both ends of the trunk must agree on the same native VLAN to avoid mismatches.

  7. A network administrator wants to allow multiple switch ports to share the same VLAN database automatically. Which protocol facilitates this?

    Answer: VTP

    VLAN Trunking Protocol (VTP) propagates VLAN configuration from a VTP server to client switches, keeping the VLAN database synchronized.