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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.

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  1. Which Layer 2 feature allows a single physical switch to appear as multiple isolated virtual switches, each with its own spanning tree and MAC table?

    Answer: VLANs

    VLANs logically partition a physical switch into isolated broadcast domains, each acting as a separate virtual LAN segment.

  2. What is the role of the root bridge in Spanning Tree Protocol?

    Answer: It is the reference point from which all STP path costs are calculated

    The root bridge serves as the logical center of the spanning tree; all other switches calculate port costs relative to the path to the root bridge.

  3. A network administrator wants to ensure that a specific switch always becomes the root bridge for VLAN 10. Which STP parameter should be modified?

    Answer: Lower the bridge priority value for VLAN 10 on that switch

    Lowering the bridge priority (in increments of 4096) for a specific VLAN ensures that switch wins the root bridge election for that VLAN.

  4. In a private VLAN (PVLAN) configuration, which port type can communicate with all other ports in the PVLAN, including isolated and community ports?

    Answer: Promiscuous port

    A promiscuous port in a PVLAN can send and receive traffic from all ports, typically used for default gateways or shared services.

  5. Which switch feature allows an administrator to copy all traffic from one port to another for monitoring purposes?

    Answer: Port mirroring (SPAN)

    SPAN (Switched Port Analyzer) mirrors traffic from a source port or VLAN to a destination port where a packet analyzer or IDS is connected.

  6. When a frame arrives at a switch with a destination MAC address that is not in the MAC address table, what does the switch do?

    Answer: Floods the frame out all ports except the receiving port

    When a switch encounters an unknown unicast MAC, it floods the frame out all ports in the same VLAN except the ingress port — a process called unknown unicast flooding.

  7. What is the purpose of the STP root guard feature on a switch port?

    Answer: Blocks a port from becoming the root port if a superior BPDU is received, protecting the current root bridge

    Root guard enforces the root bridge placement by placing a port into root-inconsistent state if it receives a superior BPDU, preventing an unauthorized switch from becoming root.