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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.

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

  1. Which protocol provides automatic negotiation of EtherChannel parameters between two directly connected switches?

    Answer: LACP (802.3ad)

    LACP (Link Aggregation Control Protocol, IEEE 802.3ad) dynamically negotiates EtherChannel link bundles between switches.

  2. What happens to traffic on a VLAN when that VLAN is not in the allowed VLAN list on a trunk link?

    Answer: Traffic is dropped and not forwarded across the trunk

    If a VLAN is not included in the trunk's allowed VLAN list, frames tagged with that VLAN ID are dropped at the trunk interface.

  3. A network administrator notices a switch port cycling between up and down states rapidly. Which STP feature would detect this condition and disable the port?

    Answer: BPDU guard

    BPDU guard disables a PortFast-enabled port if it receives a BPDU, placing it in err-disabled state to prevent topology issues.

  4. In a campus network, which switch role is responsible for aggregating access-layer switches and connecting them to the core?

    Answer: Distribution switch

    The distribution layer switch aggregates traffic from multiple access switches and applies policies before forwarding to the core.

  5. What does the native VLAN on an 802.1Q trunk carry?

    Answer: Untagged frames

    Untagged frames received on an 802.1Q trunk are assigned to the native VLAN; frames sent for the native VLAN are transmitted untagged.

  6. Which switch feature forwards traffic based on a combination of source/destination MAC, IP, and port to distribute load across multiple uplinks?

    Answer: EtherChannel with a hashing algorithm

    EtherChannel uses a configurable hashing algorithm (e.g., src-dst-mac, src-dst-ip) to distribute frames across bundled physical links.

  7. A switch port is configured with the command 'switchport mode dynamic desirable'. What will this port do when connected to another switch port set to 'dynamic auto'?

    Answer: Form a trunk because desirable actively initiates trunking

    Dynamic desirable actively negotiates trunking via DTP; when connected to dynamic auto (which passively waits), the desirable side initiates and a trunk is formed.