Practice Test Geeks(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test
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LAN Switching Technologies Flashcards

7 cards from real ICND1 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 LAN Switching Technologies flashcards as text

  1. Which EtherChannel negotiation protocol is Cisco proprietary?

    Answer: PAgP

    Port Aggregation Protocol (PAgP) is Cisco proprietary, while LACP is the IEEE 802.3ad standard.

  2. What happens when a port configured as a PortFast port receives a BPDU?

    Answer: BPDU Guard shuts the port if enabled

    If BPDU Guard is enabled, receiving a BPDU on a PortFast port immediately puts the port in err-disabled state.

  3. How many bits make up a VLAN ID in an 802.1Q tag?

    Answer: 12

    The VLAN ID field in an 802.1Q tag is 12 bits, supporting VLAN IDs 0–4095.

  4. Which type of switch attack exploits the limited size of the MAC address table to force flooding?

    Answer: MAC flooding attack

    A MAC flooding attack fills the CAM table so the switch floods all frames, allowing an attacker to capture traffic.

  5. What is the purpose of a native VLAN on an 802.1Q trunk?

    Answer: It is used for untagged frames traversing the trunk

    The native VLAN carries untagged Ethernet frames across an 802.1Q trunk link.

  6. Which command displays the VLANs that are allowed and active on a trunk interface?

    Answer: show interfaces trunk

    'show interfaces trunk' lists trunk ports with their native VLAN, encapsulation, and allowed VLANs.

  7. In STP, which switch becomes the root bridge?

    Answer: The switch with the lowest bridge ID

    The root bridge is elected as the switch with the lowest Bridge ID, which combines priority and MAC address.