300-420 Question #382: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer with an employee ID: 1234:56:789 must design a WoL deployment for a client, and the design must ensure that the Windows PCs are responsive to the WoL magic packets with no delays when the server-side initiates the instruction. Which action must the engineer choose?

Options

• AIP-directed broadcast must be disabled on all interfaces where clients reside.
• BWoL must be enabled on the networking card and disabled in the Windows PCs BIOS.
• CSpanning-tree PortFast must be enabled on all interfaces where clients reside.
• DIP forward protocol must be disabled on all interfaces where clients reside.

Explanation

To ensure Windows PCs are responsive to Wake-on-LAN magic packets with no delays, Spanning-tree PortFast must be enabled on their connected switch interfaces to allow immediate network connectivity upon waking up.

Common mistakes.

• A. Disabling IP-directed broadcast would prevent Wake-on-LAN magic packets from being routed across different subnets, potentially hindering the WoL functionality if the sender is not on the local subnet.
• B. Wake-on-LAN functionality requires it to be enabled in both the networking card settings within the operating system and the system's BIOS/UEFI settings; disabling it in the BIOS would prevent WoL from working.
• D. IP forwarding is a Layer 3 routing function, and disabling it on Layer 2 access interfaces connected to client PCs is irrelevant to Wake-on-LAN operation or network responsiveness.

Concept tested. Spanning-Tree PortFast for end-device connectivity

Reference. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg/swstp.html#wp1089304

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