300-420 Question 103
Select 3A network engineer is designing a campus network that supports Wake-on-LAN (WoL) functionality for remotely powering on devices, as well as Power over Ethernet (PoE) to power IP phones and access points. Which considerations must the engineer prioritize to ensure both WoL and PoE operate effectively in the design?
- A
Ensure switches support IEEE 802.3af or IEEE 802.3at standards for PoE.
- B
Enable Unicast Routing on all network interfaces to support WoL packets.
- C
Allow the forwarding of broadcast traffic required for Magic Packet delivery across VLANs.
- D
Configure Static ARP entries for devices intended to be powered on using WoL.
- E
Ensure switches support sufficient power budgeting to handle all connected PoE devices.
Show answer and explanation
Correct answers: A, C, E
Explanation
To ensure PoE and WoL work effectively in a network design, the engineer must verify that switches adhere to the relevant PoE standards (IEEE 802.3af/at) and have sufficient power capacity for all devices. Additionally, because WoL relies on broadcast Magic Packets, the network must support the forwarding of such packets across VLANs. While features like Static ARP and Unicast Routing are useful in some scenarios, they are not essential for the operation of WoL and PoE.
- A. Correct.
Correct: PoE requires switches to comply with IEEE 802.3af or IEEE 802.3at standards to ensure proper power delivery to devices like IP phones and access points.
- B. Incorrect.
Incorrect: WoL does not depend on Unicast Routing; it relies on broadcast or directed broadcast packets (Magic Packets) to wake devices.
- C. Correct.
Correct: WoL Magic Packets are typically broadcast packets, and network devices must allow the forwarding of these packets across VLANs for WoL to function correctly.
- D. Incorrect.
Incorrect: While Static ARP entries can help in specific cases, they are not a core requirement for WoL. Devices can often be reached without them.
- E. Correct.
Correct: Switches must have enough power budget to supply all PoE devices. Insufficient power provisioning can lead to device outages or functionality issues.