Refer to the exhibit. An architect is designing a network for a customer supporting a Wake-on-LAN application. Which solution must the architect choose?
Scenario, SCCM uses WoL against machines that are turned off to patch them. This is your application server. The direction in this case is very similar. So i am going with D. The workstations need to be woken.
A device that is not directly connected to its destination subnet forwards an IP directed broadcast in the same way it would forward unicast IP packets destined to a host on that subnet. When a directed broadcast packet reaches a device that is directly connected to its destination subnet, that packet is broadcast on the destination subnet. The destination address in the IP header of the packet is rewritten to the configured IP broadcast address for the subnet, and the packet is sent as a link-layer broadcast.
From my point of view, it depends on which has to be the awake device/s. If Server, then should be A, because of being R1 on same subnet and then can redirect the IP broadcast directly. If are the PCs, as Reinier says, then should be D.
I think that could make more sense to wake up the server, but with Cisco...who knows.
"supporting a Wake-on-LAN application".
WoL is mostly for endpoints, and we have application server on drawing.
It seems to be that we have applicaiton server that hosts WoL App and awake devices in LAN > thats why we need directed broadcast on R2 (D)
As I understand "IP directed broadcast" must be supported on the last router to the destination subnet. Since the sleeping PC's dont have IP adresses, the machines must be calles awake by broadcast that behaves like an unicast untill they reach the destination network. There the directed broadcast is handled like a proper broadcast to wake all WOL machines.
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/91672-catl3-wol-vlans.html
It's A.
"An IP directed broadcast is an IP packet whose destination address is a valid broadcast address for some IP subnet but which originates from a node that is not itself part of that destination subnet." (https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/routers/sdwan/configuration/System-Interface/systems-interfaces-book/ip-directed-broadcast.html.xml)
I think that ip direct-broadcast should be configured on R1 interface Fa0/0
Answer is A
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