Throw the second nighthawk into vanilla AP mode and plug it into one of the available LAN ports on the first nighthawk from a LAN port itself on the second. (not WAN)
Boom done !
But this is the wrong sub. This is the enterprise sub where people talk about stuff like orthogonal frequency-division multiplexing. You want /r/homenetworking
If you want to know how to calculate the cost, here are a couple of links.
but this is not something you will have to do for the CCNA exam. Or any exam that I'm aware of.
You need a router to do inter vlan routing you have to connect a router to one of the switch and set up sub interfaces for each vlan so they can act as gateways for the vlans to talk to each other
Rite that makes sense, router on a stick type scenario. I don't understand how, even if the vlans are in the same network, there would be any way for hosts in different vlans to talk to each other. Isn't the point of a vlan essentially to limit the broadcast domain? So i'd need default gateways assigned to the hosts to get outside that domain.
yeah you need a gate way to get to 1 vlan to form another just like a physical Lan talking to another physical lan. remember physically there on the same network but logically they are not the the switch looks and the 2 different vlans like a router would look as to different Lans