I used a 2.4 GHz router and made it an AP on my 5 GHz network. I was not concerned about the difference in wireless speeds on the AP because I would only primarily be using the Ethernet switch ports. However I did test both wireless and hardwired connections and did not notice a lag in speed with the devices connected to the AP.
Why Should You Add an AP?
1. Extends the coverage of your home network - wireless/Ethernet
2. Adds more switch port connections - Ethernet
3. Money saver, versus purchasing an Ethernet switch
Tips
1. You can use a wireless and or switch port router
2. You may not want to name the AP the same name as your 1st router
a. If there is any gray area, it may take longer to determine the issue
3. Make sure to assign the AP an IP address that is higher on the IP spectrum, avoiding duplication
i.e. 192.XXX.XXX.250
4. Make sure to disable DHCP on the AP
5. Test the Ethernet ports of the AP to verify you have internet access before deployment
6. The process is fairly simple, it took me 20 minutes to configure both routers4. Make sure to disable DHCP on the AP
5. Test the Ethernet ports of the AP to verify you have internet access before deployment
Scenarios Adding An AP Would Be A Resolution?
1. Wireless signals drop in certain areas. So add an AP, in order to gain access to additional ports
2. A room in your home is too far away to obtain DHCP. So you add an AP as a resolution
3. Use the AP as media server
References
http://www.linksys.com/us/support-article?articleNum=134478
https://www.youtube.com/watch?v=2228IVtKLT0