A:Answer I have an old Verizon supplied Actiontec M1424WR router. It is a gigabyte router, but the WiFi is way outdated.
The Actiontec takes the coaxial cable wire output from the main input fiber optic modem and converts it to RJ45 ethernet. It's a router that does the DHCP (assign local IP addresses). The Actiontec also gets the Broadband IP address, Default Gateway, DNS Server IP, etc. from Verizon.
I added this Linksys AC2200 to take over the WiFi. I changed the Linksys to Bridge Mode, which prevents it from duplicating the DHCP work the Actiontec is doing. This effectively turns the Linksys into a new WiFi system only, but it's worth it. In the Actiontec control page, I can turned the "radio" (WiFi) off or leave it on, depending on extra interference vs. extra coverage.
It works great. I had just bought a new laptop and the WiFi was horrible using the Actiontec WiFi, like 5 Mbps download and 20 Mbps upload. I can now get about 95 Mbps up and down. I think that's my FiOS limit.
Since the Linksys is doing WiFi only, I can move it anywhere in the house where there is a single Ethernet Cable. That's a great advantage, since location is very important.