On the Archer C7 router, click on the Bandwidth Controls - Control Settings button. Here, you can set the maximum upload and download speeds provided by your ISP. Then, in the Rules List, you set the amount you are willing to allocate to any user. The user is specified by IP address and port number, and can be a range.
Since I don't want my kids hogging all of the bandwidth with interactive, multi-player video gaming, I set the IP address range for their devices (192.168.xx.101 to 192.168.xx.199) to 6 mbs up and 40 mbs down. I also include all ports (1 to 65535). This throttles their max speed......but it's still fast enough to enjoy the games. (Comcast provides about 90 mbs down and about 11 mbs up.)
My Tablo sits at 192.168.xx.100 and my Plex server at 192.168.xx.200. Since these are outside of the specified control range, they can use however much bandwidth the need -- which usually isn't very much.
My DHCP is configured to assign addresses between 192.168.xx.100 to 192.168.xx.200. This allows me to use an address reservation in the router to reserve an IP address for the Tablo and the Plex, yet still provide these units "full speed" access. My printer is set to a static address of 192.168.xx.240, so every machine on the network can find it reliably. (Only a few of today's consumer devices allow for "static IP", which is why address reservations on routers have become a popular option.) My access point routers are set at 192.168.xx.2 through 5, so they too have full access speed as they move traffic through the house.
When other daughter moves back this summer, I will enable the guest network feature of the C& with a small range of IP addresses and a greatly limited bandwidth restriction. This guest network will not be PWD protected and will not allow them access to the "in-house" network -- they will only be able to get to the internet, but will be able to do so without a password. She tells me that is all her friends will require when they come over, so they can access Pandora and play their music or watch YouTube.