Connecting an Airport TC to a Cisco Modem/Router

I have just moved and now have 5 people under one roof. So Im trying to figure out whats the best scenario. Our house will have up to 10 devices (Laptops, phones, Xbox, AppleTV.) all running on the same ISP at any given time.  I have a Cisco DCP3825 modem/router acting as a modem & router, using IPV4 with WLAN @ WPA2 personal - AES. and DHCP is on. Its running on N only, at 2.4GHz. Then I have it connected to my AirPort TC in Bridge Mode via Ethernet cable in the WAN port. I am connecting in DHCP mode with 2 DNS servers. I created both a 2.4 and 5GHz channel in WPA2 Personal. I use my TC for Time Machine and didnt want to have to fight for bandwidth while backing up. Since the modem can output its own network, I figured I would make my own and use it just for my Time Machine backups, syncing with my iPhone and general use on my MacBook Pro.
Is this the best set up for the scenario tho. I guess my other options are to put the modem into bridge and Only use the AirPort TC. Or, I can make my AirPort TC extend the modem/routers current network. Keep in mind they are connected via Ethernet and sitting beside eachother on the desk.
Any suggestions and opinions are greatly appreciated. I just want to have the best range and signal quality possible while dealing with so many devices on it at once, all while trying to use Time Machine and AppleTV.

I have it connected to my AirPort TC in Bridge Mode via Ethernet cable in the WAN port. I am connecting in DHCP mode with 2 DNS servers. I created both a 2.4 and 5GHz channel in WPA2 Personal. I use my TC for Time Machine and didnt want to have to fight for bandwidth while backing up. Since the modem can output its own network, I figured I would make my own and use it just for my Time Machine backups, syncing with my iPhone and general use on my MacBook Pro.
Is this the best set up for the scenario tho.
Yes, IMHO you are getting the best out of the equipment.. there is no need to run the TC in router mode.. no advantages really.
You can of course use a long ethernet or EOP (homeplug) adapters and move the TC to some point in a different room to get coverage.
If you have issues with people using more than their fair share.. buy a router with excellent QoS and bandwidth limiting and quota.. ie a cheap router and load gargoyle firmware on it.

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    Message was edited by: Jess1911

    I am not sure if there are different interfaces but my 2wire does an excellent job with line info.
    I get into this from browser.. using main IP.. in my case 10.0.0.138/MDC
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    Give it a try.
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    I rate it the best domestic modem for line info.
    A good modem actually albeit a lousy router.
    MDC is the diagnostics and Management Console.
    3. The future routers will live next to each other in an office and could be linked by a cable (if this is the best route to go).  We do not wish to “expand” the network (in the sense of making a larger WI-FI network), but rather wish to simply have two networks, hence one ADSL router/modem and one router with the “repeater” function (out-of-the-box without any jerry rigging).  Both WI-FI signals need to travel approximately 100 (largely unobstructed) feet.
    You are not repeating.. you are simply setting up two routers which are interconnected, so one is dependent on the other.. ie one is your adsl modem router and that will take the main router function. Your second router is really not working as a router, but as wireless access point (and switch if you plug things in).
    That is perfectly fine. You are not roaming in this case since both routers are running different wireless names and networks.. but they are actually using same IP range.. all devices are on the one IP network with two different wireless access points.
    4. If my dreams come true, the second router would be an Apple Airport Extreme (AX). 
    Apple router is fine for this. Easy to configure out of the box.
    5. Yet, from reading posts and having my prior questions answered on this website, it may be that with an ADSL modem/router, all the ease and happiness of the Apple ecosystem is lost: while Apple routers seem to connect with each other easily, problems appear to arise when users try to inter-marry our non-Apple products with Apples.
    The problem arises when you try and interconnect using  wireless extend or repeater.. you are not using wireless to extend, you are using ethernet. Wired has no issues.
    11. Based in part on LaPastenague’s earlier advice, I want to buy the TP-LINK TD-W8980 N600 Wireless Dual Band Gigabit ADSL2+ Modem Router (2.4GHz 300Mbps+5Ghz 300Mbps, IPv6 Compatible). This appears to be the most popular ADSL device on Amazon now.
    Will this modem/router work EASILY with the Airport Extreme in the manner I’ve described?  That is, connecting the two with a cable and creating two WI-FI networks.
    It is a good choice.. It should be fine considering how poor your line is.. this modem is proving to have a couple of bugs.. it does not handle torrents well but I would suggest your system is not being used for that purpose. It has some port forwarding issues. Again you are probably not going to overload it. 
    12. Also, is it generally correct that the best way to connect them is with an Ethernet cable: https://discussions.apple.com/message/23759755#23759755
    Absolutely best.. only decent method. 
    14. If this will work, what “mode” will the AX device be in (again, in order to have two separate networks with separate passwords)?  I have heard of the “repeater”, “roaming” , and “bridge” modes.
    Bridge. Although if it gives issues there is another method, although rather complex to setup.. not something to worry about now.
    15.  Are there two levels of passwords which need to be considered?  Of course, there is the network and network passwords which we create here and which will be different.  But, does the Apple also have to have the ISP password like the principle ADSL modem/router?
    Only the adsl modem has the ISP authentication.. it is the box that does the link. The TC just piggy backs.
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