Yes they can if they are configured to use the same or similar wireless channels/frequencies. When two wireless routers interfere with each other it is called channel overlap.
The remedy to this problem is to configure each router to use a different channel that is at least 5 channels away from the other.
e.g. Configure router 1 to use channel 6. Configure router 2 to use channel 11.
Some routers also have an 'Auto' option which aims to change channels automatically to avoid interference with other routers or devices.
It's a protocol that routers use to figure out how to get to other devices on the network. Even if they have to go through other routers and different networks.
To stack routers means to physically stack routers. Some stack a couple of routers on top of each other if they plan to just use them as switches or similar.
Linksys routers are pretty much the same as all the other routers. Linksys routers got 8 PINS. You can find the PIN if you turn the router upside down.
RIP is a IGP protocol that allows routers to advertise what they know about their routes to other routers. Since routers operate at the network layer (3), so does RIP.
A Collision occurs when two transmissions interfere with each other.
They can't interfere.
routing protocols
You can find these type of routers on Amazon, Newegg, Buy, TigerDirect and other online electronic retailers. They each have different routers and features.
It's because of collision and broadcast domains. Routers allow to break both.
About midnight is the maximum.
convergence
They are used for computers and laptops for internet, and other things. Wireless N routers are pretty much the same thing as a regular wireless router.