If you have two routers set up, one running RIPv1 and one running RIPv2, neither router will accept updates from the other.
R1: (RIPv1)
RIP: ignored v2 packet from 192.168.1.2 (illegal version)
R2: (RIPv2)
RIP: ignored v1 packet from 192.168.1.1 (illegal version)
Because RIPv1 is a classless protocol, it does not support this access. RIPv1 does not support discontiguous networks. RIPv1 does not support load balancing. RIPv1 does not support automatic summarization.
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.
About midnight is the maximum.
convergence
Use a dynamic routing protocol such as rip, ripv2, ospf, eigrp or igrp. Make the both routers member of the same multicast group and they send messages to each other letting the other one know the status of the connection. If one fails the other one kicks in (courstey of: http://www.owelectric.com).
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.
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.
Distance-vector algorithms refer to routing protocols - protocols used by routers to inform each other about available routes. In distance-vector algorithms, such as RIP or EIGRP, the routers inform each other about their routing tables, and each router adds a metric (or distance) to the route - however, the routers don't know about the topology of the network (unlike the link-state protocols, such as OSPF).
A comunications network.
Sometimes you need to check what frequency they broadcast on.
routers use routing protocols to exchange routing information. check out the link below for lots of information on routing protocols.