what is a mux
The router is only as good as your internet connection.
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.
Modern networks used two devices for the data packets within the network will flow easily. The two devices are the routers and switches.
OSPF is a link-state routing protocol that helps Routers exchange IP routes. OSPF Adjacencies is the established "neighborship" between two OSPF routers in order to make the exchange of routes. In this case, Adjacency means the same as "peering", that the OSPF speakers (routers) are able to "talk" to each other.
what is a mux
additional ports can be added in modular routers.
The different routers will normall offer the same features. The only difference in these different routers is the quality which is based by price.
There is a difference if you are using a low quality router. For good routers you will not notice any difference. Usually there is no difference at all.
Topology is the actual layout of the network, for instance, where the routers and other devices are located. That would be the networks topology.
The FastEthernet interface of R1 is disabled. One of the default routes is configured incorrectly. A routing protocol is not configured on both routers. The default gateway has not been configured on both routers.
we'll get 4 input mux cuz 2^4=16.... therefore the first 4 input mux has 16 o/p.. hence four-4 i/p mux are required to fill all 16 leads.
As of July 2014, the market cap for McEwen Mining Inc. (MUX) is $706,322,326.55.
Communication
my ball sack
It all depends on perspective. If you look at it as a IP network, the difference is routers used in WAN. If you take in account DNS and other Internet services, the difference is more dramatic.
Routers are more versatile and therefore more complex. Contact your local IT service provider for more details