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can you connect wireless modem to a switch which will to two routers
Nonroutable.
a serial interface on a router is basically used for WAN communications. we generally connect to other routers through internet using serial interface. In a lab scenario we generally emulate WAN connections by connecting the serial interfaces of the routers using a cable called DCE/DTE cable.
Routers connect via your computer's ethernet input.
Depends on how many switches each router takes. You need a router to connect all the other routers, and then enough switches to make 81. For example, you can use 6 16 port routers to connect the computers and 1 8 port router to connect those routers together
I think it is impossable unless there is wireless networking or a cable between the two buildings I think it is impossable unless there is wireless networking or a cable between the two buildings
Wireless routers only need to be reset if they receive too many connections, such as from torrents.
You can use so called "Bridge" which allows you to extend networks wirelessly. You have to have at least two routers better from the same manufacture with the bridge function support.
Bridge mode allows to connect to geographically separate piece of the same network together. For instance you have one piece of the network in one building and another one in another building. You can't use a cable to connect them together. In such situation you might have to use a bridge.
Routers were designed with purpose to connect different networks.
To connect multiple routers in PacketTracer 5.2, first select the "routers" section in the bottom left hand corner. From there, you can drag two routers from the pane to the right onto the working area (the large white space on your screen). Once both routers are on the screen, click "connections" (the lightning bolt) in the lower left, and click on "Automatically choose connection type" (the first one) OR "Copper crossover" (the fourth one). You will get a cursor that looks somewhat like a taser gun. Click once on each router, and you will see a cable created between them with a red dot on either end. You can now configure and power on both routers, and they will be able to communicate. Be sure when configuring both routers that you go into the Interface section and check that at least one FastEthernet port is set as "ON", so that the routers can communicate.
do you mean routers? and no you dont you can connect quite a few to one on most routers you can connect about 4 wired and quite a few on wireless