We know that a router is a layer 3 device means Network Layer.
Router is a only device that can forward only uni cast massage.
If u configure the router well and connect the two separate network, i think the network will go finely.
The purpose of a router is to connect dissimilar networks.
a router with relevant different interfaces
A wireless router is usually used to connect internet to your PC without wires but may be used to connect to computers together with the right kind of router.
The network device that connect multiple networks that use the same protocol is a ROUTER.
Use Router/Firewall
For two or more connected networks you can use a bridgeto connect them all together.It depends on the two networks. A bridge can only connect two networks of the same type (eg Ethernet or Token-Ring), that also use the same layer 3 network address (eg IP subnet or IPX network #, or AppleTalk network #).A "gateway" device can connect two dissimilar types that share a network address, and a router can connect two networks of different network addresses whether or not they have the same network type.
A single router, with 2 interfaces, is sufficient.
To connect two devices of the same type together. e.g. You would use a crossover cable to connect a router to another router, a switch to another switch or a computer to another computer. If you are connecting diferent devices together, such as a router to a switch, a straight through cable should be used.
For a small LAN network, a switch is best. To connect two or more LAN networks, a router is required. (2) From Jean Andrews CompTIA A+ sixth edition (page #852): You can use a crossover cable to connect to computers without a switch or hub making it the simplest network of all. For two or more you will need a switch, hub, or router.
we use straight cable to connect between the router and switch as router and switch are different devices.
If you own a large business that is spread all over (like in more than one city or state), then yes, you will need a router as well as a hub. Hubs only connect local systems to one network, whereas a router connects multiple networks together, thus enlarging that single network.
If you want to use wireless internet to connect a second PC to a router, you can use a cable cord, or coaxial cable. This can be hooked directly to the router.