Modems and routers are both involved in connecting your home PCs to the Internet. The modem encodes and decodes data so that it can pass between your home network and your Internet Service Provider (ISP). The router, on the other hand, directs the information collected by the modem to devices within that network. The modem brings the information in, and the router distributes (or “routes”) it to different devices like computers and phones.
Data link layer (Layer 2)
Network Layer (Layer 3 devices)
2.One for connection to ISP. Next one to connect with router(For large networks)
Facilitates a connection to the internet by transmitting and receiving data over telephone lines.
Directs data in a network. Passes data between home computers, and between computers and the modem.
Data Transmission form
Can connect to one PC using Ethernet port
Can connect to multiple PCs or networking devices via Ethernet or WiFi
Necessary for Internet Connection?
No, but provide additional security and allow for multiple connections.
Yes. A modem can work without a router, delivering information (such as Internet access) to a single PC.
Routers can share information between computers, but cannot connect to the Internet without a modem.
A router allows computers to connect to the modem and to each other in a network. It selectively delivers packets of information to multiple destinations, and allows multiple devices to connect to the Internet via the modem.