Introduction to Networking

Modem Vs. Router

A modem is a device that connects your home or office network directly to the ISP. The router is also a device that connects (either wired or wireless) multiple devices (i.e. PC, phone etc.) to simultaneously use the internet.

Difference Between Modem and Router

Parameters Modem Router
Definition A modem modulates and demodulates the analog signal with digital and makes a connection between the internet and devices (either single or multiple). The router is an inter-networking device which connects at least 2 or more LAN’s.
Placed A modem is placed between the telephone lines (ISP) and computer or router. A router is placed between networking device and modem
Internet Access To access the internet, modem is essential components because it connects the ISP to our PC. Access of internet without router is possible.
Assign IP Modem Assign local IP address to each device connected to it. It provides optimal path rather than local or public IP.
Working Layer in OSI Model. Modem works on the data link layer of the OSI model. Router works mostly on network layers but can rarely use at the physical and data-link of the OSI model.
Security The modem transmits the data without any authentication. So, it is poor in security. The router provides complete security while packet transmission.
Number of connected devices It is connected to only one device that can be either a router or a computer. Routers can connect to multiple network devices (i.e. switch, computer) using Wi-Fi or Ethernet cable.
Ports Two ports are used to connect the telephone line/ISP and one for the router. It contains alteast 2 ports and can be 4, 6, 8.
Cable Used RJ11 cable is used to connect with a telephone line and RJ45 cable connects with router. RJ45 cable is used in wired router.