Modem provides internet, WiFi, we can connect multiple devices to internet through modem.
Modem provides radiation of short wavelength and the transmitter in your mobile phones and computers convert those radiations into digital signals and vice-versa.
Answer:
The transport layer
Explanation: Layer 4, is the transport layer of the Open System Interconnection (OSI), that handles message transfer of data between end systems or hosts and ensures complete packets transfer.
