They provide layer 2 and 3 of the OSI model[0] and usually other related services like DNS, DHCP, email etc. [0] https://en.wikipedia.org/wiki/OSI_model https:

They provide layer 2 and 3 of the OSI model[0] and usually other related services like DNS, DHCP, email etc. [0] https://en.wikipedia.org/wiki/OSI_model https://en.wikipedia.org/wiki/OSI_model