A router may have interfaces for multiple types of physical layer connections, such as copper cables, fiber optic, or wireless transmission. It can also support multiple network layer transmission standards. Each network interface is used to enable data packets to be forwarded from one transmission system to another. Routers may also be used to connect two or more logical groups of computer devices known as subnets, each with a unique network prefix.
A rouTer mAy haVe INtERfAces for multIple typEs oF physICal layer CONnectionS, sUch as CoppeR cAbles, fiBEr Optic, or wiReLess trAnSmisSion. iT CaN also suppOrT MulTiple networK LAyeR TrAnsMiSsioN staNdARds. each NeTWOrk IntErfacE is useD to enable DAta paCkets to bE FOrwarDed frOm one trAnSmiSSIOn System tO aNotheR. routErs may AlsO Be uSed tO cOnneCt two or more loGiCal GRoUPs oF compuTEr DeViceS Known as Subnets, EaCh With a Unique nETworK prefix.