Frame relay is a packet switching technology. It will operate in the data link layer.
Fiber-optic physical or wired connection is the fastest communication connection.
The speed of the transmission data is generally determined by the cables or connectors we use for data transmission. In networking, layer-1 the physical is which deals with the network cables like pins, usb, connectors, etc... we use for data transmission.
The network layer concerns with the packets. It brings the packets from the source to the destination.
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