A:Answer This router apparently uses the old Cat5 standard for wired connections, which is limited to 100 mbps. Cat5e, Cat6 or Cat6e standards allow up to 1000 mbps, so this router must not be using anything but Cat5.
Cat5 standards only use 4 of the 8 wires inside the cable, while the later standards use all 8 wires in the cable. There are more differences in the cables but really this is what keeps Cat5 cables at the slow speed limit of 100 mbps.
Wireless speeds are determined by the frequency. The 2.4 GHz band can support speeds up to 600 mbps and the 5 GHz band supports speeds up to 1300 mbps.