The IT Stuff

Category-6 cable, commonly referred to as Cat-6, is a cable standard for Gigabit Ethernet and other network protocols that is backward compatible with the Category 5/5e and Category 3 cable standards.
Cat-6 give good control over crosstalk and system noise.
Cat-6 cable standard provides performance of up to 250 MHz and is suitable for 10BASE-T / 100BASE-TX [...]

Power over Ethernet (PoE) also known as “inline power” is the ability for the LAN switching infrastructure to provide power over a copper Ethernet cable to an endpoint (Powered Device).It is a revolutionary technology that integrates data, voice and power on standard Ethernet infrastructure providing new options for power distribution. This allows IP telephones, wireless [...]

Gigabit or 1000-Mb Ethernet is the 1998 IEEE 802.3z standard that includes the Gigabit Ethernet MAC and three
physical layers. Gigabit uses 8B/10B encoding and encompasses three physical standards: 1000BASE-SX Fiber
(horizontal fiber), 1000BASE-LX Fiber (vertical or campus backbone), 1000BASE-CX Copper (Copper-Twinax
cabling), and 1000BASE-T.

Increased bandwidth for higher performance and elimination of bottlenecks
Broad deployment capabilities without re-wiring, using [...]

Transmission medium
Topology
Medium Access tecniques

The  transmission medium  used in local area networks are:

Coaxial cable
Twisted pair
Fibre optics
Wireless

.It is also necessary to set a standard access method between computers, so that they know how the computers are exchanging data, especially when more than two computers are sharing the same physical support. This access method is called a logical topology. [...]

What is carrier sense multiple access collision detect (CSMA/CD)?
CSMA/CD describes the Ethernet access method. In CSMA/CD, many stations can transmit on the same cable, and no station has priority over any other. Before a station transmits, it listens on the wire to make sure no other station is transmitting. If no other station is transmitting, [...]