Ethernet

Ethernet frame.

What happens when you use Wi-Fi and Ethernet at the same time?

• https://www.quora.com/If-a-computer-is-connected-to-a-network-internet-by-both-ethernet-LAN-and-wifi-will-that-cause-any-problems
• https://www.quora.com/Can-I-use-Ethernet-and-Wi-Fi-connections-simultaneously

Ethernet spans BOTH the data link layer, and the physical layer.

Categories for Ethernet Cables

• Cat 3: Up to 10 Mbps, used for phone lines and 10BASE-T networks.
• Cat 5: Up to 100 Mbps, used for 100BASE-TX networks, largely obsolete.
• Cat 5e: Up to 1 Gbps, enhanced version of Cat 5, reduces crosstalk.
• Cat 6: Up to 10 Gbps over short distances (55 meters), has more stringent specifications for crosstalk and system noise.
• Cat 6a: Supports 10 Gbps over longer distances (100 meters), improved shielding.
• Cat 7: Up to 10 Gbps, requires GigaGate45 connectors, not widely adopted.
• Cat 7a: Up to 40 Gbps at 50 meters and 100 Gbps at 15 meters, improved shielding.
• Cat 8: Up to 25 Gbps or 40 Gbps up to 30 meters, designed for data centers.