Last Min Memorization for Net+

What are the RFC 1918 ranges?

10.0.0.0-10.255.255.255

172.16.0.0-172.21.255.255

192.168.0.0-192.168.255.255

Class A

1.0.0.0 - 126.255.255.255, default of /8

Class B

128.0.0.0 - 191.255.255.255, default of /16

Class C

192.0.0.0 - 233.255.255.255, default of /24

Class D (Multicasting)

224.0.0.0 - 239.255.255.255, default of /24

Class E

240.0.0.0 - 255.255.255.255

802.11b

2.4 GHz, 11 Mbps, 20 MHz

802.11a

5 GHz, 54 Mbps, 20 MHz

802.11g

2.4 GHz, 54 Mbps, 20 MHz

802.11n

2.4/5 GHz, 600 Mbps, 20/40 MHz, introduced MIMO

802.11ac

5 GHz, 3.5 Gbps, Up to 160 MHz, introduced MU-MIMO

802.11ax

2.4/5/6 GHz, 9.6 Gbps, Up to 160 MHz

Coaxial Connectors

F-Type: standard threaded connector for cable TV, broadband, sattelite

BNC: Bayonet connector, used in early ethernet and video/test equipment

Fiber Connectors

LC: Little Connector, most popular for datacenters and SFP/SFP+ transcievers

SC: Standard Connector, push-pull, widely usd in enterprise networking, telecom, and fiber-to-home

ST: Straight Tip, half-turn bayonet twist, mainly legacy

FC: Fiber connector, threaded metal used in high vibration environments and test equipment

MPO: Multi fiber push on, packs 12 to 72 fibers in a single ferrule, ideal for backbone cabling

Copper Connectors

RJ-45: Standard 8-pos ethernet connector

RJ-11: 6-pos connector used two to four connectors, used in tellephone lines and DSL

F-Connector: Threaded coaxial connector for cable television and broadband

BNC Connector: Bayonet-style used in older networks or WAN

Twisted Pair Cable Speeds

Cat 5: 100 Mbps

Cat 5e: 1 Gbps

Cat 6: 1Gbps, 10 Gbps only up to 55 meters

Cat 6a: 10Gbps

Cat 7: 10 Gbps

(almost all have a distance of 100m)

PoE standards

802.3af/PoE: 15.4 W

802.3at/PoE+: 30 W

802.3bt/PoE++: 60/100 W