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Welcome to our Certpedia, a glossary of IT terms that you will inevitably come across during your certification studies. To get started, click on a letter above for terms that begin with that letter.



  • 1000BASE-CX - 1000BASE-CX is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 1000BASE-CX uses twinax or short haul copper cabling with 9-Pin shielded D-subminiature connectors, or 8-pin ANSI fiber channel type 2 (HSSC) connectors. Data can be transmitted up to 25 meters at a speed of 1gbps.




  • 1000BASE-LX - 1000BASE-LX is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 1000BASE-LX uses lasers over fiber optic cabling with SC connectors. Data can be transmitted up to 5000 meters at a speed of 1gbps.




  • 1000BASE-SX - 1000BASE-SX is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 1000BASE-SX uses short wavelength lasers over fiber optic cabling with SC connectors. Data can be transmitted up to 550 meters at a speed of 1gbps.




  • 1000BASE-T - 1000BASE-T is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 1000BASE-T uses twisted-pair cabling, category 5e or higher, with RJ-45 connectors. Data can be transmitted up to 100 meters (328 ft) at a speed of 1gbps. The distance can be increased with the use of repeaters.




  • 100BASE-FX - 100BASE-FX is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 100BASE-FX uses fiber optic cabling with ST/SC connectors. Data can be transmitted up to 2000 meters at a speed of 100mbps. The distance can be increased with the use of repeaters.




  • 100BASE-TX - 100BASE-TX is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 100BASE-TX uses twisted-pair cabling category 5 or higher with RJ-45 connectors. Data can be transmitted up to 100 meters (328 ft) at a speed of 100mbps. The distance can be increased with the use of repeaters.




  • 10BASE-FL - 10BASE-FL is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 10BASE-FL uses fiber optic cabling with ST connectors. Data can be transmitted up to 2000 meters at a speed of 10mbps.




  • 10BASE-T - 10BASE-T is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 10BASE-T uses twisted-pair cabling with RJ-45 connectors. Data can be transmitted up to 100 meters (328 ft) at a speed of 10mbps. The distance can be increased with the use of repeaters.




  • 10GBASE-ER - 10GBASE-ER is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 10GBASE-ER uses lasers over either single or multi-mode fiber optic cabling. Data can be transmitted up to 40000 meters at a speed of 10gbps.




  • 10GBASE-LR - 10GBASE-LR is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 10GBASE-LR uses lasers over single-mode fiber optic cabling. Data can be transmitted up to 2000 meters at a speed of 10gbps.




  • 10GBASE-SR - 10GBASE-SR is one of the physical media defined in the IEEE 802.3 Ethernet standard for local area networks (LANs). 10GBASE-SR uses shortwave lasers over multi-mode fiber optics. Data can be transmitted up to 300 meters at a speed of 10gbps.




  • 110 Block is the more modern replacement of the legacy 66 Block and is used as a wiring distribution point for wired telephone systems (voice) and other types of wired networking (data). On one side of the block wires are punched down into RJ-11 connectors for voice and RJ-45 connectors for data communications.




  • 25 Pair is a grouping of 25 pairs of wires all inside a single covering / housing or outer insulation casing. It is best suited for telephone / voice cable runs rather than data cable runs and is generally used as a feeder cable.




  • 66 Block is a legacy type of punch down block used to connect sets of 22 through 26 American Wire Gauge (AWG) solid copper wire in a telephone system. They have a 25-pair standard non-split capacity and generally are unsuited for traffic and data network communications above 10 megabits per second (Mbps).




  • 802.11a - This is an IEEE wireless networking standard that operates in the 5 GHz radio band (ISM frequency band). It can transmit data at speeds up to 54 Mbps. It never became popular because the transmission distance is shorter and the cost tended to be higher.




  • 802.11b - Also known as Wi-Fi, 802.11b is a revision of the 802.11 IEEE standard for wireless networking that operates in the 2.4 GHz radio band (ISM frequency band). It can provide data rates of up to 11 Mbps per second at distances up to approximately 300 feet.




  • 802.11g - Another revision of the 802.11 IEEE standard for wireless networking that operates in the 2.4 GHz radio band (ISM frequency band). Its improved performance over 802.11b is achieved using orthogonal frequency division multiplexing (OFDM). It can provide data rates of up to 54 Mbps per second, but has a slightly shorter range than 802.11b. This is the current standards for wireless networking and is backward compatible with 802.11b.




  • 802.11n - A newer wireless standard that can transmit data at speeds up to 540 mbps and distances up to 600 ft. 802.11n runs at 5GHz and/or 2.4GHz frequencies.




  • 802.1X - 802.1X is an IEEE Standard for port-based Network Access Control (PNAC). This standard is designed to enhance the security of wireless local area networks (WLANs) by providing an authentication framework that allows a user to be authenticated by a central authority. It is used for securing wireless 802.11 access points and is based on the Extensible Authentication Protocol (EAP).








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