CompTIA Network+ certification course sum up. Oriented for cybersecurity later courses. *This sheet is quite simplified as its goal is to prepare for cybersecurity certifications. Some purely tech topics are missing.*
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Coaxial
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metal shield to protect data, EMI resistance
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cables
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RG-59, RG-6.
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connectors
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F-connector, BNC
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Twinaxial
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2 inner connectors
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Serial
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DB-9 or DB-25 with serial connector
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9 or 25-pin D-subminiature, used for asynchronous serial communication
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Twisted Pair
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4 pairs twisted for EMI reduction, used for LAN, CAT5-CAT8
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UTP vs STP
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Unshielded vs Shielded Twisted Pair
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Connectors
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RJ11-6pin (phone), RJ45-8pin (Data)
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Bandwith
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theoretical data flow
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Throughput
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mesured data flow
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Straight-Through Patch cables
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T-568B / DTE>DTE, DCE>DCE
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Crossover cables
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T-568B & T-568A / DTE>DCE, DCE/DTE
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MDIX
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electronic method on switches to simulate a crossover cable
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Plenum cable
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fire-retardant coating on UTP/STP cables for non visible locations
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CAT
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Base
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Bandwith
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Max distance
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CAT3
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10BASE-T
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10Mbps
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100m
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CAT5
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100BASE-TX
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100Mbps
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100m
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CAT5e
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1000BASE-T
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1000Mbps
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100m
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CAT6
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1000BASE-T
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1000Mbps
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100m
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10GBASE-T
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10Gbps
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55m
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CAT6a
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10GBASE-T
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10Gbps
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100m
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CAT7
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idem CAT6a with TERA connectors
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CAT8
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40GBASE-T
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40Gbps
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30m
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Fiber Optic Cables
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uses light, immune to EMI, greater range, data-carrying capacity
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SMF
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Single-Mode Fiber
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long distance, 8.3-10µ Ø
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MMF
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MultiMode Fiber
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short distance (2km-), 50-100µ Ø
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Connectors
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SC (Stick and Click) - APC: angled connector
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mnemotechnics
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ST (Stick and Turn)
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LC (Love Connectors)
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MTRJ (Mecanical Transfer-RJ) - UPC: straight connector
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WDM
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Wavelength Division Multiplexing
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combines multiple signals into one signal on different wave lenghts
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Fiber pros
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bandwith+, distance+, EMI protection, security+
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Copper pros
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cost-, easy to install, tools inexpensive
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Media Converters
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L1 device, convert electricity<->light
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Transceivers
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bidi (token), duplex (full/half)
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ex (+Gbps) :
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GBIC, SFP(4.2), SFP+(16), QSFP(40), QSFP28(100), QSFP56(200)
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*Cable distribution*
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MDF
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Main Distribution Frame (root)
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IDF
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Intermediate Distribution Frame
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Patch pannels
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simplifies cable management with switches (front has RJ-45 blocks)
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