CompTIA A+ 220-901 Course Notes

PCI Speed
133 MB/s to 533 MB/s

PCIe (PCI Express) Speed
250 MB/s to 2 GB/s

DDR SDRAM pins
184

SDRAM pins
168

DDR2 and DDR3 SDRAM pins
240

DDR and DDR2 SDRAM (SO-DIMM) pins
200

DDR3 SDRAM (SO-DIMM) pins
204

DDR SDRAM (Micro-DIMM) pins
172

DDR2 and DDR3 SDRAM (Micro-DIMM) pins
214

CD capacity
700 MB

DVD (single layer) capacity
4.7 GB

DVD (dual-layer) capacity
8.5 GB

Blu-ray (single layer) capacity
25 GB

Blu-ray (dual-layer) capacity
50 GB

USB 1.1 low speed
1.5 Mb/s

USB 1.1 full speed
12 Mb/s

USB 2.0 speed
480 Mb/s

USB 3.0 SuperSpeed
5 Gb/s

Thunderbolt v3 speed
40 Gb/s

FireWire 400 speed
400 Mb/s

FireWire 800 speed
800 Mb/s

IrDA (Infrared Data Association) speed
4 Mb/s

SATA 3.0 speed
6 Gb/s

802.11a speed (5 GHz)
54 Mb/s

802.11b speed (2.4 GHz)
11 Mb/s

802.11g speed (2.4 GHz)
54 Mb/s

802.11n speed (2.4 GHz and/or 5 GHz)
600 Mb/s

802.11ac speed (5 GHz)
6,934 Mb/s

FTP (File Transfer Protocol) Port
20/21

SSH (Secure Shell) Port
22

Telnet (Telecommunication Network) Port
23

SMTP (Simple Mail Transfer Protocol) Port
25

DNS (Domain Name System) Port
53

HTTP (Hypertext Transfer Protocol) Port
80

POP3 (Post Office Protocol ver3) Port
110

IMAP4 Port
143

HTTPS Port
443

RDP Port
3389

NetBIOS (name service) Port
137

NetBIOS (datagram service) Port
138

NetBIOS (session service) Port
139

OSI Layers
7 Layers, Application, Presentation, Session, Transport, Network, Data Link, Physical

TCP/IP Layers
4 Layers, Application, Transport, Internet, Network Access

Form Factor Motherboard ATX
ATX, Micro ATX, Mini ITX, nanoITX, pico ITX

Hard Drive insides
Actuator, Actuator arm, spindle, platter, sata, power connector, read/write heads, jumper

Intel CPUs
LGA 775, LGA 1155, LGA1156, LGA1366, LGA1150, LGA2011

AMD CPUs
AM3, AM3+, FM1, FM2, FM2+

network topologies
Bus, Ring, Star, Mesh

network cables
Twisted Pair, Coaxial, Fiber optics - UTP cabling -568a or 568B

network devices
modem,, hub, repeater, switch,NIC, bridge, router, gateway, firewall, proxy

What makes a computer a computer
Input, Storage, Process, Output

Input devices
Keyboard, Mouse, Touchpad, Microphone, Webcam, Touchscreen, Camera

Output devices
Plotter, printer, projector, headphone, speaker, microfilm, monitor, TV, Screen.

Storage devices
Harddrive, external HDD, Flash drive, Memory Card, Pen Drive, Floppy Disk, DVD, CD, Bluray etc

Processing devices
Motherboard, Bus, Memory, CPU

Advance Configuration Power Interface(ACPI)
S0 is ON and S5 is OFF. Highest consumers of electricity turns off first. S1 unused devices turn off such as video, S2 CPU turns off but RAM is on, S3:Standby CPU off but RAM is slow refresh rate, S4:hibernate CPU RAM off and content of RAM saved to hard drive.

Power on Self Test (POST)
BIOS Hardware check before turning control over to the software

BIOS
Basic Input Output System

BSOI
Black Screen of Instruction :)

Redundant Array of Independent Disks(RAID) 0
Data Stripping

Redundant Array of Independent Disks(RAID) 1
Data Mirroring

Redundant Array of Independent Disks(RAID) 5
Data parity

Redundant Array of Independent Disks(RAID) 10
Data Stripping+Data Mirroring

What is inside a CPU?
Registers, ALU, Control Unit, L1, L2 and sometime L3 cache,

What is the cycle of CPU?
Fetch-Decode-Execute-Store

Video Card1
Video card may have DVI , VGA, SVideo

Video Card2
Video card may have DVI , HDMI, mini Displayports

MiniDisplay vs Thunderbolt
Thunderbolt has its own logo.

USBC vs Thunderbolt
Thunderbolt has its own logo.

LC
Fiber Cable Local Connector

ST
Fiber Cable Straight Tip

SC
Fiber Cable Standart Connector

F type
Coaxial Cable Connector

Cat3
1 Mbps - 10 Mbps

Cat5
10 Mbps- 100 Mbps

CAt5e
100 Mbps- 1Gbps

Cat6
1Gbps-10Gbps

Cat6a
1Gbps-10Gbps 100 meters

Cat7
10 Gbps