Comptia A+ 220-901 Quick Study Cram

I’m gearing up to take my CompTIA A+ 220-901 exam and sometimes the best way to learn is to write about it! This quick study cram guide will help you remember some of the basics such as networking protocols, memory size + pins, and more. If you have anything to add, please put it in the comments below.

Networking Protocols

  • FTP, file transfer protocol, Port 21
  • SSH, secure shell, Port 22
  • Telnet, Port 23
  • SMTP, simple mail transfer protocol, Port 25 (and port 587)
  • DNS, domain naming system, Port 53
  • HTTP, hyper text transfer protocol, Port 80
  • POP3, post office protocol, Port 110
  • IMAP, internet message access protocol, Port 143
  • HTTPS, HTTP secure, Port 443
  • SMB, server message block, Port 445 and 137-139
  • AFP, Apple filing protocol, Port 548 or 427
  • RDP, remote desktop protocol, Port 3389

Wireless Versions

  • 802.11a, 54 Mb/s, 5 GHz
  • 802.11b, 11 Mb/s, 2.4 GHz
  • 802.11g, 54 Mb/s, 2.4 GHz
  • 802.11n, 300/600 Mb/s, 5 and 2.4 GHz
  • 802.11ac, 1.7 Gb/s+, 5 GHz

IP Addresses

  • Class A range: 1-126, subnet mask: 255.0.0.0. Private: 10.x.x.x
  • Class B range: 128-191, subnet mask: 255.255.0.0. Private: 172-16.0.0-172.31.255.255
  • Class C range: 192-223, subnet mask: 255.255.255.0. Private: 192.168.x.x

Loopback address is 127.0.0.1. APIPA is 169.254.x.x. IPv6 uses 128-bit hexadecimal numbers. Short hand in IPv6 includes two colons.

Random Access Memory

DIMMs include:

  • DDR – 184 pins
  • DDR2 – 240 pins
  • DDR3 – 240pins
  • DDR4 – 288pins

RAM SODIMMS include:

  • DDR – 200 pins
  • DDR2 – 200 pins
  • DDR3 – 204 pins
  • DDR4 – 260 pins

Processors

The CPU takes care of calculations for the system. AMD CPUs use FM1, FM2, FM2+, AM3, and AM3+ sockets. Intel CPUs use LGA775, 1150, 1155, 1156, 1366, and 2011 sockets.

Cabling Standards

  • Category 3 is rated for 10 Mb/s
  • Category 5 is rated for 100 Mb/s
  • Category 5e is rated for 100 Mb/s and gigabit networks
  • Category 6/6a is rated for 10 Gb/s and gigabit networks
  • Category 7 is rated for 10 Gb/s and gigabit networks

Laser Printing Process

The process for laser-printing is Processing, Charging, Exposing, Developing, Transferring, Fusing, and Cleaning.

RAID Types

  • Raid 0 – Striping
  • Raid 1 – Mirroring
  • Raid 5 – Striping with Parity
  • Raid 10 – mirrored sets in a striped set

OSI Model

Just remember this: All people seem to need data processing. Or, 1: Physical, 2: Data, 3: Network, 4: Transport, 5: Session, 6: Presentation, 7: Applications. The mnemonic puts the model in reverse order, but helped me remembering the layers.

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