Skip to content

Latest commit

 

History

History
208 lines (179 loc) · 5.75 KB

1101 a+ Prepping.md

File metadata and controls

208 lines (179 loc) · 5.75 KB
Raw

Prepping

Practice Questions

Practice questions:

Notes

Need to make notes on:

  • frequencies (2.4 GHz & 5GHz)
  • channels
    • regulations
    • 2.4GHz v.s. 5GHz
  • long-range fixed wireless
    • licensed
    • unlicensed
    • power
    • regulatory requirements for wireless power
  • DHCP
    • leases
    • reservations

What Is...

Mobile Devices

Networking

  • load balancer
  • proxy
  • spam gateway
  • unified threat management
  • IoT device

Hardware

  • form factor
    • 2.5
    • 3.5
    • M.2
    • mSATA
  • RAID 0, 1, 5 and 10
  • NVMe drive
  • PCIe
  • trusted platform module (TPM)
    • provides a hardware random number generator
    • stores cryptographic keys
    • hashes the software and hardware configuration to ensure nothing has been changed
    • can authenticate hardware devices and software
  • hardware security module (HSM)
    • this is a dedicated device for managing security keys, it also performs cryptographic functions like hashing and encrypting
  • multi threading
  • input 110-120 VAC v.s. 220-240 VAC (more importantly what is VAC)
    • 110 VAC means 110 volts AC power
    • higher voltage allows the usage of thinner wires
  • output 3.3V v.s. 5V v.s. 12V
  • 20-pin to 24-pin motherboard adapter
  • redundant power supply
  • modular power supply
  • wattage rating

Virtualization & Cloud Computing

  • cloud models
    • private, public, hybrid, community cloud
    • infrastructure as a service (IaaS)
    • software as a service (SaaS)
    • platform as a service (PaaS)
  • cloud characteristics
    • shared resources
    • metered utilization
    • rapid elasticity
    • high availability
    • file synchronization
  • desktop virtualization
    • virtual desktop infrastructure (VDI) on premises
    • VDI in the cloud
  • purpose of virtual machines
    • sandboxing
    • test development
    • application virtualization
      • legacy software/OS
      • cross-platform virtualization
    • resource requirements
    • security requirements

Hardware and Network Troubleshooting

Apply the best practice methodology to resolve problems

  • always consider corporate policies, procedures and impacts before implementing changes
    • identify the problem
      • gather information from the user, identify user changes and make backups when needed
      • inrequire regarding environmental or infrastructure changes
    • establish a thoery of probable cause (question the obvious)
      • conduct external or internal research based on symptoms
    • test the theory to determine the cause
      • once the theory is confirmed, determine the next steps to solve it
      • if the theory is not confirmed, re-establish a new theory or escalate
    • establish a plan of action to resolve the problem and implement the solution
    • verify the functionality, and if applicable, implement preventative measures
    • document the findings, actions and outcomes

Given a scenario, troubleshoot problems related to motherboards, RAM, CPU and power.

  • common symptoms
    • POST beeps
    • proprietary crash screens (BSOD or pinwheel)
    • black screen
    • no power
    • sluggish performance
    • overheating
    • burning smell
    • intermittent shutdown
    • application crashes
    • ginding noise (the fuck)
    • capacitor swelling (i'm sure it's fine)
    • innacurate system date/time

Given a scenario, troubleshoot and diagnose problems with storage drives and RAID arrays.

  • Common symptoms
    • Light-emitting diode (LED) status indicators
    • Grinding noises
    • Clicking sounds
    • Bootable device not found
    • Data loss/corruption
    • RAID failure
    • Self-monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) failure
    • Extended read/write times
    • Input/output operations per second (IOPS)
    • Missing drives in OS

Given a scenario, troubleshoot video, projector, and display issues.

  • Common symptoms
    • Incorrect data source
    • Physical cabling issues
    • Burned-out bulb
    • Fuzzy image
    • Display burn-in
    • Dead pixels
    • Flashing screen
    • Incorrect color display
    • Audio issues
    • Dim image
    • Intermittent projector shutdown

Given a scenario, troubleshoot common issues with mobile devices.

  • Common symptoms
    • Poor battery health
    • Swollen battery
    • Broken screen
    • Improper charging
    • Poor/no connectivity
    • Liquid damage
    • Overheating
    • Digitizer issues
    • Physically damaged ports
    • Malware
    • Cursor drift/touch calibration

Given a scenario, troubleshoot and resolve printer issues.

  • Common symptoms
    • Lines down the printed pages
    • Garbled print
    • Toner not fusing to paper
    • Paper jams
    • Faded print
    • Incorrect paper size
    • Paper not feeding
    • Multipage misfeed
    • Multiple prints pending in queue
    • Speckling on printed pages
    • Double/echo images on the print
    • Incorrect color settings
    • Grinding noise
    • Finishing issues
    • Staple jams
    • Hole punch
    • Incorrect page orientation

Given a scenario, troubleshoot problems with wired and wireless networks.

  • Common symptoms
    • Intermittent wireless connectivity
    • Slow network speeds
    • Limited connectivity
    • Jitter
    • Poor Voice over Internet Protocol (VoIP) quality
    • Port flapping
    • High latency
    • External interference