CompTIA A+ Test Corrections 1 >:p

DOS

Disk-based CLI OS from 80s-90s replaced with GUI systems

Windows can be a

PC and mobile OS

System Configuration

A Windows utility (msconfig.exe) that can identify what processes are launched at startup and can temporarily disable a process from loading.

What to do if Windows Defender starts blocking software/updates?

add an exception

Best physical laptop threat protection

Bitlocker (or disk encryption in general)

Implicit allow/deny

automatically denies all traffic unless explicitly permitted; minimizes unauth access

Explicit allow/deny

requires specific perms be set for access; more labor-intensive

LCD vs OLED

LCD: lightweight, low power, inexpensive, difficult to replace lights

OLED: thinner and lighter, no glass, accurate color, used on smartphones/tablets, emits light when receiving an electrical current

VA LCD

good color, slower response times

NFC

considered secure b/c of short distance and can be used to automate tasks (e.g, alarm silencing or logging into device)

Mobile display components

LCD, digitizer (turns physical input into electrical signals), glass cover

When to replace mobile display

When one component breaks

MAM and MDM

safeguards corporate data by managing all mobile devices on a corporate network

NFC support on iPhones

iPhone 6 and older: NFC only w/ Apple Pay

iPhone 7 and newer: 3rd party app for read/write NFC tags

iPhone12 and newer: Built-in NFC tag capabilities

2.4GHz vs 5GHz

5GHz: greater bandwidth, faster, more interference

2.4GHz: frequency have greater range, lower data transmission rates, 3 non-overlapping channels

Wireless Internet Service Provider

also called long-range fixed wireless: installed in areas with little to no wired infra (rural)

Default gateway/router internal address

address to the network's router

A router has both

an internal and external address

internal address

The private IP address that is translated to an external IP address by NAT (remains hidden by NAT).

External address

The public IP address that NAT uses to communicate with the external network.

What does the CPU require in order for virtualization to be enabled?

SLAT

Dual channel motherboard

4 memory slots, two RAM banks with two slots each

same channels are color-coded

Single RAM still works when on dual channel MB

Duplex fiber connectors

SC & LC

SC connector

- Type of connector used in fiber optic cabling.

- Snap-in with 2.5 mm ferrule.

LC Connector

- Type of connector used in fiber optic cabling.

- Uses a connector likened to RJ-45. It has a smaller form factor and uses 1.25 mm ferrule.

- Preferred for single mode.

VM Sprawl

occurs when an organization has many VMs that aren't managed properly (uncontrolled growth)

VM Sprawl Avoidance

A policy for developing and deploying VMs must be established and enforced.

On-premises vs Cloud VDI

On-premises: hosted on local server

Cloud VDI: stored on remote server

VDI (Virtualization Desktop Infrastructure)

Virtualization software designed to reproduce a desktop operating system as a virtual machine on a remote server.

VM Escape

An attack that allows an attacker to access the host system from within a virtual machine.

VM Escape Protection

The primary protection is to keep hosts and guests up to date with current patches.

NAT mode

VM obtains IP addressing information from its host

NAT Network

Can create a virtual network within the VM that has buffer to the outside world using NAT

Bridged Mode

- vNIC accesses physical network using host machine's NIC

- Obtains own IP address, default gateway, and netmask from DHCP server on physical LAN

host-only mode

VMs communicate only with each other and host.

Internal Network

A virtual network that can be accessed by virtual machines and the Hyper-V host.

Broken components that can cause ghosting

cleaning blade and erasure lamps