core 1

what storage devices do laptops contain?

SSD 2.5 inch

M.2

smaller than SSD 2.5, no cable, plug it into a slot

LCD

(liquid crystal display), lightweight, low power, cheap

which laptop display needs a fluorescent or LED backlight?

LCD

what cable does a laptop keyboard use?

ribbon

IPS

good color representation, generally more expensive, wide viewing angles

TN

fast response times, bad viewing angles

VA

good color, bad response times

CCFL

Needs more power, make display thick, old backlight, Cold cathode fluorescent lamp

LED backlight

LEDs around screen edge, or arrays, for newer laptops

inverter

turns DC power into AC power, meaning that it will just put lights on your screen

digitizer

make screen able to use stylus and finger

USB

used for charging and data transfers

Micro USB

smaller USB connection, very common

USB – C

common, used for hosts and devices

Lightning cable

Apple, eight pin signals

DB-9

Connect and view consoles on switches, Routers, and other devices

headset

TRRS (tip ring ring sleeve) is used to plug in Wired headphones, which takes in the information you’re talking Into the mic or getting out through the copper connection plugged into the device

Docking station

put laptop on this device and have all your accessories plugged into it, expansion card options sometimes

Port replicator

similar to docking station, doesn’t have expansion card option, USB connection

2G networks

GSM, global system for mobile communication, and CMDA (Code division multiple access), Both good for voice communication, bad for sending data

GSM

90%, worldwide coverage, SIM card

CMDA

communicate at the same time

3G

more speed, more data connectivity, could use GPS, mobile television, video on demand

LTE/4G

long term evolution, replaced GSM and CMDA as a combined both, 150 MBIT/S

LTE A

rates of 300 mbit/s

5G

100-900 mbit/s

PRL update

allows your phone to understand where all towers are for network used

GPS

as long as device can access 4 satellites, u have info on where ur are

MDM

can manage all company-owned and user-owned devices, centralized managements, set policies on apps, data, etc

MDM configs

makes email configs, (acc details, server address, communication methods), two factor authentication, allow or restrict app installations

network topology

ethernet, DSL, cable system

internet protocol

allows devices to communicate over the internet by assigning IP addresses

TCP and UDP

works along with IP to hold ur data when being transferred

IP process

on one side we have the client, the other side has a server, the client sends info to the server, if sent through ethernet network, everything inside packet is called payload, start had header, end has trailer. in the payload, there is IP, and inside it will be an IP payload, which could have TCP data, with a TCP payload inside, and in the TCP data we could have HTTP data

TCP/UDP def

both are transported in IP2, OSI layer 4, both are ways to move data from place to place

multiplexing

many diff apps on ur system communicating to a separate server all at the same time

TCP

connection oriented, reliable delivery, can recover from errors,

UDP

unreliable but fast delivery

TCP 20

FTP, used for active mode data (data transfer)

TCP/21

FTP, used to control data transfer

TCP/22

secure shell, encrypted communication link, provides secure connection for managing remote devices

port 23

telnet provides less secure connection than port 22

port 25

SMTP, used for email transmission (sending/getting mail)

port 53

DNS, translating domain names into IP addresses

firewalls

uses security rules to see which ports are allowed/blocked

DHCP

assigns IP addresses

port 443

HTTPS (secure/encrypted data)

port 80

HTTP (insecure/unencrypted data)

TLS/SSL

encrypted data sent by establishing secure connections (TLS is more secure than SSL)

POP3

retrieves emails to a single client, downloading them from the server and then removing them from the server

port 143

IMAP, keeps emails in server allowing access from any device

port 445

SMB, file transfer in windows networks

netBIOS

a way to connect over a network (port 137)

ports 161/162

SNMP, monitors networks device like router or switches

port 389

LDAP, allows apps to query directories on a network

port 3389

RDP, lets u control a computer remotely