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$Wi-Fi signals: reflection, absorption, diffraction, scattering, and interference$

Random Access Memory(RAM)

Sunny Classroom

Sunny Classroom

Random Access Memory(RAM)

Stack and Queue

How your browser secure your communications over the Internet?

A Brief History of the WEB

A brief history of Computer Storage Media

ARP poisoning and Port mirroring attacks

Switch attacks: MAC Flooding and MAC Spoofing

Network Devices to Protect your Intranet

Malware 2: Rootkit, keylogger, logic bomb, adware, & botnet

Malware: virus, worm, Trojan horse, spyware, & ransomware

How does cellular network work?

How does SNMP work?

General switch vs managed switch

Summary of six dynamic routing protocols

Distance-vector vs link-state and a hybrid EIGRP

Link state routing protocols: IS to IS and OSPF

Distance vector routing protocols: RIP and IGRP

static vs dynamic routing & routing metrics

Five factors of Authentication

AS : Interior and border routers, Border Gateway Protocol

ChatGPT: A mind-blowing AI

All about Bluetooth

How does a SOHO router works

Routers, functions, interfaces and ports

13 types of computer networks

SMS phishing attacks and how to prevent them

Data Storage Types: File, Block, & Object

The ElGamal Algorithm: a simple example

Intro to the ElGamal Cryptosystem

How to test if g is a primitive root of a prime number p?

The RSA - A simple math example

The RSA Algorithm with math formulas

Prime, coprime , modulo operation, and congruence modulo

DHKE: Demo in math - part 2/2

DHKE : Demo with mixing colors - part 1/2

One - way function & trapdoor function in modern cryptography

Three types of VPN

Browsing darknet sites

HTTPS & Tor for Privacy and Anonymity

How does the Tor network hide your traffic?

Installing and using Tor Browser

The Onion Router (Tor) Network

DAS, NAS, & SAN

FIFO and GFS - tape backup rotation schemes

Surface net, Deep net, and darknet

Data Backup: Full, Incremental, and Differential

The 3-2-1 backup rule

The Swiss Cheese Model for Cyberattacks

CompTIA Security+ : Forensic data collection order

Disaster Recovery Sites: hot, warm, & cold

RAID: 0, 1,5, 6, 01, & 10

CompTIA Network+ : Troubleshooting Model

Armored virus infection: appender, split, & Swiss cheese

Scam, hoax, prank, spam, SPIM, & SPIT

Pharming by DNS poisoning & Domain Hijacking

How to spot a phishing email - case 2

How to spot a phishing email - case 1

The 6 most common types of phishing attacks

Breaking Cyber Kill Chain

The Cyber Kill Chain

TCP session: Circle of Life

How to display TCP/UDP connections?

Session, connections, sockets, & ephemeral ports

Three categories of TCP/UDP port numbers

What and why virtual ports (port address)?

All about USB

Computer ports - physical ports

CompTIA Network+ Performance-based Tests - port numbers

Straight through, crossover, rollover - Where & When to use what?

RJ-45 Connector Pinouts -Type A and Type B

Network Troubleshooting Tools

Wire Mapping: reversed, crossed, split, open, & short

Serial transmission vs parallel transmission

UPS: Offline vs Online

10 common power quality problems

CRAC System with cold/hot aisles in Data Center

Structured Cabling Beyond a Star-Topology Network