Tech Matters Udemy Free Learnings

07/04/2026

DHCP Server Configuration (Simple Steps)
Login to Router/Server
Open browser → enter router IP (e.g., 192.168.1.1) → login.
Enable DHCP
Go to Network / DHCP Settings → turn DHCP = ON.
Set IP Range
Example:
Start IP: 192.168.1.100
End IP: 192.168.1.200
Set Gateway & DNS
Gateway: 192.168.1.1
DNS: 8.8.8.8 (or your ISP)
Save & Apply
Click Save → restart router if needed.
💡 Result: Devices automatically get IP address, gateway, and internet access.
Tech Matters Udemy Free Learnings

27/07/2025

OSI LAYER ATTACKS

11/07/2025

Some orders of the :
1- The command (ipconfig) to know your ip
2- The thing (regedit) to open the registry screen for Windows
3- The thing (msconfig) is a helpful tool that enables you to stop running any program when running Windows
4- the task (calc) to open the calculator
5- The command (cmd) to open the tread window
6- The thing (scandisk) or (scandskw) to check the disk
7- the task (taskmgr) to see and control all that is open in the task bar (task bar)
8- command (cookies) to enter the cookies
9- The matter ( defrag )
10- things (help) and possible F1
11 - Temp to access temporary files
12- things (dxdiag) to know all the specifications of your device and all its information
13- The task (pbrush) to run the (painter) program
14 - The command (cdplayer) to play the CD Player.
15- The matter (progman) to open the program Manger
16- Command (tuneup) to turn on the device maintenance processor
17 - Debug to know the type of screen card
18- command (sysedit) to open (system formation editor)
19- Issue (packager) to review the icon changing program
20- Command (cleanmgr) to start the cleaning program
21- Issue (msiexec) Information about the rights of the program and the company
22- The command (imgstart) to start the Windows CD
23- The command (sfc) to retrieve dll files if any file is broken
24- The command (icwscrpt) to copy dll files
25- The (recent) thing to open your recent account and review previously opened files
26- The matter (mobsync) to open a very important program to download internet pages and browse them off the internet afterwards
27- The thing (Tips. An important file that contains the most important secrets of Windows
28- The matter (drwatson) to open Dr. Watson's program to do a comprehensive examination on your device
29- The matter (mkcompat) to change the properties of software
30- The command (cliconfg) to help in the communication network
31- Command (ftp) to open File Transfer Protocol
32- The thing (dvdplay) This is only available in Windows Millennium and this is the application to play the video.
33- The command (osk) to show the keyboard on the screen
34-The Order (gpedit. msc) controls all the policies of the system or deactivate all system joints
35-task(%tmp%) wide access to temp files
36-The Order (perfmon. msc) to monitor your system in a wider view
The order (sysedit) to open the system configuration editor (system configuration editor).
37-Command (cleanmgr) to start the cleaning program
38- Issue (msiexec) Information about the rights of the program and the company.
39-The recent thing to open your recent account and review previously opened files.
40-mobsync to open a very important program for downloading internet newspapers and browsing them off the internet afterwards.
41-The command (drwatson) to open the Dr. Watson program to do a comprehensive examination of your device.
42-The command (ftp) to open the File Transfer Protocol.
43 - The matter (telnet) And this was originally followed by UNIX, after that it was accessed on Windows to connect to servers and network services.
44- The thing (dvdplay) is available only in Windows Millennium, and this is for a program that works
45 - command (soundrecorder) sound recording
46-order (credwiz) request for password recovery
47-The Matter (timedate. cpl) set the date and time
48_The Narrator (narrator) program for reading lists and English conversation squares
49 - The thing (joy. (cpl)game controller and Joystick
The 50-thing (wmimgmt. Infrastructure Management - Management Infrastructure
51-the command (dpiscaling) adjust the screen

11/07/2025

⭕ What are the OSI Model protocols
⬅️ The grid layer is the third level of the model
➡️ Open Systems Interconnection Model
🔰Its role is to divide the computer network into fake layers (Layers), each layer has its own advantages and functions, which are different from other layers. It is also the layer that provides data routing paths. It is a set of standards for the exchange of information. The ISO model has been introduced, which consists of seven different layers. Each layer of the ISO model has its own protocols and functions. Protocols that use data linking and network layers of OSI only are still popular and OSI is a model that helps explain how data is transferred between devices
⚠️ It symbolizes the seven layers with the saying All People Seem To Need Data Processing by taking the first letter of each word
🔶 What are the 7 stages and their functions
1️⃣ physical layers
⬅️ And you are interested in registering the contact data of (Hardware), which is responsible for sending the data prepared by the higher classes via the sending center
✅ Her protocols
ARP - FIBER
✅ her job
It converts the transmitted data to signals whether these are electrical, light or wireless signals
2️⃣ date link layer
⬅️ She is responsible for maintaining synchronization in sending and receiving data and consists of two departments, namely MAC, Media Access Control, LLC or Logical Link Control
✅ some of her protocols
Wan protocol : ATM- ppp - hdlc - isdn
And protocol: 802.5(ring token) 802.3(ethernet)
✅ and these devices work in this class
(Bridges -Switches)
✅ her job
Determining the best time to send data
3️⃣ Network Layer
⬅️ This class identifies itself as a Logical Address of the parties
✅ Her protocols
IP - IPX
✅ her job
This class chooses the best path between the sender and the future
✅ These devices work in this class
(Routers - Layer 3 Switches)
4️⃣ Session Layer
⬅️ Responsible for opening the communication channels between the user and the other party and responsible for managing and closing the session
✅ Her protocols
SQL - X Windows - NFS
✅ her job
You take a sample from the last part of the data and it is sent from the point where it stops sending - open and manage communication channels

5️⃣ Presentation Layer
⬅️ This class is able to determine the type of future information and sender (text - flash - wave - pdf)
✅ Her protocols
WMV - TIFF - BMP -
✅ her job
Preparing the data to take its own range, including photos, videos, texts, compressed files and decompressing the files next to decompressing and encrypting data
️6️⃣ Transport layer
⬅️ Responsible for managing data transfer (flow control) and error correction (error correction), and then identifying the protocol used in the data transfer process.
✅ Her protocols
TCP - UDP
✅ her job
Determining how to send information either (tcp or udp) - The application class is cooperated with the port placement and control the transfer of data
7️⃣ Application Layer
⬅️ It is a program that works through the computer network, which is the stage in which the user deals with the software interface (browser and software) and transfers files and mail .... الخ
✅ some of her protocols
FTP - talent - DNS - HTTP

11/07/2025

VMware ESXi
It is a light operating system that works Hypervisor directly on hardware and turns any actual server into a platform that can run more than an operating system at the same time.
كـ Virtual Machines (VMs).
In other words: you can run such a fake "device" on one real device and each one of them works as if it's completely independent.

I'll tell you its features:
1- Very light and easy to install.
2- It consumes very little resources.
3- High Stability (Uptime Perfect)
4- Strong protection from VMware.
5- You can operate from any browser.
6- You can run Windows, Linux, even testing and testing systems.

- How do you operate it, engineer?
1- Download ESXi from VMware, you will find a free version if you want to try.
2- Burn it on a USB using Rufus for example.
3- Level it on a compatible server or device.
4- After installing, access it from any device via IP.
5- Start operating VMs and install the operating systems that you need.

- Its uses for all categories:
•For companies: Reduce the number of servers, save cost, space and electricity.
•For developers: a robust testing environment.
•For students: Virtual coaching lab.
• For small business: Run more than one service on one device.
• Create Private Cloud inside the company.
- Be mindful ::
I need a Server device with suitable capabilities (RAM and CPU are respected) and depending on what you will install on it.

Confirm your hardware is compatible with VMware

The free version is fine but it has some restrictions like not supporting vCenter

- Why are you starting to learn it?
Because it is one of the most powerful and famous Virtualization systems in the world and its knowledge will open doors to jobs in many companies and you can build an integrated environment for training or management even from home.

- If you want to start or need help, ask me in the comments or send me a private message
And he follows me.
Eng. Hossam Eldeen.

29/06/2025

✅ ️Network Commands for Windows✨💯
Ten Unknown Facts About
1. Founding and History: BMW, Bayerische Motoren Werke AG, was founded in 1916 in Munich, Germany, initially producing aircraft engines. The company transitioned to motorcycle production in the 1920s and eventually to automobiles in the 1930s.
2. Iconic Logo: The BMW logo, often referred to as the "roundel," consists of a black ring intersecting with four quadrants of blue and white. It represents the company's origins in aviation, with the blue and white symbolizing a spinning propeller against a clear blue sky.
3. Innovation in Technology: BMW is renowned for its innovations in automotive technology. It introduced the world's first electric car, the BMW i3, in 2013, and has been a leader in developing advanced driving assistance systems (ADAS) and hybrid powertrains.
4. Performance and Motorsport Heritage: BMW has a strong heritage in motorsport, particularly in touring car and Formula 1 racing. The brand's M division produces high-performance variants of their regular models, known for their precision engineering and exhilarating driving dynamics.
5. Global Presence: BMW is a global automotive Company
6. Luxury and Design: BMW is synonymous with luxury and distinctive design, crafting vehicles that blend elegance with cutting-edge technology and comfort.
7. Sustainable Practices: BMW has committed to sustainability, incorporating eco-friendly materials and manufacturing processes into its vehicles, as well as advancing electric vehicle technology with models like the BMW i4 and iX.
8. Global Manufacturing: BMW operates numerous production facilities worldwide, including in Germany, the United States, China, and other countries, ensuring a global reach and localized production.
9. Brand Portfolio: In addition to its renowned BMW brand, the company also owns MINI and Rolls-Royce, catering to a diverse range of automotive tastes and luxury segments.
10. Cultural Impact: BMW's vehicles often become cultural
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19/06/2025

Basics: DNS - Its important to understand DNS .. Go through it !

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22/05/2025

In the Veem program, while I was learning, I found 3 types of backup modes.
_______

1. Forever Incremental

It takes Full Backup once but at the beginning.

After that, all the backups after that are only Incremental.

In order to retrieve data, the program links the first full and the incrementals.

There is no new Full Backup, it takes again automatically (unless manually).

And here it is useful to reduce the use of space
_______

2. Forward Incremental

Taking Full Backup for the first time.

Then he takes Incremental Backups

According to the policy settings, after a certain number of days or copies, the program:

A new Full can work

Delete the old Full (with the incrementals associated with it).

And we will keep the good performance in the recovery because every now and then he makes a new Full.

______

3. Reverse Incremental

First time taking Full Backup.

After this every time a new backup:

Incremental in terms of the updates.

But the program modifies the old Full Backup to remain the latest version.

It retains the differences in Incremental versions that you can refer back to any time in the past.

يعني:

Full is always the latest.

And the incrementals are keeping the old copies (as opposed to the usual way).

And here it is very fast to restore because you always have the last full version ready.

06/05/2025

06/05/2025

*جہاں لگے تھوڑا سا فرق آ گیا ہے* .
مسکرا دیں،

*خود کو مضبوط کر لیں، ہر جگہ ہر دفعہ وضاحتیں دینا ضروری نہیں ہوتا،*

*مسکرا کر اگلے کے رویے کو ہی رد کرکے آگے بڑھ جانا چاہیے ،*


*کیونکہ آپ سدا کسی کے لئے بھی اہم نہیں رہ سکتے خواہ آپ کتنے بی مخلص کیوں نہ ہوں.* 💯🖤🥀