ពូ អាយធី

17/12/2025

Three-Tier Network Architecture (ស្ថាបត្យកម្មបណ្តាញ ៣ ជាន់) ដែលប្រើជាទូទៅនៅក្នុង Data Center / Enterprise Network ដើម្បីបាន ស្ថេរភាព (High Availability), ល្បឿនខ្ពស់ និង Redundancy។

ខ្ញុំនឹងបកស្រាយពីលើចុះក្រោម 👇

1️⃣ Internet / ISP Layer

មាន ISP-1 និង ISP-2

ភ្ជាប់មកកាន់ Router-1 និង Router-2

ល្បឿន 1Gbps
➡️ គោលបំណង៖

Backup Internet

បើ ISP មួយដាច់ មួយទៀតនៅដំណើរការ

2️⃣ WAN / Router Layer

Router-1 & Router-2

ភ្ជាប់ចូល WAN Switch-1 & WAN Switch-2

WAN Switch ទាំងពីរធ្វើ Stacking
➡️ គោលបំណង៖

Redundancy

Load sharing

កាត់បន្ថយ Single Point of Failure

3️⃣ Firewall Layer (Security Layer)

មាន Primary Firewall & Secondary Firewall

ដំណើរការជា HA (High Availability)

Link 25G (25 Gigabit)
➡️ គោលបំណង៖

ការពារបណ្តាញ (Security)

Automatic Failover បើ Firewall មួយខូច

4️⃣ Core Layer (L3 Switch)

Primary Core Switch L3 & Secondary Core Switch L3

Core Switch ទាំងពីរ Stacking

Link 25G / 10G
➡️ តួនាទី Core Layer៖

Routing (L3)

គ្រប់គ្រង Traffic ទាំងមូល

ល្បឿនខ្ពស់ និង Central Switching

5️⃣ Distribution Layer

មាន Distribution Switch SW-1, SW-2, SW-3, SW-4

លក្ខណៈសំខាន់ៗ៖

Switch ម្នាក់ៗ Stacking

ភ្ជាប់ទៅ Core ដោយ 10G Link

ប្រើ 20G LACP (Link Aggregation)

➡️ តួនាទី Distribution Layer៖

បែងចែក Network Segment

VLAN / Policy

Redundancy និង Load Balancing

6️⃣ Access Layer (L2 Switch)

Access Switch L2

ភ្ជាប់ពី Distribution Switch

ប្រើ 20G LACP
➡️ តួនាទី Access Layer៖

ភ្ជាប់ទៅ Client (PC, AP, IP Phone, Printer, Server)

Layer 2 Switching

🔑 ពាក្យសំខាន់ៗក្នុងរូបភាព

Stacking → Switch ជាច្រើនធ្វើដូចជា Switch មួយ

LACP (Link Aggregation) → រួម Link ច្រើន ឲ្យក្លាយជា Link ធំមួយ

HA (High Availability) → Backup / Failover

L2 / L3 → Switching & Routing

✅ សរុបអត្ថប្រយោជន៍

✔️ High Availability
✔️ No Single Point of Failure
✔️ Scalability
✔️ Performance ខ្ពស់
✔️ សាកសមសម្រាប់ Hotel, Enterprise, Data Center

29/11/2025

Required Internet Speed for a Web Application with 10,000 Concurrent Users
Based on standard web application traffic analysis, a system that supports 10,000 concurrent users requires a stable and high-capacity internet connection. The required bandwidth depends on how much data each user consumes per second, including web page requests, API calls, and peak usage activity.

29/11/2025

29/11/2025

29/11/2025

IT Team Ballroom support

26/11/2025

25/11/2025

In VLAN networking, understanding the difference between Access Ports and Trunk Ports is the foundation of every stable network.

🔵 Access Port
• Connects end-user devices (PC, laptop, printer)
• Carries untagged traffic
• Belongs to only one VLAN

🟠 Trunk Port
• Connects switch-to-switch
• Carries tagged traffic for multiple VLANs
• Allows VLANs to travel across the network

This neon-style diagram helps you visualize how packets move through the network in a modern and easy-to-understand way ⚡🔌

👉 Follow Pu IT Cambodia for more Networking, Linux, and IT tutorials!

23/11/2025

📘 Pu IT Cambodia – Sharing Knowledge for Everyone
Today we learned about Linux File Permissions and how to understand ls -l.
If you are studying DevOps, Linux, or Cloud, this is a must-know skill!
Stay tuned for more simple and clear IT lessons 🇰🇭💻✨

22/11/2025

🔐 How to Install SSH on Ubuntu (Step-by-Step Guide)

Want to manage your Ubuntu server remotely and securely?
Just follow these simple steps:

✅ Update your system
sudo apt update

✅ Install OpenSSH Server
sudo apt install openssh-server -y

✅ Start & enable SSH
sudo systemctl start ssh
sudo systemctl enable ssh

✅ Allow SSH through firewall
sudo ufw allow 22/tcp

✅ Connect to your server
ssh username@your-ip-address

📌 Default SSH Port: 22

With SSH, you can securely:
✔ Access your server remotely
✔ Run commands from anywhere
✔ Transfer files (SCP/SFTP)
✔ Manage networks & cloud servers

20/11/2025

SSH stands for Secure Shell.
It is a secure network protocol used to connect to servers, network devices, or computers remotely over an encrypted connection.
What SSH Does
✔ Allows you to log in to a remote machine
✔ Lets you run commands on the remote machine
✔ Protects your connection with encryption
✔ Supports file transfer (SCP, SFTP)
✔ Used in Linux servers, network equipment, cloud servers (AWS, GCP), etc.
Why SSH Is Important
Security: All data (passwords, commands) is encrypted.
Remote Management: You can control a server from anywhere.
Automation: Often used by DevOps, scripts, Git, CI/CD.