Mubarek Kemal

22/04/2026

🌐🏗️ 3-Layer Hierarchical Network Design — Simplified!

Designing a reliable network isn’t just about plugging in devices—it’s about building a structured, scalable architecture. This visual breaks down the 3-layer model used in enterprise networks:

🔹 Core Layer
⚡ High-speed backbone
🔁 Redundancy & fast switching (L2/L3)

🔹 Distribution Layer
🛡️ Policy enforcement (ACLs, QoS)
📡 Routing & traffic control

🔹 Access Layer
💻 Connects end devices (PCs, phones, printers, Wi-Fi)
🔌 Entry point to the network

💡 Key Takeaway:
👉 A good network is not just about connecting switches…
👉 It’s about designing for performance, scalability, and reliability.

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💬 Comment if you want real-world design examples
🔁 Share with someone learning networking

22/04/2026

Network subnet simplified
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20/04/2026

⁉️ Network security (የኔትወርክ ደህንነት) ማለት በአንድ የኮምፒውተር ኔትወርክ ውስጥ ያሉ መረጃዎች እና መሠረተ ልማቶች ካልተፈቀደ መግቢያ፣ አላግባብ ከመጠቀም ወይም ከመሰረቅ ለመጠበቅ የሚከናወኑ ስልቶችና የጥበቃ እርምጃዎች ስብስብ ነው።

ዋናው ዓላማው የኔትወርክን ተደራሽነት (Usability) እና ታማኝነት (Integrity) ማረጋገጥ ነው።

1. የኔትወርክ ደህንነት ሶስቱ ምሶሶዎች (CIA Triad)
ማንኛውም የኔትወርክ ጥበቃ በእነዚህ ሶስት ነጥቦች ላይ ያተኩራል፦

✳️ Confidentiality (ሚስጥራዊነት): መረጃው እንዲያየው ለተፈቀደለት ሰው ብቻ መድረሱን ማረጋገጥ።

✳️ Integrity (ትክክለኛነት): መረጃው ከነበረበት ሁኔታ ሳይለወጥ ወይም ሳይደባለቅ መቆየቱን ማረጋገጥ።

✳️ Availability (ተደራሽነት): ኔትወርኩ እና መረጃው ለተጠቃሚዎች በሚፈልጉበት ጊዜ ዝግጁ መሆናቸውን ማረጋገጥ።

2. የጥበቃ አይነቶች (Types of Security Control)
ኔትወርክን ለመጠበቅ ሶስት ዋና ዋና የጥበቃ መንገዶች አሉ፦

🛜 Physical Security (አካላዊ ጥበቃ): እንደ ራውተር (Router) እና ሰርቨር (Server) ያሉ እቃዎችን በቁልፍ ወይም በጥበቃ መጠበቅ።

🛜 Technical Security (ቴክኒካዊ ጥበቃ): በሶፍትዌር እና በቴክኖሎጂ የሚደረግ ጥበቃ። ለምሳሌ፦

🛜 Firewalls: መጥፎ የኔትወርክ እንቅስቃሴዎችን የሚከለክል አጥር።

🛜 Encryption: መረጃን በምስጢር ኮድ መለወጥ።

Administrative Security (አስተዳደራዊ ጥበቃ): ተጠቃሚዎች ሊከተሏቸው የሚገቡ ህጎች እና መመሪያዎች (Policies)።

3. የተለመዱ ጥቃቶች እና መከላከያዎች

🚷 Malware: እንደ ቫይረስ ያሉ ጎጂ ሶፍትዌሮች። (መከላከያ፦ Antivirus)

🚷 Phishing: የሰዎችን የይለፍ ቃል ለማታለል የሚላኩ መልዕክቶች። (መከላከያ፦ Awareness)

🚷 DDoS Attack: አንድን ኔትወርክ ስራ ለማስቆም በከፍተኛ ትራፊክ ማጨናነቅ።

4. ጠቃሚ የጥበቃ መሣሪያዎች

▶️ VPN (Virtual Private Network): የኢንተርኔት ግንኙነትን ደህንነቱ የተጠበቀ ለማድረግ።

▶️ Intrusion Prevention System (IPS): ወደ ኔትወርክ የሚገቡ ጥቃቶችን የሚለይና የሚያስቆም ሲስተም።

▶️Multi-factor Authentication (MFA): ከይለፍ ቃል በተጨማሪ ሌላ የማረጋገጫ ዘዴ (ለምሳሌ በስልክ የሚላክ ኮድ) መጠቀም።

⭕️ ባጠቃላይ የኔትወርክ ደህንነት ማለት መረጃዎቻችን በሰላም ከአንድ ቦታ ወደ ሌላ ቦታ እንዲጓዙና በኮምፒውተራችን ላይም በጥንቃቄ እንዲቀመጡ የሚያደርግ የጥበቃ ስርአት ነው።

20/04/2026

25/03/2026

እንዴት ሠርተፊኬቱን መውሰድ እንዳለባቹ እገዛ ከፈለጋቹ inbox me

25/03/2026

ብዙዎቻችሁ የሆነ ኮርስ ስትመዘገቡ ቅድሚ ፈተና እየመጣባችሁ እንደተቸገራችሁ እየገለፃችሁልኝ ነው።

የ ኮርሶች ፈተና የላቸውም። እየመጣላችሁ ያለው ፈተና የኮርሱ ማጠቃለያ ፈተና ነው። ያ ማለት ሙሉ ኮርሱን ከጨረሳችሁ በሗላ የምትመዘኑበት ፈተና ስለሆነ ቅድሚያ ኮርሱን ውሰዱ።

24/03/2026

መልሱ ኮመንት ላይ አስቀምጡ

17/03/2026

የመጀመሪያው ሌየር Physical Layer ይባላል የሚያተኩረው የኔትወርክ ሀርድዌር ላይ ይሆናል።

Physical Layer – Hardware World 🔌
Cables, signals & connectors live here.
If hardware fails, network fails ❌
Base of all networking.

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17/03/2026

🌐 Internet vs Intranet – What’s the Difference?

Many people use the internet every day, but not everyone understands the difference between the Internet and an Intranet. Both are networks that allow devices to communicate and share information, but they serve very different purposes.

Understanding this difference is important for anyone learning about computer networking, IT infrastructure, or cybersecurity.

Let’s break it down in simple terms.
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What Is the Internet?

The Internet is a massive global network that connects millions of computers, servers, smartphones, and other devices around the world. It allows people and organizations to communicate, share information, and access online services.

When you browse websites, watch videos, send emails, or use social media, you are using the internet.

The internet is considered a public network, meaning anyone with an internet connection can access it.

Examples of services on the internet include:

• Search engines like Google
• Video platforms like YouTube
• Social media websites
• Online shopping platforms
• Cloud services

All of these services operate on servers connected to the global internet infrastructure.

Because the internet is open and accessible worldwide, security is extremely important. Websites often use technologies such as HTTPS encryption, authentication systems, and firewalls to protect user data.
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What Is an Intranet?

An Intranet is a private network used within an organization such as a company, university, or government department.

Unlike the internet, an intranet is not open to the public. Only authorized users within the organization can access it.

An intranet often uses the same technologies as the internet, including:

• Web browsers
• Internal websites
• File servers
• Email systems
• Collaboration tools

However, access is restricted to employees or members of the organization.

17/03/2026

7ቱ የኦኤስአይ ሞዴል(OSI model) ሌየሮች እነዚህ ናቸው።
በቀጣይ ሰባቱም ሌየሮች አንድ በአንድ እናያቸዋለን።
Follow ማድረግ እንዳይረሱ🤝