Jossylink Computer Network Technology
26/05/2026
π SUBNETTING MADE EASY π‘π‘
Many students fear subnetting in Networking π
But once you understand the basics, it becomes very easy! β
π What is Subnetting?
Subnetting is the process of dividing one large network into smaller networks called subnets.
π― Why Do We Use Subnetting? β
Reduces network traffic
β
Improves network speed
β
Enhances security
β
Makes IP management easier
β
Helps companies organize departments efficiently
π§ EASY WAY TO UNDERSTAND SUBNETTING
Imagine a school with 500 students in one classroom π³
Communication will be difficult and noisy.
Now divide them into smaller classrooms: βοΈ Class A
βοΈ Class B
βοΈ Class C
Communication becomes faster and organized.
Thatβs exactly what subnetting does in networking! π₯
π Example: IP Address: 192.168.1.0/24
A /24 network gives: β‘οΈ 256 total IP addresses β‘οΈ 254 usable hosts
If we subnet into /26: β
We get 4 smaller networks β
Each subnet has 64 IP addresses
π Simple Formula: Number of Hosts = 2^h - 2
Where: h = number of host bits
π Subnetting is one of the most important skills in: π» CCNA π Cybersecurity βοΈ Cloud Computing π§ Network Engineering
Practice daily and subnetting will become your best friend π
π STEP-BY-STEP GUIDE TO SECURE YOUR ACCESS POINT & WIRELESS ROUTER πΆπ‘οΈ
Hackers often target weak Wi-Fi networks. Follow these simple steps to protect your internet connection and devices. π
β
1. Change the Default Router Password
Most routers come with default usernames and passwords that hackers already know.
β‘οΈ Create a strong admin password immediately.
β
2. Rename Your Wi-Fi Network (SSID)
Avoid using names like βTP-Linkβ or βHuawei123β.
β‘οΈ Use a unique network name that doesnβt reveal your identity or router brand.
β
3. Enable WPA2 or WPA3 Security
Go to Wireless Security Settings.
β‘οΈ Select WPA2-PSK or WPA3 encryption for stronger protection.
β Avoid WEP because it is outdated and easy to hack.
β
4. Use a Strong Wi-Fi Password
Create a password with:
πΉ Uppercase letters
πΉ Lowercase letters
πΉ Numbers
πΉ Symbols
Example: T3ch@2026!WiFi
β
5. Disable WPS (Wi-Fi Protected Setup)
WPS can make connecting easy, but attackers can exploit it.
β‘οΈ Turn it OFF from router settings.
β
6. Update Router Firmware
Manufacturers release updates to fix security vulnerabilities.
β‘οΈ Regularly check for firmware updates.
β
7. Enable MAC Address Filtering (Optional)
This allows only approved devices to connect to your Wi-Fi.
β
8. Hide Your SSID (Optional)
This prevents your Wi-Fi name from appearing publicly.
β‘οΈ Users must manually enter the network name to connect.
β
9. Turn Off Remote Management
Disable remote access unless you truly need it.
β‘οΈ This blocks outsiders from managing your router online.
β
10. Restart & Monitor Connected Devices
Check devices connected to your network regularly.
π¨ Remove unknown devices immediately.
π― BONUS TIP:
Place your router in the center of your office/home to reduce signal leakage outside your building.
π‘ A secured wireless network protects your: βοΈ Personal data
βοΈ Smart devices
βοΈ Business information
βοΈ Internet speed
Follow for more Networking & Cybersecurity
tips π₯π»
π 5 IPS & IDS Devices Every Cybersecurity Professional Should Know π»π‘οΈ
Cybersecurity is all about detecting and stopping threats before they cause damage. Two important security systems used in networks are:
β
IDS (Intrusion Detection System) β Detects suspicious activities and alerts administrators.
β
IPS (Intrusion Prevention System) β Detects and automatically blocks attacks in real time.
π₯ Here are 5 popular IPS/IDS devices and their functions:
1οΈβ£ Cisco Firepower
πΉ Provides advanced threat detection and intrusion prevention.
πΉ Helps block malware, ransomware, and suspicious traffic.
2οΈβ£ Snort IDS/IPS
πΉ Open-source security tool used for monitoring network traffic.
πΉ Detects attacks, scans, and unauthorized access attempts.
3οΈβ£ Palo Alto Networks PA-Series
πΉ Combines firewall protection with IPS features.
πΉ Prevents cyber attacks and controls malicious applications.
4οΈβ£ Suricata IDS/IPS
πΉ High-performance network threat detection tool.
πΉ Monitors traffic in real time and blocks dangerous activities.
5οΈβ£ Fortinet FortiGate
πΉ Offers firewall, IPS, and web filtering solutions.
πΉ Protects organizations from hackers and network intrusions.
π‘ Why are IPS & IDS important?
βοΈ Detect cyber threats early
βοΈ Prevent unauthorized access
βοΈ Protect sensitive company data
βοΈ Improve network security
π Cybersecurity is one of the fastest-growing tech careers in 2026. Learning these tools can boost your networking and security skills!
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