Networking with Israr Extra

08/30/2026

VLAN Lab Configuration!

You created VLAN 10 and VLAN 20 on a switch. PCs in the same VLAN can communicate, but PCs in different VLANs cannot.

💡 What is missing?

A) STP Configuration
B) Inter-VLAN Routing
C) DHCP Server
D) Port Security

👇 Comment your answer below!

08/29/2026

VLANs make networks smarter, faster, and more secure!

A VLAN (Virtual LAN) allows you to logically separate devices into different broadcast domains — even on the same switch.

✅ Improves network performance
✅ Enhances security
✅ Reduces broadcast traffic
✅ Organizes departments easily
✅ Essential for every modern enterprise network

👉 💬 Quick CCNA Challenge 👇
What command is used to assign a port to VLAN 20? 👨‍💻
A️⃣ switchport mode trunk
B️⃣ switchport access vlan 20
C️⃣ interface vlan 20

Comment your answer below! 📘

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08/27/2026

SSH Configuration!

08/21/2026

Cisco Switch Configuration Commands – Master the Essentials!

Every great network starts with a properly configured switch. 🚀
Learn the most important Cisco Switch Configuration Commands for CCNA, including VLANs, access ports, trunk ports, SSH, verification commands, and security best practices—all in one place!

💡 CCNA Challenge:

Which command displays all configured VLANs on a Cisco switch?

A) show ip interface brief
B) show vlan brief
C) show running-config
D) show mac address-table

👇 Drop your answer in the comments before checking others!

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08/20/2026

Follow for more professional CCNA, CCNP content

Router-on-a-Stick Topology — Inter-VLAN Routing with One Physical Link

Need devices in different VLANs to communicate while using only one physical router interface? Router-on-a-Stick is one of the most important CCNA inter-VLAN routing concepts to understand.

This topology uses a single 802.1Q trunk link between the Layer 2 switch and router, while router subinterfaces act as the default gateways for each VLAN.

🔹 VLAN 10 — Sales — "192.168.10.0/24"
🔹 VLAN 20 — IT — "192.168.20.0/24"
🔹 Router subinterface "G0/0.10" handles VLAN 10
🔹 Router subinterface "G0/0.20" handles VLAN 20
🔹 802.1Q tagging identifies VLAN traffic on the trunk
🔹 One physical router interface can route traffic between multiple VLANs

💡 CCNA Challenge

Which command tells the router subinterface that it belongs to VLAN 10?

A) "switchport access vlan 10"
B) "encapsulation dot1Q 10"
C) "switchport mode trunk"
D) "ip vlan 10"

👇 Comment your answer before checking others!

📌 Save this topology for your CCNA revision.
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08/20/2026

Create VLANs Like a Network Engineer!

VLANs are one of the most important concepts in switching. They help divide a network into separate logical groups, reduce broadcast traffic, improve performance, and add better control and security.

In this example:
🔹 VLAN 10 = Sales
🔹 VLAN 20 = HR
🔹 VLAN 30 = IT

Each VLAN uses its own subnet and dedicated switch ports, making the network easier to manage and troubleshoot.

💡 CCNA Challenge

Which command is used to verify VLANs on a Cisco switch?

A) "show ip route"
B) "show vlan brief"
C) "show arp"
D) "show cdp neighbors"

👇 Comment your answer below!

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08/18/2026

How Would You Design a Network for a Small Office?

A professional office network isn’t just about connecting devices—it should be secure, organized, scalable, and easy to manage.

This design demonstrates how VLANs can separate Administration, Sales, Finance, Guest Wi-Fi, and Voice traffic while a managed switch and firewall/router keep everything connected and controlled.

💡 Network Engineer Challenge:

If VLAN 10 needs to communicate with VLAN 30, what networking function makes this possible?

👇 Drop your answer in the comments!

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08/16/2026

Network commands!

08/13/2026

Small Office Network Setup — How Everything Connects!

A reliable office network isn’t just about connecting devices—it’s about building the right flow, security, performance, and scalability from the Internet all the way to the users.

🌐 ISP / Internet – Provides the external Internet connection
🔌 ONT / Modem – Converts the ISP connection for your network
🛡️ Firewall – Filters traffic and protects the internal network
🔀 Managed Switch – Connects wired devices and supports VLANs & PoE
📡 Access Point – Provides Wi-Fi connectivity
💻 Users & Devices – PCs, IP phones, printers, laptops, smartphones and more

A common small-office flow is:
ISP → ONT/Modem → Firewall → Switch → Access Point / Wired Devices → Users

🎯 Quick Challenge:

Which device should normally sit between the Internet connection and the internal office network to enforce security policies?

A️⃣ Access Point
B️⃣ Network Printer
C️⃣ Firewall
D️⃣ IP Phone

👇 Drop your answer in the comments!

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08/12/2026

Essential Network Commands Every Network Engineer Should Know!

Whether you’re studying for CCNA, troubleshooting a network, or working in IT support, mastering basic command-line networking tools can save you valuable time and help you quickly identify connectivity problems.

✅ ipconfig — View network configuration
✅ ipconfig /all — Display detailed IP information
✅ ping — Test connectivity to another device
✅ tracert — Trace the path packets take
✅ nslookup — Troubleshoot DNS resolution
✅ netstat -an — View active connections and listening ports
✅ arp -a — Display the ARP cache
✅ getmac — Find MAC addresses
✅ netsh — Configure and troubleshoot network settings

🎯 Quick Challenge:

Which Windows command would you use to trace the route from your PC to a destination?

A️⃣ ping
B️⃣ tracert
C️⃣ nslookup
D️⃣ arp -a

👇 Drop your answer in the comments — no Googling!

📌 Save this command cheat sheet for your next troubleshooting session.
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