Networking with Israr

Networking with Israr Network Engineer | CCNA | CCNP | Fortigate Firewall | Routing & Switching | RIP, OSPF, EIGRP, BGP | VPN | Network Security
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FHRP — First Hop Redundancy Protocols Explained!What happens if your network’s default gateway router suddenly fails? Wi...
09/03/2026

FHRP — First Hop Redundancy Protocols Explained!

What happens if your network’s default gateway router suddenly fails? Without redundancy, users can lose connectivity even when the rest of the network is working.

That’s where FHRP (First Hop Redundancy Protocols) comes in. FHRPs allow multiple routers to provide a virtual default gateway, so another router can take over when the active gateway becomes unavailable.

This guide covers:
✅ What FHRP Is & Why It Matters
✅ Virtual IP (VIP) Gateway Concept
✅ HSRP — Hot Standby Router Protocol
✅ VRRP — Virtual Router Redundancy Protocol
✅ GLBP — Gateway Load Balancing Protocol
✅ Gateway Failover & High Availability
✅ HSRP vs VRRP vs GLBP
✅ Load Balancing & Redundancy Concepts

❓ Quick Challenge!

Which FHRP is an open standard commonly used in multi-vendor environments?

1️⃣ HSRP
2️⃣ VRRP
3️⃣ GLBP
4️⃣ EtherChannel

👇 Comment your answer below!

📌 Save this for your CCNA/CCNP and redundancy revision.
🔄 Share it with someone learning high-availability networking.
Follow Networking With Israr for practical Cisco, CCNA & Network Engineering concepts.

Networking Quiz?
09/03/2026

Networking Quiz?

QoS (Quality of Service) — How Networks Prioritize Critical Traffic!When a network becomes congested, not every applicat...
09/03/2026

QoS (Quality of Service) — How Networks Prioritize Critical Traffic!

When a network becomes congested, not every application should be treated the same. Voice calls, video meetings, business apps, and normal data traffic all have different performance needs.

That’s where QoS comes in. It helps network engineers control how traffic is handled so important applications get the right priority, bandwidth, and delay treatment.

This guide covers:
✅ Traffic Classification
✅ DSCP Marking
✅ Queuing & Scheduling
✅ Policing & Shaping
✅ Voice, Video & Data Prioritization
✅ Reducing Delay, Jitter & Packet Loss
✅ Common QoS Mechanisms
✅ Real Cisco QoS Concepts

❓ Quick Challenge!

Which DSCP value is commonly used for Expedited Forwarding (EF) voice traffic?

1️⃣ 0
2️⃣ 8
3️⃣ 34
4️⃣ 46

👇 Comment your answer below!

📌 Save this for your CCNA/CCNP and QoS revision.
🔄 Share it with someone learning enterprise networking.
Follow Networking With Israr for practical Cisco, CCNA & Network Engineering concepts.

IPsec VPN LAB — Site-to-Site VPN with IKEv2 Explained!How do two offices securely communicate over the public Internet a...
09/03/2026

IPsec VPN LAB — Site-to-Site VPN with IKEv2 Explained!

How do two offices securely communicate over the public Internet as if they were part of one private network?

The answer is a Site-to-Site IPsec VPN. In this lab, the Head Office and Branch Office build an encrypted tunnel using IKEv2, AES-256, and SHA-256 so internal networks can exchange traffic securely across the Internet.

This lab covers:
✅ HQ-to-Branch VPN Topology
✅ Inside & Outside Interface Configuration
✅ IKEv2 Proposal & Policy
✅ Pre-Shared Key Authentication
✅ IPsec Transform Set
✅ IPsec Profile Configuration
✅ Interesting Traffic ACL
✅ Secure Site-to-Site Connectivity

❓ Quick Challenge!

Which protocol is responsible for negotiating and establishing the secure VPN parameters in this lab?

1️⃣ OSPF
2️⃣ IKEv2
3️⃣ STP
4️⃣ DHCP

👇 Comment your answer below!

📌 Save this lab for your CCNA/CCNP and VPN practice.
🔄 Share it with someone learning secure enterprise networking.
Follow Networking With Israr for practical Cisco, VPN & Network Engineering labs.

OSPF LAB — Single Area (Area 0) Configuration Explained!OSPF is one of the most important dynamic routing protocols ever...
09/03/2026

OSPF LAB — Single Area (Area 0) Configuration Explained!

OSPF is one of the most important dynamic routing protocols every network engineer should understand.

In this lab, two routers use OSPF Area 0 to automatically learn remote networks and provide communication between LAN 1 and LAN 2.

This lab covers:
✅ OSPF Single-Area Topology
✅ Router Interface IP Configuration
✅ OSPF Process Configuration
✅ Router ID Configuration
✅ Network Statements & Wildcard Masks
✅ Area 0 Configuration
✅ End-to-End LAN Connectivity

❓ Quick Challenge!

Which OSPF area is known as the backbone area?

1️⃣ Area 1
2️⃣ Area 10
3️⃣ Area 0
4️⃣ Area 100

👇 Comment your answer below!

📌 Save this lab for your CCNA & routing practice.
🔄 Share it with someone learning OSPF.
Follow Networking With Israr for practical CCNA, Cisco & Network Engineering labs.

/24 vs /25 vs /26 — Subnetting Made Simple!Choosing the right subnet isn’t just about memorizing masks—it’s about unders...
09/02/2026

/24 vs /25 vs /26 — Subnetting Made Simple!

Choosing the right subnet isn’t just about memorizing masks—it’s about understanding the trade-off between network size and available hosts.

🔵 /24 → 255.255.255.0 → 254 usable hosts
🟢 /25 → 255.255.255.128 → 126 usable hosts per subnet
🟣 /26 → 255.255.255.192 → 62 usable hosts per subnet

As the prefix length increases, you create smaller subnets with fewer host addresses—an essential concept for efficient IP planning, VLAN design, and CCNA subnetting questions.

🧠 Quick Challenge:

You need a subnet for 50 devices. Which is the smallest suitable option?

A) /24
B) /25
C) /26
D) /27

👇 Comment your answer and explain why!

📌 Save this subnetting cheat sheet for your next lab or exam.

🔄 Share it with someone learning networking.
➕ Follow Networking With Israr for practical networking content.

BASIC ROUTER CONFIGURATION — Build Your Cisco Foundation!Every network engineer starts somewhere, and mastering basic ro...
09/02/2026

BASIC ROUTER CONFIGURATION — Build Your Cisco Foundation!

Every network engineer starts somewhere, and mastering basic router configuration is one of the first essential skills for working with Cisco networks.

From assigning a hostname and configuring interfaces to securing access and saving the configuration, these commands form the foundation of countless networking labs.

This guide covers:
✅ Privileged EXEC & Global Configuration Modes
✅ Setting the Router Hostname
✅ Disabling DNS Lookup
✅ Configuring Router Interfaces & IP Addresses
✅ Enabling Interfaces with no shutdown
✅ Setting Enable & Console Passwords
✅ Saving the Running Configuration
✅ Simple Two-Network Lab Topology

❓ Quick Challenge!

Which Cisco IOS command activates a router interface after configuring its IP address?

1️⃣ enable interface
2️⃣ no shutdown
3️⃣ interface up
4️⃣ ip enable

👇 Comment your answer below!

📌 Save this for your CCNA lab practice.
🔄 Share it with someone starting their networking journey.
Follow Networking With Israr for practical CCNA, Cisco & Networking labs.

PACKET LOSS vs LATENCY vs JITTER — Why Is Your Network Slow?A slow network doesn’t always mean low bandwidth. 🌐⚡ Packet ...
09/02/2026

PACKET LOSS vs LATENCY vs JITTER — Why Is Your Network Slow?

A slow network doesn’t always mean low bandwidth. 🌐⚡ Packet Loss, Latency, and Jitter can all affect performance—but each causes a different problem.

🔴 Packet Loss — Some packets never reach their destination, causing freezes, failed downloads, and poor call quality.

🔵 Latency — The delay it takes data to travel across the network, affecting responsiveness and gaming.

🟣 Jitter — Variation in packet arrival times, causing choppy VoIP calls, shaky video, and unstable streaming.

This guide covers:
✅ Packet Loss vs Latency vs Jitter
✅ How Each Problem Affects Your Network
✅ Real-World Symptoms
✅ Network Performance Troubleshooting
✅ Lab Topology
✅ Ping, Traceroute & Pathping Testing

❓ Quick Challenge!

Your VoIP call has choppy audio even though the average latency is low. Which issue is the most likely cause?

1️⃣ Packet Loss
2️⃣ Jitter
3️⃣ DNS
4️⃣ VLAN

👇 Comment your answer below!

📌 Save this for your CCNA & troubleshooting revision.
🔄 Share it with someone who always says, “The network is slow!” 😄
Follow Networking With Israr for practical CCNA, Cisco & Networking concepts.

ROUTER vs SWITCH vs FIREWALL — Know the Difference!They may all sit inside the same network, but each has a completely d...
09/01/2026

ROUTER vs SWITCH vs FIREWALL — Know the Difference!

They may all sit inside the same network, but each has a completely different job. 🌐🔐

🔵 Router — Connects different networks and routes traffic using IP addresses.
🟢 Switch — Connects devices within a LAN and forwards frames using MAC addresses.
🔴 Firewall — Inspects and controls traffic based on security policies to protect the network.

This guide covers:
✅ Router vs Switch vs Firewall
✅ OSI Layer Roles
✅ IP vs MAC-Based Forwarding
✅ VLANs & Local Communication
✅ Traffic Filtering & Network Security
✅ How They Work Together in a Real Network

❓ Quick Challenge!

Which device would you primarily configure to block unauthorized traffic between networks?

1️⃣ Router
2️⃣ Switch
3️⃣ Firewall
4️⃣ Access Point

👇 Comment your answer below!

📌 Save this for your CCNA & networking revision.
🔄 Share it with your networking partner.
Follow Networking With Israr for more practical networking concepts.

Networking Quiz? You are assigned:192.168.1.0/27👉 What is the broadcast address?
09/01/2026

Networking Quiz?

You are assigned:
192.168.1.0/27

👉 What is the broadcast address?

Address

100SH
Houston, TX
23444

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