Repeater Practical in Cisco Packet Tracer

Repeater Practical in Cisco Packet Tracer (Step-by-Step Guide)

In networking, maintaining signal strength over long distances is a fundamental challenge. This is where a repeater comes into play. In this practical, we will understand how a repeater works and simulate it using Cisco Packet Tracer.

📌 What is a Repeater?

A repeater is a networking device that operates at the Physical Layer (Layer 1) of the OSI model and in first port its getting signal and in second port regenerate the signal and send to the receiver.

Definition:

A repeater receives a weak or corrupted signal, regenerates it, and retransmits it to extend the network distance.

🔍 Key Features of Repeater

• Works on Layer 1 (Physical Layer)
• Does not understand IP or MAC addresses
• Only regenerates signals
• Used to extend network range
• Cannot filter or route data

🧪 Lab Overview (Your Topology)

From your setup:

• Two switches connected via a Repeater
• Each switch connects to multiple PCs

All devices are in the same network:

10.10.10.0/24

🖥️ IP Addressing

🎯 Objective

• Understand how a repeater extends network connectivity
• Enable communication between two switches
• Test connectivity between distant PCs
• Observe signal regeneration

🛠️ Step 1: Create Topology

Open Cisco Packet Tracer

Add:

• 2 Switches (2960)
• 1 Repeater
• 6 PCs
• Connect:
• PCs → Switches
• Switches → Repeater

👉 Use Copper Straight-Through Cable

🌐 Step 2: Configure IP Addresses

Assign IPs manually:

All PCs in same subnet: 10.10.10.0/24

Subnet mask: 255.255.255.0

👉 No default gateway needed (no router)

📡 Step 3: Test Connectivity

From PC0 → Command Prompt:

ping 10.10.10.6

👉 Expected Result:

✔ Successful reply

🎬 Step 4: Use Simulation Mode

• Switch to Simulation Mode
• Enable all filters
• Run ping again
• Click Auto Capture / Play

🔍 What Happens Internally?

1️⃣ Signal Travels from PC0

Data sent to Switch0

2️⃣ Repeater Regenerates Signal

Receives weak signal

Cleans and retransmits it

3️⃣ Signal Reaches Switch1

Delivered to destination PC (PC5)

⚠️ Important Observations

• Repeater does not filter traffic
• Entire network remains a single collision domain
• All devices share bandwidth

❌ Limitations of Repeater

• No intelligence (cannot make decisions)
• Cannot reduce network traffic
• Cannot improve security
• Rarely used in modern networks

🔄 Repeater vs Hub vs Switch

🧠 Real-World Use

Repeaters are used in:

• Long-distance cable networks
• Fiber optic communication
• Legacy Ethernet setups

👉 In modern networks, switches and routers have replaced repeaters.

💡 Conclusion

This practical demonstrates how a repeater helps extend network distance by regenerating signals. While it plays a foundational role in networking, it lacks intelligence and is rarely used today. Understanding repeaters builds a strong base for learning advanced networking devices like switches and routers.