Cisco, Best Network Simulators

To prepare for Cisco Certified Network Associate (CCNA) and Cisco Certified Network Professional (CCNP) exams, it's essential to choose a tool that provides robust features for simulation and configuration practice. Here are some of the best options:

Cisco Sandbox

Features: Cisco Sandbox provides a real-world environment with access to actual Cisco hardware and software for testing configurations and scenarios.

Best For: Advanced practice, especially for scenarios that require interaction with the latest Cisco technologies.

Limitation: Access might be limited or require specific conditions such as having a current Cisco contract.

Key Features:

• Instant access to a wide range of pre-built labs and network topologies.
• Comes with pre-configured setups for various Cisco technologies.
• Supports integration with third-party tools and technologies.
• Facilitates API-based access for automation and orchestration.
• User-friendly web portal

Cisco Modeling Labs (CML)

Features: CML is a network simulation tool that allows you to set up, configure, and troubleshoot complex networks using virtual Cisco routers and switches.

Best For: Professionals who need a scalable and flexible environment to simulate complex network architectures.

Limitation: It is a paid product, which might be a consideration for personal study.

Key Features:

• Utilizes real Cisco IOS, IOS XE, IOS XR, NX-OS, and ASA software.
• Allows creation and customization of complex network topologies.
• Supports scalable network simulations, suitable for small to large environments.
• Multi-User Support, ideal for teams and educational settings.
• Includes pre-built lab exercises and network scenarios

Cisco Packet Tracer

Packet Tracer is a popular network simulation tool that allows for creating network topologies and imitating modern computer networks. It is designed to help those new to networking and experienced users alike.

Best For: Beginners and intermediate users preparing for CCNA and basic CCNP scenarios due to its ease of use and wide accessibility.

Limitation: May not support all advanced routing features and protocols needed for in-depth CCNP preparation.

Key Features:

• Drag-and-drop interface
• Simulation and real-time mode
• Supports various Cisco devices and network topologies
• Interactive tutorials and labs

GNS3

GNS3 allows you to run actual Cisco IOS images and simulate complex networking scenarios. It supports a range of Cisco devices as well as third-party devices and is highly extensible.

Best For: Advanced users who need to simulate more complex networks typically encountered in CCNP and even CCIE preparations.

Limitation: Requires obtaining Cisco IOS images separately, which may not be straightforward for all users.

Key Features:

• Uses real Cisco IOS images
• Highly customizable and scalable
• Supports a variety of network devices
• Integration with VirtualBox and VMware

EVE-NG

EVE-NG is a powerful network emulator with support for multiple image types, including Cisco IOS, and integrates with both virtual and real devices.

Best For: Advanced network simulation for both CCNA and CCNP preparations, with support for extensive network models and third-party integration.

Limitation: Setup can be complex and also requires access to IOS images.

Key Features:

• Multi-vendor support
• HTML5 web interface
• Highly scalable
• Community and professional editions available

Boson NetSim

It is a network simulator specifically designed for Cisco certification exams. It offers a wide range of lab exercises and practice scenarios that closely mimic real-world networking environments.

Key Features:

• Extensive lab exercises for CCNA, CCNP, and other Cisco certifications
• Virtual network devices with realistic behavior
• Integrated with Boson's exam preparation software
• Detailed lab manuals and solutions

UNetLab (Unified Networking Lab)

The predecessor to EVE-NG, UNetLab is another network emulator that supports a range of network devices and allows for the creation of complex network scenarios.

Key Features:

• Supports multiple vendors and device images
• Web-based interface
• Easily deployable and scalable
• Comprehensive community support

Cisco VIRL (Virtual Internet Routing Lab)

Cisco VIRL is an official Cisco network simulation platform that offers a highly realistic network modeling experience using real Cisco operating systems.

Key Features:

• Official Cisco software
• Supports a wide range of Cisco devices and technologies
• Pre-built and customizable network scenarios
• Scalable and supports multi-user environments

Summary

1. Cisco Sandbox: Ideal for developers and engineers looking for a versatile and easily accessible platform.
2. Cisco Modeling Labs (CML): Suitable for professional and enterprise-level users needing robust and accurate network simulation.
3. Cisco Packet Tracer: Best for students and beginners due to its ease of use and comprehensive learning resources.
4. GNS3: Great for professionals and advanced users, offering flexibility and high simulation accuracy with real IOS images.
5. EVE-NG: Perfect for professionals working with multi-vendor environments, providing scalability and a web-based interface.
6. Boson NetSim: Tailored for certification candidates, offering extensive lab exercises and realistic network scenarios.
7. UNetLab: A good choice for professionals requiring high simulation accuracy and multi-vendor support.
8. Cisco VIRL (VIRL-C): Designed for professional and advanced users, providing high accuracy and scalability with official Cisco support.

Recommendations

• For Beginners (CCNA Focus): Cisco Packet Tracer is an excellent starting point due to its simplicity, educational resources, and support from Cisco. It's especially useful for visual learners and those new to networking concepts.
• For Advanced Studies (CCNP Focus): GNS3 and EVE-NG are better suited for advanced studies. They offer more realistic and comprehensive environments which are essential for mastering the complex scenarios covered in CCNP exams.
• For Real-World Practice: If accessible, Cisco Sandbox and Cisco Modeling Labs provide a real-world feel with actual Cisco software, which can be beneficial for understanding real equipment behavior and advanced troubleshooting.