IS-IS
IS-IS (Intermediate System to Intermediate System) is a method network professionals use to help large networks communicate efficiently. Think of it like a sophisticated mapping system that helps data find the best route through a complex network, similar to how GPS helps you find the best driving route. It's particularly popular in large service provider networks and enterprise data centers. Network engineers often compare it to OSPF, which is another similar system. When you see IS-IS mentioned in a resume, it typically means the candidate has experience with large-scale network design and routing.
Examples in Resumes
Implemented IS-IS routing protocols across multiple data centers
Managed and troubleshot IS-IS networks for major service provider
Designed and deployed IS-IS routing solutions for enterprise network infrastructure
Typical job title: "Network Engineers"
Also try searching for:
Where to Find Network Engineers
Professional Networks
Job Boards
Professional Organizations
Example Interview Questions
Senior Level Questions
Q: How would you design an IS-IS network for a large enterprise with multiple locations?
Expected Answer: A senior engineer should explain how they would plan the network hierarchy, consider scalability, redundancy, and how to integrate with existing systems. They should mention concepts like areas and levels in simple terms.
Q: What challenges have you faced when implementing IS-IS in large networks?
Expected Answer: The candidate should share real-world experiences about managing large networks, troubleshooting problems, and implementing solutions that kept the network running smoothly.
Mid Level Questions
Q: Compare IS-IS with other routing protocols you've worked with.
Expected Answer: Should be able to explain the basic differences between IS-IS and other common routing protocols, focusing on when and why you might choose one over another.
Q: How do you troubleshoot common IS-IS problems?
Expected Answer: Should demonstrate knowledge of basic troubleshooting steps and tools used to identify and fix common network issues.
Junior Level Questions
Q: What is IS-IS and what is its basic purpose?
Expected Answer: Should be able to explain in simple terms that IS-IS is a routing protocol that helps direct network traffic efficiently across large networks.
Q: What are the basic components of an IS-IS network?
Expected Answer: Should understand and explain basic concepts like routers, areas, and levels in simple terms.
Experience Level Indicators
Junior (0-2 years)
- Basic understanding of routing protocols
- Basic network configuration
- Simple troubleshooting
- Network monitoring basics
Mid (2-5 years)
- IS-IS configuration and maintenance
- Network troubleshooting
- Integration with other protocols
- Performance monitoring
Senior (5+ years)
- Large-scale network design
- Complex problem resolution
- Network optimization
- Team leadership and mentoring
Red Flags to Watch For
- No hands-on experience with network equipment
- Lack of understanding of basic routing concepts
- No troubleshooting experience
- No knowledge of related protocols and technologies
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