Cisco interview questions cover coding, system design, and behavioral rounds. This guide lists the most common Cisco interview questions for 2026 with the real interview process, the topics Cisco focuses on, and prep tips — so you know exactly what to expect.
Key Takeaways
- Cisco interviews are rated <strong>Medium-High</strong> difficulty and center on Data structures & algorithms, Networking (TCP/IP, routing), Operating systems.
- The loop has 4 main stages, from the recruiter screen to the final decision.
- Expect coding, system design, and behavioral rounds.
- Practice with the Cisco-specific questions below, then drill the fundamentals in our cluster guides linked at the end.
The Cisco Interview Process
Cisco typically runs the following stages:
- Online assessment / phone screen
- Technical rounds (coding + networking)
- System design
- Behavioral round
What Cisco Looks For
| Attribute | Detail |
|---|---|
| Difficulty | Medium-High |
| Tier | Big Tech |
| Roles | Software Engineer, Network Engineer, Systems Engineer, Security Engineer |
| Focus areas | Data structures & algorithms, Networking (TCP/IP, routing), Operating systems, C/C++ or Java, System design |
Cisco Coding Interview Questions
The most common Cisco coding questions include:
- Implement a trie for IP routing prefixes
- Reverse a linked list
- Detect a cycle in a graph
- LRU cache
- Parse and validate an IP address
- Merge sorted lists
Cisco Behavioral Interview Questions
Prepare structured STAR answers for these Cisco behavioral questions:
- Tell me about debugging a networking issue
- Describe working across hardware and software
- How do you handle on-call responsibilities?
Cisco System Design Questions
For mid-level and senior roles, expect system design prompts such as:
- Design a network monitoring system
- Design a distributed configuration service
How to Prepare for Cisco Interviews
- Review networking fundamentals (TCP/IP, routing, DNS)
- Be strong in C/C++ or Java and data structures
- Know OS concepts like processes and memory
Related Guides
- Drill the fundamentals with our <a href="/blog/software-engineer-interview-questions-answers-2026">software engineer interview questions</a>, <a href="/blog/system-design-interview-questions-answers-2026">system design questions</a>, and <a href="/blog/behavioral-interview-questions-answers-2026">behavioral interview questions</a>.
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Frequently Asked Questions
Yes. Given its networking focus, expect TCP/IP, routing, DNS, and OS fundamentals alongside data-structure coding.
C, C++, and Java are common, especially for systems and networking roles. Focus on data structures and clean code.
Medium-to-high, blending data structures, networking and OS fundamentals, and system design.
Review networking and OS fundamentals, practice data structures in C/C++ or Java, and study a couple of infrastructure system designs.
Cisco interviews are usually conducted over video or a shared coding platform. A desktop tool like GhOst runs outside the browser and stays invisible to screen share and proctoring, so it can provide real-time coding, system design, and behavioral help.
