10 Network Infrastructure Engineer Interview Questions and Answers for infrastructure engineers

flat art illustration of a infrastructure engineer

1. Can you describe your experience with designing, implementing, and maintaining network infrastructure?

My experience with designing, implementing, and maintaining network infrastructure has been extensive. In my previous role as a Network Infrastructure Engineer at XYZ Company, I led a team of engineers to design and implement a new network infrastructure that improved network performance by 30%. I was responsible for creating specific design documents and network diagrams, including security diagrams, network topology diagrams, and network traffic reports.

  1. Design: During the design phase, I worked with our team to analyze and assess the new infrastructure needs. I then created a network topology diagram that included the placement of all network devices, their configurations, and their access points. Additionally, I recommended new vendor hardware that would ensure the longevity of the infrastructure.
  2. Implementation: During the implementation phase, I led a team of four engineers to set up the new infrastructure. I installed VPN connections, established gateway routers and switches, configured layer 2 and layer 3 protocols, and monitored system performance. I created implementation documents that outlined the necessary steps and provided guidance for each team member regarding their responsibilities and deadlines.
  3. Maintenance: In my current role as a Network Infrastructure Engineer, I have maintained and optimized our network infrastructure, reducing network downtime by 25%. I monitored network performance using various tools such as Wireshark, SolarWinds, and Nagios. I also performed routine maintenance tasks such as installing software updates, replacing hardware, and configuring security settings to ensure the infrastructure's security is always up to date.

My experience with designing, implementing, and maintaining network infrastructure has given me a broad understanding of the critical components of a network infrastructure, including routing, switching, security, and performance analysis. By leveraging my experience and technical skill set, I am confident that I can make significant contributions to your remote team as a Network Infrastructure Engineer in 2023.

2. What types of networking technologies are you most familiar with?

As a Network Infrastructure Engineer, I am most familiar with various networking technologies such as:

  1. Virtual Local Area Network (VLAN) - I have successfully implemented VLAN in a previous project, resulting in improved network security and more efficient network management.
  2. Software Defined Networking (SDN) - I have experience in deploying and managing SDN solutions, which led to reduced network downtime and increased network agility.
  3. Network Address Translation (NAT) - I have configured NAT in several projects, resulting in enhanced security and better network resource utilization.
  4. Border Gateway Protocol (BGP) - I have worked on BGP implementation and optimization, resulting in improved network performance and scalability.
  5. Internet Protocol Version 6 (IPv6) - I have experience in designing and deploying IPv6 networks, resulting in improved network efficiency and better support for future technologies.

In addition, I have a strong understanding of various network protocols such as TCP/IP, UDP, DNS, HTTP, and HTTPS. I stay up to date with the latest industry trends and technologies to ensure that I am always equipped with the necessary knowledge to solve complex networking challenges.

3. What is your experience with network security and firewall management?


  1. My experience with network security and firewall management spans over 8 years where I had the opportunity to work in companies of various sizes and complexities.
  2. At Company A, I was responsible for managing a complex network infrastructure that consisted of multiple firewalls and VPN connections. This infrastructure served thousands of users across multiple locations.
  3. To ensure the security of the network, I implemented a security policy that enforced two-factor authentication, encryption of sensitive data, and regular vulnerability testing.
  4. I also implemented logging and monitoring tools to detect and respond to any security breaches in a timely manner.
  5. As a result of these measures, the network experienced zero security breaches for more than 2 years, which was a significant achievement given the number of users and the complexity of the infrastructure.
  6. At Company B, I was responsible for migrating the network infrastructure to a cloud-based solution. This involved setting up a new firewall infrastructure and configuring rules to ensure that only authorized traffic was allowed to access the network.
  7. Through this process, I learned the importance of having a strong understanding of network security protocols and encryption technologies.
  8. These experiences have enabled me to develop a solid foundation in network security and firewall management, and I am confident that I can leverage this experience to bring value to any organization.

4. How do you troubleshoot network issues and ensure uptime?

As a network infrastructure engineer, I understand the critical importance of ensuring uptime and resolving network issues as quickly as possible. To address these challenges, I use a structured approach to troubleshooting that helps me identify the source of the problem and implement effective solutions.

  1. Define the problem: I begin by gathering data to identify the specific issue and determine its impact on the network. I use network monitoring tools to track performance metrics, such as latency, packet loss, and throughput. This provides a clear picture of the problem and helps me determine the appropriate solution.
  2. Isolate the problem: Once I have defined the problem, I use various diagnostic tools to isolate the specific device, software or configuration that is causing issues on the network. I analyze the logs on the switch, router or firewall to look for errors or anomalies that could lead to downtime.
  3. Implement the solution: With the problem and its source identified, I deploy a solution that minimizes impact and restores the network to the desired state. Depending on the issue, this could involve implementing a software patch, replacing hardware, or reconfiguring a network device.
  4. Document the solution: After the issue has been resolved, I document the solution for future reference. This includes updating network diagrams, creating knowledge-base articles or documenting new network configurations. This helps to reduce troubleshooting time in the future.
  5. Verify solution: I use network monitoring tools to confirm that the solution has been effective and the network is operating optimally. I also configure alerts when similar conditions gain threshold.

Through this troubleshooting approach, I can ensure that network issues are resolved quickly and effectively, minimizing downtime and maximizing uptime. This approach has helped me to maintain up to 99.999% network uptime in my previous roles as a network infrastructure engineer.

5. Have you worked with virtualization technologies like VMware or Hyper-V? If so, can you describe your experience?

Yes, I have extensive experience with virtualization technologies, specifically with VMware. In my previous role as a Network Infrastructure Engineer at XYZ Company, I successfully implemented a virtualized environment that allowed for significant cost savings and increased efficiency.

  1. First, I conducted a thorough needs analysis to identify the company's virtualization needs and determine the best virtualization solution.
  2. Next, I designed and implemented a high-performance VMware vSphere infrastructure that included a cluster of ESXi hosts and a vCenter Server.
  3. I also configured virtual networking, storage, and security policies to ensure that the virtualized environment was secure and met the company's compliance requirements.
  4. To test the performance of the virtualized environment, I conducted a series of benchmarking tests and found that the virtual machines were significantly faster than the physical machines they replaced.
  5. Additionally, the virtualized environment allowed for greater scalability and flexibility, as new virtual machines could be easily added or removed as needed.

In summary, my experience with VMware virtualization technologies has allowed me to successfully implement cost-effective solutions that significantly improve efficiency and performance.

6. What is your experience with network monitoring tools and how have you used them in your previous roles?

During my previous role as a Network Infrastructure Engineer at XYZ Company, I was responsible for deploying network monitoring tools to analyze network traffic, diagnose issues, and detect security threats.

One of the network monitoring tools I used was SolarWinds Network Performance Monitor (NPM). With NPM, I was able to track network performance metrics such as bandwidth utilization, packet loss, and latency. By monitoring these metrics, I was able to identify network bottlenecks and proactively optimize network resources to avoid issues before they occurred. As a result, we achieved a 20% improvement in network performance and a 15% decrease in network downtime.

I also used Wireshark to capture network traffic and analyze packets for troubleshooting purposes. For instance, we were experiencing issues with VoIP calls dropping frequently on the network. I used Wireshark to capture the network traffic during a call and analyzed the packets to identify the root cause of the issue. It turned out that the issue was due to a misconfiguration in a QoS policy. After reconfiguring the policy based on the Wireshark analysis, we were able to reduce the call drop rate by 80%.

Overall, my experience with network monitoring tools has enabled me to identify and resolve network issues proactively, optimize network resources, and improve network performance. I'm confident that I can leverage this experience to contribute to the success of Remote Rocketship as a Network Infrastructure Engineer.

7. Can you share your understanding of cloud networking and how it differs from traditional networking?

Cloud networking refers to the storage, management, and processing of data in the cloud, while traditional networking involves on-premises hardware and equipment.

Cloud networking allows for more flexibility, scalability, and cost-effectiveness compared to traditional networking. For example, a cloud network can adjust its resources based on traffic and usage patterns, while a traditional network may require manual adjustments and upgrades.

Another benefit of cloud networking is the ability to access data and applications from anywhere, as long as there is an internet connection. This makes it easier for remote teams to collaborate and work efficiently.

At my previous job, I helped migrate a company's network infrastructure to the cloud. By doing so, we were able to significantly reduce costs and improve performance. The company's website, which had previously experienced slow loading times during peak traffic periods, saw a 50% increase in speed after the migration.

  1. Cloud networking involves storing and managing data in the cloud, while traditional networking uses on-premises equipment.
  2. Cloud networking is more flexible, scalable, and cost-effective than traditional networking.
  3. Cloud networking allows for easier remote access and collaboration.
  4. A migration to cloud networking can improve performance and reduce costs.
  5. As an example, I helped a company migrate to cloud networking resulting in a 50% increase in website speed during peak traffic periods.

8. Can you describe your experience with load balancing and traffic management?

One of my most significant experiences with load balancing and traffic management was at my previous company, where I was responsible for optimizing the network infrastructure for a high-traffic e-commerce website.

  1. First, I implemented a load balancer that distributed incoming traffic across multiple servers. This reduced server load and improved website latency.
  2. Next, I configured the load balancer to do SSL termination, which offloaded SSL decryption from the application servers, resulting in a substantial reduction in CPU utilization.
  3. Additionally, I implemented content caching to reduce the amount of traffic that needs to be served dynamically.
  4. Finally, I worked with the development team to optimize application server code to take advantage of caching and other performance optimizations. As a result of these initiatives, we were able to increase website responsiveness by 30%.

Furthermore, I have experience with traffic shaping to ensure optimal traffic management. I have implemented Quality of Service protocols to prioritize traffic and manage bandwidth allocation in a way that keeps network resources available for business-critical applications. In my most recent project, I implemented traffic shaping on a small site network, ensuring the continuous operation of a new VoIP phone system they installed recently.

9. How do you stay up to date with new networking technologies and advancements?

Being a network infrastructure engineer, it is imperative to stay abreast of new networking technologies and advancements. To do so, I regularly attend conferences, seminars, webinars and workshops. I believe this not only helps me stay updated but also provides the opportunity to network with other professionals in the field. In addition, I also follow industry leaders and subscribe to their blogs and social media accounts.

  1. As an example, I recently attended a seminar on Software-Defined Networking (SDN). I learned about the benefits of SDN, including its flexibility and cost-effectiveness. I was able to apply this knowledge to recommend and implement SDN solutions in our organization, which resulted in a 20% reduction in network costs.
  2. I also regularly read technical journals such as Network World and attend vendor-provided training sessions. This helps me keep up with the latest technologies and understand how they can be applied to real-life scenarios. For instance, I recently attended a training session on network automation provided by one of our vendors. After applying what I learned, we were able to reduce the time required to configure an access switch by 50%.
  3. Lastly, I invest time in personal projects to learn new technologies hands-on. For instance, I set up a home lab to test out a new network virtualization technology called VXLAN. This allowed me to understand the technology in-depth and recommend it for our organization. As a result, our team was able to achieve better network segmentation with minimal additional hardware costs.

Overall, I believe that staying up-to-date with new networking technologies is essential to remain competitive in the field. By attending seminars, reading industry publications, participating in training sessions, and working on personal projects, I am in a better position to provide innovative solutions, reduce costs, and improve efficiency for my organization.

10. What is your experience with network automation and scripting?

Throughout my experience working in network infrastructure engineering, I've had to manage complex network systems spanning several locations. As a result, I recognized the need for automation to reduce human errors and increase efficiency. I gained proficiency in scripting using Python and Ansible, particularly in automating network configuration tasks and monitoring.

  1. At my previous company, I developed and maintained several automated scripts to demonstrate the effectiveness of automating network tasks. These scripts enabled the automation of network reconfiguration of production Cisco switches and routers. The automation reduced the time needed for a manual reconfiguration from hours to just a few minutes. Moreover, the automation logic ensured consistent configuration while greatly improving the update frequency.
  2. Another significant project I worked on was implementing network monitoring automation using PRTG Network Monitor. I created Python scripts that automatically configured the network monitoring system to analyze network resources and track device health status. As a result, I reduced the need for manual interventions in monitoring alerts and reducing false positives which in turn resulted in a more efficient use of resources.

Overall, my experience with network automation and scripting has greatly benefited past projects, resulting in increased efficiency, consistency, and reduced manual errors. I'm excited about the possibility of expanding my skill set in this area to continue contributing positively to future projects in this field.


Becoming a Network Infrastructure Engineer in 2023 is an achievable goal if you prepare adequately. To ensure you get the job, you must write a captivating cover letter that highlights your skills and experiences in network infrastructure engineering. Our guide on writing a cover letter for infrastructure engineers will guide you through the process. Don't forget to check it out! In addition, your CV must be impressive, highlighting your network infrastructure engineering skills and achievements. Our guide on writing a resume for infrastructure engineers has all the tips and tricks you need to create an excellent CV. Take a look! Finally, if you're looking for a new job opportunity, use Remote Rocketship to search for remote infrastructure engineer jobs. Our job board has a wide range of job opportunities from top companies. Get started today and discover your next career breakthrough.

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