Here are 50 commonly asked networking and network infrastructure questions for interviews and written exams in the field of IT and computer science:

Network Fundamentals:

  1. What is a computer network, and why is it essential in the field of IT?
  2. Describe the OSI (Open Systems Interconnection) model and its seven layers.
  3. What is the difference between a hub, switch, and router in networking?
  4. Explain the concept of network protocols and give examples of commonly used ones.
  5. What is the purpose of the IP address, and how does it work?

Network Topologies:

  1. Define different network topologies, such as star, bus, ring, and mesh.
  2. Explain the advantages and disadvantages of each network topology.
  3. Describe a hybrid network topology and its benefits.

Network Devices:

  1. What is a firewall, and how does it enhance network security?
  2. Define a gateway and its role in connecting different networks.
  3. Explain the function of a proxy server and when it is used.
  4. Describe a load balancer and its significance in network infrastructure.

Network Security:

  1. What are common network security threats, and how can they be mitigated?
  2. Explain the principles of the CIA (Confidentiality, Integrity, Availability) triad in network security.
  3. What is encryption, and how does it protect data in transit and at rest?
  4. Describe the concept of a DMZ (Demilitarized Zone) in network security.

Subnetting and IP Addressing:

  1. How do you subnet an IP address, and why is subnetting important?
  2. What is a subnet mask, and how is it used to create subnets?
  3. Calculate the number of hosts in a subnet given a specific subnet mask.

Routing and Switching:

  1. What is the purpose of routing in a network, and how do routers work?
  2. Explain the differences between static and dynamic routing.
  3. How does VLAN (Virtual LAN) segmentation enhance network efficiency and security?
  4. What is the role of ARP (Address Resolution Protocol) in networking?

Wireless Networking:

  1. Define Wi-Fi and explain the components of a wireless network.
  2. What are the challenges of securing wireless networks, and how can they be addressed?
  3. Explain the concepts of SSID (Service Set Identifier) and BSSID (Basic Service Set Identifier).

Internet and Web Technologies:

  1. How does the Domain Name System (DNS) work, and what is its purpose?
  2. Describe the functions of HTTP and HTTPS in web communication.
  3. Explain the differences between a website, web server, and web browser.

Network Management:

  1. What is SNMP (Simple Network Management Protocol), and how is it used for network monitoring?
  2. Describe the concept of network segmentation and its benefits for management.
  3. How do you troubleshoot network issues, and what tools are commonly used?

Quality of Service (QoS):

  1. Define QoS and explain how it is implemented to ensure network performance.
  2. What is traffic shaping and its role in QoS management?

Cloud Networking:

  1. Explain the concept of cloud computing and its impact on network infrastructure.
  2. What is a virtual private cloud (VPC), and how does it work?


  1. Why is IPv6 adoption necessary, and what are the differences between IPv4 and IPv6?
  2. Describe the IPv6 address format and its advantages.

Network Monitoring and Analysis:

  1. What is packet sniffing, and how is it used for network analysis?
  2. Explain the purpose of Wireshark and other network monitoring tools.

IoT (Internet of Things):

  1. Define IoT and its role in the modern network landscape.
  2. How does IoT security differ from traditional network security?

Software-Defined Networking (SDN):

  1. Explain the concept of SDN and its benefits for network management.
  2. What is an SDN controller, and how does it control network resources?

Virtual Private Networks (VPNs):

  1. Describe the function of a VPN, and how does it ensure secure data transmission?
  2. What is the difference between a site-to-site VPN and a remote access VPN?

Distributed Systems:

  1. Explain the principles of distributed systems and their importance in modern networks.
  2. What are common challenges in designing and managing distributed systems?

Network Troubleshooting:

  1. How do you diagnose network connectivity issues, and what are common solutions?
  2. Describe the process of root cause analysis in network troubleshooting.

These networking and network infrastructure questions cover a wide range of topics and are commonly used to assess a candidate’s knowledge and expertise in the field of IT and computer science.

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