Explain the OSI model and its seven layers.

What is the difference between TCP and UDP?

How does ARP (Address Resolution Protocol) work?

IP Addressing:

What is the purpose of subnetting?

Explain the difference between IPv4 and IPv6.

How is DHCP used in a network?

Routing and Switching:

Describe the difference between a router and a switch.

How does VLAN (Virtual Local Area Network) work?

Explain the concept of routing tables.

Network Security:

What are some common security threats to a network?

How does a firewall function, and what is its role in network security?

Explain the concept of VPN (Virtual Private Network).

Protocols:

What is DNS (Domain Name System) and how does it work?

Explain the purpose of ICMP (Internet Control Message Protocol).

How does NAT (Network Address Translation) work?

Troubleshooting:

Describe your approach to network troubleshooting.

How would you identify and resolve network congestion issues?

What tools do you use for network monitoring and analysis?

Wireless Networking:

Explain the differences between 2.4 GHz and 5 GHz wireless frequencies.

How do you secure a wireless network?

What is the purpose of SSID in a wireless network?

Experience and Scenarios:

Can you share a challenging network-related problem you've encountered in your previous role and how you resolved it?

How do you handle network outages or downtime?

Describe a situation where you had to implement a network upgrade or expansion.

Network Management:

How do you ensure network performance and reliability?

What is SNMP (Simple Network Management Protocol) used for?

How would you plan for capacity and scalability in a network?

Continuous Learning:

How do you stay updated on the latest trends and technologies in networking?

Have you pursued any relevant certifications, and if so, which ones?