Top networking interview questions for 2025 cover fundamentals (OSI/TCP/IP, Subnetting), core devices (Routers, Switches, Firewalls), protocols (DNS, DHCP, VPN), security (Firewalls), routing.
Q1: What is the primary function of a router?
Q2: What is the difference between a hub and a switch?
Q3: What is the purpose of a subnet mask?
Q4: How does DNS work?
Q5: What is the difference between HTTP and HTTPS?
Q6: What is a VLAN?
Q7: How does a firewall work?
Q8: What is a VPN?
Q9: What is the difference between IPv4 and IPv6?
Q10: How does DHCP work?
Q11: What is the purpose of a default gateway?
Q12: What is a network protocol?
Q13: How does FTP work?
Q14: What is the difference between a client and a server?
Q15: What is a socket?
Q16: How does SSH work?
Q17: What is the purpose of a network interface card?
Q18: What is a bridge?
Q19: How does Wi-Fi work?
Q20: What is the difference between a modem and a router?
Q21: What is a network topology?
Q22: How does a network switch work?
Q23: What is the purpose of a router's routing table?
Q24: What is a WAN?
Q25: How does a network firewall work?
Q26: What is the difference between a proxy server and a reverse proxy server?
Q27: What is a load balancer?
Q28: How does a network intrusion detection system work?
Q29: What is the purpose of a network access control list?
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