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Networking Interview Questions & Answers

Networking Technical Interview Questions

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What is the difference between a VLAN and a VPN?

A VLAN logically separates a layer-2 network into distinct broadcast domains over shared switching infrastructure. A VPN provides a logical connection or overlay across another network, often with enc...

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How do DHCP and DNS work together without doing the same job?

DHCP supplies network configuration to clients, commonly including an IP address lease, subnet information, default gateway, and DNS server addresses. DNS resolves names to records such as IP addresse...

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What does ARP do, and why does it not find a remote server’s MAC address across the internet?

ARP resolves an IPv4 next-hop address to a link-layer address on the local network. If a destination is outside the local subnet, the host ordinarily resolves the local gateway’s address rather than t...

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Small requests succeed but large transfers stall over a tunnel. How would you investigate MTU issues?

Tunneling adds headers and can reduce the effective path MTU. If oversized packets cannot be fragmented as needed and path-MTU feedback is blocked or mishandled, larger transfers may stall while small...

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