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Networking Advanced

What is Anycast?

A network routing technique where the same IP address is announced from multiple locations, directing users to the nearest server.

Anycast assigns a single IP address to multiple servers in different geographic locations. Network routing protocols (BGP) automatically direct each user's traffic to the nearest server instance. This provides automatic load distribution, DDoS mitigation (attack traffic is absorbed across all locations), and low latency (users connect to the closest node). CDN providers, DNS services (Cloudflare, Google Public DNS), and cloud providers use anycast extensively. If one anycast node fails, traffic automatically routes to the next nearest node, providing built-in fault tolerance without client-side changes.

Related Terms

NAT (Network Address Translation)
A method of mapping private IP addresses to public IP addresses, allowing multiple devices to share a single public IP.
SNMP (Simple Network Management Protocol)
A protocol for monitoring and managing network devices like routers, switches, servers, and printers remotely.
TCP vs UDP
Two transport layer protocols: TCP provides reliable, ordered delivery while UDP provides fast, connectionless delivery without guarantees.
DHCP
A protocol that automatically assigns IP addresses and network configuration to devices on a network.
Traceroute
A network diagnostic tool that shows the path packets take from source to destination, listing each hop along the way.
DNS (Domain Name System)
A hierarchical naming system that translates human-readable domain names into IP addresses.
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