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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

Subnet
A logical division of an IP network into smaller segments to improve performance, security, and management.
Network Monitoring
The practice of continuously observing network infrastructure to detect failures, performance degradation, and security threats.
OSI Model
The seven-layer Open Systems Interconnection model that standardizes network communication functions from physical transmission to application protocols.
DNS Record Types
Different types of DNS entries that map domain names to various information like IP addresses, mail servers, and verification strings.
Reverse Proxy
A server that sits between clients and backend servers, forwarding client requests and returning server responses on their behalf.
SNMP (Simple Network Management Protocol)
A protocol for monitoring and managing network devices like routers, switches, servers, and printers remotely.
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