𝗪𝗵𝘆 𝗡𝗲𝘁𝘄𝗼𝗿𝗸 𝗟𝗮𝘁𝗲𝗻𝗰𝘆 𝗞𝗶𝗹𝗹𝘀 𝗬𝗼𝘂𝗿 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻

Latency is a silent killer for distributed systems and APIs. A tiny delay at the transport layer causes massive problems at the application layer. This ruins the experience for real-time web tools and AI streaming.

You cannot ignore the physics of the internet.

The Speed of Light Constraint

Data travels through fiber-optic cables on the ocean floor. Light moves slower in glass than in a vacuum. Light in fiber travels at about 204,500 km/s.

If you send data from Tokyo to San Francisco, the distance is roughly 9,000 km. Physics dictates a minimum round-trip time of about 88ms. You cannot beat this limit. Any routing error or congestion adds even more delay.

Anycast vs. Unicast Routing

In a Unicast network, every server has one unique IP address. If a user in London hits a server in New York, the data travels through many unpredictable hops. This causes latency spikes.

Anycast changes this. You assign the same IP address to multiple edge datacenters globally.

• Routers find the shortest path via BGP. • Packets go to the closest physical edge node. • Connection setups happen at the edge, not across oceans.

This moves your network perimeter closer to your users.

The Danger of Packet Loss

Many engineers think 1% packet loss is fine. It is not.

Standard TCP algorithms like Cubic see a single lost packet and panic. They slash the congestion window by 30%. If loss continues, your 1 Gbps fiber link performs like an old dial-up connection.

If packets drop too often, the system hits a Retransmission Timeout. Each timeout doubles the wait time. A small network hiccup can freeze an application for several seconds.

Two Ways to Fix This

Modern teams use these two methods to maintain speed:

  • Google BBR: This algorithm measures actual bandwidth instead of reacting to every lost packet. It keeps throughput stable even during minor congestion.
  • QUIC Protocol: This runs over UDP to stop head-of-line blocking. If one packet drops, other data streams keep moving. This prevents a single loss from stalling your entire session.

Stop treating the internet like a magic cloud. Understand the physical reality of your data.

Source: https://dev.to/taohuawu/demystifying-global-network-latency-the-mechanics-of-anycast-routing-cross-border-fiber-optics-1bpa

Komuniti pembelajaran pilihan: https://t.me/GyaanSetuAi