An Internet Exchange Point (IXP) is a facility where multiple networks connect directly to exchange traffic more efficiently. Instead of sending every packet through a third-party transit provider, networks can peer at the exchange and keep local traffic local. Some IXPs also host shared services, such as caching, route servers, or timing-related infrastructure, for connected participants.
In cyber security, IXPs matter because they sit at a high-value junction in network traffic flows. If an IXP is misconfigured, poorly segmented, or attacked, the impact can spread across many connected networks at once. Defenders use IXPs to reduce latency, improve resilience, and localize services, but they must secure access control, routing policy, and any hosted services carefully. In timing architectures, an IXP may help distribute trusted time locally, but only when the trust chain, authentication, and failover design are sound.