CCIE

OSPF gives you four different ways to stop a prefix from getting somewhere, and they are not interchangeable. Two of

Here is a routing puzzle. An OSPF router has a route to an external network. The route is in the

You need to reload a core router. It is carrying live traffic. The naive approach - just reload it - drops every

Look at your routing table and count how many of those prefixes anyone actually sends traffic to. In a typical

OSPF converges fast. That is its whole reason for existing. But "fast" is a tuning decision, and the

The CCIE troubleshooting section does not ask you to explain BGP. It hands you a broken network and a clock.