Intermediate s来自ystem to intermediate system (IS - IS)...

Intermediate system to intermediate system (IS - IS), is a protocol used by network devices (routers) to determine the best way to forward datagrams through a packet - switched network, a process called routing. Which three attributes are of the IS - IS routing protocol? （）A、supports VLSM link - state routing protocol operati on is similar to BP supports two routing levels within an autonomous system