Which statement is true about IS-IS?
A . IS-IS level 1 internal routes are announced to level 2 by default.
B . All IS-IS level 1 routes are announced to level 2 by default.
C . IS-IS level 2 internal routes are announced to level 1 by default.
D . IS-IS does not share routes between level 1 and level 2 by default.
Answer: A