Refer to the Exhibit.
R2 is announcing the 10.200/16 network to its IS-IS neighbors. No routing policies have been
applied to R3. Referring to the exhibit, will R5 have 10.200/16 as an IS-IS route?
A.
Yes; IS-IS level 2 externals are passed from level 2 to level 1 by default.
B.
No; IS-IS level 2 externals are only passed to level 1 if wide-metrics-only is configured on all
routers.
C.
Yes; all level 2 routing information is shared throughout an IS-IS domain by default.
D.
No; IS-IS does not announce routes from level 2 to level 1 unless a routing policy is applied.
Explanation:
Level 2 (backbone) link-state PDUs are normally not flooded into a Level 1 area.
An IS-IS Level 2 area is analogous to the OSPF backbone area (0), while a Level 1 area operates much like an OSPF totally stubby area.