Refer to the exhibit. What three statements are true about the IS-IS configuration? (Choose
three.)
A.
The router is in area 49.0001.0002.
B.
The router acts as a Level 1-2 router.
C.
CLNS routing is enabled for the router.
D.
The router has a system ID of 0003.0004.
E.
The interfaces have a functional IS-IS configuration.
F.
The network service access point selector (NSEL) byte has a value of 0.
Explanation:
This router is using the default settings, which is a Level 1-2 router. The “ip router isis”
command is the only IS-IS command needed for an interface.
The area is 49.001A. The router’s system ID is 0002.0003.0004. The easiest way to figure
this out is to start from the right and work towards the left. The last two numbers of the NET
are the NSEL; they are always 00 on a router. The next 12 numbers (separated into 3
groups of 4 numbers) are the system ID. On Cisco routers, the system ID is always this
length—6 bytes. Anything to the left of the system ID is the area ID.
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