Based on the output shown in the exhibit, what does up signify?
A.
Prefixes are up if the interface on the local router toward the destination is functioning correctly.
B.
Prefixes are up if their unfragmented-packets value is flagged in the LSP.
C.
Prefixes are up if their LSP has not crossed an area boundary from level 2 to level 1.
D.
Prefixes are up if their unusable-path value is flagged in the LSP.
Answer C is correct
Prefixes are up if their LSP has not crossed an area boundary from level 2 to level 1.
Check JNCIS study guide from link below and go to PDF page 179 (208 of 868)
https://www.juniper.net/us/en/training/certification/JNCIS_studyguide.pdf
Using the sample network in Figure 3.2, we examine the link-state PDU advertised by the
Riesling router:
user@Riesling> show isis database Riesling.00-00 extensive | find TLV
TLVs:
Area address: 49.0001 (3)
Speaks: IP
Speaks: IPv6
IP router id: 192.168.1.1
IP address: 192.168.1.1
Hostname: Riesling
IS neighbor: Merlot.02, Internal, Metric: default 10
IS extended neighbor: Merlot.02, Metric: default 10
IP address: 192.168.10.1
IP prefix: 192.168.10.0/24, Internal, Metric: default 10, Up
IP prefix: 192.168.1.1/32, Internal, Metric: default 0, Up
IP extended prefix: 192.168.10.0/24 metric 10 up
IP extended prefix: 192.168.1.1/32 metric 0 up
No queued transmissions
Riesling is advertising both its local loopback address and the segment connecting it to Merlot.
These fields are marked with the IP prefix: notation in the router’s output. The I/E bit
is currently set to a 0 value as seen by the Internal notation. In addition, the Up notation signifies
that this address can be advertised to other Level 2 areas but not into a Level 1 area
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