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Exam 350-501 topic 1 question 268 discussion

Actual exam question from Cisco's 350-501
Question #: 268
Topic #: 1
[All 350-501 Questions]


Refer to the exhibit. A network engineer notices PE-21 convergence degradation due to the growing LSDB size of Level 2 areas in the network. The engineer decides to migrate router PE-21 from an inter-area design to an intra-area implementation. Inter-area routing must be accomplished via an ATT-bit set by the
Level 1/Level 2 router. Which configuration must the engineer implement on PE-21 to complete the migration?

  • A. configure terminal router isis 1 no net 49.0200 net 49.5000 is-type level-1-2 end
  • B. configure terminal router isis 1 net 49.5000.0100.1202.0021.00 is-type level-1-2 end
  • C. configure terminal router isis 1 net 49.5000.0100.1222.0022.00 is-type level-1 end
  • D. configure terminal router isis 1 no net 49.0200.0100.1202.0021.00 net 49.5000.0100.1202.0021.00 is-type level-1 end
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Suggested Answer: D 🗳️
by thejag at March 3, 2023, 11:16 a.m.

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thejag
2 years, 2 months ago
Answer is D " In order to reach Level 2 area, L1L2 router sets the Attach bit in Level1 LSP. Level1 router installs the default route in routing table, this route would point towards L1L2 router." https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/200472-Configure-the-Attach-bit-set.html
upvoted 2 times
thejag
2 years, 1 month ago
After another look, I'm not sure about this?
upvoted 1 times
thejag
2 years, 1 month ago
D is correct. Router has to be changed to L1 and the net changed to area 49.5000... AFTER removing the old net
upvoted 3 times
cocopost
10 months, 2 weeks ago
Agree, but the cloud underneath PE-21 is shown as L2. Since PE21 is now changed to L1 with a different area, it wont connect to its own cloud. Then the Cloud has to change to L1 also. This is ok, but it would be a real pain for some poor network administrator!
upvoted 1 times
cocopost
10 months, 2 weeks ago
I should have said the cloud needs to change to L1/L2 so that it can connect to PE-21, or else PE-21 should have been left as L1/L2
upvoted 1 times
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