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Exam 300-420 topic 1 question 47 discussion

Actual exam question from Cisco's 300-420
Question #: 47
Topic #: 1
[All 300-420 Questions]

A network engineer must segregate three interconnected campus networks using IS-IS routing. A two-layer hierarchy must be used to support large routing domains and to avoid more specific routes from each campus network being advertised to other campus network routers automatically. Which two actions does the engineer take to accomplish this segregation? (Choose two.)

  • A. Designate two IS-IS routers as BDR routers at the edge of each campus, and configure one BDR for all Level 1 routers and one BDR for all Level 2 routers.
  • B. Designate two IS-IS routers from each campus to act as Level 1/Level 2 backbone routers at the edge of each campus network.
  • C. Assign the same IS-IS NET value for each campus, and configure internal campus routers with Level 1/Level 2 routing.
  • D. Utilize different MTU values for each campus network segment. Level 2 backbone routers must utilize a larger MTU size of 9216.
  • E. Assign a unique IS-IS NET value for each campus, and configure internal campus routers with Level 1 routing.
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Suggested Answer: BE 🗳️
by akbntc at Sept. 5, 2023, 3:04 a.m.

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neiker45
5 days, 9 hours ago
A. Remember that level 2 is necessary for inter-area communication so both should be level 1/2. Wrong. B. The routers having two levels allows them to communicate intra and inter area, passing packets as necessary. Correct C. The NET value is unique and cannot be the same. Plus, having internal routers handling level 1/2 is not efficient as they use 2 different tables. The level 2 won't be used. Wrong. D. MTU in this situation has nothing to do with the prompt. Wrong E. Internal routers use level 1 and unique NET IDs. Correct
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akbntc
3 months, 1 week ago
B & E are correct.
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