Refer to the exhibit. An engineer has configured all routers in the environment to run IS-IS Level 1 and Level 2 routing. The engineer wants traffic from R1 to R5 to pass via R2. but IS-IS routing…

Question

Options

• AConfigure routers R1, R4, and R5 for Level 2 routing only.
• BSet the link metric for the link from router R1 to router R4 to 30 or more.
• CSet the link metric on R2 for the links from router R2 to routers R3 and R4 to 30 or more.
• DConfigure routers R1, R2, and R5 for Level 1 routing only.

• A
  7% (2)
• B
  79% (23)
• C
  3% (1)
• D
  10% (3)

Explanation

IS-IS selects the lowest-cost path based on link metrics. If the R1-to-R4 path currently has a lower total metric than the R1-R2 path, IS-IS will prefer the R4 path. To redirect traffic through R2, the most targeted and non-disruptive fix is to increase the metric on the R1-R4 link to 30 or more, making that path more expensive than the R1-R2 path. A is incorrect: changing Level types on R1, R4, and R5 would affect routing scope and domain boundaries, which is a drastic change not needed here. C is incorrect: changing metrics on R2's outbound links would affect traffic going from R2 toward R3/R4, not from R1 toward R2. D is incorrect: configuring Level 1 only on R1, R2, and R5 would limit their routing scope to the local area and could break connectivity to routers in other areas.

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