R1 contains the configuration shown in the figure. isis 1 net-style wide network-entity 49.0022.ee8c.a0c2.baf2.00 Which option is correct for the following description of IS-IS process 1?

Question

Options

• AThe device type of R1 is Level-1.
• BThe device type of R1 is Level-2.
• CThe device type of R1 is Level-1-2.
• DThe device type of R1 cannot be determined

• A
  7% (3)
• B
  2% (1)
• C
  78% (36)
• D
  13% (6)

Explanation

Option C is correct because when no explicit IS-IS level is configured (no is-level or is-type command appears in the configuration), Huawei routers default to Level-1-2, meaning the router participates in both Level-1 (intra-area) and Level-2 (inter-area) routing. The absence of a level command is itself meaningful information - the default behavior determines the device type.

Options A and B are wrong because Level-1-only or Level-2-only operation must be explicitly configured; neither is the default. Option D is wrong because the device type can be determined - the default IS-IS behavior is well-defined and unambiguous even when no level command appears.

Memory tip: Think of IS-IS Level-1-2 as the "out-of-the-box" setting - a new IS-IS process does the most work by default. If you see no level command, always assume Level-1-2 on Huawei devices.

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