H12-821_V1.0 Exam Dumps | An enterprise uses Huawei routers to deploy an IS-IS network for network-wide communication. An engineer

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Question 98/107

An enterprise uses Huawei routers to deploy an IS-IS network for network-wide communication. An engineer wants to change the interface cost to control route selection. By default, which of the following values is the maximum cost that can be configured?

A. 67

B. 63

C. 64

D. 68

Correct Answer: B

Comprehensive and Detailed in-depth Step-by-Step Explanation:In IS-IS, the interface cost is a metric used to determine the best path to a destination. Lower-cost paths are preferred over higher-cost paths. By default, IS-IS interface costs can range from 1 to 63.
* Default Cost Range:
* IS-IS allows the configuration of interface costs within the range of 1-63 by default. This range is sufficient for most networks.
* Maximum Configurable Cost:
* The maximum value that can be configured by default is 63. If there is a requirement for a higher cost range, the metric-style can be changed to wide, which allows the cost range to extend beyond 63.
* Option A (67): Incorrect. 67 is not the maximum default value.
* Option B (63): Correct. This is the maximum default cost value.
* Option C (64): Incorrect. This is beyond the default range.
* Option D (68): Incorrect. This is beyond the default range.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "IS-IS Cost and Route Selection".
* RFC 5308 - Routing IPv6 with IS-IS.

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