A network design engineer has been asked to reduce the size of the SPT on an IS-IS broadcast network. Which option should the engineer recommend to accomplish this task?

The correct answer is D. Configure the links as point-to-point. On an IS-IS broadcast network (e.g., Ethernet), the protocol elects a Designated Intermediate System (DIS) and creates a pseudonode to represent the broadcast segment in the Shortest Path Tree (SPT). This pseudonode adds entries to the LSDB and increases the SPT size and…

Advanced Addressing and Routing Solutions

Question

Options

AConfigure the links as point-to-multipoint.
BConfigure QoS in all links.
CConfigure a new NET address.
DConfigure the links as point-to-point.

How the community answered

(25 responses)

A
4% (1)
B
8% (2)
C
16% (4)
D
72% (18)

Explanation

On an IS-IS broadcast network (e.g., Ethernet), the protocol elects a Designated Intermediate System (DIS) and creates a pseudonode to represent the broadcast segment in the Shortest Path Tree (SPT). This pseudonode adds entries to the LSDB and increases the SPT size and complexity. By configuring the links as point-to-point (using the 'isis network point-to-point' command), the DIS election is eliminated and no pseudonode is created, directly reducing the SPT size and speeding up convergence. Option A (point-to-multipoint) is not a valid IS-IS network type. Option B (QoS) affects traffic prioritization, not topology. Option C (new NET address) changes the router's identity, not the SPT structure.

Topics

#IS-IS#SPT optimization#broadcast network#point-to-point links

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