A large OSPF network experiences frequent but isolated link failures. The network operator notices high CPU usage on all routers during these events. The operator wants to reduce CPU usage without sacrificing convergence speed for the first failure. Which configuration approach best achieves this?

Enable iSPF and configure SPF throttling with a short initial delay and exponential backoff

Enable iSPF but disable SPF throttling

Disable iSPF and rely on SPF throttling only

Increase the OSPF dead interval to reduce neighbor flapping

In which scenario is Incremental SPF most beneficial?

When the OSPF process is first started on a router

When a new router is added to the network with many new links

When a single link fails and only a small portion of the network is affected

When the network is stable and no changes occur

A network engineer is explaining OSPF's behavior to a junior colleague. The engineer states that the SPF algorithm builds a tree from the router's perspective. What is the primary purpose of this tree?

To determine the least-cost path to every destination in the area

To identify all possible paths and select the most reliable one

To create a backup path for every destination in case of failure

To summarize routes before advertising them to other areas

How does the SPF algorithm inherently prevent routing loops?

By running a separate loop-detection protocol after SPF completes

By flooding LSAs only to directly connected neighbors

By requiring all routers to use the same router ID

By ensuring each node appears only once in the tree with a single predecessor

Juniper NetworksCertified Professional, Service Provider Routing and Switching (JNCIP-SP)

Domain 1Objective 5

SPF Algorithm JN0-664 Practice Questions (Page 3)

Part of the OSPF domain, which makes up ~19% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~7–11 in this domain), expect 1–1 from this objective — we provide 28 practice questions to prepare you well beyond it. (estimate)

28questions here

6free pages

10concepts

Questions 11–15

11foundation · easy
Which OSPF configuration parameter controls the maximum number of equal-cost paths that can be installed in the routing table?
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12expert · hard
A large OSPF network experiences frequent but isolated link failures. The network operator notices high CPU usage on all routers during these events. The operator wants to reduce CPU usage without sacrificing convergence speed for the first failure. Which configuration approach best achieves this?
Select an answer first
13foundation · easy
In which scenario is Incremental SPF most beneficial?
Select an answer first
14application · medium
A network engineer is explaining OSPF's behavior to a junior colleague. The engineer states that the SPF algorithm builds a tree from the router's perspective. What is the primary purpose of this tree?
Select an answer first
15foundation · easy
How does the SPF algorithm inherently prevent routing loops?
Select an answer first

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