Take the official practice tests on Junos Genius. They are the best indicator of the question style and difficulty you will face.
Search the TechLibrary for "Junos OS OSPF configuration" or "MPLS fundamentals" and save those sections as PDFs.
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Implementing IPv6 and GRE/IP-IP tunneling. 3. Avoiding "Brain Dumps"
Use the JN0-664 list as your table of contents. Take the official practice tests on Junos Genius
Concepts of bridging, VLANs, and the Spanning Tree Protocol (STP).
This is Juniper’s official learning platform. By creating a free account, you can access practice exams and "Learning Paths" specifically curated for the JNCIS-SP track. Using dumps devalues your certification and can lead
Fundamentals of label switching, RSVP, LDP, and traffic engineering.
The most reliable source for a "free" study guide isn't a third-party PDF download, but rather the program and the Juniper Genius platform.