Who It Is For
This exam fits engineers who already hold JNCIS-SP and can work through provider-network scenarios involving routing policy, BGP scale, traffic treatment, multicast forwarding, and VPN service delivery.
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Exam Code: JN0-664
Exam Name: Service Provider Professional (JNCIP-SP)
Price: $68.00 $58.88
Exam Questions: 96 Q&As
Last Updated: 2026-10-08
Prepare for the JN0-664 Service Provider Routing and Switching, Professional exam with focused practice in advanced Junos routing, Class of Service, IP multicast, and Layer 2 and Layer 3 VPNs.
The JNCIP-SP certification validates your ability to reason through service provider routing and switching designs, configurations, and troubleshooting scenarios—not just recognize protocol names.
About the JN0-664 Exam
JN0-664 is the written exam for experienced networking professionals working with service provider routing and switching on Junos. It tests protocol behavior alongside configuration, monitoring, and troubleshooting decisions. The published objectives cover seven domains; Juniper does not assign public percentage weights to them.
Preparation Focus
Juniper recommends Advanced Junos Service Provider Routing, Junos Layer 2 VPNs, and Junos Layer 3 VPNs training. Hands-on verification is especially useful: compare control-plane information with the route, label, or forwarding state that actually carries traffic.
Skills Measured
The seven headings below follow the published exam objectives. No official domain percentages are listed.
OSPF
Know OSPFv2 and OSPFv3 area behavior, LSA flooding, DR/BDR elections, SPF, metrics, summarization, virtual links, and routing policy. Practice checking why an adjacency or interarea route behaves differently from the design.
IS-IS
Work through Level 1 and Level 2 operation, LSP flooding, DIS election, wide metrics, route summarization, route leaking, and policy. Distinguish within-area visibility from interarea reachability.
BGP
Trace path selection and next-hop resolution before changing policy. The scope also includes attributes, communities, multipath, multihop, damping, FlowSpec, multiprotocol BGP, and route reflection.
Class of Service (CoS)
Map traffic from classification to forwarding class, packet loss priority, scheduling, policing, drop behavior, and rewrite rules. Be clear about whether a feature marks, queues, limits, or discards traffic.
IP Multicast
Review ASM versus SSM, RPF, IGMP, PIM dense and sparse modes, rendezvous points, and multicast routing policy. A useful troubleshooting habit is to verify the upstream RPF path before inspecting downstream receivers.
Layer 3 VPNs
Understand PE/CE control and data paths, VRFs, route distinguishers, route targets, route distribution, topology choices, IPv6 VPNs, MVPNs, scaling, and Internet access models.
Layer 2 VPNs
Compare BGP Layer 2 VPNs, LDP Layer 2 circuits, VPLS, and EVPN. Focus on signaling, labels, MAC learning, multihoming, and the forwarding evidence that separates a control-plane problem from a data-plane problem.
Editor’s Review Notes
Three Decisions Candidates Commonly Mix Up
Do not confuse a route distinguisher with a route target, BGP reachability with usable next-hop resolution, or a multicast group membership issue with an RPF failure. In each scenario, identify whether the missing piece is route identity, import policy, signaling, or forwarding.
Two-Week Review Plan
Days 1–3: OSPF, IS-IS, and routing policy. Days 4–5: BGP selection and route reflection. Days 6–7: CoS and multicast. Days 8–10: Layer 3 VPNs. Days 11–12: Layer 2 VPNs, VPLS, and EVPN. Use the last two days for mixed troubleshooting and timed practice.
Best Use of Lab Time
Build one small topology that you can reuse. Change one condition at a time—such as a BGP route target, an OSPF interface priority, or a multicast upstream path—then compare the routing table, protocol state, and forwarding result. This makes similar-looking exam choices easier to separate.
JN0-664 Sample Questions
These five study questions cover selected published objectives. Question 3 has been rewritten to remove an incorrect default-metric claim from the supplied draft. They are not official Juniper exam questions and do not represent the full 65-question exam.
Question 1: CoS Classification Mechanisms
Which three mechanisms can Junos platforms use to classify incoming traffic for Class of Service? (Choose three.)
Correct answers: B, D, and E
Explanation: BA classifiers use a packet’s CoS markings, fixed classifiers assign a forwarding class independent of those markings, and MF classifiers match multiple packet fields. Platform support and precedence can vary, but all three are ingress classification mechanisms.
Common mistake: Treating any CoS feature as a classifier. Classification determines initial forwarding treatment; shaping and rewriting serve different stages.
Why the other options are wrong: A changes outgoing markings. C controls traffic rate or queue output; neither is one of the three ingress classifier types requested.
Question 2: IS-IS Attached Bit
Level 1 IS-IS routers already receive specific leaked prefixes from Level 1/Level 2 routers. You want the Level 1 routers to use those prefixes without installing the attached-bit default route. Which action meets this requirement?
Correct answer: D
Explanation: On a Level 1 router, ignore-attached-bit prevents installation of the default route signaled by the attached bit. The specific leaked routes can still be considered independently.
Common mistake: Assuming this setting creates or leaks specific routes. It only suppresses the attached-bit default route.
Why the other options are wrong: A applies the setting to the wrong routers. B changes metric support, not default-route installation. C removes the Level 2 role needed for interarea connectivity.
Question 3: OSPF Interarea Summarization
An OSPF area border router has several intra-area prefixes that could fit within one aggregate. No area-range statement is configured. What does Junos do by default when advertising those routes to another area?
Correct answer: C
Explanation: Junos ABRs do not automatically summarize interarea routes. An area-range statement is needed to advertise a configured aggregate in place of matching individual routes.
Common mistake: Assuming that a summary LSA always represents an automatically aggregated prefix, or that an aggregate’s metric defaults to the lowest component metric.
Why the other options are wrong: A confuses interarea advertisements with external Type 5 LSAs. B assumes automatic summarization and an unsupported metric rule. D incorrectly treats area-range as mandatory for interarea advertisement.
Question 4: Interprovider VPN Route Resolution
On a provider edge router, VPN routes received through an interprovider design remain hidden because the remote PE next hop cannot be resolved through labeled routes. BGP family inet labeled-unicast is already configured. Which additional option allows the labeled routes to be used for VPN next-hop resolution?
Correct answer: C
Explanation: resolve-vpn places the labeled routes in inet.3 (or inet6.3), where Junos can use them to resolve a remote PE next hop for VPN route installation.
Common mistake: Focusing on label values or traffic-engineering behavior before checking the routing table used for VPN next-hop resolution.
Why the other options are wrong: A changes label handling, not this route-resolution function. B and D do not place the received BGP labeled route into the VPN resolution table.
Question 5: BA and MF Classifier Order
An ingress interface has both a behavior aggregate (BA) classifier and a multifield (MF) classifier. In what order does Junos apply them?
Correct answer: B
Explanation: Junos applies the BA classifier first and the MF classifier afterward. If their classifications conflict, the MF result takes precedence.
Common mistake: Thinking the first classifier always wins, or confusing classification order with the order in which the features were configured.
Why the other options are wrong: A and C ignore the supported coexistence of BA and MF classification. D reverses the documented processing order.
Frequently Asked Questions
Does JN0-664 require an earlier certification?
Yes. Juniper lists JNCIS-SP as the prerequisite certification for JNCIP-SP.
Are the exam domains assigned percentage weights?
Juniper publishes seven objective headings for JN0-664 but does not list a percentage for each. Avoid study guides that present invented official weights.
Is the exam fee or passing score shown here?
The reviewed exam page does not publicly state either value. Confirm current registration pricing during Pearson VUE checkout; do not assume a practice-test score equals the passing standard.
How should I check whether practice material is current?
Match the exam code, all seven objective headings, the listed Junos OS version, and the 65-question format against the current exam listing before purchase.
Can I preview a PDF before buying?
Check the product listing for a downloadable sample or request one. Look for readable topology descriptions, unambiguous answer keys, and explanations that distinguish similar protocol features.
Does a question package include labs, training, or an exam voucher?
Only if the selected listing explicitly says so. Practice questions, Juniper training, lab access, and exam registration are separate offerings.
Will the test software run on my device?
Confirm operating-system support, browser requirements, activation limits, and offline access for the specific PDF or testing-engine option before checkout.
What are the update and refund terms?
Review the published terms before downloading or activating the product. Check the update period, refund deadline, access restrictions, and support process for technical issues.
Practice the Decisions Behind Provider Networks
Work from protocol state to route selection and forwarding outcome, then use each missed question to guide a focused lab exercise.
Disclaimer
CertQuestionsBank is an independent exam-preparation provider and is not affiliated with, endorsed by, or authorized by HPE Juniper Networking. Exam details and objectives can change. Verify current JN0-664 information before registering. Juniper, Junos, and related marks belong to their respective owners.
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