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Juniper JN0-664 Exam Questions
- Topic 1: OSPF: In this topic, Juniper networking professionals delve into the core concepts and operations of OSPFv2 and OSPFv3. The focus is on configuring and monitoring single-area and multi-area OSPF scenarios. This ensures proficiency in managing link-state routing protocols and enhancing network efficiency. Understanding OSPF prepares the audience to address challenges in service provider environments effectively.
- Topic 2: IS-IS: This topic provides an in-depth exploration of the Intermediate System to Intermediate System (IS-IS) protocol, focusing on its operation and concepts. Juniper networking professionals learn how to configure and monitor single-area and multi-area IS-IS, equipping them with skills essential for maintaining scalable and robust routing infrastructures in large networks.
- Topic 3: BGP: The concepts, operation, and functionality of Border Gateway Protocol (BGP) form the crux of this topic. Juniper networking professionals gain insights into BGP scaling mechanisms and develop expertise in configuring and monitoring BGP in complex scenarios. Mastery of BGP is vital for optimizing route distribution and achieving efficient inter-domain routing.
- Topic 4: Class of Service (CoS): This topic emphasizes the principles of Junos OS Class of Service (CoS). Juniper networking professionals learn to configure and monitor CoS for efficient traffic prioritization. This ensures service quality by managing bandwidth, latency, and packet loss, a critical aspect of service provider network optimization.
- Topic 5: IP Multicast: Aspiring Juniper networking professionals explore the concepts and operations of IP multicast, including IGMP, PIM dense mode, and PIM sparse mode (including SSM). The topic focuses on configuration and monitoring techniques, enabling efficient delivery of multicast traffic across the network while optimizing resource utilization.
- Topic 6: Layer 3 VPNs: This topic covers the concepts and operation of Layer 3 VPNs, including their configuration and monitoring. Juniper networking professionals also explore Junos OS support for carrier-of-carriers and inter-provider VPN models. These skills are crucial for managing secure, scalable, and interconnected multi-tenant network environments.
- Topic 7: Layer 2 VPNs: Juniper networking professionals gain comprehensive knowledge of Layer 2 VPNs, including BGP Layer 2 VPNs, LDP Layer 2 circuits, VPLS, and EVPN. This topic focuses on configuring, monitoring, and troubleshooting Layer 2 VPNs, ensuring expertise in providing efficient and seamless layer 2 connectivity across service provider networks.
Free Juniper JN0-664 Exam Actual Questions
Note: Premium Questions for JN0-664 were last updated On Jun. 04, 2025 (see below)
In IS-IS, which two statements are correct about the designated intermediate system (DIS) on a multi-access network segment? (Choose two)
Option A (Correct):
In IS-IS, theDesignated Intermediate System (DIS)is elected based on thehighest configured priority(as defined in Junos OS).
If priorities are equal, the router with thehighest MAC addressbecomes the DIS.
A priority value of10will always override a lower priority (e.g., 1).
Option C (Correct):
On a multi-access network (e.g., Ethernet),all IS-IS routers form adjacencies with every other routeron the segment.
Unlike OSPF, IS-IS does not restrict adjacencies to only the DIS.
The DIS is responsible for creating apseudonode LSPto represent the broadcast network, but full mesh adjacencies are maintained.
Why Other Options Are Incorrect:
Option B:Incorrect. Higher priority always wins the DIS election. A priority of 1 cannot override a priority of 10.
Option D:Incorrect. IS-IS routers form adjacencies withall neighbors, not just the DIS.
Key Takeaways:
DIS Election:Prioritizes highest numerical value (e.g., 10 > 1).
Adjacency Behavior:Full mesh adjacencies are maintained, unlike OSPF.
DIS Role:Primarily for generating pseudonode LSPs and optimizing flooding, not adjacency restriction.
Exhibit
Referring to the exhibit, PIM-SM is configured on all routers, and Anycast-RP with Anycast-PIM is used for the discovery mechanism on RP1 and RP2. The interface metric values are shown for the OSPF area.
In this scenario, which two statements are correct about which RP is used? (Choose two.)
Exhibit
Referring to the exhibit, you are receiving the 192.168 0 0/16 route on both R3 and R4 from your EBGP neighbor You must ensure that R1 and R2 receive both BGP routes from the route reflector
In this scenario, which BGP feature should you configure to accomplish this behavior?
By default, which statement is correct about OSPF summary LSAs?
OSPF uses different types of LSAs to describe different aspects of the network topology. Type 1 LSAs are also known as router LSAs, and they describe the links and interfaces of a router within an area. Type 3 LSAs are also known as summary LSAs, and they describe routes to networks outside an area but within the same autonomous system (AS). By default, OSPF will summarize routes from Type 1 LSAs into Type 3 LSAs when advertising them across area boundaries .
Click the Exhibit button.
Referring to the exhibit, which statement is correct?
The exhibit shows the configuration of a VRF (Virtual Routing and Forwarding) instance on a Juniper PE router. Let's break down the key components:
VRF Configuration (VPN-A)
The instance type is VRF, meaning this is an L3VPN (Layer 3 VPN).
The routing instance contains a static route (10.1.0.0/16 next-hop 10.1.0.1).
The interface ge-0/0/2.0 is assigned to the VRF.
Route Distinguisher (RD): 172.17.20.1:1
VRF-Export Policy: vpn-a-export
VRF-Target: target:65512:1 (This defines which routes will be imported into the VRF).
VRF Export Policy (vpn-a-export)
The vpn-a-export policy adds two BGP communities (route targets) to exported VPN routes:
community add vpn-a-target;
community add vpn-m-target;
accept;
The vpn-a-target community corresponds to target:65512:1.
The vpn-m-target community corresponds to target:65512:2.
Policy-Options (Community Definitions)
community vpn-a-target members target:65512:1;
community vpn-m-target members target:65512:2;
This confirms that routes exported from this VRF will have BOTH target:65512:1 and target:65512:2.
Evaluating the Answer Choices
Option A: 'VPN routes are exported with the target:65512:1 and target:65512:2 route targets.'
The vpn-a-export policy explicitly adds both vpn-a-target (65512:1) and vpn-m-target (65512:2) to exported routes.
This is correct.
Option B: 'You cannot use the vrf-target and vrf-export statements in the same VRF.'
This is incorrect.
Juniper allows the use of both vrf-target and vrf-export in the same VRF:
vrf-target is used for importing routes.
vrf-export defines export policies (which can add additional route targets).
This is incorrect.
Option C: 'VPN routes with the target:65512:1 and target:65512:2 route targets are imported.'
The vrf-target target:65512:1; statement only controls importing routes.
The import policy does not include target:65512:2, so routes tagged with target:65512:2 alone would not be imported into this VRF.
This is incorrect.
Option D: 'VPN routes are exported with only the target:65512:1 route target.'
The export policy (vpn-a-export) clearly adds both 65512:1 and 65512:2.
This is incorrect.
Final Answer:
A. VPN routes are exported with the target:65512:1 and target:65512:2 route targets.
Verification from Juniper Documentation
Juniper MPLS L3VPN Configuration Guide confirms that vrf-target is used for importing, while vrf-export can be used for exporting multiple route targets.
Juniper Routing Policy Documentation states that export policies can add multiple BGP communities (route targets).
RFC 4364 (BGP/MPLS IP VPNs) defines the use of route targets for VPN route control.
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