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Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) certification exam is a professional-level certification exam that is designed to validate the skills and knowledge of professionals who work with Juniper Networks technologies in service provider environments. JN0-664 Exam is designed to test the skills required to configure, troubleshoot, and maintain Juniper Networks equipment in service provider environments, including advanced routing and switching, MPLS, Layer 2 and Layer 3 VPNs, and more.
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NEW QUESTION # 36
Which two statements describe PIM-SM? (Choose two)
Answer: C,D
Explanation:
PIM sparse mode (PIM-SM) is a multicast routing protocol that uses a pull model to deliver multicast traffic.
In PIM-SM, routers with receivers send join messages to their upstream neighbors toward a rendezvous point (RP) or a source-specific tree (SPT). The RP or SPT acts as the root of a shared distribution tree for a multicast group. Traffic is only forwarded to routers that request to join the distribution tree by sending join messages.
PIM-SM does not flood traffic to all routers or prune routers without receivers, as PIM dense mode does.
NEW QUESTION # 37
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.)
Answer: B,C
Explanation:
A sham link is a logical link between two PE routers that belong to the same OSPF area but are connected through an L3VPN. A sham link makes the PE routers appear as if they are directly connected, and prevents OSPF from preferring an intra-area back door link over the VPN backbone. A sham link creates an OSPF multihop neighborship between the PE routers using TCP port 646. The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes, which allows OSPF to use the correct metric for route selection1.
NEW QUESTION # 38
Refer to the exhibit.
Click the Exhibit button.
After adding Customer C to your Layer 3 VPN, you must ensure that PE2 is receiving VPN routes for all customers attached to PE1, as shown in the exhibit.
Which operational command displays this information?
Answer: B
Explanation:
Understanding the Exhibit and the Problem Statement
The diagram shows a Layer 3 VPN (L3VPN) setup where multiple customers (Customer A, B, and C) are connected across a service provider network using PE (Provider Edge) routers.
PE1 and PE2 exchange VPN routes for all customers using BGP/MPLS Layer 3 VPN (L3VPN) routing.
The question asks how to verify if PE2 is receiving VPN routes for Customer C.
Evaluating the Answer Choices
✅ B. show route table bgp.l3vpn.0 (Correct Answer)
Why?
This command shows all VPN routes stored in the BGP Layer 3 VPN table (bgp.l3vpn.0).
Since PE routers exchange VPN routes using MP-BGP, this table contains the VPN-IPv4 or VPN-IPv6 routes for all customers.
If PE2 is receiving routes from PE1 for Customer C, they will appear in bgp.l3vpn.0.
❌ A. show route table inet.0 (Incorrect)
Why?
The inet.0 table contains global unicast routes for the service provider's network.
VPN routes do not appear here because they are stored in VRF-specific tables.
This command won't help verify VPN route exchange between PE1 and PE2.
❌ C. show route table customer-c.inet.0 (Incorrect)
Why?
The table customer-c.inet.0 represents the VRF routing table for Customer C on the local PE.
It only shows locally installed routes for Customer C but does not confirm if PE2 is receiving routes from PE1.
This command is useful to check local VPN routing but not BGP route propagation.
❌ D. show route summary (Incorrect)
Why?
This command only provides a summary of route counts per protocol (BGP, OSPF, etc.).
It does not display specific VPN routes.
It is useful for general troubleshooting but doesn't confirm VPN route receipt.
Final answer: ✅ show route table bgp.l3vpn.0 (Option B)
Official Juniper Documentation Reference
Junos MPLS VPNs Configuration Guide
Juniper Documentation
"The show route table bgp.l3vpn.0 command displays all VPN-IPv4 routes learned via MP-BGP for Layer 3 VPNs."
NEW QUESTION # 39
In IS-IS, which two statements are correct about the designated intermediate system (DIS) on a multi-access network segment? (Choose two)
Answer: A,B
Explanation:
Option A (Correct):
In IS-IS, the Designated Intermediate System (DIS) is elected based on the highest configured priority (as defined in Junos OS).
If priorities are equal, the router with the highest MAC address becomes the DIS.
A priority value of 10 will always override a lower priority (e.g., 1).
Reference:
Option C (Correct):
On a multi-access network (e.g., Ethernet), all IS-IS routers form adjacencies with every other router on the segment.
Unlike OSPF, IS-IS does not restrict adjacencies to only the DIS.
The DIS is responsible for creating a pseudonode LSP to 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 with all 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.
For further details, refer to Juniper's official IS-IS documentation:
Juniper IS-IS Configuration Guide.
https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/concept/routing-protocol-is-is-security-designated-router-understanding.html
NEW QUESTION # 40
CE-1 must advertise ten subnets to PE-1 using BGP. Once CE-1 starts advertising the subnets to PE-1, the BGP peering state changes to Active.
Referring to the CLI output shown in the exhibit, which statement is correct?
Answer: C
NEW QUESTION # 41
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