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Juniper JN0-664 Certification Exam is designed for professionals who want to validate their skills and knowledge in the field of service provider networking. Service Provider, Professional (JNCIP-SP) certification exam is a part of the Juniper Networks Certification Program, and passing it is a crucial step for those who want to advance their careers in service provider networking.

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The JN0-664 exam covers a wide range of topics, including OSPF, IS-IS, BGP, MPLS, Layer 3 VPNs, Layer 2 VPNs, Class of Service, and IP multicast. JN0-664 exam consists of 65 multiple-choice questions that need to be completed within 120 minutes. JN0-664 Exam is computer-based, and the passing score is 65%. Candidates who pass the JN0-664 exam will be awarded the Juniper Networks Certified Professional Service Provider (JNCIP-SP) certification.

Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q20-Q25):

NEW QUESTION # 20
In IS-IS, which two statements are correct about the designated intermediate system (DIS) on a multi-access network segment? (Choose two)

A. A router with a priority of 1 wins the DIS election over a router with a priority of 10.
B. A router with a priority of 10 wins the DIS election over a router with a priority of 1.
C. On the multi-access network, each router forms an adjacency to every other router on the segment
D. On the multi-access network, each router only forms an adjacency to the DIS.

Answer: B,D

Explanation:
Explanation
In IS-IS, a designated intermediate system (DIS) is a router that is elected on a multi-access network segment (such as Ethernet) to perform some functions on behalf of other routers on the same segment. A DIS is responsible for sending network link-state advertisements (LSPs), which describe all the routers attached to the network. These LSPs are flooded throughout a single area. A DIS also generates pseudonode LSPs, which represent the multi-access network as a single node in the link-state database. A DIS election is based on the priority value configured on each router's interface connected to the multi-access network. The priority value ranges from 0 to 127, with higher values indicating higher priority. The router with the highest priority becomes the DIS for the area (Level 1, Level 2, or both). If routers have the same priority, then the router with the highest MAC address is elected as the DIS. By default, routers have a priority value of 64. On a multi-access network, each router only forms an adjacency to the DIS, not to every other router on the segment. This reduces the amount of hello packets and LSP

NEW QUESTION # 21
Exhibit

Which two statements about the configuration shown in the exhibit are correct? (Choose two.)

A. A Layer 2 VPN is configured.
B. This VPN connects customer sites that use different AS numbers.
C. This VPN connects customer sites that use the same AS number
D. A Layer 3 VPN is configured.

Answer: C,D

Explanation:
The provided configuration is for a routing instance named VPN-A on a Juniper PE (Provider Edge) router. Let's break it down:
Instance Type: VRF
The instance-type vrf; statement indicates that this is a Layer 3 VPN (L3VPN) using MPLS VPNs (RFC 4364 - BGP/MPLS IP VPNs).
This confirms that Option D (A Layer 3 VPN is configured) is correct ✅.
VRF Target and Interface Association
The vrf-target target:64512:1234; defines the route target (RT) for importing and exporting VPN routes.
The interface ge-0/0/1.0; binds this interface to the VRF.
BGP Configuration for CE (Customer Edge) Peering
The group CE section configures external BGP (EBGP) (type external;).
The neighbor 10.0.0.1 is in AS 64512 (peer-as 64512;).
The as-override; statement is used.
Evaluating the Answer Choices
✅ Option B: "This VPN connects customer sites that use the same AS number." The as-override; command allows multiple customer sites that use the same AS number (64512) to communicate over the service provider's MPLS network.
Normally, BGP prevents routes with the same AS in the AS_PATH from being accepted. The as-override feature replaces the customer's AS number with the provider's AS, ensuring proper route advertisement.
✅ This statement is correct.
❌ Option A: "This VPN connects customer sites that use different AS numbers." If the customer sites had different AS numbers, there would be no need for as-override.
The as-override feature is specifically used when all customer sites share the same AS number, ensuring that BGP routes are accepted.
❌ This statement is incorrect.
❌ Option C: "A Layer 2 VPN is configured."
A Layer 2 VPN (L2VPN) configuration would typically use instance-type l2vpn; or EVPN/VPLS-related parameters (e.g., protocols l2vpn or protocols vpls).
Since this configuration uses instance-type vrf; and BGP with a VRF target, it is clearly a Layer 3 VPN (L3VPN).
❌ This statement is incorrect.
✅ Option D: "A Layer 3 VPN is configured."
The instance-type vrf; confirms this is an MPLS Layer 3 VPN (L3VPN).
VRFs, BGP, and route targets (vrf-target) are specific to Layer 3 VPNs.
✅ This statement is correct.
Final answer:
✅ B. This VPN connects customer sites that use the same AS number.
✅ D. A Layer 3 VPN is configured.
Verification from Juniper Documentation:
Juniper BGP/MPLS Layer 3 VPNs Guide confirms that instance-type vrf is used for L3VPNs.
Juniper BGP Configuration Guide states that as-override is applied when customer sites use the same AS number.
RFC 4364 (BGP/MPLS IP VPNs) explains how route targets and VRFs are used in L3VPN deployments.

NEW QUESTION # 22
Refer to the Exhibit:

A network designer would like to advertise a single summary route from R4 to IS-IS level 2 neighbors as shown in the exhibit, but the configuration is not working.
Which three configuration changes will accomplish this task? (Choose three.)

A. delete policy-options policy-statement summary-v6 term DC-routes from route-filter 2001:db5:a:fa00::/61 longer
B. delete protocols isis export summary-v6
C. set protocols isis import summary-v6
D. set policy-options policy-statement summary-v6 term DC-routes from route-filter 2001:dbS:a:fa00::/6l exact
E. set policy-options policy-statement summary-v6 term suppress then reject

Answer: A,D,E

NEW QUESTION # 23

Click the Exhibit button.
Referring to the exhibit, you must provide VRF Internet access over a single connection for VPN-A Site 1, which connects to PE-1.
Which two statements are correct in this scenario? (Choose two.)

A. You must use the RIB group to move interface routes from the inet . 0 table to the VPN-A. inet. 0 table.
B. You must use the RIB group to move a default route, which is learned through BGP, from the inet. o table to the VPN-A. inet. 0 table.
C. You do not need to use the RIB group default route, which is learned through BGP, from the inet. o table to the VPN-A. inet. 0 table.
D. You do not need to use the RIB group to move interface routes from the inet. o table to the VPN-A.
inet. 0 table.

Answer: B,D

Explanation:
In the provided exhibit, the configuration involves using a RIB (Routing Information Base) group to facilitate internet access for VPN-A Site 1 through PE-1. The goal is to provide VRF Internet access over a single connection.
1. **Understanding RIB Groups**:
- RIB groups allow for the import and export of routes between different routing tables.
- In this scenario, we have two RIBs: `inet.0` (the main routing table) and `VPN-A.inet.0` (the VRF-specific routing table).
2. **Statement Analysis**:
- **A. You must use the RIB group to move a default route, which is learned through BGP, from the inet.0 table to the VPN-A.inet.0 table.**
- Correct. To provide Internet access to VPN-A, the default route (0.0.0.0/0) learned via BGP in the `inet.0` table must be made available in the `VPN-A.inet.0` table. This is done using the RIB group to import the default route.
- **B. You do not need to use the RIB group to move interface routes from the inet.0 table to the VPN-A.inet.
0 table.**
- Correct. Interface routes (connected routes) are typically directly added to both the global and the VRF routing tables without needing a RIB group. These routes are known to the VRF because the interfaces are part of the VRF configuration.
- **C. You do not need to use the RIB group default route, which is learned through BGP, from the inet.0 table to the VPN-A.inet.0 table.**
- Incorrect. As discussed, the default route needs to be imported into the VRF's routing table using a RIB group to enable Internet access for the VRF.
- **D. You must use the RIB group to move interface routes from the inet.0 table to the VPN-A.inet.0 table.**
- Incorrect. Interface routes are directly associated with the VRF interfaces and are automatically known to the VRF routing table. There is no need to use a RIB group for these routes.
**Conclusion**:
The correct answers are:
**A. You must use the RIB group to move a default route, which is learned through BGP, from the inet.0 table to the VPN-A.inet.0 table.**
**B. You do not need to use the RIB group to move interface routes from the inet.0 table to the VPN-A.inet.0 table.**
**References**:
- Juniper Networks Documentation on RIB Groups: [RIB Groups Overview](https://www.juniper.net
/documentation/en_US/junos/topics/concept/rib-groups-overview.html)
- Junos OS VPNs Configuration Guide: [Junos VPNs Configuration](https://www.juniper.net/documentation
/en_US/junos/topics/concept/vpns-overview.html)

NEW QUESTION # 24
You are responding to an RFP for a new MPLS VPN implementation. The solution must use LDP for signaling and support Layer 2 connectivity without using BGP. The solution must be scalable and support multiple VPN connections over a single MPLS LSP. The customer wants to maintain all routing for their private network.
In this scenario, which solution do you propose?

A. BGP Layer 2 VPN
B. translational cross-connect
C. circuit cross-connect
D. LDP Layer 2 circuit

Answer: D

NEW QUESTION # 25
......

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Valid JN0-664 Guide Files, JN0-664 Test Dumps

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q20-Q25):

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