[Q38-Q55] Top Juniper JN0-664 Courses Online - Updated [Aug-2026]

Top Juniper JN0-664 Courses Online - Updated [Aug-2026]

JN0-664 Practice Dumps - Verified By TopExamCollection Updated 99 Questions

NEW QUESTION # 38
You are troubleshooting the connection between AS 64496 and AS 64497 and notice that only one of the paths is being used for traffic forwarding.
Referring to the exhibit, which three actions will ensure that R1 is configured properly for load balancing BGP routes? (Choose three.)

• A. Verify that the routing table on R1 has BGP routes for 203.0.113.128/25 with multiple next hops.
• B. Verify that there is a load balancing export policy under routing-options for the received BGP routes on R1.
• C. Verify that the multipath option is configured under protocols bgp on both R2 and R3.
• D. Verify that the multipath option is configured under protocols bgp on R1.
• E. Verify that an import load balancing policy exists under protocols bgp for the received BGP routes on R1.

Answer: A,B,D

NEW QUESTION # 39
You have an EVI implemented between PE-1, PE-2, and PE-3 to allow communication between CE-1 and CE-2. CE-2 receives unicast traffic from CE-1 on both links to PE-2 and PE-3. When CE-1 sends broadcast traffic. CE-2 receives it on only one of the multihomed links.
Referring to the exhibit, which EVPN route type enables this behavior?

• A. Type 3
• B. Type 2
• C. Type 4
• D. Type 1

Answer: C

NEW QUESTION # 40
Exhibit

Referring to the exhibit, which three statements are correct about route 10 0 0.0/16 when using the default BGP advertisement rules'? (Choose three.)

• A. R4 will advertise 10 0.0 0/16 to R6 with 172.16 1 1 as the next hop
• B. R1 will advertise 10.0.0.0/16 to R2 with 192 168 1 1 as the next hop.
• C. R1 will prepend AS 65531 when advertising 10 0.0 0/16 to R2.
• D. R2 will advertise 10.0.0.0/16 to R4 with 172.16.1.1 as the next hop
• E. R2 will advertise 10.0.0.0/16 to R3 with 192.168.1 1 as the next hop

Answer: A,B,D

Explanation:
Explanation
The problem in this scenario is that R1 and R8 are not receiving each other's routes because of private AS numbers in the AS path. Private AS numbers are not globally unique and are not advertised to external BGP peers. To solve this problem, you need to do the following:
* Configure loops on routers in AS 65412 and advertise-peer-as on routers in AS 64498. This allows R5 and R6 to advertise their own AS number (65412) instead of their peer's AS number (64498) when sending updates to R7 and R8. This prevents a loop detection issue that would cause R7 and R8 to reject the routes from R5 and R62
* Configure remove-private on advertisements from AS 64497 toward AS 64498 and from AS 64500 toward AS 64499. This removes any private AS numbers from the AS path before sending updates to external BGP peers. This allows R2 and R3 to receive the routes from R1 and R4, respectively3.

NEW QUESTION # 41
Referring to the exhibit, which path would traffic passing through R1 take to get to R4?

• A. R1 -> R4
• B. R1 -> R2 -> R3 -> R4
• C. R1 -> R2 -> R4
• D. R1 -> R3 -> R4

Answer: C

NEW QUESTION # 42
Exhibit

CE-1 and CE-2 are part of a VPLS called Customer1 No connectivity exists between CE-1 and CE-2. In the process of troubleshooting, you notice PE-1 is not learning any routes for this VPLS from PE-2, and PE-2 is not learning any routes for this VPLS from PE-1.

• A. The route target must match on PE-1 and PE-2.
• B. The instance type should be changed to I2vpn.
• C. The no-tunnel-services statement should be deleted on both PEs.
• D. The route distinguisher must match on PE-1 and PE-2.

Answer: A

Explanation:
VPLS is a technology that provides Layer 2 VPN services over an MPLS network. VPLS uses BGP as its control protocol to exchange VPN membership information between PE routers. The route target is a BGP extended community attribute that identifies which VPN a route belongs to. The route target must match on PE routers that participate in the same VPLS instance, otherwise they will not accept or advertise routes for that VPLS.

NEW QUESTION # 43
Exhibit

Referring to the exhibit, you must provide Internet access for VPN-A using CE-1 as the hub CE.
Which two statements are correct in this situation? (Choose two.)

• A. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1.
• B. RIB groups are not needed to leak routes between the inet. 0 and VPN-A. inet. 0 tables,
• C. You must use RIB groups to leak routes between the inet. o and vpn-a. inet. o tables.
• D. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> GW-1.

Answer: A,C

Explanation:
To provide Internet access for VPN-A using CE-1 as the hub CE, you need to do the following:
* You must use RIB groups to leak routes between the inet.0 and vpn-a.inet.0 tables on PE-1 and CE-1.
RIB groups are routing options that allow you to import routes from one routing table into another routing table based on certain criteria. In this scenario, you need to configure RIB groups on PE-1 and CE-1 to import Internet routes from inet.0 into vpn-a.inet.0 and vice versa.
* Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1. This is because Site 2 does not have direct Internet access and needs to use CE-1 as its default gateway for Internet traffic. Site 2 sends its Internet traffic to PE-2, which forwards it to PE-1 based on VPN-A routes. PE-1 then sends it to CE-1 based on RIB group import policy. CE-1 then sends it back to PE-1 based on its default route pointing to GW-1. PE-1 then forwards it to GW-1 based on RIB group import policy again.

NEW QUESTION # 44
Which two statements about IS-IS are correct? (Choose two.)

• A. PSNPs are used to acknowledge a received LSP.
• B. PSNPs are used to request a missing LSP.
• C. CSNPs are used to request a missing LSP.
• D. CSNPs are used to acknowledge a received LSP.

Answer: A,B

Explanation:
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol used to move information efficiently within a computer network. It uses a series of Protocol Data Units (PDUs) to manage the network's topology and ensure consistency across all routers in the network. Specifically, Link State PDUs (LSPs), Complete Sequence Number PDUs (CSNPs), and Partial Sequence Number PDUs (PSNPs) play crucial roles in this process.
1. **PSNPs (Partial Sequence Number PDUs)**:
- **Acknowledge a received LSP**: PSNPs are used to acknowledge the receipt of LSPs. When a router receives an LSP, it sends a PSNP back to the sender to confirm that the LSP has been received.
- **Request a missing LSP**: PSNPs are also used to request missing LSPs. If a router identifies a missing LSP based on sequence numbers, it can send a PSNP to request the specific LSP from its neighbors.
2. **CSNPs (Complete Sequence Number PDUs)**:
- **Summarize LSPs**: CSNPs are used to summarize all the LSPs known to a router. They are typically sent at regular intervals to provide a complete list of LSPs in a database. They are not used to acknowledge or request specific LSPs but provide an overview of all LSPs for database synchronization.
Based on this understanding, let's evaluate the statements:
- **A. PSNPs are used to acknowledge a received LSP.**
- Correct. PSNPs serve the purpose of acknowledging LSPs received from other routers.
- **B. CSNPs are used to acknowledge a received LSP.**
- Incorrect. CSNPs are not used for acknowledging LSPs; they are used to provide a summary of all LSPs.
- **C. CSNPs are used to request a missing LSP.**
- Incorrect. CSNPs are not used to request missing LSPs; this is the role of PSNPs.
- **D. PSNPs are used to request a missing LSP.**
- Correct. PSNPs are used to request specific missing LSPs when a router detects that it is missing information.
**Conclusion**:
The correct statements about IS-IS are:
**A. PSNPs are used to acknowledge a received LSP.**
**D. PSNPs are used to request a missing LSP.**
**Reference**:
- Juniper Networks Documentation on IS-IS: [IS-IS Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/is-is-routing-overview.html)
- RFC 1195, Use of OSI IS-IS for Routing in TCP/IP and Dual Environments: [RFC 1195](https://tools.ietf.org/html/rfc1195) which details the operation and use of IS-IS, including the roles of PSNPs and CSNPs.

NEW QUESTION # 45
Exhibit.

Referring to the exhibit, which path would traffic passing through R1 take to get to R4?

• A. R1 -> R4
• B. R1 -> R2 -> R3 -> R4
• C. R1 -> R2 -> R4
• D. R1 -> R3 -> R4

Answer: C

Explanation:
The OSPF cost is carried in the LSAs that are exchanged within an OSPF area. When a router calculates the cost to a destination it uses the cost of the exit interface of each router in the path to the destination.

NEW QUESTION # 46
Which two statements are correct about a sham link? (Choose two.)

• A. It creates a BGP multihop neighborship between two PE routers.
• B. It creates an OSPF multihop neighborship between two PE routers.
• C. The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes
• D. The PEs exchange Type 3 OSPF LSAs instead of Type 1 OSPF LSAs for the L3VPN routes.

Answer: B,C

NEW QUESTION # 47
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?

• A. route-target
• B. add-path
• C. multihop
• D. multipath

Answer: B

Explanation:
Explanation
BGP add-path is a feature that allows the advertisement of multiple paths through the same peering session for the same prefix without the new paths implicitly replacing any previous paths. This behavior promotes path diversity and reduces multi-exit discriminator (MED) oscillations. BGP add-path is implemented by adding a path identifier to each path in the NLRI. The path identifier can be considered as something similar to a route distinguisher in VPNs, except that a path ID can apply to any address family. Path IDs are unique to a peering session and are generated for each network3. In this question, we have a route reflector (RR) that receives two routes for the same prefix (192.168.0.0/16) from an EBGP neighbor. By default, the RR will only advertise its best path to its clients (R1 and R2). However, we want R1 and R2 to receive both routes from the RR. To achieve this, we need to configure BGP add-path on the RR and enable it to send multiple paths for the same prefix to its clients.

NEW QUESTION # 48
An interface is configured with a behavior aggregate classifier and a multifield classifier How will the packet be processed when received on this interface?

• A. The packet will be processed by the MF classifier first, then the BA classifier.
• B. The packet will be processed by the BA classifier first, then the MF classifier.
• C. The packet will be forwarded with no classification changes.
• D. The packet will be discarded.

Answer: B

Explanation:
When a Juniper device receives a packet on an interface with both a Behavior Aggregate (BA) classifier and a Multifield (MF) classifier, Junos OS follows a specific processing order to apply Class of Service (CoS).
Understanding the Classifiers in Junos CoS
1## Behavior Aggregate (BA) Classifier
* Uses packet headers (DSCP, IP precedence, or MPLS EXP bits) to classify traffic into forwarding classes.
* Applied at the ingress interface.
* Example: A packet with DSCP 46 (Expedited Forwarding) is mapped to a high-priority queue.
2## Multifield (MF) Classifier
* Uses match conditions (like source/destination IP, port numbers, protocol types) to classify traffic.
* Typically used for more granular classification beyond what BA can provide.
Junos Processing Order:
# When both BA and MF classifiers are configured on an interface, Junos first applies the BA classifier, then the MF classifier.
# MF classifier can override the BA classification if necessary.
Evaluating the Answer Choices
# B. The packet will be processed by the BA classifier first, then the MF classifier.
* Correct, because Junos first applies BA classification based on DSCP/MPLS EXP bits.
* After BA classification, the MF classifier is applied, which can refine or override the BA classification.
# A. The packet will be discarded.
* Incorrect, because classification does not drop packets unless explicitly configured with a filter or policing action.
# C. The packet will be forwarded with no classification changes.
* Incorrect, because both classifiers are applied in a specific order, meaning classification changes will occur.
# D. The packet will be processed by the MF classifier first, then the BA classifier.
* Incorrect, because BA classification is always applied first, followed by MF classification.
# B. The packet will be processed by the BA classifier first, then the MF classifier.
# Official Juniper Reference:
"When both BA and MF classifiers are applied on an interface, Junos OS first classifies packets using the BA classifier before applying the MF classifier."

NEW QUESTION # 49
Which two statements are correct about VPLS tunnels? (Choose two.)

• A. BGP-signaled VPLS tunnels require manual provisioning of sites.
• B. LDP-signaled VPLS tunnels only support control bit 0.
• C. LDP-signaled VPLS tunnels use auto-discovery to provision sites
• D. BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.

Answer: C,D

Explanation:
Explanation
VPLS is a Layer 2 VPN technology that allows multiple sites to connect over a shared IP/MPLS network as if they were on the same LAN. VPLS tunnels can be signaled using either Label Distribution Protocol (LDP) or Border Gateway Protocol (BGP). LDP-signaled VPLS tunnels use auto-discovery to provision sites, meaning that PE routers can automatically discover other PE routers that belong to the same VPLS instance

NEW QUESTION # 50
Referring to the exhibit, a working L3VPN exists that connects VPN-A sites. CoS is configured correctly to match on the MPLS EXP bits of the LSP. but when traffic is sent from Site-1 to Site-2.
PE-2 is not classifying the traffic correctly.
What should you do to solve the problem?

• A. Configure the explicit-null statement on PE-1.
• B. Set a static CoS value for the PE-1_to_PE-2 LSP.
• C. Configure the explicit-null statement on PE-2.
• D. Configure VPN prefix mapping for the PE-1_to_PE-2 LSP.

Answer: C

NEW QUESTION # 51
Exhibit

R4 is directly connected to both RPs (R2 and R3) R4 is currently sending all ,o,ns upstream to R3 but you want all joins to go to R2 instead Referring to the exhibit, which configuration change will solve this issue?

• A. Change the group-range to be more specific on R2 than R3.
• B. Change the local address on R2 to be higher than R3.
• C. Change the bootstrap priority on R2 to be higher than R3
• D. Change the default route in inet.2 on R4 from R3 as the next hop to R2

Answer: C

Explanation:
Explanation
PIM Bootstrap Router (BSR) is a mechanism that allows PIM routers to discover and announce rendezvous point (RP) information for multicast groups. BSR uses two roles: candidate BSR and candidate RP. Candidate BSR is the router that collects information from all available RPs in the network and advertises it throughout the network. Candidate RP is the router that wants to become the RP and registers itself with the BSR. There can be only one active BSR in the network, which is elected based on the highest priority or highest IP address if the priority is the same. The BSR priority can be configured manually or assigned automatically. The default priority is 0 and the highest priority is 2551. In this question, R4 is directly connected to both RPs (R2 and R3) and is currently sending all joins upstream to R3 but we want all joins to go to R2 instead. To achieve this, we need to change the BSR priority on R2 to be higher than R3 so that R2 becomes the active BSR and advertises its RP information to R4.

NEW QUESTION # 52
Exhibit

Referring to the exhibit, which two statements are correct about the dual route reflectors within a cluster?
(Choose two.)

• A. RR1 and RR2 advertise routes learned from the clients to EBGP peers, using itself as the next hop.
• B. RR1 advertises routes from the client to RR2. using itself as the next hop.
• C. RR1 and RR2 must have the same duster ID to exchange routes learned from the client.
• D. RR1 and RR2 append the duster ID when advertising routes from dient to dient.

Answer: A,D

NEW QUESTION # 53

Click the Exhibit hutton.
You are configuring an interprovider Option C Layer 3 VPN to connect two customer sites.
Referring to the exhibit, which three statements are correct? (Choose three.)

• A. P routers only maintain the internal routes from their own AS.
• B. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.
• C. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.
• D. P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
• E. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.

Answer: A,B,C

Explanation:
Interprovider Option C for Layer 3 VPNs involves the use of Autonomous System Boundary Routers (ASBRs) to exchange labeled VPN-IPv4 routes between different Autonomous Systems (AS). This option requires BGP sessions between ASBRs, and the VPN routes are carried end-to-end using MPLS labels. Here' s a detailed analysis of the roles of different routers in this scenario:
1. **ASBR Routers**:
- ASBRs are responsible for exchanging VPN-IPv4 routes between different ASes.
- **A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.**
- Correct. ASBRs maintain routes to internal destinations within their own AS, and they also need to know the loopback addresses of PEs in the other AS to set up the BGP sessions and MPLS tunnels.
2. **PE Routers**:
- PE routers are responsible for maintaining VPN routes and label information to forward VPN traffic correctly.
- **B. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
- Correct. PE routers need to maintain:
- Internal routes within their AS for routing.
- Loopback addresses of other AS PEs for establishing MPLS LSPs.
- L3VPN routes to provide end-to-end VPN connectivity.
3. **P Routers**:
- P routers are the core routers that do not participate in BGP VPN routing but forward labeled packets based on MPLS labels.
- **C. P routers only maintain the internal routes from their own AS.**
- Correct. P routers maintain the internal routing information to forward packets within the AS and use MPLS labels for forwarding VPN packets. They do not maintain VPN routes or routes from other ASes.
4. **Incorrect Statements**:
- **D. P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
**
- Incorrect. P routers do not need to maintain the loopback addresses of other AS PEs. They only maintain internal routing and MPLS label information.
- **E. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
- Incorrect. ASBR routers do not maintain L3VPN routes. They exchange labeled VPN-IPv4 routes with other ASBRs and forward them to PE routers.
**Conclusion**:
The correct answers are:
**A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.**
**B. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
**C. P routers only maintain the internal routes from their own AS.**
**References**:
- Juniper Networks Documentation on Interprovider VPNs: [Interprovider VPN Configuration](https://www.
juniper.net/documentation/en_US/junos/topics/topic-map/mpls-vpn-interprovider.html)
- MPLS and VPN Architectures, CCIP Edition by Ivan Pepelnjak and Jim Guichard

NEW QUESTION # 54
When using OSPFv3 for an IPv4 environment, which statement is correct?

• A. OSPFv3 only supports IPv4.
• B. OSPFv3 supports both IPv6 and IPv4, but not in the same routing instance.
• C. OSPFv3 is not backward compatible with IPv4
• D. OSPFv3 supports IPv4 only on interfaces with family inet6 defined

Answer: D

NEW QUESTION # 55
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