JUNIPER JN0-664 TEST DISCOUNT, JN0-664 DUMP FILE

Juniper JN0-664 Test Discount, JN0-664 Dump File

Juniper JN0-664 Test Discount, JN0-664 Dump File

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The JN0-664 Certification Exam covers a range of topics related to service provider routing and switching technologies, including Layer 2 and Layer 3 VPNs, multicast protocols, BGP, OSPF, IS-IS, and MPLS. Candidates will also be tested on their understanding of various Juniper Networks devices, including routers, switches, and firewalls.

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Juniper JN0-664 Certification Exam is a professional-level certification designed for individuals who are interested in pursuing a career in the service provider industry. Service Provider, Professional (JNCIP-SP) certification is designed to validate the skills and knowledge required to configure, troubleshoot, and maintain Juniper Networks' service provider routing and switching platforms.

Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q78-Q83):

NEW QUESTION # 78
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 bootstrap priority on R2 to be higher than R3
  • C. Change the local address 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: A

Explanation:
The issue arises because R3's group-range (224.1.1.0/28) is more specific than R2's group-range (224.1.1.0/24). In PIM bootstrap (BSR), the RP with the longest prefix (most specific group-range) is preferred, regardless of priority. Even though R3 has a higher bootstrap priority (210 vs. R2's 200), its more specific /28 group-range takes precedence for groups within 224.1.1.0/28.
Why Option D is Correct:
To force R4 to use R2 for all joins, R2's group-range must be more specific than R3's. For example:
If R2's group-range is changed to 224.1.1.0/28 (same as R3) but with a higher priority, R2 would win (priority is compared only when group-ranges are equal).
If R2's group-range is changed to 224.1.1.0/29 (more specific than /28), it will override R3's /28 for groups in the /29 range.
The key is prefix specificity, which overrides priority in BSR elections.
Why Other Options Are Incorrect:
A . Change bootstrap priority on R2 to be higher than R3:
Priority is evaluated only when group-ranges are identical. Since R3's group-range (/28) is more specific than R2's (/24), R3 will still win for groups in 224.1.1.0/28, even if R2's priority is higher.
B . Change the default route in inet.2 on R4:
RPF routes (inet.2) determine how traffic reaches the RP, but they do not influence RP election logic (BSR priority/group-range).
C . Change R2's local address to be higher than R3's:
The RP address is a tiebreaker only if priorities and group-ranges are equal. Since R3's group-range is more specific, this change has no impact.
Key Takeaways:
BSR RP Election Order:
Longest group prefix (most specific).
Highest priority (if prefixes are equal).
Highest RP address (if prefixes and priorities are equal).
To override R3, R2 must advertise a more specific group-range (e.g., /28 or smaller) to ensure it is selected for the desired multicast groups.
Reference:
Juniper PIM Sparse Mode and BSR Configuration.


NEW QUESTION # 79
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.)

  • A. Source1 will use RP1 and Receiver1 will use RP2 for group 224.1 1 1
  • B. Source2 will use RP1 and Receiver2 will use RP1 for group 224.2.2.2.
  • C. Source2 will use RP2 and Receiver2 will use RP2 for group 224.2.2.2.
  • D. Source1 will use RP1 and Receiver1 will use RP1 for group 224.1.1.1.

Answer: C,D

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 # 80
Exhibit

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

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

Answer: A,B

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.
# 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 # 81
Exhibit

R1 and R8 are not receiving each other's routes
Referring to the exhibit, what are three configuration commands that would solve this problem? (Choose three.)

  • A. Configure loops and advertise-peer-as on routers in AS 64497 and AS 64450.
  • B. Configure loops on routers in AS 65412 and advertise-peer-as on routers in AS 64498.
  • C. Configure as-override on advertisement from AS 64500 toward AS 64512.
  • D. Configure remove-private on advertisements from AS 64500 toward AS 64499
  • E. Configure remove-private on advertisements from AS 64497 toward AS 64498

Answer: B,D,E

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 # 82
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 discarded.
  • C. The packet will be forwarded with no classification changes.
  • D. The packet will be processed by the BA classifier first, then the MF classifier.

Answer: D

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
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.
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.
Final answer: ✅ 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 # 83
......

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