JN0-664 STUDY MATERIALS & JN0-664 TEST QUESTIONS & JN0-664 PRACTICE TEST

JN0-664 Study Materials & JN0-664 Test Questions & JN0-664 Practice Test

JN0-664 Study Materials & JN0-664 Test Questions & JN0-664 Practice Test

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q44-Q49):

NEW QUESTION # 44
Exhibit.

Referring to the exhibit; the 10.0.0.0/24 EBGP route is received on R5; however, the route is being hidden.
What are two solutions that will solve this problem? (Choose two.)

  • A. Add the external interface prefix to the IGP routing tables
  • B. Add the internal interface prefix to the BGP routing tables.
  • C. On R4, create a policy to change the BGP next hop to 172.16.1.1 and apply it to IBGP as an export policy
  • D. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy

Answer: A,D

Explanation:
the default behavior for iBGP is to propagate EBGP-learned prefixes without changing the next-hop. This can cause issues if the next-hop is not reachable via the IGP. One solution is to use the next-hop self command on R4, which will change the next-hop attribute to its own loopback address. This way, R5 can reach the next-hop via the IGP and install the route in its routing table.
Another solution is to add the external interface prefix (120.0.4.16/30) to the IGP routing tables of R4 and R5.
This will also make the next-hop reachable via the IGP and allow R5 to use the route. According to 2, this is a possible workaround for a pure IP network, but it may not work well for an MPLS network.
The reason why the route is being hidden is that R5 cannot reach the BGP next hop 10.0.0.1, which is the address of R1. R5 does not have a route to 10.0.0.0/24 in its routing table, and neither does R4. Therefore, R5 cannot resolve the BGP next hop and marks the route as hidden.
There are two solutions that will solve this problem:
* Option A: On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy. This way, R5 will receive the route with a next hop of 172.16.1.2, which is reachable via the IGP. This solution is also known as next-hop-self1.
* Option B: Add the external interface prefix to the IGP routing tables. This way, R4 and R5 will learn a route to 10.0.0.0/24 via the IGP and be able to resolve the BGP next hop. This solution is also known as recursive lookup2.
Option C is not correct because adding the internal interface prefix to the BGP routing tables will not help R5 reach the BGP next hop 10.0.0.1.
Option D is not correct because changing the BGP next hop to 172.16.1.1 on R4 will not help R5 either, since R5 does not have a route to 172.16.1.1 in its routing table.
References: 1: Configuring Next-Hop-Self for IBGP Peers 2: Understanding Recursive Lookup


NEW QUESTION # 45
You are configuring a Layer 3 VPN between two sites. You are configuring the vrf-target target : 65100:100 statement in your routing instance.
In this scenario, which two statements describe the vrf-target configuration? (Choose two.)

  • A. This value is used to add a target community to BGP routes advertised to the remote PE device.
  • B. This value is used to add a target community to BGP routes advertised to the local CE device.
  • C. This value is used to identify BGP routes learned from the local CE device.
  • D. This value is used to identify BGP routes learned from the remote PE device.

Answer: A,D

Explanation:
The `vrf-target` statement in a Layer 3 VPN configuration is used to control the import and export of VPN routes by attaching a target community to the routes. This helps in defining which VPN routes should be imported into or exported from a particular VRF (Virtual Routing and Forwarding) instance.
1. **Understanding VRF Target**:
- The `vrf-target` statement specifies the extended community attributes (route targets) that are used to control the import and export of routes in a VRF.
- These attributes help in identifying which routes should be shared between different VRFs, particularly across different PE (Provider Edge) devices.
2. **Statements Analysis**:
- **A. This value is used to identify BGP routes learned from the local CE device.**
- Incorrect. The `vrf-target` attribute is not used to identify routes learned from the local CE device. It is used to manage routes between PE devices and within the provider's MPLS network.
- **B. This value is used to identify BGP routes learned from the remote PE device.**
- Correct. The `vrf-target` value helps in identifying which routes from remote PE devices should be imported into the local VRF. It essentially acts as a filter for importing BGP routes with matching target communities.
- **C. This value is used to add a target community to BGP routes advertised to the local CE device.**
- Incorrect. Routes advertised to the local CE device do not use the `vrf-target` attribute. Instead, these routes are typically managed within the local VRF routing table.
- **D. This value is used to add a target community to BGP routes advertised to the remote PE device.**
- Correct. When advertising routes from the local PE to remote PE devices, the `vrf-target` value is added to these routes. This target community ensures that the correct routes are shared across the VPN.
**Conclusion**:
The correct statements about the `vrf-target` configuration in a Layer 3 VPN scenario are:
**B. This value is used to identify BGP routes learned from the remote PE device.**
**D. This value is used to add a target community to BGP routes advertised to the remote PE device.**
**Reference**:
- Juniper Networks Documentation on VRF Target: [VRF Target Configuration](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/layer-3-vpns.html)
- MPLS and VPN Architectures by Ivan Pepelnjak and Jim Guichard


NEW QUESTION # 46
Which statement is correct about IS-IS when it performs the Dijkstra algorithm?

  • A. Tuples with the lowest cost are moved from the tree database to the LSDB.
  • B. The local router moves its own local tuples into the candidate database
  • C. When a new neighbor ID in the tree database matches a router ID in the LSDB, the neighbor ID is moved to the candidate database
  • D. The algorithm will stop processing once the tree database is empty.

Answer: B


NEW QUESTION # 47
Exhibit

You want to implement the BGP Generalized TTL Security Mechanism (GTSM) on the network Which three statements are correct in this scenario? (Choose three)

  • A. BGP GTSM requires a TTL of 255 to be configured between neighbors.
  • B. BGP GTSM requires a firewall filter to discard packets with incorrect TTL.
  • C. BGP GTSM requires a TTL of 1 to be configured between neighbors.
  • D. You can implement BGP GTSM between R2 and R1.
  • E. You can implement BGP GTSM between R2, R3, and R4

Answer: A,B,D

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/multihop-edit-protocols-bgp.html


NEW QUESTION # 48
What is the correct order of packet flow through configurable components in the Junos OS CoS features?

  • A. Behavior Aggregate Classifier -> Multifield Classifier -> Input Policer -> Forwarding Policy Options -> Fabric Scheduler -> Scheduler/Shaper/RED -> Output Policer -> Rewrite Marker
  • B. Behavior Aggregate Classifier -> Input Policer -> Multifield Classifier -> Forwarding Policy Options -> Fabric Scheduler -> Output Policer -> Scheduler/Shaper/RED -> Rewrite Marker
  • C. Multifield Classifier -> Behavior Aggregate Classifier -> Input Policer -> Forwarding Policy Options -> Fabric Scheduler -> Output Policer -> Rewrite Marker -> Scheduler/Shaper/RED
  • D. Behavior Aggregate Classifier -> Multifield Classifier -> Input Policer -> Forwarding Policy Options -> Fabric Scheduler -> Output Policer -> Scheduler/Shaper/RED -> Rewrite Marker

Answer: B

Explanation:
The correct order of packet flow through configurable components in the Junos OS CoS features is as follows:
Behavior Aggregate Classifier: This component uses a single field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined or user-defined values.
Input Policer: This component applies rate-limiting and marking actions to incoming traffic based on the forwarding class and loss priority assigned by the classifier.
Multifield Classifier: This component uses multiple fields in a packet header to classify traffic into different forwarding classes and loss priorities based on user-defined values and filters.
Forwarding Policy Options: This component applies actions such as load balancing, filtering, or routing to traffic based on the forwarding class and loss priority assigned by the classifier.
Fabric Scheduler: This component schedules traffic across the switch fabric based on the forwarding class and loss priority assigned by the classifier.
Output Policer: This component applies rate-limiting and marking actions to outgoing traffic based on the forwarding class and loss priority assigned by the classifier.
Scheduler/Shaper/RED: This component schedules, shapes, and drops traffic at the egress interface based on the forwarding class and loss priority assigned by the classifier.
Rewrite Marker: This component rewrites the code-point bits of packets leaving an interface based on the forwarding class and loss priority assigned by the classifier.


NEW QUESTION # 49
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