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Juniper JN0-664 certification exam is a computer-based test that consists of 65 multiple-choice questions. Candidates have 120 minutes to complete the exam, and they must achieve a passing score of 65% or higher to earn the certification. JN0-664 exam is administered by Pearson VUE, and it can be taken at any Pearson VUE testing center worldwide.

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q61-Q66):

NEW QUESTION # 61
Exhibit

Referring to the exhibit, which statement is true?

A. The 10.101.1.0/24 route will be shared if the vrf-table-label parameter is configured.
B. The 10.101.1.0/24 route will only be shared if BGP is configured in the routing instance
C. The 10.101.1 0/24 route will be shared if there are other VRFs that use the same route target community
D. The 10.101.1.0/24 route will be shared if the auto-export parameter is configured

Answer: D

Explanation:
The auto-export parameter is a routing option that allows a routing instance to share routes with other routing instances or the master routing table. The auto-export parameter automatically exports routes from one routing instance to another based on the route target communities attached to the routes. In this scenario, the
10.101.1.0/24 route will be shared if the auto-export parameter is configured under [edit routing-options] hierarchy level.

NEW QUESTION # 62
You are asked to protect your company's customers from amplification attacks. In this scenario, what is Juniper's recommended protection method?

A. destination-based Remote Triggered Black Hole
B. unicast Reverse Path Forwarding
C. ASN prepending
D. BGP FlowSpec

Answer: A

Explanation:
Explanation
amplification attacks are a type of distributed denial-of-service (DDoS) attack that exploit the characteristics of certain protocols to amplify the traffic sent to a victim. For example, an attacker can send a small DNS query with a spoofed source IP address to a DNS server, which will reply with a much larger response to the victim. This way, the attacker can generate a large amount of traffic with minimal resources.
One of the methods to protect against amplification attacks is destination-based Remote Triggered Black Hole (RTBH) filtering. This technique allows a network operator to drop traffic destined to a specific IP address or prefix at the edge of the network, thus preventing it from reaching the victim and consuming bandwidth and resources. RTBH filtering can be implemented using BGP to propagate a special route with a next hop of
192.0.2.1 (a reserved address) to the edge routers. Any traffic matching this route will be discarded by the edge routers.

NEW QUESTION # 63
Which two statements are correct regarding bootstrap messages that are forwarded within a PIM sparse mode domain? (Choose two.)

A. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain.
B. Bootstrap messages are forwarded only to routers that explicitly requested the messages within the PIM sparse-mode domain
C. Bootstrap messages are used to notify which router is the PIM RP
D. Bootstrap messages distribute RP information dynamically during an RP election.

Answer: A,D

Explanation:
Bootstrap messages are PIM messages that are used to distribute rendezvous point (RP) information dynamically during an RP election. Bootstrap messages are sent by bootstrap routers (BSRs), which are routers that are elected to perform the RP discovery function for a PIM sparse-mode domain. Bootstrap messages contain information about candidate RPs and their multicast groups, as well as BSR priority and hash mask length. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain using hop-by-hop flooding.

NEW QUESTION # 64
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 identify BGP routes learned from the local CE device.
B. This value is used to identify BGP routes learned from the remote PE device.
C. This value is used to add a target community to BGP routes advertised to the remote PE device.
D. This value is used to add a target community to BGP routes advertised to the local CE device.

Answer: B,C

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.**
**References**:
- 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 # 65
By default, which statement is correct about OSPF summary LSAs?

A. All Type 2 and Type 7 LSAs will be summanzed into a single Type 5 LSA
B. Type 3 LSAs are advertised for routes in Type 1 LSAs.
C. The area-range command must be installed on all routers.
D. The metric associated with a summary route will be equal to the lowest metric associated with an individual contributing route

Answer: B

Explanation:
Explanation
OSPF uses different types of LSAs to describe different aspects of the network topology. Type 1 LSAs are also known as router LSAs, and they describe the links and interfaces of a router within an area. Type 3 LSAs are also known as summary LSAs, and they describe routes to networks outside an area but within the same autonomous system (AS). By default, OSPF will summarize routes from Type 1 LSAs into Type 3 LSAs when advertising them across area boundaries .

NEW QUESTION # 66
......

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