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The Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Exam is a certification exam that is designed to test the knowledge and skills of IT professionals who are seeking to become certified as Juniper Networks Certified Internet Professionals in the Service Provider space. This exam is intended for those who have already obtained the Juniper Networks Certified Internet Associate (JNCIA-SP) certification and have some experience in the field.

The JN0-664 exam covers a wide range of topics related to service provider routing and switching technologies, including Border Gateway Protocol (BGP), Intermediate System to Intermediate System (IS-IS), Routing Information Protocol (RIP), and Open Shortest Path First (OSPF). Additionally, the exam also covers advanced topics such as multicast, MPLS, and layer 2 VPNs.

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q17-Q22):

NEW QUESTION # 17
You are asked to protect your company's customers from amplification attacks. In this scenario, what is Juniper's recommended protection method?

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

Answer: C

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 # 18
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 -> GW-1.
B. You must use RIB groups to leak routes between the inet. o and vpn-a. inet. o tables.
C. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1.
D. RIB groups are not needed to leak routes between the inet. 0 and VPN-A. inet. 0 tables,

Answer: B,C

Explanation:
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 # 19
Exhibit

You have MAC addresses moving in your EVPN environment
Referring to the exhibit, which two statements are correct about the sequence number? (Choose two)

A. It identifies MAC addresses that should be discarded.
B. It resolves conflicting MAC address ownership claims.
C. It is advertised using a Type 2 message
D. It helps the local PE to identify the latest advertisement.

Answer: B,D

Explanation:
Explanation
The sequence number is a field in the MAC mobility extended community that is used to resolve conflicting MAC address ownership claims and to help the local PE to identify the latest advertisement. The sequence number is incremented by one for every MAC address mobility event, such as when a host moves from one Ethernet segment to another segment in the EVPN network. The PE device that receives multiple MAC advertisements for the same MAC address chooses the one with the highest sequence number as the most recent and valid advertisement.

NEW QUESTION # 20
When using OSPFv3 for an IPv4 environment, which statement is correct?

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

Answer: B

Explanation:
Explanation
OSPFv3 is an extension of OSPFv2 that supports IPv6 routing and addressing. OSPFv3 is not backward compatible with IPv4 because it uses a different packet format and a different link-state advertisement (LSA) structure than OSPFv2. OSPFv3 also uses IPv6 link-local addresses as router IDs and neighbor addresses, instead of IPv4 addresses. To use OSPFv3 for an IPv4 environment, you need to enable the IPv4 unicast address family under [edit protocols ospf3] hierarchy level and configure IPv4 addresses on the interfaces.

NEW QUESTION # 21
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. circuit cross-connect
B. BGP Layer 2 VPN
C. translational cross-connect
D. LDP Layer 2 circuit

Answer: D

Explanation:
Explanation
AToM (Any Transport over MPLS) is a framework that supports various Layer 2 transport types over an MPLS network core. One of the transport types supported by AToM is LDP Layer 2 circuit, which is a point-to-point Layer 2 connection that uses LDP for signaling and MPLS for forwarding. LDP Layer 2 circuit can support Layer 2 connectivity without using BGP and can be scalable and efficient by using a single MPLS LSP for multiple VPN connections. The customer can maintain all routing for their private network by using their own CE switches.

NEW QUESTION # 22
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