What is the JN0-664 certification exam?

The JN0-664 is Juniper's Service Provider Routing and Switching, Professional level certification exam. It validates advanced knowledge of routing and switching technologies specifically designed for service provider environments and network professionals.

Who should take the JN0-664 exam?

Network professionals with substantial experience in service provider routing and switching who want to achieve professional-level certification should take this exam. It's ideal for those seeking to advance their careers in ISP, carrier, or large enterprise networking roles.

What topics are covered on the JN0-664 exam?

The exam covers advanced routing protocols, MPLS, BGP, advanced switching concepts, service provider architectures, and Junos OS configuration for large-scale networks. It also includes topics related to network security, QoS, and service delivery in provider environments.

How long is the JN0-664 exam and how many questions are there?

The JN0-664 exam is typically 90 minutes long and contains approximately 60-70 questions in various formats. The exam is proctored and must be completed within the allotted time frame.

What prerequisites should I have before taking the JN0-664 exam?

Juniper recommends having extensive hands-on experience with Junos OS and service provider networks before attempting this professional-level exam. Passing the JN0-663 (Associate level) exam or equivalent practical experience is highly recommended for success.

Free Juniper JN0-664 Exam Questions

Q1 MultipleChoice

Your organization manages a Layer 3 VPN for multiple customers To support advanced route than one BGP community on advertised VPN routes to remote PE routers.

Which routing-instance configuration parameter would support this requirement?

Avrf-export

Bvrf-import

Cvrf-target export

Dvrf-target import

Correct Answer: A

Explanation:

The vrf-target statement is used in routing-instances to define route-target communities for VPN route import and export policies.

vrf-target export Controls which route targets (RTs) are added to advertised routes (used when sending routes to remote PEs).

vrf-target import Controls which VPN routes are accepted into the VRF (used when receiving routes from remote PEs).

Q2 MultipleChoice

Exhibit

Which two statements are true about the OSPF adjacency displayed in the exhibit? (Choose two.)

AThere is a mismatch in the hello interval parameter between routers R1 and R2

BThere is a mismatch in the dead interval parameter between routers R1 and R2.

CThere is a mismatch in the OSPF hold timer parameter between routers R1 and R2.

DThere is a mismatch in the poll interval parameter between routers R1 and R2.

Correct Answer: A, B

Explanation:

The hello interval is the time interval between two consecutive hello packets sent by an OSPF router on an interface. The dead interval is the time interval after which a neighbor is declared down if no hello packets are received from it. These parameters must match between two OSPF routers for them to form an adjacency. In the exhibit, router R1 has a hello interval of 10 seconds and a dead interval of 40 seconds, while router R2 has a hello interval of 30 seconds and a dead interval of 120 seconds.This causes a mismatch and prevents them from becoming neighbors23.

Q3 MultipleChoice

Exhibit

Referring to the exhibit, PE-1 and PE-2 are getting route updates for VPN-B when neither of them service that VPN

Which two actions would optimize this process? (Choose two.)

AConfigure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the PEs.

BConfigure the family route-target statement on the RR.

CConfigure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the RR.

DConfigure the family route-target statement on the PEs.

Correct Answer: B, C

Explanation:

BGP route target filtering can be configured on PE devices or on route reflectors (RRs). Configuring BGP route target filtering on RRs is more efficient and scalable, as it reduces the number of BGP sessions and updates between PE devices. To configure BGP route target filtering on RRs, the following steps are required:

Configure the family route-target statement under the BGP group or neighbor configuration on the RRs. This enables the exchange of the route-target address family between the RRs and their clients (PE devices). Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement under the routing-options configuration on the RRs. This enables the RRs to resolve next hops for VPN routes using the inet.0 routing table.

Q4 MultipleChoice

Which statement is true regarding BGP FlowSpec?

AIt uses a remote triggered black hole to protect a network from a denial-of-service attack.

BIt uses dynamically created routing policies to protect a network from denial-of-service attacks

CIt is used to protect a network from denial-of-service attacks dynamically

DIt verifies that the source IP of the incoming packet has a resolvable route in the routing table

Correct Answer: C

Q5 MultipleChoice

Exhibit

You must ensure that the VPN backbone is preferred over the back door intra-area link as long as the VPN is available. Referring to the exhibit, which action will accomplish this task?

AConfigure an import routing policy on the CE routers that rejects OSPF routes learned on the backup intra-area link.

BEnable OSPF traffic-engineering.

CConfigure the OSPF metric on the backup intra-area link that is higher than the L3VPN link.

DCreate an OSPF sham link between the PE routers.

Correct Answer: 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.To create a sham link, you need to configure the local and remote addresses of the PE routers under the [edit protocols ospf area area-id] hierarchy level1.

https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/topic-map/configuring-ospfv2-sham-links.html

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