JN0-664 Practice Exams and Training Solutions for Certifications [Q20-Q43]

JN0-664 Practice Exams and Training Solutions for Certifications

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The JN0-664 exam covers a range of topics related to Juniper Networks service provider technologies, including routing, switching, network protocols, and security. JN0-664 exam is designed to test the candidate's ability to configure and troubleshoot Juniper Networks equipment in a service provider environment and to demonstrate their understanding of key concepts and best practices.

Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) certification exam is designed for individuals who have a strong understanding of the Junos OS routing and switching technology in a service provider environment. Service Provider, Professional (JNCIP-SP) certification exam is a part of the Juniper Networks Certified Professional Service Provider (JNCIP-SP) certification track. Passing JN0-664 exam validates an individual's ability to configure, implement, and troubleshoot a variety of service provider routing and switching technologies.

NEW QUESTION # 20
Exhibit

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

A. There is a mismatch in the poll interval parameter between routers R1 and R2.
B. There is a mismatch in the hello interval parameter between routers R1 and R2
C. There is a mismatch in the OSPF hold timer parameter between routers R1 and R2.
D. There is a mismatch in the dead interval parameter between routers R1 and R2.

Answer: B,D

Explanation:
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.

NEW QUESTION # 21
Which two statements describe PIM-SM? (Choose two)

A. Routers with receivers send join messages to their upstream neighbors.
B. Traffic is initially flooded to all routers and an S,G is maintained for each group
C. Routers without receivers must periodically prune themselves from the SPT.
D. Traffic is only forwarded to routers that request to join the distribution tree.

Answer: A,D

Explanation:
PIM sparse mode (PIM-SM) is a multicast routing protocol that uses a pull model to deliver multicast traffic.
In PIM-SM, routers with receivers send join messages to their upstream neighbors toward a rendezvous point (RP) or a source-specific tree (SPT). The RP or SPT acts as the root of a shared distribution tree for a multicast group. Traffic is only forwarded to routers that request to join the distribution tree by sending join messages.
PIM-SM does not flood traffic to all routers or prune routers without receivers, as PIM dense mode does.

NEW QUESTION # 22
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 firewall filter to discard packets with incorrect TTL.
B. You can implement BGP GTSM between R2, R3, and R4
C. You can implement BGP GTSM between R2 and R1.
D. BGP GTSM requires a TTL of 255 to be configured between neighbors.
E. BGP GTSM requires a TTL of 1 to be configured between neighbors.

Answer: A,C,D

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

NEW QUESTION # 23
By default, which statement is correct about OSPF summary LSAs?

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

Answer: A

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 # 24
Which two statements are correct about a sham link? (Choose two.)

A. It creates a BGP multihop neighborship between two PE routers.
B. The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes
C. The PEs exchange Type 3 OSPF LSAs instead of Type 1 OSPF LSAs for the L3VPN routes.
D. It creates an OSPF multihop neighborship between two PE routers.

Answer: B,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 # 25
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. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy
B. 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
C. Add the external interface prefix to the IGP routing tables
D. Add the internal interface prefix to the BGP routing tables.

Answer: A,C

Explanation:
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.

NEW QUESTION # 26
Exhibit

CE-1 must advertise ten subnets to PE-1 using BGP Once CE-1 starts advertising the subnets to PE-1, the BGP peering state changes to Active.
Referring to the CLI output shown in the exhibit, which statement is correct?

A. The prefix limit has been reached on PE-1
B. CE-1 is unreachable
C. CE-1 is configured with an incorrect peer AS
D. CE-1 is advertising its entire routing table.

Answer: C

Explanation:
The problem in this scenario is that CE-1 is configured with an incorrect peer AS number for its BGP session with PE-1. The CLI output shows that CE-1 is using AS 65531 as its local AS number and AS 65530 as its peer AS number. However, PE-1 is using AS 65530 as its local AS number and AS 65531 as its peer AS number. This causes a mismatch in the BGP OPEN messages and prevents the BGP session from being established. To solve this problem, CE-1 should configure its peer AS number as 65530 under [edit protocols bgp group external] hierarchy level.

NEW QUESTION # 27
When building an interprovider VPN, you notice on the PE router that you have hidden routes which are received from your BGP peer with family inet labeled-unica3t configured.
Which parameter must you configure to solve this problem?

A. Under the family inet labeled-unicast hierarchy, add the resolve-vpn parameter.
B. Under the family inet labeled-unicast hierarchy, add the explicit null parameter.
C. Under the protocols mpls hierarchy, add the traffic-engineering parameter
D. Under the protocols ospf hierarchy, add the traffic-engineering parameter.

Answer: A

Explanation:
The resolve-vpn parameter is a BGP option that allows a router to resolve labeled VPN-IPv4 routes using unlabeled IPv4 routes received from another BGP peer with family inet labeled-unicast configured. This option enables interprovider VPNs without requiring MPLS labels between ASBRs or using VRF tables on ASBRs. In this scenario, you need to configure the resolve-vpn parameter under [edit protocols bgp group external family inet labeled-unicast] hierarchy level on both ASBRs.

NEW QUESTION # 28
Exhibit

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

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

Answer: A,D

Explanation:
Explanation
The configuration shown in the exhibit is for a Layer 3 VPN that connects customer sites that use different AS numbers. A Layer 3 VPN is a type of VPN that uses MPLS labels to forward packets across a provider network and BGP to exchange routing information between PE routers and CE routers. A Layer 3 VPN allows customers to use different routing protocols and AS numbers at their sites, as long as they can peer with BGP at the PE-CE interface. In this example, CE-1 is using AS 65530 and CE-2 is using AS 65531, but they can still communicate through the VPN because they have BGP sessions with PE-1 and PE-2, respectively.

NEW QUESTION # 29
Which origin code is preferred by BGP?

A. Incomplete
B. Null
C. External
D. Internal

Answer: A

Explanation:
Explanation
BGP uses several attributes to select the best path for a destination prefix. One of these attributes is origin, which indicates how BGP learned about a route. The origin attribute can have one of three values: IGP, EGP, or Incomplete. IGP means that the route was originated by a network or aggregate statement within BGP or by redistribution from an IGP into BGP. EGP means that the route was learned from an external BGP peer (this value is obsolete since BGP version 4). Incomplete means that the route was learned by some other means, such as redistribution from a static route into BGP. BGP prefers routes with lower origin values, so Incomplete is preferred over EGP, which is preferred over IGP.

NEW QUESTION # 30
When building an interprovider VPN, you notice on the PE router that you have hidden routes which are received from your BGP peer with family inet labeled-unica3t configured.
Which parameter must you configure to solve this problem?

A. Under the family inet labeled-unicast hierarchy, add the resolve-vpn parameter.
B. Under the family inet labeled-unicast hierarchy, add the explicit null parameter.
C. Under the protocols mpls hierarchy, add the traffic-engineering parameter
D. Under the protocols ospf hierarchy, add the traffic-engineering parameter.

Answer: A

Explanation:
Explanation
The resolve-vpn parameter is a BGP option that allows a router to resolve labeled VPN-IPv4 routes using unlabeled IPv4 routes received from another BGP peer with family inet labeled-unicast configured. This option enables interprovider VPNs without requiring MPLS labels between ASBRs or using VRF tables on ASBRs. In this scenario, you need to configure the resolve-vpn parameter under [edit protocols bgp group external family inet labeled-unicast] hierarchy level on both ASBRs.

NEW QUESTION # 31
Exhibit

Referring to the exhibit, what do the brackets [ ] in the AS path identify?

A. They identify the local AS number associated with the AS path if configured on the router, or if AS path prepending is configured
B. They identify that the autonomous system number is incomplete and awaiting more information from the BGP protocol.
C. They identify that a BGP confederation is being used to ensure that there are no routing loops.
D. They identify an AS set, which are groups of AS numbers in which the order does not matter

Answer: D

Explanation:
The brackets [ ] in the AS path identify an AS set, which are groups of AS numbers in which the order does not matter. An AS set is used when BGP aggregates routes from different ASs into a single prefix. For example, if BGP aggregates routes 10.0.0.0/16 and 10.1.0.0/16 from AS 100 and AS 200, respectively, into a single prefix 10.0.0.0/15, then the AS path for this prefix will be [100 200]. An AS set reduces the length of the AS path and prevents routing loops.

NEW QUESTION # 32
Exhibit

You want Site 1 to access three VLANs that are located in Site 2 and Site 3 The customer-facing interface on the PE-1 router is configured for Ethernet-VLAN encapsulation.
What is the minimum number of L2VPN routing instances to be configured to accomplish this task?

A. 0
B. 1
C. 2
D. 3

Answer: A

Explanation:
Explanation
To allow Site 1 to access three VLANs that are located in Site 2 and Site 3, you need to configure three L2VPN routing instances on PE-1, one for each VLAN. Each L2VPN routing instance will have a different VLAN ID and a different VNI for VXLAN encapsulation. Each L2VPN routing instance will also have a different vrf-target export value to identify which VPN routes belong to which VLAN. This way, PE-1 can forward traffic from Site 1 to Site 2 and Site 3 based on the VLAN tags and VNIs.

NEW QUESTION # 33
Exhibit

The network shown in the exhibit is based on IS-IS
Which statement is correct in this scenario?

A. The routers are using unnumbered interfaces
B. The NSEL byte for Area 0001 is 00.
C. The area address is two bytes.
D. The system IDofR1_2 is 192.168.16.1

Answer: B

Explanation:
IS-IS is an interior gateway protocol that uses link-state routing to exchange routing information among routers within a single autonomous system. IS-IS uses two types of addresses to identify routers and areas:
system ID and area address. The system ID is a unique identifier for each router in an IS-IS domain. The system ID is 6 octets long and can be derived from the MAC address or manually configured. The area address is a variable-length identifier for each area in an IS-IS domain. The area address can be 1 to 13 octets long and is composed of high-order octets of the address. An IS-IS instance may be assigned multiple area addresses, which are considered synonymous. Multiple synonymous area addresses are useful when merging or splitting areas in the domain1. In this question, we have a network based on IS-IS with four routers (R1_1, R1_2, R2_1, and R2_2) belonging to area 0001. The area address for area 0001 is 49.0001. The NSEL byte for area 0001 is the last octet of the address, which is 01. The NSEL byte stands for Network Service Access Point Selector (NSAP Selector) and indicates the type of service requested from the network layer2. Therefore, the correct statement in this scenario is that the NSEL byte for area 0001 is 01.
References: 1:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/configuration/xe-16/irs-xe-16-book/irs-ovrvw-cf.
2:
https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/concept/is-is-routing-overview.html

NEW QUESTION # 34
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. Source2 will use RP1 and Receiver2 will use RP1 for group 224.2.2.2.
B. Source1 will use RP1 and Receiver1 will use RP2 for group 224.1 1 1
C. Source1 will use RP1 and Receiver1 will use RP1 for group 224.1.1.1.
D. Source2 will use RP2 and Received will use RP2 for group 224.2.2.2.

Answer: C,D

NEW QUESTION # 35
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 BA classifier first, then the MF classifier.
B. The packet will be discarded.
C. The packet will be processed by the MF classifier first, then the BA classifier.
D. The packet will be forwarded with no classification changes.

Answer: D

Explanation:
Explanation
behavior aggregate (BA) classifiers and multifield (MF) classifiers are two types of classifiers that are used to assign packets to a forwarding class and a loss priority based on different criteria. The forwarding class determines the output queue for a packet. The loss priority is used by a scheduler to control packet discard during periods of congestion.
A BA classifier maps packets to a forwarding class and a loss priority based on a fixed-length field in the packet header, such as DSCP, IP precedence, MPLS EXP, or IEEE 802.1p CoS bits. A BA classifier is computationally efficient and suitable for core devices that handle high traffic volumes. A BA classifier is useful if the traffic comes from a trusted source and the CoS value in the packet header is trusted.
An MF classifier maps packets to a forwarding class and a loss priority based on multiple fields in the packet header, such as source address, destination address, protocol type, port number, or VLAN ID. An MF classifier is more flexible and granular than a BA classifier and can match packets based on complex filter rules. An MF classifier is suitable for edge devices that need to classify traffic from untrusted sources or rewrite packet headers.
You can configure both a BA classifier and an MF classifier on an interface. If you do this, the BA classification is performed first and then the MF classification. If the two classification results conflict, the MF classification result overrides the BA classification result.
Based on this information, we can infer the following statements:
* The packet will be discarded. This is not correct because the packet will not be discarded by the classifiers unless it matches a filter rule that specifies discard as an action. The classifiers only assign packets to a forwarding class and a loss priority based on their match criteria.
* The packet will be processed by the BA classifier first, then the MF classifier. This is correct because if both a BA classifier and an MF classifier are configured on an interface, the BA classification is performed first and then the MF classification. If they conflict, the MF classification result overrides the BA classification result.
* The packet will be forwarded with no classification changes. This is not correct because the packet will be classified by both the BA classifier and the MF classifier if they are configured on an interface. The final classification result will determine which output queue and which discard policy will be applied to the packet.
* The packet will be processed by the MF classifier first, then the BA classifier. This is not correct because if both a BA classifier and an MF classifier are configured on an interface, the BA classification is performed first and then the MF classification. If they conflict, the MF classification result overrides the BA classification result.

NEW QUESTION # 36
Which statement is true regarding BGP FlowSpec?

A. It uses a remote triggered black hole to protect a network from a denial-of-service attack.
B. It uses dynamically created routing policies to protect a network from denial-of-service attacks
C. It is used to protect a network from denial-of-service attacks dynamically
D. It verifies that the source IP of the incoming packet has a resolvable route in the routing table

Answer: B

Explanation:
BGP FlowSpec is a feature that extends the Border Gateway Protocol (BGP) to enable routers to exchange traffic flow specifications, allowing for more precise control of network traffic. The BGP FlowSpec feature enables routers to advertise and receive information about specific flows in the network, such as those originating from a particular source or destined for a particular destination. Routers can then use this information to construct traffic filters that allow or deny packets of a certain type, rate limit flows, or perform other actions1. BGP FlowSpec can also help in filtering traffic and taking action against distributed denial of service (DDoS) attacks by dropping the DDoS traffic or diverting it to an analyzer2. BGP FlowSpec rules are internally converted to equivalent Cisco Common Classification Policy Language (C3PL) representing corresponding match and action parameters2. Therefore, BGP FlowSpec uses dynamically created routing policies to protect a network from denial-of-service attacks.
References: 1: https://www.networkingsignal.com/what-is-bgp-flowspec/ 2:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-flowspe

NEW QUESTION # 37
Which two statements are correct about the customer interface in an LDP-signaled pseudowire? (Choose two)

A. When the encapsulation is vlan-ccc or extended-vlan-ccc, the configured VLAN tag is not included in the control plane LDP advertisement
B. When the encapsulation is ethemet-ccc, tagged and untagged frames are both accepted in the data plane.
C. When the encapsulation is ethernet-ccc, only frames without a VLAN tag are accepted in the data plane
D. When the encapsulation is vLan-ccc or extended-vlan-ccc, the configured VLAN tag is included in the control plane LDP advertisement

Answer: B,D

Explanation:
The customer interface in an LDP-signaled pseudowire is the interface on the PE router that connects to the CE device. An LDP-signaled pseudowire is a type of Layer 2 circuit that uses LDP to establish a point-to-point connection between two PE routers over an MPLS network. The customer interface can have different encapsulation types depending on the type of traffic that is carried over the pseudowire. The encapsulation types are ethernet-ccc, vlan-ccc, extended-vlan-ccc, atm-ccc, frame-relay-ccc, ppp-ccc, cisco-hdlc-ccc, and tcc-ccc. Depending on the encapsulation type, the customer interface can accept or reject tagged or untagged frames in the data plane, and include or exclude VLAN tags in the control plane LDP advertisement. The following table summarizes the behavior of different encapsulation types:

NEW QUESTION # 38
Exhibit

R2 is receiving the same route from R1 and R3. You must ensure that you can load balance traffic for that route.
Referring to the exhibit, which configuration change will allow load balancing?

A. Apply the prepend policy as an import policy under group R1.
B. Configure the multipath multiple-as parameter under the global BGP configuration.
C. Apply the prepend policy as an import policy under group R3.
D. Configure the multipath parameter under the global BGP configuration.

Answer: B

NEW QUESTION # 39
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. LDP Layer 2 circuit
B. translational cross-connect
C. BGP Layer 2 VPN
D. circuit cross-connect

Answer: A

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 # 40
A packet is received on an interface configured with transmission scheduling. One of the configured queues In this scenario, which two actions will be taken by default on a Junos device? (Choose two.)

A. The excess traffic will be discarded
B. The exceeding queue will be considered to have positive bandwidth credit
C. The excess traffic will use bandwidth available from other queueses
D. The exceeding queue will be considered to have negative bandwidth credit.

Answer: A,D

Explanation:
Explanation
Transmission scheduling is a CoS feature that allows you to allocate bandwidth among different queues on an interface. Each queue has a configured bandwidth percentage that determines how much of the available bandwidth it can use. If a queue exceeds its allocated bandwidth, it is considered to have negative bandwidth credit and its excess traffic will be discarded by default. If a queue does not use all of its allocated bandwidth, it is considered to have positive bandwidth credit and its unused bandwidth can be shared by other queues.

NEW QUESTION # 41
Exhibit

Referring to the exhibit, you are receiving the 192.168 0 0/16 route on both R3 and R4 from your EBGP neighbor You must ensure that R1 and R2 receive both BGP routes from the route reflector In this scenario, which BGP feature should you configure to accomplish this behavior?

A. add-path
B. multipath
C. route-target
D. multihop

Answer: A

Explanation:
BGP add-path is a feature that allows the advertisement of multiple paths through the same peering session for the same prefix without the new paths implicitly replacing any previous paths. This behavior promotes path diversity and reduces multi-exit discriminator (MED) oscillations. BGP add-path is implemented by adding a path identifier to each path in the NLRI. The path identifier can be considered as something similar to a route distinguisher in VPNs, except that a path ID can apply to any address family. Path IDs are unique to a peering session and are generated for each network3. In this question, we have a route reflector (RR) that receives two routes for the same prefix (192.168.0.0/16) from an EBGP neighbor. By default, the RR will only advertise its best path to its clients (R1 and R2). However, we want R1 and R2 to receive both routes from the RR. To achieve this, we need to configure BGP add-path on the RR and enable it to send multiple paths for the same prefix to its clients.

NEW QUESTION # 42
In IS-IS, which two statements are correct about the designated intermediate system (DIS) on a multi-access network segment? (Choose two)

A. A router with a priority of 10 wins the DIS election over a router with a priority of 1.
B. On the multi-access network, each router only forms an adjacency to the DIS.
C. A router with a priority of 1 wins the DIS election over a router with a priority of 10.
D. On the multi-access network, each router forms an adjacency to every other router on the segment

Answer: A,B

Explanation:
Explanation
In IS-IS, a designated intermediate system (DIS) is a router that is elected on a multi-access network segment (such as Ethernet) to perform some functions on behalf of other routers on the same segment. A DIS is responsible for sending network link-state advertisements (LSPs), which describe all the routers attached to the network. These LSPs are flooded throughout a single area. A DIS also generates pseudonode LSPs, which represent the multi-access network as a single node in the link-state database. A DIS election is based on the priority value configured on each router's interface connected to the multi-access network. The priority value ranges from 0 to 127, with higher values indicating higher priority. The router with the highest priority becomes the DIS for the area (Level 1, Level 2, or both). If routers have the same priority, then the router with the highest MAC address is elected as the DIS. By default, routers have a priority value of 64. On a multi-access network, each router only forms an adjacency to the DIS, not to every other router on the segment. This reduces the amount of hello packets and LSP

NEW QUESTION # 43
......

Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Certification Exam is a comprehensive test of a candidate's knowledge, skills, and abilities in service provider routing and switching technologies. Service Provider, Professional (JNCIP-SP) certification is highly regarded in the industry and can greatly enhance an individual's career prospects in the networking field.

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JN0-664 Practice Exams and Training Solutions for Certifications [Q20-Q43]

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