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Passing the JN0-664 exam is a key step towards becoming a certified Juniper Networks professional. It demonstrates to employers and clients that the candidate has the knowledge and skills to design, configure, and troubleshoot complex service provider networks using Juniper Networks technology.
Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Exam is a professional-level certification exam designed for individuals who want to demonstrate their advanced skills in service provider routing and switching technologies. JN0-664 exam is intended for network professionals who have a solid understanding of Juniper Networks technology and are looking to advance their knowledge and skills to the next level.
NEW QUESTION # 36
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?
- A. Create an OSPF sham link between the PE routers.
- B. Configure the OSPF metric on the backup intra-area link that is higher than the L3VPN link.
- C. Enable OSPF traffic-engineering.
- D. Configure an import routing policy on the CE routers that rejects OSPF routes learned on the backup intra-area link.
Answer: A
Explanation:
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.
NEW QUESTION # 37
Exhibit
You are examining an L3VPN route that includes the information shown in the exhibit Which statement is correct in this scenario?
- A. The information shows a Type 1 route distinguisher.
- B. The information shows a Type 0 route distinguisher
- C. The information shows a route target
- D. The information shows a Type 2 route distinguisher.
Answer: A
Explanation:
Type 1: When Type value is 1, the Administrator field is 4-bytes and Assigned Number field is 2-bytes. The Administrator field should be set to the IP address (public IP addresses should be used). The Assigned Number field contains a number from a numbering space that is administered by the enterprise to which the IP address has been assigned by the appropriate authority.
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. Configure the multipath multiple-as parameter under the global BGP configuration.
- B. Apply the prepend policy as an import policy under group R3.
- C. Configure the multipath parameter under the global BGP configuration.
- D. Apply the prepend policy as an import policy under group R1.
Answer: A
NEW QUESTION # 39
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: B
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 # 40
Which two statements are correct about reflecting inet-vpn unicast prefixes in BGP route reflection? (Choose two.)
- A. Clients add their originator ID when advertising routes to their route reflector
- B. Route reflectors add their cluster ID to the AS path when readvertising client routes.
- C. Route reflectors do not change any existing BGP attributes by default when advertising routes.
- D. A BGP peer does not require any configuration changes to become a route reflector client.
Answer: C,D
Explanation:
Explanation
Route reflection is a BGP feature that allows a router to reflect routes learned from one IBGP peer to another IBGP peer, without requiring a full-mesh IBGP topology. Route reflectors do not change any existing BGP attributes by default when advertising routes, unless explicitly configured to do so. A BGP peer does not require any configuration changes to become a route reflector client, only the route reflector needs to be configured with the client parameter under [edit protocols bgp group group-name neighbor neighbor-address] hierarchy level.
NEW QUESTION # 41
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 exceeding queue will be considered to have negative bandwidth credit.
- B. The excess traffic will use bandwidth available from other queueses
- C. The exceeding queue will be considered to have positive bandwidth credit
- D. The excess traffic will be discarded
Answer: A,D
Explanation:
https://www.juniper.net/documentation/us/en/software/junos/cos-security-devices/topics/concept/cos-transmissio
NEW QUESTION # 42
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.)
- A. Configure the family route-target statement on the PEs.
- B. Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the RR.
- C. Configure the family route-target statement on the RR.
- D. Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the PEs.
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.
NEW QUESTION # 43
Exhibit
You are asked to exchange routes between R1 and R4 as shown in the exhibit. These two routers use the same AS number Which two steps will accomplish this task? (Choose two.)
- A. Configure the BGP group with the advertise-peer-as parameter on R1 and R4.
- B. Configure the BGP group with the advertise-peer-as parameter on R2 and R3.
- C. Configure the BGP group with the as-override parameter on R2 and R3
- D. Configure the BGP group with the as-override parameter on R1 and R4
Answer: A,C
Explanation:
Explanation
The advertise-peer-as parameter allows a router to advertise its peer's AS number as part of the AS path attribute when sending BGP updates to other peers. This parameter is useful when two routers in the same AS need to exchange routes through another AS, such as in the case of R1 and R4. By configuring this parameter on R1 and R4, they can advertise each other's AS number to R2 and R3, respectively.
The as-override parameter allows a router to replace the AS number of its peer with its own AS number when receiving BGP updates from that peer. This parameter is useful when two routers in different ASes need to exchange routes through another AS that has the same AS number as one of them, such as in the case of R2 and R3. By configuring this parameter on R2 and R3, they can override the AS number of R1 and R4 with their own AS number when sending BGP updates to each other.
NEW QUESTION # 44
In IS-IS, which two statements are correct about the designated intermediate system (DIS) on a multi-access network segment? (Choose two)
- A. On the multi-access network, each router forms an adjacency to every other router on the segment
- 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. A router with a priority of 10 wins the DIS election over a router with a priority of 1.
Answer: B,D
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 # 45
Exhibit
Based on the configuration contents shown in the exhibit, which statement is true?
- A. Joins for group 224.7.7.7 are accepted if the group count is less than 25
- B. Joins for any group are accepted if the group count value is less than 25.
- C. Joins for group 224.7.7.7 are always rejected, regardless of the group count.
- D. Joins for group 224.7.7.7 are rejected if the source address is 192.168.100.10
Answer: A
Explanation:
Explanation
BGP policy framework is a set of tools that allows you to control the flow of routing information and apply routing policies based on various criteria. BGP policy framework consists of several components, such as route maps, prefix lists, community lists, AS path lists, and route filters. Route maps are used to define routing policies by matching certain conditions and applying certain actions. Prefix lists are used to filter routes based on their prefixes. Community lists are used to filter routes based on their community attributes. AS path lists are used to filter routes based on their AS path attributes. Route filters are used to filter routes based on their prefix length or range3. In this question, we have a route map named ISP-A that has two clauses: clause 10 and clause 20. Clause 10 matches any route with a prefix length between 8 and 24 bits and sets the local preference to 200. Clause 20 matches any route with a prefix of 224.7.7.7/32 and rejects it. The route map is applied inbound on the BGP neighborship with ISP-A. Based on this configuration, the correct statement is that joins for group 224.7.7.7 are always rejected, regardless of the group count. This is because clause 20 explicitly denies any route with a prefix of 224.7.7.7/32, which corresponds to the multicast group 224.7.7.7.
NEW QUESTION # 46
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. multihop
- C. multipath
- D. route-target
Answer: A
Explanation:
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 # 47
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 -> CE-1 -> PE-1 -> GW-1.
- B. You must use RIB groups to leak routes between the inet. o and vpn-a. inet. o tables.
- C. RIB groups are not needed to leak routes between the inet. 0 and VPN-A. inet. 0 tables,
- D. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> GW-1.
Answer: A,B
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 # 48
Which two statements describe PIM-SM? (Choose two)
- A. Routers without receivers must periodically prune themselves from the SPT.
- B. Traffic is initially flooded to all routers and an S,G is maintained for each group
- C. Routers with receivers send join messages to their upstream neighbors.
- D. Traffic is only forwarded to routers that request to join the distribution tree.
Answer: C,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 # 49
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 explicit null parameter.
- B. Under the protocols ospf hierarchy, add the traffic-engineering parameter.
- C. Under the family inet labeled-unicast hierarchy, add the resolve-vpn parameter.
- D. Under the protocols mpls hierarchy, add the traffic-engineering parameter
Answer: C
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 # 50
Exhibit.
Referring to the exhib.t, what must be changed to establish a Level 1 adjacency between routers R1 and R2?
- A. Change the level l disable parameter under the R1 protocols isis interface lo0.0 hierarchy to the level 2 disable parameter.
- B. Remove the level i disable parameter under the R2 protocols isis interface loo . 0 configuration hierarchy.
- C. Add IP addresses to the interface ge-l/2/3 unit 0 family iso hierarchy on both R1 and R2.
- D. Change the level 1 disable parameter under the R2 protocols isis interface ge-1/2/3 .0 hierarchy to the level 2 disable parameter
Answer: B
Explanation:
IS-IS routers can form Level 1 or Level 2 adjacencies depending on their configuration and network topology.
Level 1 routers are intra-area routers that share the same area address with their neighbors. Level 2 routers are inter-area routers that can connect different areas. Level 1-2 routers are both intra-area and inter-area routers that can form adjacencies with any other router.
In the exhibit, R1 and R2 are in different areas (49.0001 and 49.0002), so they cannot form a Level 1 adjacency. However, they can form a Level 2 adjacency if they are both configured as Level 1-2 routers. R1 is already configured as a Level 1-2 router, but R2 is configured as a Level 1 router only, because of the level 1 disable command under the lo0.0 interface. This command disables Level 2 routing on the loopback interface, which is used as the router ID for IS-IS.
Therefore, to establish a Level 1 adjacency between R1 and R2, the level 1 disable command under the R2 protocols isis interface lo0.0 hierarchy must be removed. This will enable Level 2 routing on R2 and allow it to form a Level 2 adjacency with R1.
NEW QUESTION # 51
Exhibit
You are examining an L3VPN route that includes the information shown in the exhibit Which statement is correct in this scenario?
- A. The information shows a Type 0 route distinguisher
- B. The information shows a Type 1 route distinguisher.
- C. The information shows a route target
- D. The information shows a Type 2 route distinguisher.
Answer: A
Explanation:
Explanation
The information shows a Type 0 route distinguisher, which is one of the three types of route distinguishers defined by RFC 4364. A route distinguisher is a 64-bit value that is prepended to an IPv4 address to create a VPN-IPv4 address, which is unique within a VPN routing and forwarding (VRF) table. A Type 0 route distinguisher has two fields: an administrator subfield (2 bytes) and an assigned number subfield (6 bytes). The administrator subfield can be an AS number or an IP address, and the assigned number subfield can be any value assigned by the administrator. In this example, the administrator subfield is 65530 (an AS number) and the assigned number subfield is 1.
NEW QUESTION # 52
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