Verified JN0-664 Exam Dumps PDF [2024] Access using Prep4away
Try Best JN0-664 Exam Questions from Training Expert Prep4away
The JN0-664 exam is a comprehensive assessment that covers a wide range of topics such as OSPF, IS-IS, BGP, MPLS, LDP, RSVP-TE, and more. Candidates are expected to have a deep understanding of the service provider network architecture, including core, edge, and access networks. They must also be familiar with advanced service provider technologies such as virtualization, automation, and software-defined networking.
NEW QUESTION # 35
Exhibit
You are attempting to summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500. You implement the export policy shown in the exhibit and all routes from the routing table stop being advertised.
In this scenario, which two steps would you take to summarize the route in BGP? (Choose two.)
- A. Add the set protocols bgp family inet unicast add-path command to allow additional routes to the RIB tables. -
- B. Remove the from protocol bgp command from the export policy.
- C. Replace exact in the export policy with orlonger.
- D. Add the set routing-options static route 203.0.113.123/25 discard command.
Answer: C,D
Explanation:
Explanation
To summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500, you need to do the following:
* Add the set routing-options static route 203.0.113.128/25 discard command. This creates a static route for the summary prefix and discards any traffic destined to it. This is necessary because BGP can only advertise routes that are present in the routing table.
* Replace exact in the export policy with orlonger. This allows R8 to match and advertise any route that is equal or more specific than the summary prefix. The exact term only matches routes that are exactly equal to the summary prefix, which is not present in the routing table.
NEW QUESTION # 36
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 RR
- B. Configure the resolution rib bgp . 13vpn . 0 resolution-ribs inet. 0 Statement on the PEs.
- C. Configure the resolution rib bgp.l3vpn.O resolution-ribs inet. 0 Statement on the RR
- D. Configure the family route-target statement on the PEs.
Answer: A,C
Explanation:
Explanation
BGP route target filtering is a technique that reduces the number of routers that receive VPN routes and route updates, helping to limit the amount of overhead associated with running a VPN. BGP route target filtering is based on the exchange of the route-target address family, which contains information about the VPN membership of each PE device. Based on this information, a PE device can decide whether to accept or reject VPN routes from another PE device.
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.
* Configure an export policy for BGP route target filtering under the routing-options configuration on the RRs. This policy controls which route targets are advertised to each PE device based on their VPN membership.
NEW QUESTION # 37
Which two statements are correct about a sham link? (Choose two.)
- A. It creates an OSPF multihop neighborship between two PE routers.
- B. It creates a BGP multihop neighborship between two PE routers.
- C. The PEs exchange Type 3 OSPF LSAs instead of Type 1 OSPF LSAs for the L3VPN routes.
- D. The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes
Answer: A,D
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. 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 # 38
In which two ways does OSPF prevent routing loops in multi-area networks? (Choose two.)
- A. All areas are required to connect as a full mesh.
- B. The SPF algorithm prunes looped paths within an area.
- C. All areas are required to connect to area 0.
- D. The LFA algorithm prunes all looped paths within an area.
Answer: B,C
Explanation:
Explanation
OSPF is an interior gateway protocol that uses link-state routing to exchange routing information among routers within a single autonomous system. OSPF prevents routing loops in multi-area networks by using two methods: area hierarchy and SPF algorithm. Area hierarchy is the concept of dividing a large OSPF network into smaller areas that are connected to a backbone area (area 0). This reduces the amount of routing information that each router has to store and process, and also limits the scope of link-state updates within each area. All areas are required to connect to area 0 either directly or through virtual links2. SPF algorithm is the method that OSPF uses to calculate the shortest path to each destination in the network based on link-state information. The SPF algorithm runs on each router and builds a shortest-path tree that represents the topology of the network from the router's perspective. The SPF algorithm prunes looped paths within an area by choosing only one best path for each destination3.
References: 2:
https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/concept/ospf-area-overview.html 3:
https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/concept/ospf-spf-algorithm-overview.ht
NEW QUESTION # 39
Exhibit
Referring to the exhibit, a working L3VPN exists that connects VPN-A sites CoS is configured correctly to match on the MPLS EXP bits of the LSP, but when traffic is sent from Site-1 to Site-2, PE-2 is not classifying the traffic correctly What should you do to solve the problem?
- A. Configure the explicit-null statement on PE-1.
- B. Set a static CoS value for the PE-1_to_PE-2 LSP
- C. Configure the explicit-null statement on PE-2
- D. Configure VPN prefix mapping for the PE-1_to_PE-2 LSP
Answer: A
Explanation:
Explanation
The explicit-null statement enables the PE router to send an MPLS label with a value of 0 (explicit null) instead of an IP header for packets destined to the VPN customer sites. This allows the penultimate hop router (the router before the egress PE router) to preserve the EXP bits of the MPLS label and pass them to the egress PE router. The egress PE router can then use these EXP bits to classify the traffic according to the CoS policy2
. In this example, PE-1 should configure the explicit-null statement under [edit protocols mpls label-switched-path PE-1_to_PE-2] hierarchy level.
NEW QUESTION # 40
Which statement is correct about IS-IS when it performs the Dijkstra algorithm?
- A. The local router moves its own local tuples into the candidate database
- B. Tuples with the lowest cost are moved from the tree database to the LSDB.
- C. When a new neighbor ID in the tree database matches a router ID in the LSDB, the neighbor ID is moved to the candidate database
- D. The algorithm will stop processing once the tree database is empty.
Answer: A
Explanation:
Explanation
IS-IS is a link-state routing protocol that uses the Dijkstra algorithm to compute the shortest paths between nodes in a network. The Dijkstra algorithm maintains three data structures: a tree database, a candidate database, and a link-state database (LSDB). The tree database contains the nodes that have been visited and their shortest distances from the source node. The candidate database contains the nodes that have not been visited yet and their tentative distances from the source node. The LSDB contains the topology information of the network, such as the links and their costs.
The Dijkstra algorithm works as follows:
* The local router moves its own local tuples into the tree database. A tuple consists of a node ID, a distance, and a parent node ID. The local router's tuple has a distance of zero and no parent node.
* The local router moves its neighbors' tuples into the candidate database. The neighbors' tuples have distances equal to the costs of the links to them and parent node IDs equal to the local router's node ID.
* The local router selects the tuple with the lowest distance from the candidate database and moves it to the tree database. This tuple becomes the current node.
* The local router updates the distances of the current node's neighbors in the candidate database by adding the current node's distance to the link costs. If a shorter distance is found, the parent node ID is also updated.
* The algorithm repeats steps 3 and 4 until either the destination node is reached or the candidate database is empty.
NEW QUESTION # 41
Exhibit
You are running a service provider network and must transport a customer's IPv6 traffic across your IPv4-based MPLS network using BGP You have already configured mpis ipv6-tunneling on your PE routers.
Which two statements are correct about the BGP configuration in this scenario? (Choose two.)
- A. You must configure family inet6 add-path between PE and CE routers.
- B. You must configure family inet6 unicast between PE routers
- C. You must configure family inet6 labcled-unicast between PE routers.
- D. You must configure family inet6 unicaat between PE and CE routers.
Answer: C,D
Explanation:
Explanation
To transport IPv6 traffic over an IPv4-based MPLS network using BGP, you need to configure two address families: family inet6 labeled-unicast and family inet6 unicast. The former is used to exchange IPv6 routes with MPLS labels between PE routers, and the latter is used to exchange IPv6 routes without labels between PE and CE routers. The mpis ipv6-tunneling command enables the PE routers to encapsulate the IPv6 packets with an MPLS label stack and an IPv4 header before sending them over the MPLS network.
NEW QUESTION # 42
Exhibit
Referring to the exhibit, which three statements are correct about route 10 0 0.0/16 when using the default BGP advertisement rules'? (Choose three.)
- A. R4 will advertise 10 0.0 0/16 to R6 with 172.16 1 1 as the next hop
- B. R1 will advertise 10.0.0.0/16 to R2 with 192 168 1 1 as the next hop.
- C. R1 will prepend AS 65531 when advertising 10 0.0 0/16 to R2.
- D. R2 will advertise 10.0.0.0/16 to R3 with 192.168.1 1 as the next hop
- E. R2 will advertise 10.0.0.0/16 to R4 with 172.16.1.1 as the next hop
Answer: A,B,E
Explanation:
Explanation
The problem in this scenario is that R1 and R8 are not receiving each other's routes because of private AS numbers in the AS path. Private AS numbers are not globally unique and are not advertised to external BGP peers. To solve this problem, you need to do the following:
* Configure loops on routers in AS 65412 and advertise-peer-as on routers in AS 64498. This allows R5 and R6 to advertise their own AS number (65412) instead of their peer's AS number (64498) when sending updates to R7 and R8. This prevents a loop detection issue that would cause R7 and R8 to reject the routes from R5 and R62
* Configure remove-private on advertisements from AS 64497 toward AS 64498 and from AS 64500 toward AS 64499. This removes any private AS numbers from the AS path before sending updates to external BGP peers. This allows R2 and R3 to receive the routes from R1 and R4, respectively3.
NEW QUESTION # 43
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 2 route distinguisher.
- B. The information shows a Type 1 route distinguisher.
- C. The information shows a Type 0 route distinguisher
- D. The information shows a route target
Answer: C
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 # 44
Exhibit
Referring to the exhibit, which statement is true?
- A. The 10.101.1.0/24 route will only be shared if BGP is configured in the routing instance
- B. The 10.101.1.0/24 route will be shared if the vrf-table-label parameter is configured.
- 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:
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 # 45
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 only supports IPv4.
- C. OSPFv3 supports IPv4 only on interfaces with family inet6 defined
- D. OSPFv3 is not backward compatible with IPv4
Answer: D
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 # 46
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. BGP GTSM requires a TTL of 255 to be configured between neighbors.
- C. You can implement BGP GTSM between R2 and R1.
- D. You can implement BGP GTSM between R2, R3, and R4
- E. BGP GTSM requires a TTL of 1 to be configured between neighbors.
Answer: B,D,E
Explanation:
Explanation
BGP GTSM is a technique that protects a BGP session by comparing the TTL value in the IP header of incoming BGP packets against a valid TTL range. If the TTL value is within the valid TTL range, the packet is accepted. If not, the packet is discarded. The valid TTL range is from 255 - the configured hop count + 1 to
255. When GTSM is configured, the BGP packets sent by the device have a TTL of 255. GTSM provides best protection for directly connected EBGP sessions, but not for multihop EBGP or IBGP sessions because the TTL of packets might be modified by intermediate devices.
In the exhibit, we can see that R2, R3, and R4 are in the same AS (AS 20) and R1 is in a different AS (AS 10).
Based on this information, we can infer the following statements:
* You can implement BGP GTSM between R2, R3, and R4. This is not correct because R2, R3, and R4 are IBGP peers and GTSM does not provide effective protection for IBGP sessions. The TTL of packets between IBGP peers might be changed by intermediate devices or routing protocols.
* BGP GTSM requires a firewall filter to discard packets with incorrect TTL. This is not correct because BGP GTSM does not require a firewall filter to discard packets with incorrect TTL. BGP GTSM uses TCP option 19 to negotiate GTSM capability between peers and uses TCP option 20 to carry the expected TTL value in each packet. The receiver checks the expected TTL value against the actual TTL value and discards packets with incorrect TTL values.
* You can implement BGP GTSM between R2 and R1. This is correct because R2 and R1 are EBGP peers and GTSM provides effective protection for directly connected EBGP sessions. The TTL of packets between directly connected EBGP peers is not changed by intermediate devices or routing protocols.
* BGP GTSM requires a TTL of 1 to be configured between neighbors. This is not correct because BGP GTSM requires a TTL of 255 to be configured between neighbors. The sender sets the TTL of packets to 255 and the receiver expects the TTL of packets to be 255 minus the configured hop count.
* BGP GTSM requires a TTL of 255 to be configured between neighbors. This is correct because BGP GTSM requires a TTL of 255 to be configured between neighbors. The sender sets the TTL of packets to 255 and the receiver expects the TTL of packets to be 255 minus the configured hop count.
NEW QUESTION # 47
Exhibit
Referring to the exhibit, which two statements are true? (Choose two.)
- A. This is an EVPN Type-2 route.
- B. This route is learned through EBGP
- C. The device advertising this route into EVPN is 192.168.101.5.
- D. The devices advertising this route into EVPN are 10 0 2 12 and 10.0.2.22.
Answer: A,C
Explanation:
Explanation
This is an EVPN Type-2 route, also called a MAC/IP advertisement route, that is used to advertise host IP and MAC address information to other VTEPs in an EVPN network. The route type field in the EVPN NLRI has a value of 2, indicating a Type-2 route. The device advertising this route into EVPN is 192.168.101.5, which is the IP address of the VTEP that learned the host information from the local CE device. This IP address is carried in the MPLS label field of the route as part of the VXLAN encapsulation.
NEW QUESTION # 48
Exhibit
Based on the configuration contents shown in the exhibit, which statement is true?
- A. Joins for any group are accepted if the group count value is less than 25.
- B. Joins for group 224.7.7.7 are accepted if the group count 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: B
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 # 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 resolve-vpn parameter.
- B. Under the protocols ospf hierarchy, add the traffic-engineering parameter.
- C. Under the family inet labeled-unicast hierarchy, add the explicit null parameter.
- D. Under the protocols mpls 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 # 50
......
Juniper JN0-664 exam is a written exam and consists of 65 multiple-choice questions. The candidate has 120 minutes to complete the exam. JN0-664 exam is available in English and is administered worldwide by Pearson VUE. The passing score for the exam is 65%.
Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Certification Exam is a professional-level certification exam offered by Juniper Networks. JN0-664 exam is designed for networking professionals who have a solid understanding of networking technologies and are looking to further enhance their skills in the service provider environment. The JN0-664 exam is a comprehensive test that covers a wide range of topics including routing protocols, MPLS, L2VPN, L3VPN, multicast, and other service provider technologies.
Latest 100% Passing Guarantee - Brilliant JN0-664 Exam Questions PDF: https://testking.vcetorrent.com/JN0-664-valid-vce-torrent.html