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NEW QUESTION # 11
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 unicast between PE and CE routers.
- B. You must configure family inet6 unicast between PE routers.
- C. You must configure family inet6 labeled-unicast between PE routers.
- D. You must configure family inet6 add-path between PE and CE routers.
Answer: A,C
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 # 12
Exhibit
R1 and R8 are not receiving each other's routes
Referring to the exhibit, what are three configuration commands that would solve this problem? (Choose three.)
- A. Configure loops and advertise-peer-as on routers in AS 64497 and AS 64450.
- B. Configure remove-private on advertisements from AS 64500 toward AS 64499.
- C. Configure loops on routers in AS 65412 and advertise-peer-as on routers in AS 64498.
- D. Configure remove-private on advertisements from AS 64497 toward AS 64498.
- E. Configure as-override on advertisement from AS 64500 toward AS 64512.
Answer: B,D,E
NEW QUESTION # 13
Exhibit
Referring to the exhibit, CE-1 is providing NAT services for the hosts at Site 1 and you must provide Internet access for those hosts Which two statements are correct in this scenario? (Choose two.)
- A. You must configure a RIB group on PE-1 to leak the 10 1 2.0/24 prefix from the VPN-A.inet.0 table to the inet.0 table.
- B. You must configure a RIB group on PE-1 to leak a default route from the inet.0 table to the VPN-A.inet.
0 table. - C. You must configure a static route in the main routing instance for the 10 1 2.0/24 prefix that uses the VPN-A.inet.0 table as the next hop
- D. You must configure a static route in the main routing instance for the 203.0.113.1/32 prefix that uses the VPN-A.inet.0 table as the next hop.
Answer: B,D
NEW QUESTION # 14
Which two statements about IS-IS are correct? (Choose two.)
- A. CSNPs are used to acknowledge a received LSP.
- B. CSNPs are used to request a missing LSP.
- C. PSNPs are used to acknowledge a received LSP.
- D. PSNPs are used to request a missing LSP.
Answer: C,D
NEW QUESTION # 15
Exhibit
Which two statements about the configuration shown in the exhibit are correct? (Choose two.)
- A. This VPN connects customer sites that use the same AS number
- B. This VPN connects customer sites that use different AS numbers.
- C. A Layer 3 VPN is configured.
- D. A Layer 2 VPN is configured.
Answer: A,C
Explanation:
The provided configuration is for a routing instance named VPN-A on a Juniper PE (Provider Edge) router. Let's break it down:
Instance Type: VRF
The instance-type vrf; statement indicates that this is a Layer 3 VPN (L3VPN) using MPLS VPNs (RFC 4364 - BGP/MPLS IP VPNs).
This confirms that Option D (A Layer 3 VPN is configured) is correct ✅.
VRF Target and Interface Association
The vrf-target target:64512:1234; defines the route target (RT) for importing and exporting VPN routes.
The interface ge-0/0/1.0; binds this interface to the VRF.
BGP Configuration for CE (Customer Edge) Peering
The group CE section configures external BGP (EBGP) (type external;).
The neighbor 10.0.0.1 is in AS 64512 (peer-as 64512;).
The as-override; statement is used.
Evaluating the Answer Choices
✅ Option B: "This VPN connects customer sites that use the same AS number." The as-override; command allows multiple customer sites that use the same AS number (64512) to communicate over the service provider's MPLS network.
Normally, BGP prevents routes with the same AS in the AS_PATH from being accepted. The as-override feature replaces the customer's AS number with the provider's AS, ensuring proper route advertisement.
✅ This statement is correct.
❌ Option A: "This VPN connects customer sites that use different AS numbers." If the customer sites had different AS numbers, there would be no need for as-override.
The as-override feature is specifically used when all customer sites share the same AS number, ensuring that BGP routes are accepted.
❌ This statement is incorrect.
❌ Option C: "A Layer 2 VPN is configured."
A Layer 2 VPN (L2VPN) configuration would typically use instance-type l2vpn; or EVPN/VPLS-related parameters (e.g., protocols l2vpn or protocols vpls).
Since this configuration uses instance-type vrf; and BGP with a VRF target, it is clearly a Layer 3 VPN (L3VPN).
❌ This statement is incorrect.
✅ Option D: "A Layer 3 VPN is configured."
The instance-type vrf; confirms this is an MPLS Layer 3 VPN (L3VPN).
VRFs, BGP, and route targets (vrf-target) are specific to Layer 3 VPNs.
✅ This statement is correct.
Final answer:
✅ B. This VPN connects customer sites that use the same AS number.
✅ D. A Layer 3 VPN is configured.
Verification from Juniper Documentation:
Juniper BGP/MPLS Layer 3 VPNs Guide confirms that instance-type vrf is used for L3VPNs.
Juniper BGP Configuration Guide states that as-override is applied when customer sites use the same AS number.
RFC 4364 (BGP/MPLS IP VPNs) explains how route targets and VRFs are used in L3VPN deployments.
NEW QUESTION # 16
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 exceeding queue will be considered to have positive bandwidth credit
- C. The excess traffic will use bandwidth available from other queueses
- D. The excess traffic will be discarded
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 # 17
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 3 VPN is configured.
- C. This VPN connects customer sites that use the same AS number.
- D. A Layer 2 VPN is configured.
Answer: B,C
NEW QUESTION # 18
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, add the external EBGP interface's prefix to the IGP routing tables.
- C. On R4, add the internal IBGP interface prefixes to the BGP routing tables.
- D. 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.
Answer: A,B
NEW QUESTION # 19
Which two statements are correct about reflecting inet-vpn unicast prefixes in BGP route reflection? (Choose two.)
- A. Route reflectors do not change any existing BGP attributes by default when advertising routes.
- B. Clients add their originator ID when advertising routes to their route reflector
- C. A BGP peer does not require any configuration changes to become a route reflector client.
- D. Route reflectors add their cluster ID to the AS path when readvertising client routes.
Answer: A,C
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 # 20
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 as-override parameter on R2 and R3
- C. Configure the BGP group with the as-override parameter on R1 and R4
- D. Configure the BGP group with the advertise-peer-as parameter on R2 and R3.
Answer: A,B
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 # 21
Exhibit
You want to use both links between R1 and R2 Because of the bandwidth difference between the two links, you must ensure that the links are used as much as possible.
Which action will accomplish this goal?
- A. Define a policy to tag routes with the appropriate bandwidth community.
- B. Disable multipath.
- C. Enable per-prefix load balancing.
- D. Ensure that the metric-out parameter on the Gigabit Ethernet interface is higher than the 10 Gigibit Ethernet interface.
Answer: C
Explanation:
Explanation
VPLS is a Layer 2 VPN technology that allows multiple sites to connect over a shared IP/MPLS network as if they were on the same LAN. VPLS tunnels can be signaled using either Label Distribution Protocol (LDP) or Border Gateway Protocol (BGP). In this question, we have two links between R1 and R2 with different bandwidths (10 Gbps and 1 Gbps). We want to use both links as much as possible for VPLS traffic. To achieve this, we need to enable per-prefix load balancing on both routers. Per-prefix load balancing is a feature that allows a router to distribute traffic across multiple equal-cost or unequal-cost paths based on the destination prefix of each packet. This improves the utilization of multiple links and provides better load sharing than per-flow load balancing, which distributes traffic based on a hash of source and destination addresses4. Per-prefix load balancing can be enabled globally or per interface using the load-balance per-packet command.
NEW QUESTION # 22
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 protocols mpls hierarchy, add the traffic-engineering parameter
- B. Under the family inet labeled-unicast hierarchy, add the explicit null parameter.
- C. Under the family inet labeled-unicast hierarchy, add the resolve-vpn parameter.
- D. Under the protocols ospf hierarchy, add the traffic-engineering parameter.
Answer: C
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 # 23
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?
- A. vrf-import
- B. vrf-target import
- C. vrf-export
- D. vrf-target export
Answer: D
Explanation:
Explanation
The vrf-target export parameter is used to specify one or more BGP extended community attributes that are attached to VPN routes when they are exported from a VRF routing instance to remote PE routers. This parameter allows you to control which VPN routes are accepted by remote PE routers based on their import policies. You can specify more than one vrf-target export value for a VRF routing instance to support advanced route filtering or route leaking scenarios.
NEW QUESTION # 24 
Click the Exhibit button.
Referring to the exhibit, which two statements are true? (Choose two.)
- A. This route is learned from two different AS numbers.
- B. The multipath configuration is used for load balancing.
- C. The multihop configuration is used for load balancing.
- D. This route is learned from the same AS number.
Answer: B,D
Explanation:
In the exhibit, the output of the `show route protocol bgp` command is shown for the prefix `172.16.20.4/30`.
Let's analyze the provided BGP routing table to determine which statements are correct.
1. **AS Path Analysis**:
- The AS path for the route `172.16.20.4/30` is shown as `2 I`.
- This indicates that the route was learned from AS 2 and it is an internal (iBGP) route within the same AS.
2. **Multiple Paths**:
- The route has two next-hop IP addresses: `10.0.18.2` via interface `ge-1/0/4.0` and `10.0.19.2` via interface
`ge-1/0/5.0`.
- This indicates that BGP multipath is configured, which allows multiple equal-cost paths to be used for load balancing.
- BGP multipath must be explicitly configured to use multiple paths for the same prefix.
3. **Multihop vs. Multipath**:
- **Multihop Configuration**: This is typically used for establishing BGP sessions with peers that are not directly connected. It is not related to load balancing.
- **Multipath Configuration**: This is used to enable load balancing across multiple paths for the same prefix, which is the case here.
**Conclusion**:
Given the above analysis:
- **C. This route is learned from the same AS number**: Correct. The AS path `2 I` indicates the route was learned from the same AS number (AS 2).
- **D. The multipath configuration is used for load balancing**: Correct. The presence of multiple next-hops indicates that BGP multipath is configured for load balancing.
Thus, the correct answers are:
**C. This route is learned from the same AS number.**
**D. The multipath configuration is used for load balancing.**
**References**:
- Junos OS BGP Multipath Documentation: [Junos OS BGP
Multipath](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/bgp-multipath.html)
- Junos OS BGP Configuration Guide: [Junos OS BGP
Configuration](https://www.juniper.net/documentation/en_US/junos/topics/concept/bgp-routing-overview.html)
NEW QUESTION # 25
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. route-target
- B. add-path
- C. multipath
- D. multihop
Answer: B
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 # 26
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 forms an adjacency to every other router on the segment
- C. On the multi-access network, each router only forms an adjacency to the DIS.
- D. A router with a priority of 1 wins the DIS election over a router with a priority of 10.
Answer: A,B
Explanation:
Option A (Correct):
In IS-IS, the Designated Intermediate System (DIS) is elected based on the highest configured priority (as defined in Junos OS).
If priorities are equal, the router with the highest MAC address becomes the DIS.
A priority value of 10 will always override a lower priority (e.g., 1).
Reference:
Option C (Correct):
On a multi-access network (e.g., Ethernet), all IS-IS routers form adjacencies with every other router on the segment.
Unlike OSPF, IS-IS does not restrict adjacencies to only the DIS.
The DIS is responsible for creating a pseudonode LSP to represent the broadcast network, but full mesh adjacencies are maintained.
Why Other Options Are Incorrect:
Option B: Incorrect. Higher priority always wins the DIS election. A priority of 1 cannot override a priority of 10.
Option D: Incorrect. IS-IS routers form adjacencies with all neighbors, not just the DIS.
Key Takeaways:
DIS Election: Prioritizes highest numerical value (e.g., 10 > 1).
Adjacency Behavior: Full mesh adjacencies are maintained, unlike OSPF.
DIS Role: Primarily for generating pseudonode LSPs and optimizing flooding, not adjacency restriction.
For further details, refer to Juniper's official IS-IS documentation:
Juniper IS-IS Configuration Guide.
https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/concept/routing-protocol-is-is-security-designated-router-understanding.html
NEW QUESTION # 27
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, add the external EBGP interface's prefix to the IGP routing tables.
- C. On R4, add the internal IBGP interface prefixes to the BGP routing tables.
- D. 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.
Answer: A,B
NEW QUESTION # 28
Referring to the exhibit, CE-1 is providing NAT services for the hosts at Site 1 and you must provide Internet access for those hosts.
Which two statements are correct in this scenario? (Choose two.)
- A. You must configure a static route in the main routing instance for the 10.1.2.0/24 prefix that uses the VPN-A.inet.0 table as the next hop.
- B. You must configure a RIB group on PE-1 to leak a default route from the inet.0 table to the VPN-A.inet.0 table.
- C. You must configure a RIB group on PE-1 to leak the 10.1.2.0/24 prefix from the VPN-A.inet.0 table to the inet.0 table.
- D. You must configure a static route in the main routing instance for the 203.0.113.1/32 prefix that uses the VPN-A.inet.0 table as the next hop.
Answer: B,D
Explanation:
We want a static route to the public IP. The private IP is hidden behind the NATed public IP, so a static route to the private range is useless to us.
NEW QUESTION # 29
Which two statements describe PIM-SM? (Choose two)
- A. Traffic is only forwarded to routers that request to join the distribution tree.
- 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. Routers without receivers must periodically prune themselves from the SPT.
Answer: A,C
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 # 30
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