Latest [Aug 22, 2026] Juniper JN0-664 Real Exam Dumps PDF
JN0-664 Practice Test Questions Updated 99 Questions
NEW QUESTION # 45
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:
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 # 46
After a recent power outage, your manager asks you to investigate ways to automatically reduce the impact caused by suboptimal routing in your OSPF and OSPFv3 network after devices reboot.
Which three configuration statements accomplish this task? (Choose three.)
- A. set protocols ospf3 overload timeout 900
- B. set protocols ospf overload
- C. set protocols ospf overload timeout 900
- D. set protocols ospf3 overload
- E. set protocols ospf3 realm ipv4-unicast overload timeout 900
Answer: A,C,E
NEW QUESTION # 47
Which two statements are correct about IS-IS interfaces? (Choose two.)
- A. If a point-to-point interface is in both L1 and L2, separate hello messages are sent for each level.
- B. If a broadcast interface is in both L1 and L2, one combined hello message is sent for both levels.
- C. If a point-to-point interface is in both 11 and L2, one combined hello message is sent for both levels.
- D. If a broadcast interface is in both L1 and L2, separate hello messages are sent for each level.
Answer: A,D
NEW QUESTION # 48
Exhibit
You have MAC addresses moving in your EVPN environment
Referring to the exhibit, which two statements are correct about the sequence number? (Choose two)
- A. It resolves conflicting MAC address ownership claims.
- B. It helps the local PE to identify the latest advertisement.
- C. It identifies MAC addresses that should be discarded.
- D. It is advertised using a Type 2 message
Answer: A,B
Explanation:
The sequence number is a field in the MAC mobility extended community that is used to resolve conflicting MAC address ownership claims and to help the local PE to identify the latest advertisement. The sequence number is incremented by one for every MAC address mobility event, such as when a host moves from one Ethernet segment to another segment in the EVPN network. The PE device that receives multiple MAC advertisements for the same MAC address chooses the one with the highest sequence number as the most recent and valid advertisement.
NEW QUESTION # 49
Exhibit
Referring to the exhibit, which statement is correct?
- A. The route-distinguisher configuration will allow overlapping routes to be shared between CE-1 and CE-2.
- B. The vrf-target configuration will allow routes to be shared between CE-1 and CE-2.
- C. The route-diatinguisher configuration will stop routes from being shared between CE-1 and CE-2.
- D. The vrf-target configuration will stop routes from being shared between CE-1 and CE-2.
Answer: A
Explanation:
The route distinguisher (RD) is a BGP attribute that is used to create unique VPN IPv4 prefixes for each VPN in an MPLS network. The RD is a 64-bit value that consists of two parts: an administrator field and an assigned number field. The administrator field can be an AS number or an IP address, and the assigned number field can be any arbitrary value chosen by the administrator. The RD is prepended to the IPv4 prefix to create a VPN IPv4 prefix that can be advertised across the MPLS network without causing any overlap or conflict with other VPNs. In this question, we have two PE routers (PE-1 and PE-2) that are connected to two CE devices (CE-1 and CE-2) respectively. PE-1 and PE-2 are configured with VRFs named Customer-A and Customer-B respectively.
NEW QUESTION # 50
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 route target
- B. The information shows a Type 1 route distinguisher.
- C. The information shows a Type 0 route distinguisher
- D. The information shows a Type 2 route distinguisher.
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 # 51
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 rejected if the source address is 192.168.100.10.
- D. Joins for group 224.7.7.7 are always rejected, regardless of the group count.
Answer: C
NEW QUESTION # 52
After a recent power outage, your manager asks you to investigate ways to automatically reduce the impact caused by suboptimal routing in your OSPF and OSPFv3 network after devices reboot.
Which three configuration statements accomplish this task? (Choose three.)
- A. set protocols oapf3 overload timeout 900
- B. set protocols ospf3 realm ipv4-unicast overload timeout 900
- C. set protocols ospf overload
- D. set protocols ospf overload timeout 900
- E. set protocols ospf3 overload
Answer: D,E
Explanation:
Explanation
To reduce the impact of suboptimal routing in OSPF and OSPFv3 after devices reboot, you can use the overload feature to prevent a router from being used as a transit router for a specified period of time. This allows the router to stabilize its routing table before forwarding traffic for other routers. To enable the overload feature, you need to do the following:
* For OSPF, configure the overload statement under [edit protocols ospf] hierarchy level. You can also specify a timeout value in seconds to indicate how long the router should remain in overload state after it boots up. For example, set protocols ospf overload timeout 900 means that the router will be in overload state for 15 minutes after it boots up.
* For OSPFv3, configure the overload statement under [edit protocols ospf3] hierarchy level. You can also specify a realm (ipv4-unicast or ipv6-unicast) and a timeout value in seconds to indicate how long the router should remain in overload state after it boots up for each realm. For example, set protocols ospf3 realm ipv4-unicast overload timeout 900 means that the router will be in overload state for 15 minutes after it boots up for IPv4 unicast routing.
NEW QUESTION # 53
You must alter class-of-service values in packets on the outbound interface of an edge router.
In this scenario, which CoS component allows you to accomplish this task?
- A. output policer
- B. forwarding classes
- C. rewrite rules
- D. scheduler
Answer: C
Explanation:
Class of Service (CoS) in networking is used to manage traffic by classifying, scheduling, and sometimes modifying packets to ensure network performance and Quality of Service (QoS). Different CoS components are used to achieve these goals. Let's analyze each option to determine which CoS component allows you to alter class-of-service values on the outbound interface of an edge router.
1. **Output Policer**:
- Policing is used to control the rate of traffic sent to or from a network interface. It can drop or remark traffic that exceeds a certain rate.
- Policing is not typically used to alter CoS values but to enforce traffic limits.
2. **Scheduler**:
- A scheduler is responsible for managing the order in which packets are transmitted out of an interface based on their CoS markings. It can allocate bandwidth and prioritize traffic.
- The scheduler manages how packets are queued and sent but does not alter the CoS values of packets.
3. **Rewrite Rules**:
- Rewrite rules are used to modify the CoS values of packets, such as DSCP (Differentiated Services Code Point) or 802.1p bits, as they exit an interface.
- Rewrite rules can alter the class-of-service values in the packet headers to match the desired policies of the outbound interface.
- Therefore, rewrite rules are the correct component for altering CoS values on an outbound interface.
4. **Forwarding Classes**:
- Forwarding classes are used to categorize packets into different traffic classes within a router for QoS handling.
- They help in defining how packets should be treated by the scheduler but do not directly modify the CoS values.
**Conclusion**:
To alter class-of-service values in packets on the outbound interface of an edge router, the correct CoS component to use is:
**C. rewrite rules**
**References**:
- Juniper Networks Documentation on CoS: [Class of Service Overview](https://www.juniper.net
/documentation/en_US/junos/topics/concept/class-of-service-overview.html)
- Junos OS CoS Configuration Guide: [Rewrite Rules](https://www.juniper.net/documentation/en_US/junos
/topics/topic-map/class-of-service-rewrite-rules.html)
NEW QUESTION # 54
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 route target.
- B. The information shows a Type 1 route distinguisher.
- C. The information shows a Type 0 route distinguisher.
- D. The information shows a Type 2 route distinguisher.
Answer: B
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 # 55
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:
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 # 56
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. RIB groups are not needed to leak routes between the inet. 0 and VPN-A. inet. 0 tables,
- B. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1.
- C. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> GW-1.
- D. You must use RIB groups to leak routes between the inet. o and vpn-a. inet. o tables.
Answer: B,D
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 # 57
You are troubleshooting the connection between AS 64496 and AS 64497 and notice that only one of the paths is being used for traffic forwarding.
Referring to the exhibit, which three actions will ensure that R1 is configured properly for load balancing BGP routes? (Choose three.)
- A. Verify that the routing table on R1 has BGP routes for 203.0.113.128/25 with multiple next hops.
- B. Verify that an import load balancing policy exists under protocols bgp for the received BGP routes on R1.
- C. Verify that the multipath option is configured under protocols bgp on both R2 and R3.
- D. Verify that there is a load balancing export policy under routing-options for the received BGP routes on R1.
- E. Verify that the multipath option is configured under protocols bgp on R1.
Answer: A,D,E
NEW QUESTION # 58
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. R2 will advertise 10.0.0.0/16 to R3 with 192.168.1 1 as the next hop
- D. R1 will prepend AS 65531 when advertising 10 0.0 0/16 to R2.
- 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 # 59
Exhibit
R4 is directly connected to both RPs (R2 and R3) R4 is currently sending all ,o,ns upstream to R3 but you want all joins to go to R2 instead Referring to the exhibit, which configuration change will solve this issue?
- A. Change the default route in inet.2 on R4 from R3 as the next hop to R2
- B. Change the local address on R2 to be higher than R3.
- C. Change the bootstrap priority on R2 to be higher than R3
- D. Change the group-range to be more specific on R2 than R3.
Answer: D
Explanation:
The issue arises because R3's group-range (224.1.1.0/28) is more specific than R2's group-range (224.1.1.0/24). In PIM bootstrap (BSR), the RP with the longest prefix (most specific group-range) is preferred, regardless of priority. Even though R3 has a higher bootstrap priority (210 vs. R2's 200), its more specific /28 group-range takes precedence for groups within 224.1.1.0/28.
Why Option D is Correct:
To force R4 to use R2 for all joins, R2's group-range must be more specific than R3's. For example:
If R2's group-range is changed to 224.1.1.0/28 (same as R3) but with a higher priority, R2 would win (priority is compared only when group-ranges are equal).
If R2's group-range is changed to 224.1.1.0/29 (more specific than /28), it will override R3's /28 for groups in the /29 range.
The key is prefix specificity, which overrides priority in BSR elections.
Why Other Options Are Incorrect:
A . Change bootstrap priority on R2 to be higher than R3:
Priority is evaluated only when group-ranges are identical. Since R3's group-range (/28) is more specific than R2's (/24), R3 will still win for groups in 224.1.1.0/28, even if R2's priority is higher.
B . Change the default route in inet.2 on R4:
RPF routes (inet.2) determine how traffic reaches the RP, but they do not influence RP election logic (BSR priority/group-range).
C . Change R2's local address to be higher than R3's:
The RP address is a tiebreaker only if priorities and group-ranges are equal. Since R3's group-range is more specific, this change has no impact.
Key Takeaways:
BSR RP Election Order:
Longest group prefix (most specific).
Highest priority (if prefixes are equal).
Highest RP address (if prefixes and priorities are equal).
To override R3, R2 must advertise a more specific group-range (e.g., /28 or smaller) to ensure it is selected for the desired multicast groups.
Reference:
Juniper PIM Sparse Mode and BSR Configuration.
NEW QUESTION # 60
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