Online Questions - Valid Practice To your JN0-664 Exam (Updated 99 Questions)
Practice To JN0-664 - Remarkable Practice On your Service Provider, Professional (JNCIP-SP) Exam
To be eligible to take the JN0-664 exam, candidates must have a valid JNCIS-SP certification or possess equivalent knowledge and experience in service provider networking. JN0-664 exam is computer-based and consists of 65 multiple-choice questions, which must be completed in 120 minutes.
Juniper JN0-664 exam is an essential certification for IT professionals who want to demonstrate their expertise in service provider routing and switching. JN0-664 exam is challenging and requires a solid understanding of Juniper Networks' service provider routing and switching platforms. However, with the right preparation and resources, candidates can successfully pass the JN0-664 exam and become certified professionals in service provider routing and switching.
NEW QUESTION # 54
Referring to the exhibit, which two statements are correct about the dual route reflectors within a cluster? (Choose two.)
- A. RR1 and RR2 must have the same duster ID to exchange routes learned from the client.
- B. RR1 advertises routes from the client to RR2. using itself as the next hop.
- C. RR1 and RR2 advertise routes learned from the clients to EBGP peers, using itself as the next hop.
- D. RR1 and RR2 append the duster ID when advertising routes from dient to dient.
Answer: C,D
Explanation:
If you have redundant RRs with the same cluster ID, they will discard each other's routes. If they have different cluster IDs, they will accept each other's routes.
Since the route is advertised using ebgp, nexthop is the address of each of RR1 and RR2.
NEW QUESTION # 55
Which two statements are correct regarding bootstrap messages that are forwarded within a PIM sparse mode domain? (Choose two.)
- A. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain.
- B. Bootstrap messages distribute RP information dynamically during an RP election.
- C. Bootstrap messages are used to notify which router is the PIM RP
- D. Bootstrap messages are forwarded only to routers that explicitly requested the messages within the PIM sparse-mode domain
Answer: A,B
Explanation:
Explanation
Bootstrap messages are PIM messages that are used to distribute rendezvous point (RP) information dynamically during an RP election. Bootstrap messages are sent by bootstrap routers (BSRs), which are routers that are elected to perform the RP discovery function for a PIM sparse-mode domain. Bootstrap messages contain information about candidate RPs and their multicast groups, as well as BSR priority and hash mask length. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain using hop-by-hop flooding.
NEW QUESTION # 56
You are configuring schedulers to define the class-of-service properties of output queues. You want to control packet drops during periods of congestion.
In this scenario, which CoS configuration parameter would be used to accomplish this task?
- A. drop profile
- B. buffer size
- C. priority
- D. shaping rate
Answer: A
Explanation:
When configuring Class of Service (CoS) properties for output queues, we need to manage packet drops during periods of congestion. Juniper's CoS framework provides several tools to manage congestion, including drop profiles, buffer sizes, and scheduling mechanisms. Let's break down each option and identify the correct one.
Evaluating the Answer Choices
✅ D. drop profile (Correct Answer)
Why?
A drop profile defines when packets should be dropped based on the queue fill level.
Random Early Detection (RED) or Tail Drop can be used to manage congestion by discarding lower-priority packets first.
Drop profiles are configured under the scheduler to determine how aggressive packet dropping should be during congestion.
Example Juniper Configuration:
schedulers {
best-effort {
drop-profile low-drop;
}
}
drop-profiles {
low-drop {
fill-level 80 drop-probability 50;
}
}
fill-level 80 → When the queue reaches 80% full, packet drops begin.
drop-probability 50 → There is a 50% chance of dropping packets once the threshold is reached.
Official Juniper Documentation Reference:
Junos Class of Service Configuration Guide
"A drop profile determines how packets are discarded based on the queue fill level, allowing control over congestion behavior." Why the Other Options Are Incorrect?
❌ A. buffer size (Incorrect)
Why?
The buffer size determines how many packets the queue can store before congestion occurs.
A larger buffer can delay drops, but it does not actively control dropping behavior.
It affects latency rather than controlling packet drops.
❌ B. priority (Incorrect)
Why?
Priority controls which queue gets serviced first, not how drops are handled.
Higher priority queues are serviced before lower-priority queues, but this does not prevent congestion-related drops.
❌ C. shaping rate (Incorrect)
Why?
Shaping limits the maximum transmission rate of the queue.
While shaping helps reduce congestion, it does not control which packets get dropped during congestion.
Shaping is useful for traffic smoothing, but it does not actively drop packets based on queue fill levels.
Final answer: ✅ D. drop profile
Controls packet drops based on queue congestion.
Defines RED (Random Early Detection) or Tail Drop mechanisms.
Directly influences drop probability as the queue fills up.
Official Juniper Reference:
"Drop profiles are used to manage congestion by determining when and how aggressively packets are dropped based on queue fill level."
NEW QUESTION # 57
Exhibit.
Referring to the exhibit, which path would traffic passing through R1 take to get to R4?
- A. R1 -> R4
- B. R1 -> R2 -> R3 -> R4
- C. R1 -> R3 -> R4
- D. R1 -> R2 -> R4
Answer: D
Explanation:
The OSPF cost is carried in the LSAs that are exchanged within an OSPF area. When a router calculates the cost to a destination it uses the cost of the exit interface of each router in the path to the destination.
NEW QUESTION # 58
Which origin code is preferred by BGP?
- A. Incomplete
- B. External
- C. Null
- D. Internal
Answer: D
Explanation:
Prefer the route with the lower origin code. Routes learned from an IGP have a lower origin code than those learned from an exterior gateway protocol (EGP), and both have lower origin codes than incomplete routes (routes whose origin is unknown). https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/bgp/topics/concept/routing-protocols-address-representation.html
NEW QUESTION # 59
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, add the internal IBGP interface prefixes to the BGP routing tables.
- 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. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy.
- D. On R4, add the external EBGP interface's prefix to the IGP routing tables.
Answer: C,D
NEW QUESTION # 60
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: D
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 # 61
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. Configure an import routing policy on the CE routers that rejects OSPF routes learned on the backup intra-area link.
- B. Configure the OSPF metric on the backup intra-area link that is higher than the L3VPN link.
- C. Create an OSPF sham link between the PE routers.
- D. Enable OSPF traffic-engineering.
Answer: C
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.
https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/topic-map/configuring-ospfv2-sham-links.html
NEW QUESTION # 62
You are configuring a BGP signaled Layer 2 VPN across your MPLS enabled core network. Your PE-2 device connects to two sites within the s VPN In this scenario, which statement is correct?
- A. You must create a unique Layer 2 VPN routing instance for each site on the PE-2 device.
- B. You must use separate physical interfaces to connect PE-2 to each site.
- C. By default on PE-2, the remote site IDs are automatically assigned based on the order that you add the interfaces to the site configuration.
- D. By default on PE-2, the site's local ID is automatically assigned a value of 0 and must be configured to match the total number of attached sites.
Answer: C
Explanation:
Explanation
BGP Layer 2 VPNs use BGP to distribute endpoint provisioning information and set up pseudowires between PE devices. BGP uses the Layer 2 VPN (L2VPN) Routing Information Base (RIB) to store endpoint provisioning information, which is updated each time any Layer 2 virtual forwarding instance (VFI) is configured. The prefix and path information is stored in the L2VPN database, which allows BGP to make decisions about the best path.
In BGP Layer 2 VPNs, each site has a unique site ID that identifies it within a VFI. The site ID can be manually configured or automatically assigned by the PE device. By default, the site ID is automatically assigned based on the order that you add the interfaces to the site configuration. The first interface added to a site configuration has a site ID of 1, the second interface added has a site ID of 2, and so on.
Option D is correct because by default on PE-2, the remote site IDs are automatically assigned based on the order that you add the interfaces to the site configuration. Option A is not correct because by default on PE-2, the site's local ID is automatically assigned a value of 0 and does not need to be configured to match the total number of attached sites. Option B is not correct because you do not need to create a unique Layer 2 VPN routing instance for each site on the PE-2 device. You can create one routing instance for all sites within a VFI. Option C is not correct because you do not need to use separate physical interfaces to connect PE-2 to each site. You can use subinterfaces or service instances on a single physical interface.
NEW QUESTION # 63
You are configuring a BGP signaled Layer 2 VPN across your MPLS enabled core network. In this scenario, which statement is correct?
- A. You must use the same route-distinguiaher value on both PE devices.
- B. This type of VPN only supports Ethernet interfaces when connecting to CE devices.
- C. This type of VPN requires the support of the inet-vpn NLRI on all core BGP devices
- D. You must assign a unique site number to each attached site's configuration.
Answer: D
NEW QUESTION # 64
Exhibit
Which two statements about the configuration shown in the exhibit are correct? (Choose two.)
- A. A Layer 3 VPN is configured.
- B. This VPN connects customer sites that use different AS numbers.
- C. A Layer 2 VPN is configured.
- D. This VPN connects customer sites that use the same AS number
Answer: A,B
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 # 65
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. Change the level 1 disable parameter under the R2 protocols isis interface ge-1/2/3 .0 hierarchy to the level 2 disable parameter
- D. Add IP addresses to the interface ge-l/2/3 unit 0 family iso hierarchy on both R1 and R2.
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 # 66
Exhibit
A network designer would like to create a summary route as shown in the exhibit, but the configuration is not working.
Which three configuration changes will create a summary route? (Choose three.)
- A. set protocols isis import summary-v6
- B. set policy-options policy-statement leak-v6 term DC-routes from route-filter 2001:db9:a:faOO::/61 exact
- C. delete protocols isis export summary-v6
- D. set policy-options policy-statement leak-v6 term DC-routes then reject
- E. delete policy-options policy-statement leak-v6 term DC-routes from route-filter 2001: db9 :a: fa00 : :/6l longer
Answer: B,C,E
Explanation:
To create a summary route for IS-IS, you need to configure a policy statement that matches the prefixes to be summarized and sets the next-hop to discard. You also need to configure a summary-address statement under the IS-IS protocol hierarchy that references the policy statement. In this case, the policy statement leak-v6 is trying to match the prefix 2001:db9:a:fa00::/61 exactly, but this prefix is not advertised by any router in the network. Therefore, no summary route is created. To fix this, you need to delete the longer keyword from the route-filter term and change the prefix length to /61 exact. This will match any prefix that falls within the /61 range. You also need to delete the export statement under protocols isis, because this will export all routes that match the policy statement to other IS-IS routers, which is not desired for a summary route.
NEW QUESTION # 67
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 included in the control plane LDP advertisement
- B. When the encapsulation is vlan-ccc or extended-vlan-ccc, the configured VLAN tag is not included in the control plane LDP advertisement
- C. When the encapsulation is ethemet-ccc, tagged and untagged frames are both accepted in the data plane.
- D. When the encapsulation is ethernet-ccc, only frames without a VLAN tag are accepted in the data plane
Answer: A,C
Explanation:
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 # 68
After adding Customer C to your Layer 3 VPN. you must ensure that PE2 is receiving VPN routes for all customers attached to PE1, as shown in the exhibit.
Which operational command displays this information?
- A. show route table customer-c.inet.0
- B. show route table bgp.l3vpn.0
- C. show route table inet.0
- D. show route summary
Answer: B
NEW QUESTION # 69
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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.
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