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Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) certification exam is designed for individuals who have a strong understanding of the Junos OS routing and switching technology in a service provider environment. Service Provider, Professional (JNCIP-SP) certification exam is a part of the Juniper Networks Certified Professional Service Provider (JNCIP-SP) certification track. Passing JN0-664 exam validates an individual's ability to configure, implement, and troubleshoot a variety of service provider routing and switching technologies.
Juniper JN0-664 exam is designed for professionals who want to prove their skills and knowledge in the Service Provider field. JN0-664 exam is part of the Juniper Networks Certified Internet Professional (JNCIP-SP) certification program. Candidates who pass JN0-664 exam are considered to have a deep understanding of the Juniper Networks Service Provider Routing and Switching technologies.
The JN0-664 exam covers a wide range of topics including but not limited to, OSPF, ISIS, BGP, MPLS, LDP, L2VPN, L3VPN, RSVP, BFD, VRRP, and many more. It is a comprehensive exam that tests your understanding of the underlying technologies, as well as your ability to apply that knowledge in real-world scenarios. JN0-664 exam consists of multiple-choice questions, and you will have four hours to complete it.
NEW QUESTION # 31
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-unicast 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 resolve-vpn parameter.
- C. Under the family inet labeled-unicast hierarchy, add the explicit null parameter.
- D. Under the protocols ospf hierarchy, add the traffic-engineering parameter.
Answer: B
NEW QUESTION # 32
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. 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.
- B. 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.
- C. You must create a unique Layer 2 VPN routing instance for each site on the PE-2 device.
- D. You must use separate physical interfaces to connect PE-2 to each site.
Answer: B
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 # 33
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 172.16.1.1 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, 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 internal IBGP interface prefixes to the BGP routing tables.
Answer: B,C
NEW QUESTION # 34
Exhibit
The environment is using BGP All devices are in the same AS with reachability redundancy Referring to the exhibit, which statement is correct?
- A. Client1 is peered to Client2 and Client3.
- B. RR2 is in an OpenConfirm State until RR1 becomes unreachable.
- C. Peering is dynamically discovered between all devices.
- D. RR1 is peered to Client2 and RR2
Answer: D
Explanation:
Explanation
BGP route reflectors are BGP routers that are allowed to ignore the IBGP loop avoidance rule and advertise IBGP learned routes to other IBGP peers under specific conditions. BGP route reflectors can reduce the number of IBGP sessions and updates in a network by eliminating the need for a full mesh of IBGP peers.
BGP route reflectors can have three types of peerings:
* EBGP neighbor: A BGP router that belongs to a different autonomous system (AS) than the route reflector.
* IBGP client neighbor: An IBGP router that receives reflected routes from the route reflector. A client does not need to peer with other clients or non-clients.
* IBGP non-client neighbor: An IBGP router that does not receive reflected routes from the route reflector. A non-client needs to peer with other non-clients and the route reflector.
In the exhibit, we can see that RR1 and RR2 are route reflectors in the same AS with reachability redundancy.
They have two types of peerings: EBGP neighbors (R1 and R4) and IBGP client neighbors (Client1, Client2, and Client3). RR1 and RR2 are also peered with each other as IBGP non-client neighbors.
NEW QUESTION # 35
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 -> GW-1.
- B. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1.
- C. You must use RIB groups to leak routes between the inet.0 and VPN-A.inet.0 tables.
- D. RIB groups are not needed to leak routes between the inet.0 and VPN-A.inet.0 tables.
Answer: B,C
NEW QUESTION # 36
A router running IS-IS is configured with an ISO address of 49.0001.00a0.c96b.c490.00.
Which part of this address is the system ID?
- A. 00a0.c96b.c490 is the system identifier.
- B. c490 is the system identifier.
- C. c96b.c490 is the system identifier.
- D. 0001.00a0.c96b.c490 is the system identifier.
Answer: A
Explanation:
In IS-IS (Intermediate System to Intermediate System) routing, each router is identified by a unique ISO (International Organization for Standardization) address, also known as a Network Entity Title (NET). The NET consists of three parts:
1. **Area Identifier**: Indicates the area to which the router belongs.
2. **System Identifier**: Uniquely identifies the router within the area.
3. **NSAP Selector (NSEL)**: Typically set to 00 for a router, indicating the Network Service Access Point.
The format of the ISO address is `49.XXXX.YYYY.YYYY.ZZZZ.ZZZZ.00`, where:
- `49` is the AFI (Authority and Format Identifier) indicating a private address.
- `XXXX` is the Area Identifier.
- `YYYY.YYYY.YYYY` is the System Identifier.
- `ZZZZ.ZZZZ` is the NSAP Selector.
Given the address `49.0001.00a0.c96b.c490.00`:
- **Area Identifier**: `49.0001`
- **System Identifier**: `00a0.c96b.c490`
- **NSAP Selector**: `00`
**Explanation**:
- **A. 00a0.c96b.c490 is the system identifier**:
- Correct. The System Identifier in an ISO address is a 48-bit (6-byte) field used to uniquely identify the router. In this address, `00a0.c96b.c490` is the correct 6-byte System Identifier.
- **B. 0001.00a0.c96b.c490 is the system identifier**:
- Incorrect. This includes the Area Identifier as part of the System Identifier, which is not correct.
- **C. c96b.c490 is the system identifier**:
- Incorrect. This is only part of the System Identifier. The full System Identifier must be 6 bytes long.
- **D. c490 is the system identifier**:
- Incorrect. This is an incomplete and incorrect part of the System Identifier.
**Conclusion**:
The correct part of the address that represents the System Identifier is:
**A. 00a0.c96b.c490 is the system identifier.**
**References**:
- Juniper Networks Documentation on IS-IS: [IS-IS
Configuration](https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/isis-configuring.h
- ISO/IEC 10589, the IS-IS routing protocol standard.
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 2 route distinguisher.
- B. The information shows a Type 0 route distinguisher
- C. The information shows a route target
- D. The information shows a Type 1 route distinguisher.
Answer: B
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 # 38
Referring to the exhibit, which two statements are true? (Choose two.)
- A. This route is learned from two different AS numbers.
- B. The multihop configuration is used for load balancing.
- C. This route is learned from the same AS number.
- D. The multipath configuration is used for load balancing.
Answer: C,D
NEW QUESTION # 39
Which two statements are correct about the class-of-service configuration shown in the exhibit?
(Choose two.)
- A. To use this drop profile, you apply it directly to an interface.
- B. The drop probability jumps immediately from 20% to 60% when the queue level reaches 75% full.
- C. The drop probability gradually increases from 20% to 60% as the queue level increases from 50% full to 75% full.
- D. To use this drop profile, you reference it in a scheduler.
Answer: C,D
NEW QUESTION # 40
Which two statements are correct about reflecting inet-vpn unicast prefixes in BGP route reflection? (Choose two.)
- A. Route reflectors add their cluster ID to the AS path when readvertising client routes.
- B. Clients add their originator ID when advertising routes to their route reflector
- 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:
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
Exhibit
Which two statements about the output shown in the exhibit are correct? (Choose two.)
- A. The PE is attached to a single local site.
- B. The connection has not flapped since it was initiated.
- C. There has been a VLAN ID mismatch.
- D. The PE router has the capability to pop flow labels
Answer: A,D
Explanation:
Explanation
According to 1 and 2, 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 the output shown in the exhibit, we can see some information about the L2VPN RIB and the pseudowire state. Based on this information, we can infer the following statements:
* The PE is attached to a single local site. This is correct because the output shows only one local site ID (1) under the L2VPN RIB section. A local site ID is a unique identifier for a site within a VPLS domain.
If there were multiple local sites attached to the PE, we would see multiple local site IDs with different prefixes.
* The connection has not flapped since it was initiated. This is correct because the output shows that the uptime of the pseudowire is equal to its total uptime (1w6d). This means that the pseudowire has been up for one week and six days without any interruption or flap.
* There has been a VLAN ID mismatch. This is not correct because the output shows that the remote and local VLAN IDs are both 0 under the pseudowire state section. A VLAN ID mismatch occurs when the remote and local VLAN IDs are different, which can cause traffic loss or misdelivery. If there was a VLAN ID mismatch, we would see different values for the remote and local VLAN IDs.
* The PE router has the capability to pop flow labels. This is correct because the output shows that the flow label pop bit is set under the pseudowire state section. The flow label pop bit indicates that the PE router can pop (remove) the MPLS flow label from the packet before forwarding it to the CE device.
The flow label is an optional MPLS label that can be used for load balancing or traffic engineering purposes.
NEW QUESTION # 42
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 group 224.7.7.7 are always rejected, regardless of the group count.
- C. Joins for any group are accepted if the group count value is less than 25.
- D. Joins for group 224.7.7.7 are rejected if the source address is 192.168.100.10
Answer: A
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 # 43
In which two ways does OSPF prevent routing loops in multi-area networks? (Choose two.)
- A. The LFA algorithm prunes all looped paths within an area.
- B. All areas are required to connect as a full mesh.
- C. All areas are required to connect to area 0.
- D. The SPF algorithm prunes looped paths within an area.
Answer: C,D
NEW QUESTION # 44
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. Configure VPN prefix mapping for the PE-1_to_PE-2 LSP
- C. Configure the explicit-null statement on PE-2
- D. Set a static CoS value for the PE-1_to_PE-2 LSP
Answer: A
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 # 45
Which two statements describe PIM-SM? (Choose two.)
- A. Routers with receivers send join messages to their upstream neighbors.
- B. Routers without receivers must periodically prune themselves from the SPT.
- C. Traffic is initially flooded to all routers and an S,G is maintained for each group.
- D. Traffic is only forwarded to routers that request to join the distribution tree.
Answer: A,D
NEW QUESTION # 46
By default, which statement is correct about OSPF summary LSAs?
- A. The area-range command must be installed on all routers.
- B. Type 3 LSAs are advertised for routes in Type 1 LSAs.
- C. All Type 2 and Type 7 LSAs will be summanzed into a single Type 5 LSA
- D. The metric associated with a summary route will be equal to the lowest metric associated with an individual contributing route
Answer: B
Explanation:
OSPF uses different types of LSAs to describe different aspects of the network topology. Type 1 LSAs are also known as router LSAs, and they describe the links and interfaces of a router within an area. Type 3 LSAs are also known as summary LSAs, and they describe routes to networks outside an area but within the same autonomous system (AS). By default, OSPF will summarize routes from Type 1 LSAs into Type 3 LSAs when advertising them across area boundaries .
NEW QUESTION # 47
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
- B. set protocols ospf overload
- C. set protocols ospf overload timeout 900
- D. set protocols ospf3 overload timeout 900
- E. set protocols ospf3 realm ipv4-unicast overload timeout 900
Answer: C,D,E
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 # 48
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 routing-options aggregate route 203.0.113.128/25 command.
- B. Remove the from protocol bgp command from the export policy.
- C. Add the set protocols bgp family inet unicast add-path command to allow additional routes to the RIB tables.
- D. Replace exact in the export policy with orlonger.
Answer: A,D
NEW QUESTION # 49
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: 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 # 50
Which origin code is preferred by BGP?
- A. Null
- B. External
- C. Internal
- D. Incomplete
Answer: D
Explanation:
Explanation
BGP uses several attributes to select the best path for a destination prefix. One of these attributes is origin, which indicates how BGP learned about a route. The origin attribute can have one of three values: IGP, EGP, or Incomplete. IGP means that the route was originated by a network or aggregate statement within BGP or by redistribution from an IGP into BGP. EGP means that the route was learned from an external BGP peer (this value is obsolete since BGP version 4). Incomplete means that the route was learned by some other means, such as redistribution from a static route into BGP. BGP prefers routes with lower origin values, so Incomplete is preferred over EGP, which is preferred over IGP.
NEW QUESTION # 51
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. delete protocols isis export summary-v6
- B. set policy-options policy-statement leak-v6 term DC-routes from route-filter 2001:db9:a:faOO::/61 exact
- C. delete policy-options policy-statement leak-v6 term DC-routes from route-filter 2001: db9 :a: fa00 : :/6l longer
- D. set policy-options policy-statement leak-v6 term DC-routes then reject
- E. set protocols isis import summary-v6
Answer: A,B,C
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 # 52
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 as-override parameter on R2 and R3
- B. Configure the BGP group with the advertise-peer-as parameter on R1 and R4.
- C. Configure the BGP group with the advertise-peer-as parameter on R2 and R3.
- D. Configure the BGP group with the as-override parameter on R1 and R4
Answer: A,C
NEW QUESTION # 53
An interface is configured with a behavior aggregate classifier and a multifield classifier How will the packet be processed when received on this interface?
- A. The packet will be processed by the BA classifier first, then the MF classifier.
- B. The packet will be discarded.
- C. The packet will be forwarded with no classification changes.
- D. The packet will be processed by the MF classifier first, then the BA classifier.
Answer: C
Explanation:
Explanation
behavior aggregate (BA) classifiers and multifield (MF) classifiers are two types of classifiers that are used to assign packets to a forwarding class and a loss priority based on different criteria. The forwarding class determines the output queue for a packet. The loss priority is used by a scheduler to control packet discard during periods of congestion.
A BA classifier maps packets to a forwarding class and a loss priority based on a fixed-length field in the packet header, such as DSCP, IP precedence, MPLS EXP, or IEEE 802.1p CoS bits. A BA classifier is computationally efficient and suitable for core devices that handle high traffic volumes. A BA classifier is useful if the traffic comes from a trusted source and the CoS value in the packet header is trusted.
An MF classifier maps packets to a forwarding class and a loss priority based on multiple fields in the packet header, such as source address, destination address, protocol type, port number, or VLAN ID. An MF classifier is more flexible and granular than a BA classifier and can match packets based on complex filter rules. An MF classifier is suitable for edge devices that need to classify traffic from untrusted sources or rewrite packet headers.
You can configure both a BA classifier and an MF classifier on an interface. If you do this, the BA classification is performed first and then the MF classification. If the two classification results conflict, the MF classification result overrides the BA classification result.
Based on this information, we can infer the following statements:
* The packet will be discarded. This is not correct because the packet will not be discarded by the classifiers unless it matches a filter rule that specifies discard as an action. The classifiers only assign packets to a forwarding class and a loss priority based on their match criteria.
* The packet will be processed by the BA classifier first, then the MF classifier. This is correct because if both a BA classifier and an MF classifier are configured on an interface, the BA classification is performed first and then the MF classification. If they conflict, the MF classification result overrides the BA classification result.
* The packet will be forwarded with no classification changes. This is not correct because the packet will be classified by both the BA classifier and the MF classifier if they are configured on an interface. The final classification result will determine which output queue and which discard policy will be applied to the packet.
* The packet will be processed by the MF classifier first, then the BA classifier. This is not correct because if both a BA classifier and an MF classifier are configured on an interface, the BA classification is performed first and then the MF classification. If they conflict, the MF classification result overrides the BA classification result.
NEW QUESTION # 54
The environment is using BGP. All devices are in the same AS with reachability redundancy.
Referring to the exhibit, which statement is correct?
- A. Client1 is peered to Client2 and Client3.
- B. RR1 is peered to Client2 and RR2.
- C. RR2 is in an OpenConfirm State until RR1 becomes unreachable.
- D. Peering is dynamically discovered between all devices.
Answer: B
NEW QUESTION # 55
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