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The JN0-664 exam covers a wide range of topics related to service provider routing and switching technologies, including Border Gateway Protocol (BGP), Intermediate System to Intermediate System (IS-IS), Routing Information Protocol (RIP), and Open Shortest Path First (OSPF). Additionally, the exam also covers advanced topics such as multicast, MPLS, and layer 2 VPNs.
Successful completion of the Juniper JN0-664 Certification Exam demonstrates an individual's ability to design, implement, and troubleshoot complex service provider networks. It also demonstrates an individual's ability to configure and manage Juniper Networks' routing and switching platforms to meet the needs of service provider customers.
NEW QUESTION # 28
Exhibit
Referring to the exhibit, which two statements are true? (Choose two.)
- A. The device advertising this route into EVPN is 192.168.101.5.
- B. The devices advertising this route into EVPN are 10 0 2 12 and 10.0.2.22.
- C. This is an EVPN Type-2 route.
- D. This route is learned through EBGP
Answer: A,C
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 # 29
Exhibit
A network is using IS-IS for routing.
In this scenario, why are there two TLVs shown in the exhibit?
- A. Both IPv4 and IPv6 are being used in the topology
- B. Wide metrics have specifically been requested
- C. The interface specified a metric of 100 for L2.
- D. There are both narrow and wide metric devices in the topology
Answer: D
Explanation:
TLVs are tuples of (Type, Length, Value) that can be advertised in IS-IS packets. TLVs can carry different kinds of information in the Link State Packets (LSPs). IS-IS supports both narrow and wide metrics for link costs. Narrow metrics use a single octet to encode the link cost, while wide metrics use three octets. Narrow metrics have a maximum value of 63, while wide metrics have a maximum value of 16777215. If there are both narrow and wide metric devices in the topology, IS-IS will advertise two TLVs for each link: one with the narrow metric and one with the wide metric. This allows backward compatibility with older devices that only support narrow metrics12.
NEW QUESTION # 30
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 forwarded with no classification changes.
- C. The packet will be discarded.
- D. The packet will be processed by the MF classifier first, then the BA classifier.
Answer: A
NEW QUESTION # 31
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. Add the external interface prefix to the IGP routing tables
- B. Add the internal interface prefix to the BGP routing tables.
- C. 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
- D. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy
Answer: A,D
Explanation:
the default behavior for iBGP is to propagate EBGP-learned prefixes without changing the next-hop. This can cause issues if the next-hop is not reachable via the IGP. One solution is to use the next-hop self command on R4, which will change the next-hop attribute to its own loopback address. This way, R5 can reach the next-hop via the IGP and install the route in its routing table.
Another solution is to add the external interface prefix (120.0.4.16/30) to the IGP routing tables of R4 and R5.
This will also make the next-hop reachable via the IGP and allow R5 to use the route. According to 2, this is a possible workaround for a pure IP network, but it may not work well for an MPLS network.
The reason why the route is being hidden is that R5 cannot reach the BGP next hop 10.0.0.1, which is the address of R1. R5 does not have a route to 10.0.0.0/24 in its routing table, and neither does R4. Therefore, R5 cannot resolve the BGP next hop and marks the route as hidden.
There are two solutions that will solve this problem:
Option A: On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy. This way, R5 will receive the route with a next hop of 172.16.1.2, which is reachable via the IGP. This solution is also known as next-hop-self1.
Option B: Add the external interface prefix to the IGP routing tables. This way, R4 and R5 will learn a route to 10.0.0.0/24 via the IGP and be able to resolve the BGP next hop. This solution is also known as recursive lookup2.
Option C is not correct because adding the internal interface prefix to the BGP routing tables will not help R5 reach the BGP next hop 10.0.0.1.
Option D is not correct because changing the BGP next hop to 172.16.1.1 on R4 will not help R5 either, since R5 does not have a route to 172.16.1.1 in its routing table.
References: 1: Configuring Next-Hop-Self for IBGP Peers 2: Understanding Recursive Lookup
NEW QUESTION # 32
Your network is receiving the 203.0.113.0/24 network using EBGP from AS 64500 and AS 64501. Both of these advertisements have identical local-preference values, AS-path lengths, and BGP origin codes. You want to influence the way your AS sends traffic to the 203.0.113.0/24 network.
In this scenario, which attribute would you consider next when selecting the best path?
- A. MED value
- B. router ID
- C. peer IP address
- D. IGP metric
Answer: B
Explanation:
as by default, the MED attribute is only compared for routes received from the same neighbouring AS. The next feasible tiebreaker in the BGP route selection algorithm would be Router ID.
NEW QUESTION # 33
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. rewrite rules
- C. scheduler
- D. forwarding classes
Answer: B
NEW QUESTION # 34
Exhibit
R2 is receiving the same route from R1 and R3. You must ensure that you can load balance traffic for that route.
Referring to the exhibit, which configuration change will allow load balancing?
- A. Apply the prepend policy as an import policy under group R1.
- B. Apply the prepend policy as an import policy under group R3.
- C. Configure the multipath parameter under the global BGP configuration.
- D. Configure the multipath multiple-as parameter under the global BGP configuration.
Answer: D
NEW QUESTION # 35
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. 0001.00a0.c96b.c490 is the system identifier.
- C. c96b.c490 is the system identifier.
- D. c490 is the system identifier.
Answer: A
NEW QUESTION # 36
You want to ensure that a single-area OSPF network will be loop free.
In this scenario, what are two requirements that satisfy this requirement? (Choose two.)
- A. The Shortest Path First algorithm must prune looped paths.
- B. All nodes within an area must have the same information in their LSDBs.
- C. Nodes within an area must connect in a full mesh.
- D. The DR/BDR ensures that each node within an area has the same information in their LSDBs.
Answer: A,B
NEW QUESTION # 37
You want to ensure that L1 IS-IS routers have only the most specific routes available from L2 IS-IS routers.
Which action accomplishes this task?
- A. Configure the ignore-attached-bit parameter on all L1 routers
- B. Configure all routers to be L1.
- C. Configure the ignore-attached-bit parameter on all L2 routers.
- D. Configure all routers to allow wide metrics.
Answer: A
Explanation:
Explanation
The attached bit is a flag in an IS-IS LSP that indicates whether a router is connected to another area or level (L2) of the network. By default, L2 routers set this bit when they advertise their LSPs to L1 routers, and L1 routers use this bit to select a default route to reach other areas or levels through L2 routers. However, this may result in suboptimal routing if there are multiple L2 routers with different paths to other areas or levels.
To ensure that L1 routers have only the most specific routes available from L2 routers, you can configure the ignore-attached-bit parameter on all L1 routers. This makes L1 routers ignore the attached bit and install all interarea routes learned from L2 routers in their routing tables.
NEW QUESTION # 38
You want to ensure that L1 IS-IS routers have only the most specific routes available from L2 IS-IS routers.
Which action accomplishes this task?
- A. Configure the ignore-attached-bit parameter on all L1 routers
- B. Configure all routers to be L1.
- C. Configure the ignore-attached-bit parameter on all L2 routers.
- D. Configure all routers to allow wide metrics.
Answer: A
Explanation:
The attached bit is a flag in an IS-IS LSP that indicates whether a router is connected to another area or level (L2) of the network. By default, L2 routers set this bit when they advertise their LSPs to L1 routers, and L1 routers use this bit to select a default route to reach other areas or levels through L2 routers. However, this may result in suboptimal routing if there are multiple L2 routers with different paths to other areas or levels.
To ensure that L1 routers have only the most specific routes available from L2 routers, you can configure the ignore-attached-bit parameter on all L1 routers. This makes L1 routers ignore the attached bit and install all interarea routes learned from L2 routers in their routing tables.
NEW QUESTION # 39
You have an L2VPN connecting two CEs across a provider network that runs OSPF. You have OSPF configured on both CEs.
Which two statements are correct in this scenario? (Choose two.)
- A. The CE and PE OSPF areas can be different.
- B. OSPF neighborship is formed between the CEs and PEs.
- C. OSPF neighborship is formed between the two CEs.
- D. The CE and PE OSPF areas must match.
Answer: A,C
NEW QUESTION # 40
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 Type 1 route distinguisher.
- D. The information shows a route target
Answer: C
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 # 41
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. 0001.00a0.c96b.c490 is the system identifier.
- C. c96b.c490 is the system identifier.
- D. 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 # 42
When using OSPFv3 for an IPv4 environment, which statement is correct?
- A. OSPFv3 supports IPv4 only on interfaces with family inet6 defined
- B. OSPFv3 is not backward compatible with IPv4
- C. OSPFv3 only supports IPv4.
- D. OSPFv3 supports both IPv6 and IPv4, but not in the same routing instance.
Answer: B
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 # 43
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 1 wins the DIS election over a router with a priority of 10.
- 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 10 wins the DIS election over a router with a priority of 1.
Answer: C,D
Explanation:
Explanation
In IS-IS, a designated intermediate system (DIS) is a router that is elected on a multi-access network segment (such as Ethernet) to perform some functions on behalf of other routers on the same segment. A DIS is responsible for sending network link-state advertisements (LSPs), which describe all the routers attached to the network. These LSPs are flooded throughout a single area. A DIS also generates pseudonode LSPs, which represent the multi-access network as a single node in the link-state database. A DIS election is based on the priority value configured on each router's interface connected to the multi-access network. The priority value ranges from 0 to 127, with higher values indicating higher priority. The router with the highest priority becomes the DIS for the area (Level 1, Level 2, or both). If routers have the same priority, then the router with the highest MAC address is elected as the DIS. By default, routers have a priority value of 64. On a multi-access network, each router only forms an adjacency to the DIS, not to every other router on the segment. This reduces the amount of hello packets and LSP
NEW QUESTION # 44
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. Add the external interface prefix to the IGP routing tables
- B. Add the internal interface prefix to the BGP routing tables.
- C. 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
- D. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy
Answer: A,D
Explanation:
Explanation
the default behavior for iBGP is to propagate EBGP-learned prefixes without changing the next-hop. This can cause issues if the next-hop is not reachable via the IGP. One solution is to use the next-hop self command on R4, which will change the next-hop attribute to its own loopback address. This way, R5 can reach the next-hop via the IGP and install the route in its routing table.
Another solution is to add the external interface prefix (120.0.4.16/30) to the IGP routing tables of R4 and R5.
This will also make the next-hop reachable via the IGP and allow R5 to use the route. According to 2, this is a possible workaround for a pure IP network, but it may not work well for an MPLS network.
NEW QUESTION # 45
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. Disable multipath.
- B. Ensure that the metric-out parameter on the Gigabit Ethernet interface is higher than the 10 Gigibit Ethernet interface.
- C. Enable per-prefix load balancing.
- D. Define a policy to tag routes with the appropriate bandwidth community.
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 # 46
You are configuring a Layer 3 VPN between two sites. You are configuring the vrf-target target:
65100:100 statement in your routing instance.
In this scenario, which two statements describe the vrf-target configuration? (Choose two.)
- A. This value is used to add a target community to BGP routes advertised to the local CE device.
- B. This value is used to add a target community to BGP routes advertised to the remote PE device.
- C. This value is used to identify BGP routes learned from the remote PE device.
- D. This value is used to identify BGP routes learned from the local CE device.
Answer: B,C
NEW QUESTION # 47
Which two statements are correct about IS-IS interfaces? (Choose two.)
- A. If a broadcast interface is in both L1 and L2, one combined hello message is sent for both levels.
- B. If a point-to-point interface is in both 11 and L2, one combined hello message is sent for both levels.
- C. If a point-to-point interface is in both L1 and L2, separate hello messages are sent for each level.
- D. If a broadcast interface is in both L1 and L2, separate hello messages are sent for each level.
Answer: C,D
NEW QUESTION # 48
Which statement is true regarding BGP FlowSpec?
- A. It is used to protect a network from denial-of-service attacks dynamically
- B. It verifies that the source IP of the incoming packet has a resolvable route in the routing table
- C. It uses a remote triggered black hole to protect a network from a denial-of-service attack.
- D. It uses dynamically created routing policies to protect a network from denial-of-service attacks
Answer: D
Explanation:
Explanation
BGP FlowSpec is a feature that extends the Border Gateway Protocol (BGP) to enable routers to exchange traffic flow specifications, allowing for more precise control of network traffic. The BGP FlowSpec feature enables routers to advertise and receive information about specific flows in the network, such as those originating from a particular source or destined for a particular destination. Routers can then use this information to construct traffic filters that allow or deny packets of a certain type, rate limit flows, or perform other actions1. BGP FlowSpec can also help in filtering traffic and taking action against distributed denial of service (DDoS) attacks by dropping the DDoS traffic or diverting it to an analyzer2. BGP FlowSpec rules are internally converted to equivalent Cisco Common Classification Policy Language (C3PL) representing corresponding match and action parameters2. Therefore, BGP FlowSpec uses dynamically created routing policies to protect a network from denial-of-service attacks.
References: 1: https://www.networkingsignal.com/what-is-bgp-flowspec/ 2:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-flowspe
NEW QUESTION # 49
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The JN0-664 exam is an important certification for service provider professionals who want to advance their careers and demonstrate their expertise in Juniper Networks technologies. It is a globally recognized certification that is widely respected in the industry and is a valuable credential for professionals who work with Juniper Networks technologies in service provider environments.
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