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The JN0-664 exam tests the candidate's knowledge of Juniper Networks Junos operating system, as well as their ability to configure, troubleshoot, and maintain Juniper Networks Service Provider Routing and Switching platforms. JN0-664 Exam is best suited for network engineers, administrators, and technicians who work with Juniper Networks Service Provider Routing and Switching platforms.

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q88-Q93):

NEW QUESTION # 88
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 L2 routers.
B. Configure the ignore-attached-bit parameter on all L1 routers
C. Configure all routers to be L1.
D. Configure all routers to allow wide metrics.

Answer: B

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 # 89
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. scheduler
B. forwarding classes
C. rewrite rules
D. output policer

Answer: C

NEW QUESTION # 90
Which origin code is preferred by BGP?

A. Internal
B. Null
C. Incomplete
D. External

Answer: C

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 # 91
The environment is using BGP. All devices are in the same AS with reachability redundancy.
Referring to the exhibit, which statement is correct?

A. Peering is dynamically discovered between all devices.
B. Client1 is peered to Client2 and Client3.
C. RR2 is in an OpenConfirm State until RR1 becomes unreachable.
D. RR1 is peered to Client2 and RR2.

Answer: D

NEW QUESTION # 92
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 identify BGP routes learned from 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 add a target community to BGP routes advertised to the local CE device.
D. This value is used to identify BGP routes learned from the remote PE device.

Answer: B,D

Explanation:
The `vrf-target` statement in a Layer 3 VPN configuration is used to control the import and export of VPN routes by attaching a target community to the routes. This helps in defining which VPN routes should be imported into or exported from a particular VRF (Virtual Routing and Forwarding) instance.
1. **Understanding VRF Target**:
- The `vrf-target` statement specifies the extended community attributes (route targets) that are used to control the import and export of routes in a VRF.
- These attributes help in identifying which routes should be shared between different VRFs, particularly across different PE (Provider Edge) devices.
2. **Statements Analysis**:
- **A. This value is used to identify BGP routes learned from the local CE device.**
- Incorrect. The `vrf-target` attribute is not used to identify routes learned from the local CE device. It is used to manage routes between PE devices and within the provider's MPLS network.
- **B. This value is used to identify BGP routes learned from the remote PE device.**
- Correct. The `vrf-target` value helps in identifying which routes from remote PE devices should be imported into the local VRF. It essentially acts as a filter for importing BGP routes with matching target communities.
- **C. This value is used to add a target community to BGP routes advertised to the local CE device.**
- Incorrect. Routes advertised to the local CE device do not use the `vrf-target` attribute. Instead, these routes are typically managed within the local VRF routing table.
- **D. This value is used to add a target community to BGP routes advertised to the remote PE device.**
- Correct. When advertising routes from the local PE to remote PE devices, the `vrf-target` value is added to these routes. This target community ensures that the correct routes are shared across the VPN.
**Conclusion**:
The correct statements about the `vrf-target` configuration in a Layer 3 VPN scenario are:
**B. This value is used to identify BGP routes learned from the remote PE device.**
**D. This value is used to add a target community to BGP routes advertised to the remote PE device.**
**Reference**:
- Juniper Networks Documentation on VRF Target: [VRF Target Configuration](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/layer-3-vpns.html)
- MPLS and VPN Architectures by Ivan Pepelnjak and Jim Guichard

NEW QUESTION # 93
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