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[General] Juniper JN0-664 Reliable Exam Labs | JN0-664 Latest Exam Materials

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【General】 Juniper JN0-664 Reliable Exam Labs | JN0-664 Latest Exam Materials

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q72-Q77):NEW QUESTION # 72
Which two statements describe PIM-SM? (Choose two.)
  • A. Routers without receivers must periodically prune themselves from the SPT.
  • B. Traffic is only forwarded to routers that request to join the distribution tree.
  • C. Routers with receivers send join messages to their upstream neighbors.
  • D. Traffic is initially flooded to all routers and an S,G is maintained for each group.
Answer: B,C

NEW QUESTION # 73
Which three mechanisms are used by Junos platforms to evaluate incoming traffic for CoS purposes? (Choose three )
  • A. fixed classifiers
  • B. rewrite rules
  • C. behavior aggregate classifiers
  • D. multifield classifiers
  • E. traffic shapers
Answer: A,C,D
Explanation:
Explanation
Junos platforms use different mechanisms to evaluate incoming traffic for CoS purposes, such as:
* Behavior aggregate classifiers: These classifiers use a single field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined or user-defined values.
* Fixed classifiers: These classifiers use a fixed field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined values.
* Multifield classifiers: These classifiers use multiple fields in a packet header to classify traffic into different forwarding classes and loss priorities based on user-defined values and filters.
Rewrite rules and traffic shapers are not used to evaluate incoming traffic for CoS purposes, but rather to modify or shape outgoing traffic based on CoS policies.

NEW QUESTION # 74
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. output policer
  • D. rewrite rules
Answer: D
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/document ... rvice-overview.html)
- Junos OS CoS Configuration Guide: [Rewrite
Rules](https://www.juniper.net/document ... -rewrite-rules.html

NEW QUESTION # 75
Click the Exhibit button.

Referring to the exhibit, which statement is correct?
  • A. VPN routes with the target:65512:1 and target:65512:2 route targets are imported.
  • B. You cannot use the vrf-target and vrf-export statements in the same VRF.
  • C. VPN routes are exported with only the target:65512:1 route target
  • D. VPN routes are exported with the target:65512:1 and target:65512:2 route targets.
Answer: D
Explanation:
The exhibit shows the configuration of a VRF (Virtual Routing and Forwarding) instance on a Juniper PE router. Let's break down the key components:
VRF Configuration (VPN-A)
The instance type is VRF, meaning this is an L3VPN (Layer 3 VPN).
The routing instance contains a static route (10.1.0.0/16 next-hop 10.1.0.1).
The interface ge-0/0/2.0 is assigned to the VRF.
Route Distinguisher (RD): 172.17.20.1:1
VRF-Export Policy: vpn-a-export
VRF-Target: target:65512:1 (This defines which routes will be imported into the VRF).
VRF Export Policy (vpn-a-export)
The vpn-a-export policy adds two BGP communities (route targets) to exported VPN routes:
community add vpn-a-target;
community add vpn-m-target;
accept;
The vpn-a-target community corresponds to target:65512:1.
The vpn-m-target community corresponds to target:65512:2.
Policy-Options (Community Definitions)
community vpn-a-target members target:65512:1;
community vpn-m-target members target:65512:2;
This confirms that routes exported from this VRF will have BOTH target:65512:1 and target:65512:2.
Evaluating the Answer Choices
✅ Option A: "VPN routes are exported with the target:65512:1 and target:65512:2 route targets." The vpn-a-export policy explicitly adds both vpn-a-target (65512:1) and vpn-m-target (65512:2) to exported routes.
This is correct. ✅
❌ Option B: "You cannot use the vrf-target and vrf-export statements in the same VRF." This is incorrect.
Juniper allows the use of both vrf-target and vrf-export in the same VRF:
vrf-target is used for importing routes.
vrf-export defines export policies (which can add additional route targets).
This is incorrect. ❌
❌ Option C: "VPN routes with the target:65512:1 and target:65512:2 route targets are imported." The vrf-target target:65512:1; statement only controls importing routes.
The import policy does not include target:65512:2, so routes tagged with target:65512:2 alone would not be imported into this VRF.
This is incorrect. ❌
❌ Option D: "VPN routes are exported with only the target:65512:1 route target." The export policy (vpn-a-export) clearly adds both 65512:1 and 65512:2.
This is incorrect. ❌
Final answer:
✅ A. VPN routes are exported with the target:65512:1 and target:65512:2 route targets.
Verification from Juniper Documentation
Juniper MPLS L3VPN Configuration Guide confirms that vrf-target is used for importing, while vrf-export can be used for exporting multiple route targets.
Juniper Routing Policy Documentation states that export policies can add multiple BGP communities (route targets).
RFC 4364 (BGP/MPLS IP VPNs) defines the use of route targets for VPN route control.

NEW QUESTION # 76
Which two statements are correct about reflecting inet-vpn unicast prefixes in BGP route reflection? (Choose two.)
  • A. A BGP peer does not require any configuration changes to become a route reflector client.
  • 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. Route reflectors add their cluster ID to the AS path when readvertising client routes.
Answer: A,C
Explanation:
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 # 77
......
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