PRACTICE JN0-664 TEST - JN0-664 PDF

Practice JN0-664 Test - JN0-664 PDF

Practice JN0-664 Test - JN0-664 PDF

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q62-Q67):

NEW QUESTION # 62
Referring to the exhibit. PIM-SM is configured on all routers, and Anycast-RP with Anycast-PIM is used for the discovery mechanism on RP1 and RP2. The interface metric values are shown for the OSPF area.

In this scenario, which two statements are correct about which RP is used? (Choose two.)

  • A. Source2 will use RP1 and Receiver2 will use RP1 for group 224.2.2.2.
  • B. Source1 will use RP1 and Receiver1 will use RP2 for group 224.1.1.1.
  • C. Source1 will use RP1 and Receiver1 will use RP1 for group 224.1.1.1.
  • D. Source2 will use RP2 and Receiver2 will use RP2 for group 224.2.2.2.

Answer: A,C


NEW QUESTION # 63
Click the Exhibit button.

Referring to the exhibit, which statement is correct?

  • A. VPN routes are exported with only the target:65512:1 route target
  • B. You cannot use the vrf-target and vrf-export statements in the same VRF.
  • C. VPN routes with the target:65512:1 and target:65512:2 route targets are imported.
  • 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 # 64

Click the Exhibit button.
You are troubleshooting an issue for a customer site that uses 10.10.0.0/24 in AS 65224, but you see another AS in the AS path.
Referring to the exhibit, what is the cause of the problem?

  • A. AS 65000 is pre-pending AS 65137 to route advertisements.
  • B. The local AS is in the process of withdrawing the route from AS 65137.
  • C. The local AS is receiving two equal cost routes to 10.10.0.0/24.
  • D. AS 65137 is advertising the 10.10.0.0/24 prefix.

Answer: A

Explanation:
In the given exhibit, you are observing the BGP routing information for the prefix 10.10.0.0/24. The AS path for this prefix shows `65000 {65137 65224}`. To understand the issue, let's analyze each aspect of the information provided and the options given:
1. **AS Path Analysis**:
- The AS path attribute in BGP is a list of AS numbers that a route advertisement has traversed.
- In this case, the AS path `65000 {65137 65224}` indicates that the route to 10.10.0.0/24 has been advertised through AS 65000, which includes AS 65137 and AS 65224.
2. **Understanding AS Path Prepending**:
- AS path prepending is a technique used by AS administrators to artificially lengthen the AS path.
- By adding their own AS number multiple times into the AS path, they make a route less attractive to others.
- Here, AS 65000 is showing `65137` as part of its AS path, suggesting it might be prepending to manipulate routing decisions.
3. **Options Analysis**:
- **Option A**: "AS 65000 is pre-pending AS 65137 to route advertisements."
- This option suggests that AS 65000 is deliberately adding AS 65137 to the AS path. This matches the observed AS path, where AS 65000 has prepended `65137`.
- Therefore, this is the correct explanation.
- **Option B**: "The local AS is receiving two equal cost routes to 10.10.0.0/24."
- There is no evidence in the exhibit to support the presence of two equal-cost routes.
- **Option C**: "The local AS is in the process of withdrawing the route from AS 65137."
- Route withdrawal would not cause the AS path to include `65000 {65137 65224}`.
- **Option D**: "AS 65137 is advertising the 10.10.0.0/24 prefix."
- While AS 65137 is part of the path, it does not explain the presence of AS 65000 in the path, making this option incorrect.
**Conclusion**:
The AS path `65000 {65137 65224}` is indicative of AS 65000 prepending AS 65137. Therefore, the correct answer is:
**A. AS 65000 is pre-pending AS 65137 to route advertisements.**
**References**:
- Juniper Networks documentation on BGP AS path manipulation and prepending techniques.
- BGP Best Practices and Routing Policies: [Juniper Networks BGP Best
Practices](https://www.juniper.net/documentation/en_US/junos/topics/concept/bgp-best-practices-routing-policie
- RFC 4271, A Border Gateway Protocol 4 (BGP-4): [RFC 4271](https://tools.ietf.org/html/rfc4271) which describes the behavior and attributes of BGP, including AS path prepending.


NEW QUESTION # 65
CE-1 and CE-2 are part of a VPLS called Customer1. No connectivity exists between CE-1 and CE-2. In the process of troubleshooting, you notice PE-1 is not learning any routes for this VPLS from PE-2, and PE-2 is not learning any routes for this VPLS from PE-1.

Referring to the exhibit, which statement is correct?

  • A. The route target must match on PE-1 and PE-2.
  • B. The instance type should be changed to l2vpn.
  • C. The no-tunnel-services statement should be deleted on both PEs.
  • D. The route distinguisher must match on PE-1 and PE-2.

Answer: A


NEW QUESTION # 66
Which two statements are correct about reflecting inet-vpn unicast prefixes in BGP route reflection? (Choose two.)

  • A. Clients add their originator ID when advertising routes to their route reflector
  • B. Route reflectors do not change any existing BGP attributes by default when advertising routes.
  • C. A BGP peer does not require any configuration changes to become a route reflector client.
  • D. Route reflectors add their cluster ID to the AS path when readvertising client routes.

Answer: B,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 # 67
......

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