BTW, DOWNLOAD part of PassCollection JN0-664 dumps from Cloud Storage: https://drive.google.com/open?id=1RK0V3XIpvT2jps1rL4jqPfoFYcdRH11_
The free demo JN0-664 practice question is available for instant download. Download the Juniper JN0-664 exam dumps demo free of cost and explores the top features of Juniper JN0-664 Exam Questions and if you feel that the Service Provider, Professional (JNCIP-SP) exam questions can be helpful in JN0-664 exam preparation then take your buying decision.
| Section | Objectives |
|---|---|
| Multicast | - Multicast Routing
|
| IGP | - IS-IS
|
| Layer 2 VPNs | - L2VPN Technologies
|
| MPLS | - RSVP and Traffic Engineering
|
| Layer 3 VPNs | - L3VPN Deployment
|
| BGP | - BGP Routing
|
Among global market, JN0-664 guide question is not taking up such a large share with high reputation for nothing. And we are the leading practice materials in this dynamic market. To facilitate your review process, all questions and answers of our JN0-664 test question is closely related with the real exam by our experts who constantly keep the updating of products to ensure the accuracy of questions, so all JN0-664 Guide question is 100 percent assured. It is a mutual benefit job, that is why we put every exam candidates’ goal above ours, and it is our sincere hope to make you success by the help of JN0-664 guide question and elude any kind of loss of you and harvest success effortlessly.
NEW QUESTION # 66
Exhibit
Based on the configuration contents shown in the exhibit, which statement is true?
Answer: C
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 # 67
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?
Answer: B
Explanation:
To determine the correct answer, let's analyze the BGP path selection process and identify which attribute would be considered next in this scenario.
Background on BGP Path Selection
When multiple paths to the same destination are received via BGP, the router uses a step-by-step process to select the best path. The order of attributes considered is as follows (simplified for this scenario):
Highest Local Preference : The path with the highest local preference is preferred.
Shortest AS Path : The path with the shortest AS path length is preferred.
Lowest Origin Code : Paths with an origin code of IGP are preferred over EGP, and EGP is preferred over Incomplete.
Lowest MED (Multi-Exit Discriminator) : If the first three attributes are identical, the path with the lowest MED value is preferred.
eBGP over iBGP : eBGP paths are preferred over iBGP paths.
IGP Metric to Next Hop : The path with the lowest IGP metric to the next-hop router is preferred.
Router ID : If all else is equal, the path from the router with the lowest Router ID is preferred.
Peer IP Address : As a last tiebreaker, the path from the peer with the lowest IP address is preferred.
Scenario Analysis
In this scenario:
You are receiving the 203.0.113.0/24 network via EBGP from two different autonomous systems (AS 64500 and AS 64501).
Both advertisements have identical local-preference values , AS-path lengths , and BGP origin codes .
Given that the first three attributes in the BGP path selection process are identical, the next attribute to consider is the MED (Multi-Exit Discriminator) value.
Analysis of the Options
Option A: Router ID
Incorrect : The Router ID is considered much later in the BGP path selection process, only after other attributes like MED and IGP metric have been evaluated. Since MED is still relevant here, Router ID is not the next attribute to consider.
Option B: MED value
Correct : The MED value is used to influence inbound traffic from neighboring ASes. When local preference, AS path length, and origin code are identical, the path with the lowest MED value is preferred. This makes MED the next attribute to consider in this scenario.
Option C: Peer IP Address
Incorrect : The peer IP address is a tiebreaker used only at the very end of the BGP path selection process, after all other attributes have been evaluated. It is not relevant here because MED has not yet been considered.
Option D: IGP Metric
Incorrect : The IGP metric to the next-hop router is considered after MED. Since MED is still relevant in this scenario, IGP metric is not the next attribute to evaluate.
Final Answer
The correct answer is:
B . MED value
Summary
When local preference, AS path length, and origin code are identical, the MED value is the next attribute considered in the BGP path selection process.
MED is used to influence how traffic enters your AS from neighboring ASes.
NEW QUESTION # 68
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?
Answer: A
Explanation:
Understanding the Problem in MPLS CoS Classification
How EXP Bits Are Used for CoS in MPLS
Traffic is sent from VPN-A Site-1 → CE-1 → PE-1 → P-1 → PE-2 → CE-2.
The MPLS LSP (Label Switched Path) from PE-1 to PE-2 is expected to carry MPLS EXP bits, which are used for Class of Service (CoS) classification.
PE-2 should classify traffic based on EXP bits received in the MPLS label.
What Happens with PHP (Penultimate Hop Popping)?
By default, the penultimate router (P-1) pops the top MPLS label before sending the packet to PE-2.
Since the EXP bits are in the top MPLS label, they get removed along with the label.
This means that PE-2 no longer sees the correct EXP bits, leading to incorrect traffic classification.
Solution: Configure Explicit-Null on PE-2
Explicit Null (explicit-null) must be configured on PE-2 to ensure that P-1 does NOT remove the MPLS label.
Instead of removing the label, P-1 will send a label of 0 (for IPv4) or 2 (for IPv6) to PE-2.
This preserves the MPLS EXP bits, allowing PE-2 to classify the traffic correctly.
Evaluating the Answer Choices Again
✅ B. Configure the explicit-null statement on PE-2.
Correct, because:
PE-2 is the egress LSR, where Ultimate Hop Popping (UHP) must be enabled.
Configuring explicit-null ensures that P-1 does not remove the label, preserving the EXP bits for CoS classification at PE-2.
Configuration on PE-2:
set protocols mpls explicit-null
Juniper Documentation Reference:
"Explicit-null must be configured on the egress LSR to prevent PHP from removing the top MPLS label, thereby preserving the EXP bits."
❌ A. Configure the explicit-null statement on PE-1.
Incorrect, because:
Explicit-null must be configured on the egress LSR (PE-2), not the ingress LSR (PE-1).
PE-1 only labels the traffic but does not control PHP behavior on P-1.
❌ C. Configure VPN prefix mapping for the PE-1_to_PE-2 LSP.
Incorrect, because:
VPN prefix mapping is used for mapping VPN routes to LSPs but does not solve the EXP bit issue.
The problem here is label removal (PHP), not route mapping.
❌ D. Set a static CoS value for the PE-1_to-PE-2 LSP.
Incorrect, because:
This does not preserve the original EXP bits, it only applies a static CoS value.
It's a workaround, not a fix.
Final answer: ✅ B. Configure the explicit-null statement on PE-2.
Key Takeaways
Penultimate Hop Popping (PHP) removes the outer MPLS label at P-1, which also removes the EXP bits used for CoS classification.
To keep EXP bits intact, configure explicit-null on the egress PE (PE-2).
This forces P-1 to send a label (0 for IPv4, 2 for IPv6) to PE-2, preserving the EXP bits for CoS classification.
Official Juniper Documentation Reference
Juniper MPLS CoS and PHP Behavior Guide
"To retain CoS EXP bits at the egress LSR, configure explicit-null on the egress PE. This prevents PHP from stripping the MPLS label before reaching the final PE router."
NEW QUESTION # 69
Exhibit
Which two statements about the configuration shown in the exhibit are correct? (Choose two.)
Answer: A,B
Explanation:
The provided configuration is for a routing instance named VPN-A on a Juniper PE (Provider Edge) router. Let's break it down:
* Instance Type: VRF
* The instance-type vrf; statement indicates that this is a Layer 3 VPN (L3VPN) using MPLS VPNs (RFC 4364 - BGP/MPLS IP VPNs).
* This confirms that Option D (A Layer 3 VPN is configured) is correct #.
* VRF Target and Interface Association
* The vrf-target target:64512:1234; defines the route target (RT) for importing and exporting VPN routes.
* The interface ge-0/0/1.0; binds this interface to the VRF.
* BGP Configuration for CE (Customer Edge) Peering
* The group CE section configures external BGP (EBGP) (type external;).
* The neighbor 10.0.0.1 is in AS 64512 (peer-as 64512;).
* The as-override; statement is used.
Evaluating the Answer Choices
# Option B: "This VPN connects customer sites that use the same AS number."
* The as-override; command allows multiple customer sites that use the same AS number (64512) to communicate over the service provider's MPLS network.
* Normally, BGP prevents routes with the same AS in the AS_PATH from being accepted. The as- override feature replaces the customer's AS number with the provider's AS, ensuring proper route advertisement.
# This statement is correct.
# Option A: "This VPN connects customer sites that use different AS numbers."
* If the customer sites had different AS numbers, there would be no need for as-override.
* The as-override feature is specifically used when all customer sites share the same AS number, ensuring that BGP routes are accepted.
# This statement is incorrect.
# Option C: "A Layer 2 VPN is configured."
* A Layer 2 VPN (L2VPN) configuration would typically use instance-type l2vpn; or EVPN/VPLS- related parameters (e.g., protocols l2vpn or protocols vpls).
* Since this configuration uses instance-type vrf; and BGP with a VRF target, it is clearly a Layer 3 VPN (L3VPN).
# This statement is incorrect.
# Option D: "A Layer 3 VPN is configured."
* The instance-type vrf; confirms this is an MPLS Layer 3 VPN (L3VPN).
* VRFs, BGP, and route targets (vrf-target) are specific to Layer 3 VPNs.
# This statement is correct.
# B. This VPN connects customer sites that use the same AS number.
# D. A Layer 3 VPN is configured.
Verification from Juniper Documentation:
* Juniper BGP/MPLS Layer 3 VPNs Guide confirms that instance-type vrf is used for L3VPNs.
* Juniper BGP Configuration Guide states that as-override is applied when customer sites use the same AS number.
* RFC 4364 (BGP/MPLS IP VPNs) explains how route targets and VRFs are used in L3VPN deployments.
NEW QUESTION # 70
What is the correct order of packet flow through configurable components in the Junos OS CoS features?
Answer: A
Explanation:
The correct order of packet flow through configurable components in the Junos OS CoS features is as follows:
Behavior Aggregate Classifier: This component uses a single field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined or user-defined values.
Input Policer: This component applies rate-limiting and marking actions to incoming traffic based on the forwarding class and loss priority assigned by the classifier.
Multifield Classifier: This component uses multiple fields in a packet header to classify traffic into different forwarding classes and loss priorities based on user-defined values and filters.
Forwarding Policy Options: This component applies actions such as load balancing, filtering, or routing to traffic based on the forwarding class and loss priority assigned by the classifier.
Fabric Scheduler: This component schedules traffic across the switch fabric based on the forwarding class and loss priority assigned by the classifier.
Output Policer: This component applies rate-limiting and marking actions to outgoing traffic based on the forwarding class and loss priority assigned by the classifier.
Scheduler/Shaper/RED: This component schedules, shapes, and drops traffic at the egress interface based on the forwarding class and loss priority assigned by the classifier.
Rewrite Marker: This component rewrites the code-point bits of packets leaving an interface based on the forwarding class and loss priority assigned by the classifier.
NEW QUESTION # 71
......
The main key to passing the JN0-664 exam is to use your time affectionately and grasp every topic so you can attempt the maximum number of questions in the actual JN0-664 Exam. By studying the questions mentioned in the prep material, the candidates have control over the exam anxiety in no time.
Interactive JN0-664 Course: https://www.passcollection.com/JN0-664_real-exams.html
BONUS!!! Download part of PassCollection JN0-664 dumps for free: https://drive.google.com/open?id=1RK0V3XIpvT2jps1rL4jqPfoFYcdRH11_