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| Section | Objectives |
|---|---|
| Layer 3 VPNs | - L3VPN Deployment
|
| BGP | - BGP Routing
|
| MPLS | - MPLS Fundamentals
|
| Layer 2 VPNs | - L2VPN Technologies
|
| IGP | - OSPF
|
| Multicast | - Multicast Routing
|
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NEW QUESTION # 94
Exhibit
CE-1 must advertise ten subnets to PE-1 using BGP Once CE-1 starts advertising the subnets to PE-1, the BGP peering state changes to Active.
Referring to the CLI output shown in the exhibit, which statement is correct?
Answer: D
Explanation:
Analyzing the Exhibit and Understanding the Issue
The exhibit shows BGP configurations on CE-1 and PE-1, which are connected via EBGP.
* CE-1 (Customer Edge)
* Uses AS 64511 and establishes an EBGP session with PE-1 (AS 65550).
* Configured to export 10 static routes (192.168.1.0/24 - 192.168.10.0/24) using the static-to-bgp policy.
* PE-1 (Provider Edge)
* Uses AS 65550 and is peering with CE-1 (AS 64511).
* Configured with a prefix-limit of 5 on received routes from CE-1.
* Teardown enabled, meaning if more than 5 prefixes are received, the BGP session is shut down.
Identifying the Problem
* CE-1 is correctly configured with peer AS 65550, so Option B ("CE-1 is configured with an incorrect peer AS") is incorrect #.
* CE-1 is advertising exactly 10 static routes (as per policy).
* PE-1 has a prefix-limit maximum 5 with teardown enabled.
* This means that when CE-1 advertises more than 5 prefixes, PE-1 shuts down the BGP session.
* BGP moves to the "Active" state, indicating that the session has been disrupted and PE-1 is trying to re-establish the connection.
* CE-1 is reachable since the session was initially established before the limit was exceeded, so Option D ("CE-1 is unreachable") is incorrect #.
* CE-1 is not advertising its entire routing table, only the static prefixes listed in the policy, so Option A ("CE-1 is advertising its entire routing table") is incorrect #.
Correct Answer
# C. The prefix limit has been reached on PE-1
Verification from Juniper Documentation
* Juniper BGP Prefix Limit Documentation confirms that exceeding the prefix limit with teardown causes the BGP session to go into "Active" state.
* Juniper Troubleshooting Guide for BGP Peering Issues states that when a BGP session reaches the prefix limit and has teardown enabled, the session is terminated.
NEW QUESTION # 95
Exhibit
Referring to the exhibit, which statement is correct?
Answer: B
Explanation:
Explanation
The route distinguisher (RD) is a BGP attribute that is used to create unique VPN IPv4 prefixes for each VPN in an MPLS network. The RD is a 64-bit value that consists of two parts: an administrator field and an assigned number field. The administrator field can be an AS number or an IP address, and the assigned number field can be any arbitrary value chosen by the administrator. The RD is prepended to the IPv4 prefix to create a VPN IPv4 prefix that can be advertised across the MPLS network without causing any overlap or conflict with other VPNs. In this question, we have two PE routers (PE-1 and PE-2) that are connected to two CE devices (CE-1 and CE-2) respectively. PE-1 and PE-2 are configured with VRFs named Customer-A and Customer-B respectively.
NEW QUESTION # 96
You are examining an L3VPN route that includes the information shown in the exhibit.
Which statement is correct in this scenario?
Answer: A
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 # 97
Referring to the exhibit, which two statements are true? (Choose two.)
Answer: C,D
NEW QUESTION # 98
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 # 99
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