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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: OSPF | 15-20% | - LSA types, flooding, and route summarization - Virtual links, authentication, and routing policy - Single-area and multi-area configuration and monitoring - OSPFv2 and OSPFv3 concepts and operation |
| Topic 2: BGP | 20-25% | - Policy-based routing, filtering, and route manipulation - Attributes, communities, and multipath routing - Inter-AS routing and advanced BGP features - iBGP, eBGP, route reflection, and confederations |
| Topic 3: IS-IS | 15-20% | - DIS operation and routing policy implementation - Metrics, route summarization, and route leaking - Configuration and monitoring for single/multi-area - IS-IS levels, areas, and operation |
| Topic 4: Class of Service (CoS) | 10-15% | - Traffic classification, marking, and policing - Queue scheduling, shaping, and congestion management - CoS configuration and monitoring in service provider networks |
| Topic 5: IP Multicast | 10-15% | - RPF check, multicast distribution trees, and troubleshooting - Multicast integration with IGP and BGP - IGMPv2/v3, PIM dense mode, sparse mode, and SSM |
| Topic 6: VPNs and MPLS | 20-25% | - MPLS architecture, LDP, RSVP-TE, and label switching - Layer 2 VPNs, LDP circuits, VPLS, and EVPN - Layer 3 VPNs: VRF, MP-BGP, route distinguishers, targets - VPN configuration, monitoring, and troubleshooting |
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NEW QUESTION # 41
You are configuring a BGP signaled Layer 2 VPN across your MPLS enabled core network. In this scenario, which statement is correct?
Answer: A
NEW QUESTION # 42
Referring to the exhibit, which two statements are true? (Choose two.)
Answer: B,D
NEW QUESTION # 43
Which two statements are correct about VPLS tunnels? (Choose two.)
Answer: A,B
Explanation:
https://www.juniper.net/documentation/us/en/software/nce/feature-guide-virtual-private-lan-service/topics/task
/vpls-ldp-signaling-solutions.html
https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/topics/concept/vpns-configuring-vpls- routing-instances.html#id-11510150__id-11568648
NEW QUESTION # 44
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: B
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 # 45
You are configuring schedulers to define the class-of-service properties of output queues. You want to control packet drops during periods of congestion.
In this scenario, which CoS configuration parameter would be used to accomplish this task?
Answer: C
Explanation:
When configuring Class of Service (CoS) properties for output queues, we need to manage packet drops during periods of congestion. Juniper's CoS framework provides several tools to manage congestion, including drop profiles, buffer sizes, and scheduling mechanisms. Let's break down each option and identify the correct one.
Evaluating the Answer Choices
# D. drop profile (Correct Answer)
* Why?
* A drop profile defines when packets should be dropped based on the queue fill level.
* Random Early Detection (RED) or Tail Drop can be used to manage congestion by discarding lower-priority packets first.
* Drop profiles are configured under the scheduler to determine how aggressive packet dropping should be during congestion.
* Example Juniper Configuration:
schedulers {
best-effort {
drop-profile low-drop;
}
}
drop-profiles {
low-drop {
fill-level 80 drop-probability 50;
}
}
* fill-level 80 # When the queue reaches 80% full, packet drops begin.
* drop-probability 50 # There is a 50% chance of dropping packets once the threshold is reached.
# Official Juniper Documentation Reference:
# Junos Class of Service Configuration Guide
"A drop profile determines how packets are discarded based on the queue fill level, allowing control over congestion behavior." Why the Other Options Are Incorrect?
# A. buffer size (Incorrect)
* Why?
* The buffer size determines how many packets the queue can store before congestion occurs.
* A larger buffer can delay drops, but it does not actively control dropping behavior.
* It affects latency rather than controlling packet drops.
# B. priority (Incorrect)
* Why?
* Priority controls which queue gets serviced first, not how drops are handled.
* Higher priority queues are serviced before lower-priority queues, but this does not prevent congestion-related drops.
# C. shaping rate (Incorrect)
* Why?
* Shaping limits the maximum transmission rate of the queue.
* While shaping helps reduce congestion, it does not control which packets get dropped during congestion.
* Shaping is useful for traffic smoothing, but it does not actively drop packets based on queue fill levels.
# D. drop profile
* Controls packet drops based on queue congestion.
* Defines RED (Random Early Detection) or Tail Drop mechanisms.
* Directly influences drop probability as the queue fills up.
# Official Juniper Reference:
"Drop profiles are used to manage congestion by determining when and how aggressively packets are dropped based on queue fill level."
NEW QUESTION # 46
......
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