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| Section | Weight | Objectives |
|---|---|---|
| Network Cutover and Migration | 7% | - Service switchover and verification - Migration strategies and risk control |
| Advanced IGP Features | 17% | - IS-IS advanced features and convergence - IGP route selection and control - OSPF advanced features and optimization |
| Network Troubleshooting | 10% | - Fault diagnosis and analysis methods - Troubleshooting routing and switching issues |
| IPv6 Routing | 20% | - IPv6 addressing and transition technologies - OSPFv3 and IS-IS for IPv6 - BGP4+ and IPv6 route deployment |
| Network O&M | 7% | - Network monitoring and management tools - Performance optimization and capacity planning |
| MPLS Technologies | 19% | - MPLS VPN and traffic engineering - MPLS basics and label distribution - MPLS protection and fast reroute |
| Advanced BGP Features | 10% | - BGP path control and filtering - BGP route attributes and policies - Route reflectors and confederations |
| Advanced Ethernet Technologies | 10% | - VLAN stacking and QinQ - Ethernet OAM and protection mechanisms - Advanced link aggregation and reliability |
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NEW QUESTION # 45
In a BGP Confederation deployment within a large AS, which statement is correct?
Answer: A
NEW QUESTION # 46
On an enterprise network shown in the figure, EBGP is deployed between CEs and PEs .
CE1 sends a VPN route to PE1.
Which of the following statements are false?
Options:
Answer: A,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding Site of Origin (SoO) in MPLS VPNs
* SoO (Site of Origin) is used in MPLS VPNs to prevent loops in multi-homed CE scenarios.
* Routes with the same SoO value are not advertised back to the same site.
2. Analysis of Each Answer Choice
A). " To enable CE3 to receive the route, run the command peer 10.1.1.1 soo 200:1 on PE1. " ( # False)
* SoO is used to prevent loops by tagging routes that belong to the same site.
* Applying SoO (200:1) on PE1 for CE1 means that any other PE (such as PE2) receiving the route will not advertise it back to the same site (CE1).
* This statement is false because applying SoO here does not directly enable CE3 to receive the route. Instead, CE3 must accept routes with SoO values properly configured.
B). " If the commands peer 10.1.1.1 soo 200:1 and peer 10.1.2.1 soo 200:1 are run on PE1, CE2 accepts the route. " ( # False)
* SoO ensures that a route received from one CE is not sent back to another CE in the same site.
* If SoO (200:1) is assigned to CE1 and CE2, routes will be blocked because they share the same SoO tag.
* Thus, CE2 will not accept the route, making this statement false.
C). " If the command peer 10.1.3.1 substitute-as is run on PE2, CE3 accepts the route. " ( # True)
* substitute-as allows a router to replace the received AS number in the AS_PATH with another AS number, ensuring that routes are accepted even when AS_PATH filtering is in place.
* This prevents CE3 from rejecting the route due to AS-Path loop prevention.
* # Thus, this statement is true.
D). " If no additional action is taken, CE3 discards the route. " ( # True)
* By default, CE3 will discard the route because of BGP loop prevention (same AS in the AS_PATH).
* To allow CE3 to receive the route, the allowas-in or substitute-as command must be configured on PE2.
* # Thus, this statement is true.
3. Evaluating the Answer Choices
Option
Correct?
Reasoning
A
# False
Applying SoO does not directly enable CE3 to receive the route.
B
# False
If both CE1 and CE2 have the same SoO value, CE2 will reject the route.
C
# True
Substitute-AS allows CE3 to accept the route by modifying the AS-Path.
D
# True
Without additional configuration, CE3 will discard the route due to AS-Path loop prevention.
# Correct answer: A and B are false.
Final Conclusion:
* SoO prevents routing loops in MPLS VPN multi-homing.
* CE2 will reject the route if it has the same SoO as CE1.
* CE3 requires the substitute-as or allowas-in command to accept the route.
* Thus, statements A and B are false.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - BGP SoO and AS-Path Loop Prevention Huawei Official HCIP-Datacom Study Guide - MPLS VPN Route Control Huawei Documentation on BGP SoO and AS_PATH Filtering
NEW QUESTION # 47
Please match the characteristics and functions of the IS-IS protocol.
Answer:
Explanation:
NEW QUESTION # 48
In the OSPFv3 network shown in the figure, the interfaces of R1 and R2 both have two IPv6 addresses. Although the prefix lengths of the IPv6 addresses of R1 and R2 are different, they can still establish an OSPFv3 neighbor relationship. If R2 is the DR, then the Intra-Area-Prefix-LSA generated by R2 will contain four prefixes.
Answer: A
NEW QUESTION # 49
The figure shows information about an LSP (Link-State PDU) generated by an IS-IS router .
From the LSP, you can infer that the router is not the DIS (Designated Intermediate System) of the local link .
Options:
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the DIS (Designated Intermediate System) in IS-IS
* In IS-IS, the DIS (Designated Intermediate System) is similar to the DR (Designated Router) in OSPF .
* Unlike OSPF, IS-IS does not use an election based on priority; instead, the router with the highest priority becomes the DIS .
* If there is a tie in priority, the router with the highest MAC address on the interface becomes the DIS.
* The DIS is responsible for generating additional LSPs (pseudonode LSPs) for the link and synchronizing the database between routers.
2. How to Identify If the Router Is the DIS from the LSP
* In the given LSP output, there are NO pseudonode LSPs (LSPs ending with .01) .
* The DIS is responsible for creating pseudonode LSPs , which represent a multi-access network in the IS-IS topology.
* If the router were the DIS , it would generate both its own LSP (ending in .00) and a pseudonode LSP (ending in .01) .
* Since we only see an LSP ending in .00 , this confirms that the router is NOT the DIS .
3. Evaluating the Answer Choices
* Option A (TRUE) - Correct:
* Since no pseudonode LSP is present , the router is not the DIS .
* This confirms that the statement is TRUE .
* Option B (FALSE) - Incorrect:
* If the router were the DIS, it would generate pseudonode LSPs , but they are missing from the output.
* Therefore, the statement is NOT false .
Final answer:
HCIP-Datacom-Advanced Routing & Switching Technology References:
* IS-IS Designated Intermediate System (DIS) Selection Process
* Pseudonode LSP Generation in Multi-Access Networks
* IS-IS LSP Structure and Identification of DIS
NEW QUESTION # 50
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