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| Section | Weight | Objectives |
|---|---|---|
| Network O&M | 7% | - Network monitoring and management tools - Performance optimization and capacity planning |
| Advanced BGP Features | 10% | - Route reflectors and confederations - BGP path control and filtering - BGP route attributes and policies |
| Advanced Ethernet Technologies | 10% | - VLAN stacking and QinQ - Advanced link aggregation and reliability - Ethernet OAM and protection mechanisms |
| Network Cutover and Migration | 7% | - Service switchover and verification - Migration strategies and risk control |
| IPv6 Routing | 20% | - IPv6 addressing and transition technologies - BGP4+ and IPv6 route deployment - OSPFv3 and IS-IS for IPv6 |
| Network Troubleshooting | 10% | - Troubleshooting routing and switching issues - Fault diagnosis and analysis methods |
| MPLS Technologies | 19% | - MPLS protection and fast reroute - MPLS basics and label distribution - MPLS VPN and traffic engineering |
| Advanced IGP Features | 17% | - OSPF advanced features and optimization - IGP route selection and control - IS-IS advanced features and convergence |
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NEW QUESTION # 45
According to this picture, what can we judge? (Multiple choice)
Answer: B,C,D
NEW QUESTION # 46
As shown in the figure, the network has a loop because STP is not enabled. Which of the following phenomena may be bowed?
Answer: A,B,C,D
NEW QUESTION # 47
An engineer uses two routers to test IPv6 services, and simulates the interconnection between the headquarters and branches by running BGP4+. As shown in the figure, an engineer captures the packet to view the update message sent by R1.
Regarding the description of the message information, which of the following statements is correct?
Answer: A
NEW QUESTION # 48
On the IS-IS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. Which of the following statements are true?
Answer: A,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Levels and Default Route Advertisement:
* R1 is a Level-1 router
* R2 is a Level-1-2 router (meaning it connects both Level-1 and Level-2 areas)
* R3 is a Level-2-only router
Step 1: What Does "default-route-advertise always level-1" Do?
* This command forces R1 to advertise a default route (0.0.0.0/0) to all its Level-1 IS-IS neighbors, regardless of whether R1 has a default route in its routing table.
* Since R1 is a Level-1 router, it does not participate in Level-2 routing, meaning it relies on R2 (a Level-1-2 router) for external connectivity.
Step 2: Checking the Routing Tables
* R1: Since it is only a Level-1 router and does not receive a default route from any higher-level router, it does not have a default route in its own routing table. # (D is correct)
* R2: Since R1 advertises the default route at Level-1, R2 (a Level-1-2 router) receives this default route in its Level-1 database. # (B is correct)
* R3: R3 is a Level-2-only router, and default routes are not automatically leaked between Level-1 and Level-2 unless explicitly configured.
* Since no explicit route leaking configuration is mentioned, R3 will not have the default route
# (C is incorrect).
* A is incorrect because the command successfully advertises a default route from R1 to Level-1 neighbors like R2.
Final answer: # B, D
References:
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - IS-IS Default Route Advertisement
* IS-IS Routing Level-1 and Level-2 Behavior
* IS-IS Route Leaking and Default Route Propagation
NEW QUESTION # 49
In a BGP/MPLS IP VPN network, if you want to modify the RD value of a VPN instance, you must first enable the address family corresponding to the VPN instance or delete the VPN instance.
Answer: B
NEW QUESTION # 50
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