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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Troubleshooting | 10% | - Fault diagnosis and analysis methods - Troubleshooting routing and switching issues |
| Topic 2: Network Cutover and Migration | 7% | - Migration strategies and risk control - Service switchover and verification |
| Topic 3: Advanced Ethernet Technologies | 10% | - Advanced link aggregation and reliability - VLAN stacking and QinQ - Ethernet OAM and protection mechanisms |
| Topic 4: Advanced IGP Features | 17% | - OSPF advanced features and optimization - IS-IS advanced features and convergence - IGP route selection and control |
| Topic 5: IPv6 Routing | 20% | - OSPFv3 and IS-IS for IPv6 - IPv6 addressing and transition technologies - BGP4+ and IPv6 route deployment |
| Topic 6: Advanced BGP Features | 10% | - Route reflectors and confederations - BGP path control and filtering - BGP route attributes and policies |
| Topic 7: Network O&M | 7% | - Performance optimization and capacity planning - Network monitoring and management tools |
| Topic 8: MPLS Technologies | 19% | - MPLS VPN and traffic engineering - MPLS basics and label distribution - MPLS protection and fast reroute |
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NEW QUESTION # 120
Which of the following is not added for IS-IS to support IPv6 route processing and calculation?
The source IP address of IS-IS Hello packets is changed to the link-local address.
TLV 232, which is equivalent to the IP Interface Address TLV in IPv4, except that the original 32-bit IPv4 address is changed to a 128-bit IPv6 address.
Answer: B
Explanation:
The option lettering in the supplied question is malformed. In the standard option order, the source-IP statement is option B, and it is the item that was not added for IS-IS IPv6.
Unlike OSPFv3, IS-IS operates directly over the data-link layer rather than being encapsulated in IPv4 or IPv6. Consequently, an IS-IS Hello PDU does not have an IP header or an IP source address that could be changed to an IPv6 link-local address.
To support IPv6 route processing, IS-IS was extended with the following information:
* TLV 232 - IPv6 Interface Address: Carries one or more 128-bit IPv6 interface addresses.
* TLV 236 - IPv6 Reachability: Carries IPv6 prefixes, metrics and reachability attributes.
* IPv6 NLPID: The value 142 (0x8E) identifies IPv6 as a supported network-layer protocol and is carried when IPv6 reachability is advertised.
Therefore, TLV 232, TLV 236 and the IPv6 NLPID are valid IS-IS IPv6 extensions. Changing an IS-IS Hello packet's source IP address is not one of them. Huawei IS-IS documentation
NEW QUESTION # 121
I-SPF and PRC can speed up ISIS route convergence. PRC does not calculate nodes. Instead, it updates routes based on the shortest path tree (SPT) calculated using the SPF algorithm.
Answer: B
NEW QUESTION # 122
In order to prevent traffic flooding caused by broadcast storm, the administrator plans to deploy traffic suppression function in the inbound direction of the device interface view. Which of the following parameters can be used to suppress broadcast packets? (Multiple choice)
Answer: B,C,D
NEW QUESTION # 123
On the OSPF network shown in the figure, area 1 and area 2 are common areas . The IP address of Loopback0 on R5 is 10.0.5.5/32 , and OSPF is enabled on this interface . If the abr-summary 10.0.5.0
255.255.255.0 command is run in area 2 (where R1 resides) , which of the following routers have the route
10.0.5.0/24 in their routing tables?
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Step 1: Understanding OSPF Areas and Summarization
* Loopback0 on R5 has IP 10.0.5.5/32 and is advertised into OSPF.
* The abr-summary 10.0.5.0 255.255.255.0 command is applied in area 2 on R1 , which means:
* Instead of advertising individual host routes (like 10.0.5.5/32), R1 advertises the summarized route 10.0.5.0/24 into Area 0 (Backbone) .
* This summarized route is then propagated into other areas via Area 0 (Backbone) .
Step 2: Analyzing the Routing Table of Each Router
* R5 (Originating Router in Area 2)
* R5 only knows 10.0.5.5/32 because it ' s the originating router.
* The abr-summary command does not affect R5 itself.
* # R5 does not have 10.0.5.0/24.
* R1 (ABR for Area 2, Summarizing the Route)
* R1 creates and advertises 10.0.5.0/24 into Area 0 .
* This summary route is sent to other areas via Area 0.
* R2 (Connected to Area 0 & Area 1)
* Since R2 is part of Area 0 (Backbone), it receives 10.0.5.0/24 from R1 .
* # R2 has 10.0.5.0/24 in its routing table.
* R3 (Connected to Area 0 & Area 2)
* Since R3 is also connected to Area 0, it receives the summary route 10.0.5.0/24 from R1 .
* # R3 has 10.0.5.0/24 in its routing table.
* R4 (In Area 1, which is not directly connected to Area 2)
* R4 belongs to Area 1 , and unless explicitly advertised through inter-area summarization, it will not have 10.0.5.0/24 .
* Since no specific mention of summary advertisement into Area 1 is made, R4 does not get
10.0.5.0/24 .
* # R4 does not have 10.0.5.0/24.
Final answer: # R2, R3 (Option B, C)
References:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF Route Summarization OSPF Inter-Area Route Advertisement via ABRs OSPF Backbone (Area 0) Behavior and Route Distribution
NEW QUESTION # 124
According to this figure, it can be known that in VLAN 300, from 17:22:38 to 17:22.44,00e0-fc3d-3bdB. 0 MA, C flaps occurred on 2020-06-04.
Answer: B
NEW QUESTION # 125
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