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| Section | Weight | Objectives |
|---|---|---|
| Advanced BGP Features | 10% | - BGP route attributes and policies - Route reflectors and confederations - BGP path control and filtering |
| Network Troubleshooting | 10% | - Troubleshooting routing and switching issues - Fault diagnosis and analysis methods |
| Advanced Ethernet Technologies | 10% | - Ethernet OAM and protection mechanisms - Advanced link aggregation and reliability - VLAN stacking and QinQ |
| Network O&M | 7% | - Network monitoring and management tools - Performance optimization and capacity planning |
| IPv6 Routing | 20% | - OSPFv3 and IS-IS for IPv6 - BGP4+ and IPv6 route deployment - IPv6 addressing and transition technologies |
| MPLS Technologies | 19% | - MPLS protection and fast reroute - MPLS VPN and traffic engineering - MPLS basics and label distribution |
| Advanced IGP Features | 17% | - OSPF advanced features and optimization - IGP route selection and control - IS-IS advanced features and convergence |
| Network Cutover and Migration | 7% | - Service switchover and verification - Migration strategies and risk control |
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NEW QUESTION # 202
VLAN aggregation is configured on a switched network. Sub-VLAN 2 and Sub-VLAN 3 are added to Super-VLAN 10.
To enable hosts in different Sub-VLANs to communicate with each other, run the _____ inter-sub- vlan- proxy enable command in the view of VLANIF 10, corresponding to the Super-VLAN.
(Enter the answer in lowercase letters only.)
Answer:
Explanation:
supervlan
NEW QUESTION # 203
On the network shown in the figure, the DHCP server function is enabled on GE0/0/0 of R2, and the address pool is an interface address pool.
When GE0/0/0 and GE0/0/1 of R1 function as DHCP clients, only one interface can obtain an IP address by default.
Options:
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the DHCP Process in This Scenario:
* DHCP Server on R2:
* The DHCP server is configured on interface GE0/0/0 of R2.
* The address pool is an interface address pool, meaning that IP addresses are allocated from the subnet of GE0/0/0 (i.e., 10.0.12.0/24).
* DHCP Clients on R1:
* Both interfaces (GE0/0/0 and GE0/0/1) on R1 are set as DHCP clients, meaning they will send DHCP DISCOVER messages to obtain an IP address dynamically.
* Why Only One Interface Gets an IP Address?
* Interface address pools in Huawei devices assign only one IP address per MAC address (which is typically the router's MAC).
* Since both interfaces belong to R1, they share the same MAC address when making a DHCP request.
* As a result, the DHCP server on R2 only assigns one IP address to the first requesting interface.
* The second request is ignored or denied by the DHCP server due to the duplicate MAC address issue.
Key Takeaways:
* Huawei routers using an interface-based DHCP address pool assign only one IP per MAC address.
* Since both interfaces on R1 have the same MAC, only one gets an IP.
* This behavior is expected in Huawei's HCIP-Datacom-certified DHCP configurations.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide, Chapter on DHCP Server and Client Configurations.
* Huawei Datacom Configuration Guide, Section on Interface Address Pools and Address Assignment Limitations.
* Huawei Enterprise Networking Training Materials, DHCP Relay and DHCP Server Behavior.
NEW QUESTION # 204
The route reflector and its clients form a cluster, using the unique Cluster ID in the AS as an identifier. When a route is reflected by the RR for the first time, if there is no Cluster_List attribute, the RR will add the local Cluster ID to the front of the Cluster_List. If a route already has the Cluster_List attribute, the RR will no longer modify the Cluster_List attribute.
Answer: B
NEW QUESTION # 205
On the network shown in the figure, OSPF runs on R1, R2, and R3, and OSPF BFD is enabled. R1 and R3 use loopback interfaces to establish an iBGP peer relationship. If GE0/0/1 of R2 is shut down, which of the following is the longest period after which the BGP peer relationship of R1 will change from Up to Down?
Answer: A
Explanation:
# Key Facts from the Scenario:
* OSPF runs between R1-R2-R3.
* iBGP peer relationship is established between loopback interfaces of R1 and R3 .
* BGP does not detect link failures directly because it runs over loopbacks and relies on the underlying routing protocol (OSPF here).
* BFD (Bidirectional Forwarding Detection) is enabled with OSPF to provide fast failure detection .
# What Happens If GE0/0/1 on R2 Fails?
* The OSPF adjacency between R2 and R3 fails.
* Normally, OSPF would take up to 40 seconds (default dead interval) to detect this.
* However, with BFD enabled , the failure can be detected in as little as 1 second (depending on timers).
* Huawei typically configures BFD with a default detection time of around 3 seconds unless specifically tuned lower.
# Impact on BGP:
* Since the route to R3's loopback disappears quickly due to BFD detection, R1 loses the next-hop reachability to R3.
* As a result, the iBGP session between R1 and R3 will go Down within approximately 3 seconds .
# Therefore, the maximum period before BGP peering drops is 3 seconds.
# Final answer: C. 3s
Official Huawei Extract:
" BFD provides fast link failure detection for protocols such as OSPF. When BFD is enabled, the failure detection time can be reduced to milliseconds or a few seconds, allowing upper-layer protocols like BGP to react quickly to routing failures. "
- [Huawei HCIA-Datacom Certification Guide - OSPF Fast Convergence and BFD Integration Chapter]
NEW QUESTION # 206
On the OSPF network shown in the figure, area 1 is an NSSA, area 2 is a common area, and R4 imports an external route 10.0.4.4/32. The router ID of each router is 10.0.X.X, where X is the router number. If the asbr-summary 10.0.4.0 255.255.255.0 command is run in the OSPF processes of R1 and R3, which of the following routers have the route 10.0.4.0/24 in their routing tables?
Answer: A,C
Explanation:
Step 1: Understanding OSPF Areas and Summarization
* Area 1 (NSSA - Not So Stubby Area)
* Allows external routes but converts Type-5 LSAs into Type-7 LSAs.
* External routes must be translated by an ABR into Type-5 LSAs before being propagated into other areas.
* Area 2 (Common Area - Regular OSPF Area)
* Supports both inter-area and external routes.
* asbr-summary 10.0.4.0 255.255.255.0 Command
* This command summarizes all external routes within 10.0.4.0/24 into a single summarized route.
* Since it is applied on R1 and R3, these routers will advertise 10.0.4.0/24 instead of 10.0.4.4/32 to their respective areas.
Step 2: Route Distribution Analysis
* R4 (Originating Router in NSSA - Area 1)
* R4 injects 10.0.4.4/32 as a Type-7 LSA into Area 1.
* R1 (ABR between Area 1 & Area 0, Summarizing Route)
* Since R1 is an ABR, it translates Type-7 LSAs from Area 1 into a summarized Type-5 LSA (10.0.4.0/24) for Area 0.
* # R1 has 10.0.4.0/24 in its routing table.
* R2 (Inside Backbone Area 0, No ASBR Summary Applied Here)
* R2 only receives Type-5 LSAs from R1 but does not summarize them.
* Since R2 is not explicitly summarizing, it will likely still see 10.0.4.4/32 rather than 10.0.4.0
/24.
* # R2 does not have 10.0.4.0/24.
* R3 (ABR between Area 0 & Area 2, Summarizing Route)
* R3 is also an ABR and has the asbr-summary 10.0.4.0/24 command configured.
* It will advertise the summarized route 10.0.4.0/24 into Area 2.
* # R3 has 10.0.4.0/24 in its routing table.
* R5 (Inside Area 2, No Direct Connectivity to External Routes)
* Since R3 summarizes 10.0.4.0/24, R5 (inside Area 2) will receive only summarized routes.
* # R5 has 10.0.4.0/24.
Final answer: # R1, R3 (Option A, C)
References:
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF Route Summarization
* OSPF NSSA and Type-7 to Type-5 LSA Translation
NEW QUESTION # 207
......
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