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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Cutover | 7% | - Rollback procedures - Migration planning techniques |
| Topic 2: MPLS Technologies | 19% | - MPLS LDP and TE - MPLS VPN basics |
| Topic 3: IPv6 Routing | 20% | - OSPFv3/IS-IS for IPv6 - IPv6 static and dynamic routing |
| Topic 4: Advanced Ethernet Technologies | 10% | - VLAN and Ethernet enhancements - MAC/security features |
| Topic 5: Advanced BGP Features | 10% | - BGP policy controls - Route reflector and attributes |
| Topic 6: Advanced IGP Features | 17% | - IS-IS advanced optimisations - OSPF advanced capabilities |
| Topic 7: Network O&M | 7% | - Operation & maintenance best practices - Monitoring and health metrics |
| Topic 8: Troubleshooting | 10% | - Issue resolution strategies - Network diagnostics |
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NEW QUESTION # 138
On the network shown in the figure, IS-IS IPv6 runs on R2, R6, and R3, and the IPv6 address of Loopback0 on R6 is 2000::6/128. OSPFv3 runs on other links. Area 1 is a stub area, and Area 2 is an NSSA. IS-IS routes are imported to OSPFv3 on R2 and R3. Which of the following statements are false?
Answer: B,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To determine which statements are false, we need to understand how OSPFv3 and IS-IS work together, and how Inter-Area-Router LSAs (Type 3 LSAs) are generated in OSPF:
1. Understanding OSPF Inter-Area LSAs (Type 3)
* OSPF generates Type 3 LSAs (Inter-Area-Prefix LSAs) to advertise networks between areas.
* Only Area Border Routers (ABRs) generate Inter-Area LSAs.
* Type 3 LSAs allow routes to be advertised from one OSPF area to another (e.g., from Area 0 to Area 1 or Area 2).
2. Analysis of Each Answer Option:
# A. "R3 generates an Inter-Area-Router-LSA in Area 0." # TRUE
* R3 is an ABR (connecting IS-IS and OSPF Area 0).
* Since R3 is importing IS-IS routes into OSPFv3, it must generate Type 3 LSAs to advertise those routes in Area 0.
* This statement is correct.
# B. "R2 generates an Inter-Area-Router-LSA in Area 0." # TRUE
* R2 is also an ABR (connecting IS-IS and OSPF Area 0).
* Like R3, R2 imports IS-IS routes into OSPFv3 and advertises them into Area 0 using Type 3 LSAs.
* This statement is correct.
# C. "R1 generates an Inter-Area-Router-LSA in Area 2." # FALSE
* R1 is not an ABR.
* Only ABRs generate Type 3 LSAs, and R1 is not an ABR between Area 2 and Area 0.
* This statement is false.
# D. "R2 generates an Inter-Area-Router-LSA in Area 1." # FALSE
* Area 1 is a stub area, and stub areas do not allow Inter-Area-Router LSAs (Type 3 LSAs) for external routes.
* R2 does not generate Inter-Area LSAs in Area 1 because OSPF prevents this in stub areas.
* This statement is false.
NEW QUESTION # 139
In the network shown in the figure, adjacent routers use directly connected interfaces to establish EBGP neighbor relationships.
The Router ID of each device is 10.0.XX, and the AS number is 6500X, where X is the router number. R1 and R4 both have static routes to 192.168.1.0/24, which are introduced into BGP through import. R1 adds the Community attribute value (1:1) when sending routes to its neighbors. All routers in the network are enabled to pass community attributes. Which of the following can make the traffic path from R3 to 192.168.1.0/24 must pass through R4?
Answer: D
NEW QUESTION # 140
On the network shown in the figure, single-hop BFD is configured on R1 and R2. A network engineer finds that the BFD session goes down. To locate the fault, the network engineer queries the BFD configurations on R1 and R2. According to the configuration information marked in the figure, it can be determined that the mismatched time parameter settings on R1 and R2 causes the BFD session to go down.
Answer: A
Explanation:
# Configuration Snapshot:
On R1:
bash
CopyEdit
bfd toR2 bind peer-ip 10.0.12.2
discriminator local 1
discriminator remote 2
min-tx-interval 1500
min-rx-interval 1500
On R2:
bash
CopyEdit
bfd toR1 bind peer-ip 10.0.12.1
discriminator local 2
discriminator remote 1
# Observation:
* On R1 , both min-tx-interval and min-rx-interval are configured: 1500ms
* On R2 , no timing parameters are explicitly set (defaults are used)
# BFD Timing Behavior (Huawei):
* BFD is bidirectional and can work even if only one side configures the timers .
* As long as the peer can handle the intervals (i.e. doesn't violate capabilities), the session should still come up .
* This is not a mismatch fault . It ' s valid to set time parameters only on one side.
# Therefore, the time parameter mismatch is NOT the reason the session goes down.
# Final answer: B. FALSE
Root Cause (Likely):
* The real cause might be something else (e.g., interface down, ACL blocking BFD packets, wrong IP, or unidirectional loss).
* But not mismatched timers - they are allowed.
Official Huawei Extract:
" If only one end of the BFD session specifies the detection intervals, the BFD session can still be established. Huawei devices accept remote minimum intervals and negotiate accordingly. "
- [Huawei HCIA-Datacom Certification Guide - BFD Session Configuration and Troubleshooting]
NEW QUESTION # 141
As shown in the OSPF network, the area numbers are marked in the figure, where area 1 is a common area, area 2 is a Totally NSSA area, and area 3 is an NSSA area. R5 introduces the external route 10.0.5.5/32 into OSPF.
Which of the following routers have a route entry for 10.0.5.5/32 in their routing tables? (Multiple choice)
Answer: A,B,C,D
NEW QUESTION # 142
In the OSPF network shown in the figure, the link cost value has been marked in the figure. R1 has enabled OSPF IP FRR and configured the "maximum load-balancing 1" command in the OSPF process. Which of the following is the backup outbound interface for R1 to reach
10.0.3.3/32?
Answer: A
NEW QUESTION # 143
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