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| Section | Weight | Objectives |
|---|---|---|
| MPLS Technologies | 19% | - MPLS fundamentals and label distribution - MPLS OAM and protection - LDP and RSVP-TE protocols - MPLS VPN (L3VPN, L2VPN) |
| Network Cutover | 7% | - Pre-cutover verification - Post-cutover validation - Cutover planning and risk assessment - Implementation and rollback strategy |
| Network Troubleshooting | 10% | - Structured troubleshooting methodology - Switching and link fault handling - Performance and service fault resolution - Routing protocol fault diagnosis |
| Advanced IGP Features | 17% | - IS-IS advanced features
|
| Advanced Ethernet Technologies | 10% | - QinQ and VLAN mapping - VLAN aggregation and MUX VLAN - Port isolation and security features - Ethernet link aggregation and reliability |
| Advanced BGP Features | 10% | - BGP multi-homing and load balancing - BGP route selection and attributes - Routing policies and filtering - Route reflectors and confederations |
| IPv6 Routing | 20% | - Transition mechanisms (dual-stack, tunnel, translation) - IPv6 address planning and configuration - OSPFv3 and IS-IS for IPv6 - BGP4+ for IPv6 |
| Network O&M | 7% | - Routine maintenance procedures - Configuration management and backup - Log and alarm management - Network monitoring and performance analysis |
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NEW QUESTION # 91
The file information shown in the figure exists on the R2 device. When the network engineer uses the "dir | exclude 1" command to view the file information, which of the following files will be seen?
Answer: C
NEW QUESTION # 92
What is the command to adjust the link cost value of an IS-IS interface?
Answer: B
NEW QUESTION # 93
On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. In AS 65000, R1, R3, R4, and R6 each establish iBGP peer relationships with R2 and R5. R2 and R5 are RRs (Route Reflectors), and R1, R4, R3, and R6 are clients. The iBGP peer relationships are established using Loopback0 on each router, and the router ID is 10.0.0.X/32, where X is the number of the router. R1 and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import- route command. Which of the following statements are true?
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:This question involves IS-IS, iBGP, and route reflection, but unlike Question 2, it does not mention the import-route isis level-2 into level-1 command. We'll re- analyze each statement, considering the possibility of multiple correct answers, and ensure alignment with HCIP-Datacom principles.
A: The routing table of R4 contains two equal-cost default routes.
* Analysis:
* R4 is a Level-1/Level-2 router in area 49.0001. It can learn default routes from Level-2 routers (R2, R5) if they advertise them (e.g., via default-route-advertise).
* The question does not specify default route advertisement or equal-cost paths. IS-IS prefers the closest Level-2 router, and the topology suggests a single path (e.g., via R2 or R5), not two equal- cost paths.
* Without ECMP or specific configuration, R4 would not have two equal-cost default routes.
* Conclusion: This statement is false.
B: The route 192.168.1.0/24 in the routing table of R3 has two next hops.
* Analysis:
* The route 192.168.1.0/24 is imported into BGP by R1 and R4 (in area 49.0001) and reflected by R2 and R5 to their iBGP clients, including R3 (in area 49.0002).
* The next-hop for this route, as received via iBGP, would typically point to R1 or R4 unless next- hop-self is configured on R2 or R5.
* R3, in area 49.0002 (Level-2), needs an IS-IS path to reach R1 or R4 (in area 49.0001). Without the import-route isis level-2 into level-1 command (not mentioned here), standard IS-IS behavior applies: Level-2 routers (R3) cannot directly learn Level-1 routes unless redistributed or via Level-2 connectivity.
* R3 relies on IS-IS Level-2 routes via R2 or R5 to reach R1/R4. The question does not indicate multiple equal-cost IS-IS paths from R3 to R1 and R4 (e.g., via both R2 and R5 with the same cost).
* Without ECMP or equal-cost paths, R3 would use a single next hop to reach 192.168.1.0/24.
* However, if R2 and R5 both reflect the route with the same cost to R1 and R4, and IS-IS provides equal-cost paths to both next-hops, R3 could have two next hops if ECMP is enabled.
* The topology and lack of cost details suggest this is unlikely without explicit configuration, making this statement false in standard scenarios.
* Conclusion: This statement is false, as there's no clear evidence of ECMP or equal-cost paths.
C: The routing table of R1 does not contain the route 192.168.2.0/24.
* Analysis:
* The route 192.168.2.0/24 is imported into BGP by R3 and R6 (in area 49.0002) and reflected by R2 and R5 to their iBGP clients, including R1 (in area 49.0001).
* iBGP ensures the route is propagated within AS 65000, so R1, as an iBGP client, will receive
192.168.2.0/24.
* R1, in area 49.0001 (Level-1/Level-2), needs an IS-IS path to the next-hop (R3 or R6). Without the import-route isis level-2 into level-1 command, standard IS-IS behavior applies: Level-1 routers (R1) cannot learn Level-2 routes (to R3, R6) unless redistributed or via Level-2 connectivity through R2 or R5.
* Since R2 and R5 are Level-2 routers connecting the areas, R1 can learn IS-IS routes to R3 and R6 via Level-2, allowing it to resolve the next-hop and install 192.168.2.0/24 in its routing table.
* Therefore, R1's routing table contains 192.168.2.0/24, making this statement false.
* Conclusion: This statement is false.
D: For 192.168.1.0/24, R3 preferentially selects the BGP route received from R2, and R6 preferentially selects the BGP route received from R5.
* Analysis:
* The route 192.168.1.0/24 is imported into BGP by R1 and R4 (in area 49.0001) and reflected by R2 and R5 to their iBGP clients, including R3 and R6 (in area 49.0002).
* In iBGP, when R3 and R6 receive the same route from multiple RRs (R2 and R5), they select the best path based on BGP attributes. If attributes like AS path, MED, and local preference are equal, BGP prefers the route with the lowest router ID of the advertising RR.
* The router IDs are 10.0.0.2 for R2 and 10.0.0.5 for R5. By default, both R3 and R6 would prefer the route from R2 (lower router ID, 10.0.0.2 < 10.0.0.5).
* However, the statement specifies that R3 prefers R2's route and R6 prefers R5's route, which would require specific BGP configurations (e.g., local preference, MED, or community attributes) to override the default router ID preference.
* The question does not mention such configurations, but the statement's wording suggests an implied or configured scenario common in HCIP-Datacom exams.
* If R2 and R5 are configured with different local preferences or other attributes for their clients (e.
g., R2 sets a higher local preference for R3, and R5 sets a higher local preference for R6), this could result in R3 preferring R2's route and R6 preferring R5's route.
* Given the exam context and the possibility of multiple correct answers, D is true if we interpret the statement as reflecting a configured scenario where R3 and R6 have been set up to prefer routes from R2 and R5, respectively, for 192.168.1.0/24. This aligns with typical HCIP-Datacom questions testing BGP path selection policies.
* Conclusion: This statement is true, based on the implied or configured BGP path selection in the exam context.
NEW QUESTION # 94
On a BGP/MPLS IP VPN network, _ _ is used to distinguish IPv4 prefixes with the same address space. In this case, IPv4 addresses are called VPNv4 addresses. (Enter the acronym in uppercase.)
Answer:
Explanation:
RD
Explanation:
The required acronym is RD , meaning Route Distinguisher .
Different customers connected through a BGP/MPLS IP VPN can use overlapping private IPv4 address spaces. An ordinary IPv4 prefix such as 10.1.1.0/24 is therefore insufficient to uniquely identify a customer route in the service provider's MP-BGP VPN routing table.
A PE adds an eight-byte RD to the IPv4 prefix, creating a globally unique VPNv4 route. Two customers may use the same IPv4 prefix, but different RDs make their VPNv4 routes distinct. For example:
RD 100:1 + 10.1.1.0/24
RD 200:1 + 10.1.1.0/24
These are separate VPNv4 routes.
The RD must not be confused with a Route Target. An RD distinguishes overlapping prefixes , whereas an RT controls which VPN instances import or export routes . Huawei documentation explicitly states that RDs distinguish IPv4 prefixes using the same address space and that IPv4 routes containing RDs are called VPN-IPv4 or VPNv4 routes. Huawei BGP/MPLS IP VPN concepts
NEW QUESTION # 95
In the OSPF network shown in the figure, area 1 is an NSSA area, area 2 is a common area, and R4 imports external route 10.0.4.4/32. The Router ID of each device is 10.0.0.X, where X is the device number.
The "asbr-summary 10.0.4.0 255.255.255.0" command is configured in the OSPF processes of R1 and R3. Which of the following routers have routing entries for 10.0.4.0/24 in their routing tables? (Multiple choice)
Answer: A,D
NEW QUESTION # 96
......
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