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| Section | Objectives |
|---|---|
| Topic 1: IP Network Technologies | - IS-IS Routing Protocol
|
| Topic 2: Network Services and Optimization | - Multicast Technologies
|
| Topic 3: Network Design and Troubleshooting | - Enterprise Network Design
|
| Topic 4: MPLS and VPN Technologies | - MPLS Fundamentals
|
| Topic 5: Advanced Routing Protocols | - OSPF Advanced Features
|
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NEW QUESTION # 83
Regarding sham link, which of the following description is wrong?
Answer: A
NEW QUESTION # 84
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers.
The ipv6 default-route-advertise always level-1 command is configured in the IS-IS process of R4.
Which of the following routers does not have the default route in its routing table?
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Network Structure in the Question:
* IS-IS Area IDs and Router Roles
* Area 49.0001 (Level-1-2): Contains R1, R2, R4 (all Level-1-2 routers).
* Area 49.0002 (Level-1-2 & Level-1): Contains R3 (Level-1-2) and R5 (Level-1 only).
* Key Command Used: ipv6 default-route-advertise always level-1
* This command forces R4 to advertise a default route (::/0) to all Level-1 routers within its area.
* Only Level-1 routers in the same area as R4 will receive the default route.
* Level-2 routers do not receive or propagate this default route unless additional configuration is done.
Route Distribution Analysis:
* R4 (Level-1-2) is configured to advertise a default route to Level-1 routers.
* R1 and R2 (both Level-1-2) are in the same area (49.0001) as R4, so they receive the default route.
* R3 (Level-1-2) is in area 49.0002 but connects to R4 (49.0001), meaning it can receive the default route through its Level-1 connection.
* R5 (Level-1 only) is in area 49.0002, but R4 does not propagate the default route to another Level-
1 area (49.0002).
* Since R5 is a Level-1 router and does not have a Level-2 connection, it cannot receive the default route from R4.
Final Conclusion:
# R1 receives the default route.# R2 receives the default route.# R3 receives the default route.# R5 does NOT receive the default route.
Thus, the correct answer is: C. R5.
NEW QUESTION # 85
Network administrators can run the clock timezone command to set the time zone of a device. If two network devices have different time zone settings, they cannot establish a neighbor relationship using a dynamic routing protocol.
Options:
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* The clock timezone command only affects the displayed time on the device and does not impact routing protocol operations.
* Dynamic routing protocols such as OSPF, IS-IS, BGP, and EIGRP rely on timers, authentication, and correct network configurations, but they do not require the same time zone settings.
* Potential issues with different time zones:# Log timestamps may be inconsistent, making troubleshooting harder.# Time-sensitive features like NTP synchronization might be affected.# But different time zones will not prevent dynamic routing neighbor relationships.
# Reference: HCIP-Datacom Advanced Routing & Switching Technology - System Time Configuration
& Routing Protocols
NEW QUESTION # 86
On the OSPF network shown in the figure, a network engineer finds that R1 and R2 have the same router ID, and both have imported default routes (with the default-route-advertise always command configured). Given this, which of the following statements is false?
Answer: A
NEW QUESTION # 87
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers.
* The IPv6 address of Loopback0 on R4 is 2000::4/128.
* The command ipv6 summary 2000::/64 level-1-2 is configured in the IS-IS process of R4.
Which of the following statements is false?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Network and IPv6 Route Summary Behavior
* IS-IS Areas and Router Roles:
* Area 49.0001 (Level-1-2): R1, R2, R4
* Area 49.0002 (Level-1-2 & Level-1): R3 (Level-1-2), R5 (Level-1 only)
* Effect of ipv6 summary 2000::/64 level-1-2 Command on R4
* Route summarization in IS-IS allows an L1-L2 router (R4) to aggregate IPv6 prefixes and advertise a summary route (2000::/64) into both Level-1 and Level-2 areas.
* This means R4 will advertise only 2000::/64 instead of specific /128 routes (like 2000::4/128).
* All Level-1 and Level-2 routers connected to R4 will receive the summary route 2000::/64 instead of the detailed /128 routes.
Route Distribution Analysis for Each Statement
A). The routing table of R1 contains the route 2000::4/128. # (True)
* R1 is a Level-1-2 router in the same area (49.0001) as R4, so it receives both the summarized 2000::/64 route and the more specific 2000::4/128 route.
* Since R1 is directly connected to R4, it can still learn the 2000::4/128 route.
# Statement A is true.
B). The routing table of R3 contains the route 2000::/64. # (True)
* R3 is a Level-1-2 router, meaning it can receive both Level-1 and Level-2 routes.
* Since R4 (a Level-1-2 router) advertises the summarized 2000::/64 route into both levels, R3 will receive 2000::/64 in its routing table.
# Statement B is true.
C). The routing table of R2 contains the route 2000::/64. # (True)
* R2 is a Level-1-2 router in the same area as R4, meaning it receives the summarized 2000::/64 route.
* This is expected behavior since R4 advertises the summary route into both Level-1 and Level-2 areas.
# Statement C is true.
D). The routing table of R5 does not contain the route 2000::/64. # (False - Correct Answer)
* R5 is a Level-1 router, meaning it can only receive Level-1 routes unless a default route is provided.
* Since R3 (a Level-1-2 router) learns 2000::/64, it can propagate it into the Level-1 area (49.0002).
* This means R5 will receive the summary route 2000::/64 from R3.
* Thus, R5 does contain 2000::/64, making this statement false.
# Statement D is false (correct answer).
Final Conclusion:
# A. The routing table of R1 contains the route 2000::4/128. (True)
# B. The routing table of R3 contains the route 2000::/64. (True)
# C. The routing table of R2 contains the route 2000::/64. (True)
# D. The routing table of R5 does not contain the route 2000::/64. (False - Correct Answer) Thus, the correct answer is: D. The routing table of R5 does not contain the route 2000::/64 (False Statement).
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - IS-IS Route Summarization and IPv6 Multi-Topology Huawei Official HCIP-Datacom Study Guide - IS-IS L1/L2 Routing and IPv6 Summarization Commands Huawei Documentation on IPv6 Route Summary Behavior in IS-IS
NEW QUESTION # 88
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