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| Section | Objectives |
|---|---|
| Topic 1: BGP and Internet Routing | - BGP fundamentals
|
| Topic 2: IPv6 and Network Services | - IPv6 routing technologies
|
| Topic 3: Advanced Routing Protocols | - IS-IS Routing Protocol
|
| Topic 4: Network Design and Troubleshooting | - Troubleshooting methods
|
| Topic 5: MPLS and VPN Technologies | - VPN technologies
|
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NEW QUESTION # 14
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces.
* The router ID of each router is 10.0.X.X, and the AS number is 6500X, where X is the number of the router.
* Both R1 and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import- route command.
* The aggregate 192.168.1.0/16 detail-suppressed command is configured on R2.
Which of the following is the path for traffic from R3 to 192.168.1.0/24?
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the BGP Network Topology in the Question:
* EBGP Peering & Route Distribution
* Each router forms EBGP peer relationships with directly connected neighbors.
* BGP learns and propagates routes via EBGP neighbors.
* R1 and R4 advertise the static route 192.168.1.0/24 into BGP.
* Effect of the aggregate 192.168.1.0/16 detail-suppressed Command on R2
* R2 performs BGP route aggregation, summarizing 192.168.1.0/24 into a larger 192.168.1.0/16 route.
* The detail-suppressed option hides the more specific 192.168.1.0/24 prefix when advertising routes.
* As a result, R2 does not advertise the specific 192.168.1.0/24 route to its neighbors.
Route Selection and Traffic Flow Analysis:
* R1 and R4 originate 192.168.1.0/24 and advertise it via BGP.
* R2 does not advertise the 192.168.1.0/24 route because of the detail-suppressed command.
* R3 cannot learn the specific route from R2, so it must choose an alternative path via R5.
* R5 learns 192.168.1.0/24 from R1 and advertises it to R3.
* Thus, the best available path for R3 to reach 192.168.1.0/24 is R3 # R5 # R1.
# Correct Path: R3 # R5 # R1
Checking Each Option:
# Option A: R3 # R5 # R1 (Correct)
* R3 learns 192.168.1.0/24 from R5, and R5 forwards traffic to R1, which has the static route.
# Option B: R3 # R2 # R1 (Incorrect)
* R2 does not advertise 192.168.1.0/24 due to route summarization (detail-suppressed), so R3 cannot use R2 as the next hop.
# Option C: R3 # R6 # R5 # R1 (Incorrect)
* This is an unnecessary detour.
* R3 has a direct EBGP connection with R5, so it will use the shortest path (R3 # R5 # R1) instead of going through R6.
# Option D: R3 # R5 # R4 (Incorrect)
* R3 prefers the shortest AS path to reach 192.168.1.0/24.
* Since R1 and R4 both advertise the route, R3 will prefer the route via R5 to R1 rather than R4.
Final Conclusion:
# A. The correct path for traffic from R3 to 192.168.1.0/24 is R3 # R5 # R1.
Thus, the correct answer is: A.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - BGP Route Aggregation and Detail Suppression Huawei Official HCIP-Datacom Study Guide - BGP Best Path Selection and Aggregation Rules Huawei Documentation on BGP Route Summarization and Impact on Routing Decisions
NEW QUESTION # 15
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: A
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 # 16
In the network shown in the figure, R1, R2, R4, and R5 run IS-IS with area number 49.0001, and R3 and R6 run IS-IS with area number 49.0002.
Inside AS 65000, R1, R3, R4, and R6 all establish IBGP neighbor relationships with R2 and R5, where R2 and R5 are Rs and R1, R4, R3, and R6 are clients. IBGP neighbor relationships are all established using the Loopback0 interface. R2 and R5 also establish an IBGI neighbor relationship. The IP address of the Loopback0 interface of each device is 10.0.X.X/32, and the Router ID is 10.0.X.X, where X is the device number. R1 and R4 introduce the external network
192.168.1.0/24 into BGP through import. For 192.168.1.0/24, please match it according to the number of valid routes in the output information of "display bep routing-table".
Answer:
Explanation:
NEW QUESTION # 17
BFD session down will cause the direct link to fail.
Answer: A
NEW QUESTION # 18
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled and function as the gateways of PC1 and PC2, respectively .
Given this, which of the following statements are true?
Network Topology:
* R1:
* Interface GE0/0/0 : 10.0.12.1/24 (Connected to R2)
* Interface GE0/0/1 : 192.168.1.1/24 (Gateway for PC1)
R2:
* Interface GE0/0/0 : 10.0.12.2/24 (Connected to R1)
* Interface GE0/0/1 : 192.168.1.2/24 (Gateway for PC2)
Options:
Answer: A,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* Understanding the network connectivity:
* R1 and R2 are connected through 10.0.12.0/24 and running OSPF in Area 0.
* PC1 (192.168.1.11/24) is connected to R1 , and PC2 (192.168.1.12/24) is connected to R2 .
* Analyzing each option:
* Option A: " R2 cannot ping 10.0.12.1. " # Incorrect
* R2 is directly connected to 10.0.12.1/24 (R1) on GE0/0/0 , so it can ping this IP without any routing issues.
* Option B: " PC1 and PC2 cannot ping each other. " # Correct
* OSPF is only running between R1 and R2 . There is no indication that R1 and R2 are redistributing connected routes (192.168.1.0/24 and 192.168.1.0/24) into OSPF.
* As a result, R1 does not know how to reach 192.168.1.12 , and R2 does not know how to reach 192.168.1.11 , making communication between PC1 and PC2 impossible .
* Option C: " R1 cannot ping 192.168.1.2. " # Incorrect
* 192.168.1.2 is directly connected to R2 , and if R1 can reach R2 through OSPF, then R1 should be able to ping 192.168.1.2.
* Option D: " R1 cannot ping 192.168.1.12. " # Correct
* 192.168.1.12 is connected to R2 , but if R2 does not advertise this network to R1, R1 has no route to reach it .
* Since PC1 (192.168.1.11) and PC2 (192.168.1.12) are on different subnets, and there ' s no redistribution , R1 cannot reach PC2 ' s IP .
Key Takeaways and Fix Recommendations:
* To allow PC1 and PC2 to communicate , R1 and R2 must advertise their directly connected networks (192.168.1.0/24) in OSPF using the network command or by redistributing connected routes into OSPF.
* Command example:
makefile
CopyEdit
R1:
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
R2:
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
* This would allow R1 to learn about PC2 ' s network and R2 to learn about PC1 ' s network , enabling communication.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* HCIP-Datacom Official Certification Guide , Chapter on OSPF Network Design and Troubleshooting .
* Huawei Datacom Training Materials , Section on OSPF Inter-Area and External Route Advertisements .
* Huawei Datacom Configuration Guide , Command Reference for OSPF network advertisement and route redistribution .
NEW QUESTION # 19
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