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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network O&M | 7% | - Data collection - Routine maintenance |
| Topic 2: Network Cutover | 7% | - Basic cutover concepts - Migration process |
| Topic 3: Advanced IGP Features | 17% | - IS-IS advanced features - Route control - OSPF advanced features - Fast convergence |
| Topic 4: Advanced BGP Features | 10% | - BGP route control - Advanced BGP features - Route reflectors - Inter-domain routing optimization |
| Topic 5: Network Troubleshooting | 10% | - Structured troubleshooting processes - Troubleshooting methods |
| Topic 6: MPLS Technologies | 19% | - MPLS VPN applications - MPLS principles - MPLS configuration - MPLS forwarding |
| Topic 7: Advanced Ethernet Technologies | 10% | - Ethernet security - VLANs |
| Topic 8: IPv6 Routing | 20% | - IS-IS for IPv6 - OSPFv3 - IPv6 static routes - BGP4+ |
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NEW QUESTION # 97
The figure shows the logical network architecture of a migration project. The purpose of the migration is to add network device R4 between R2 and R3.
* OSPF runs between network devices.
* After the physical network is connected, a network engineer incorrectly imports the backup configuration of R3 to R4 during the migration.
Given this, which of the following statements are true?
Options:
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding OSPF Neighbor Relationships
* OSPF (Open Shortest Path First) forms neighbor relationships based on these key conditions:
* Routers must be in the same OSPF area.
* The subnet mask and network type must match.
* The Hello/Dead timers must match.
* Authentication (if enabled) must match.
2. Analyzing the Given Scenario
* R1 and R2 are in Area 0 (Backbone Area).
* R3 and R4 are in Area 1 (Non-Backbone Area).
* R4 was configured incorrectly using R3's backup configuration, which could cause issues.
3. Evaluating Each Answer Option
* Option A: "The OSPF neighbor relationship between R1 and R2 is not affected."
* Correct.
* R1 and R2 are both in Area 0 and their configuration was not changed.
* Since R4 was added only between R2 and R3, it does not impact R1 and R2.
* # A is correct.
* Option B: "An OSPF neighbor relationship can be established between R2 and R4."
* Incorrect.
* R2 is in Area 0, but R4 is incorrectly configured using R3's backup, which likely placed it in Area 1.
* OSPF neighbors cannot form across different areas unless an Area Border Router (ABR) is properly configured.
* Since there is no indication of an ABR setup, the adjacency will fail.
* # B is incorrect.
* Option C: "An OSPF neighbor relationship can be established between R3 and R4."
* Correct.
* R3 and R4 are both in Area 1, and R4's backup configuration comes from R3, meaning they likely have identical settings.
* Since they share the same area and are directly connected, an OSPF adjacency is possible.
* # C is correct.
* Option D: "An OSPF neighbor relationship can be established between R1 and R3."
* Incorrect.
* R1 is in Area 0, and R3 is in Area 1.
* OSPF does not form neighbor relationships between different areas unless configured as an ABR, which is not mentioned.
* # D is incorrect.
Final Answer:
# A and C are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* OSPF Neighbor Formation and Area Design Principles
* Troubleshooting OSPF Area Mismatches and Configuration Issues
* OSPF Backbone Area (Area 0) and Inter-Area Communication
NEW QUESTION # 98
In an intra-domain MPLS VPN network, when a data packet enters the public network and is forwarded, it will be encapsulated with two layers of MPLS labels. Which of the following description is wrong about the two layers of labels? (Multiple choice)
Answer: A,C
NEW QUESTION # 99
How many bits are there in the label field of PLS?
Answer: B
NEW QUESTION # 100
The figure shows information about VPN1 on a PE (Provider Edge) router in a BGP/MPLS IP VPN network.
When the VPNv4 route corresponding to VPN1 is advertised to the remote PE, which VPNs of the remote PE will accept the route?
VPN1 Configuration:
ip vpn-instance VPN1
ipv4-family
route-distinguisher 100:1
vpn-target 100:1 200:1 300:1 export-extcommunity
VPN Import Policies on the Remote PE:
Answer: D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding Route Targets (RT) and Route Distribution in MPLS VPN
* MPLS Layer 3 VPNs (L3VPNs) use BGP to distribute VPN routes across multiple Provider Edge (PE) routers.
* Each VPN instance (VRF) is configured with Route Targets (RTs) to control which VPN routes are imported/exported.
* Route Distinguishers (RDs) are unique per VRF but do not affect route selection.
2. Analyzing VPN1 Configuration
* VPN1 is exporting routes with the following Route Targets (vpn-target values):
* 100:1
* 200:1
* 300:1
* Remote VPNs will import these routes only if their import RT list matches one of the exported RTs.
3. Matching Exported RTs with Import RTs in Remote VPNs
Remote VPN
Import RTs
Matches VPN1 Exported RTs (100:1, 200:1, 300:1)?
Accepts the Route?
VPN1
100:1
# Matches 100:1
# Yes
VPN2
200:1, 400:1
# Matches 200:1
# Yes
VPN3
100:1, 300:1
# Matches 100:1, 300:1
# Yes
VPN4
500:1
# No match
# No
# VPN1, VPN2, and VPN3 accept the route.# VPN4 does not accept the route because 500:1 is not in the export list of VPN1.
Final Conclusion:
# Correct answer: VPN1, VPN2, and VPN3 will accept the route.# VPN4 does not accept the route because there is no matching RT.
Thus, the correct answer is:# A. VPN1: Import RT=100:1# B. VPN2: Import RT=200:1, 400:1# C. VPN3:
Import RT=100:1, 300:1# D. VPN4: Import RT=500:1 (No match, does not accept the route).
NEW QUESTION # 101
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.
* R1 adds a community attribute (1:1) to the route before advertising it to its peers.
* All routers are configured to propagate community attributes.
* R3 is configured with a routing policy that rejects routes with the community attribute 1:1.
In this case, 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:
* BGP Peering & Route Distribution
* Each router forms EBGP peer relationships with directly connected neighbors.
* R1 and R4 import the static route 192.168.1.0/24 into BGP and advertise it to their peers.
* Community attributes are attached to routes to influence routing policies.
* Effect of Community Attribute 1:1
* R1 marks 192.168.1.0/24 with community 1:1 before advertising it.
* R3 has a policy that rejects any routes with community attribute 1:1.
* Since R1's advertisement contains 1:1, R3 will not accept 192.168.1.0/24 from R2.
Route Selection and Traffic Flow Analysis:
* R1 advertises 192.168.1.0/24 with community 1:1 to R2.
* R3 rejects this route from R2 because of the configured routing policy.
* R4 also advertises 192.168.1.0/24 to its EBGP neighbors without community 1:1.
* R5 learns the route from R4 and advertises it to R3.
* Since R5's advertisement does not include community 1:1, R3 accepts the route from R5.
* 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 # R2 # R4 (Incorrect)
* R3 does not learn the route from R2 because it rejects community 1:1.
* Since R1 added 1:1, and R2 propagated the same community, R3 will not accept this path.
# Option B: R3 does not have a route to 192.168.1.0/24 (Incorrect)
* R3 does have a route, but it learns it from R5 instead of R2.
# Option C: R3 # R2 # R1 (Incorrect)
* R1 marked the route with 1:1, and R2 advertised it with the same community.
* Since R3 rejects 1:1 routes, it will not use this path.
# Option D: R3 # R5 # R1 (Correct)
* R5 learns the route from R4, which does not have community 1:1, and advertises it to R3.
* R3 accepts this route and forwards traffic to R5, which sends it to R1.
Final Conclusion:
# D. The correct path for traffic from R3 to 192.168.1.0/24 is R3 # R5 # R1.
Thus, the correct answer is: D.
NEW QUESTION # 102
......
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