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NEW QUESTION # 31
A network device has established an OSPF neighbor relationship with another device. The figure shows the configuration of GE0/0/0 on the network device.
Which of the following commands would NOT affect the OSPF neighbor status of the interface?
Answer: D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To determine the correct answer, we need to analyze how each command impacts OSPF neighbor relationships.
1. Understanding OSPF Neighbor Formation
OSPF routers form neighbor relationships when they meet the following conditions:
* They are in the same subnet (IP addresses and subnet masks must match).
* They are in the same OSPF area.
* They use the same network type (e.g., Broadcast, Point-to-Point).
* Authentication (if configured) must match.
* Hello and Dead timers must match.
2. Analyzing Each Answer Option
# A. "undo ip address 10.0.12.2 24" # Affects OSPF Neighbor Status
* Removing the IP address will prevent the interface from sending and receiving OSPF Hello packets.
* Without an IP address, OSPF cannot establish neighbor relationships.
* Effect: Breaks OSPF neighbor status.
# B. "undo description" # Does NOT Affect OSPF Neighbor Status
* The interface description is just a label for administrators and has no impact on OSPF functionality.
* It does not affect neighbor relationships, routing, or communication.
* Effect: No impact on OSPF neighbors.
# C. "undo ospf cost" # Affects OSPF Neighbor Status Indirectly
* OSPF cost determines the path selection but does NOT break the neighbor relationship.
* However, if the cost change leads to routing table recalculations, it might cause temporary convergence issues.
* Effect: Does not directly break neighbor status, but affects route selection.
# D. "undo ospf dr-priority" # Affects OSPF Neighbor Status (Possibly Causes DR Re-Election)
* OSPF DR/BDR election uses priority values.
* If changed, a new election might occur, leading to a temporary loss of neighbor relationships.
* Effect: Might cause OSPF neighbor reset (temporary impact on adjacency).
NEW QUESTION # 32
On the IS-IS IPv6 network shown in the figure, if you check the LSDB on R1, the command output shows that R1 is the DIS.
Answer: A
Explanation:
To determine whether R1 is the DIS (Designated Intermediate System) in IS-IS, you analyze the LSDB (Link-State Database) output from the command:
bash
CopyEdit
display isis lsdb
In IS-IS, the DIS creates and advertises Pseudonode LSPs with the LSP ID format:
perl
CopyEdit
< system-id > . < 00-FF > . < 00 >
In the output shown:
scss
CopyEdit
0000.0000.0001.00-00* < - Normal LSP (R1)
0000.0000.0001.01-00* < - Pseudonode LSP (indicates R1 is DIS)
0000.0000.0002.00-00 < - Normal LSP (R2)
# The LSP 0000.0000.0001.01-00 * is a Pseudonode LSP , and it belongs to R1 (0000.0000.0001). This LSP is only generated by the DIS on a broadcast network segment.
# The presence of the Pseudonode LSP for R1 confirms that:
* R1 is acting as the DIS .
* The asterisk (*) next to the LSPs also means R1 owns them and they are local to R1 .
# Final answer: A. TRUE
Official Huawei Extract:
" In IS-IS, the DIS is responsible for generating a Pseudonode LSP on broadcast networks. The LSP ID of a Pseudonode ends with .01-00. The presence of this LSP in the LSDB confirms that the router is acting as the DIS. "
- [Huawei HCIA-Datacom Certification Guide - IS-IS Chapter: DIS and LSP Types]
NEW QUESTION # 33
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 # 34
When the hardware of a network device fails, you can usually use the replacement method, such as replacing the optical module, replacing the board, replacing the power module, etc. When performing the above operations, you need to wear an anti-static wrist strap.
Answer: B
NEW QUESTION # 35
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.
By default, among the routes received by R6 regarding 192.168.1.0/24, which of the following has the longest AS_path?
Answer: C
NEW QUESTION # 36
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