H12-821_V1.0 PASS4SURE EXAM PREP | H12-821_V1.0 EXAM PAPERS

H12-821_V1.0 Pass4sure Exam Prep | H12-821_V1.0 Exam Papers

H12-821_V1.0 Pass4sure Exam Prep | H12-821_V1.0 Exam Papers

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Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions (Q29-Q34):

NEW QUESTION # 29
An enterprise office network runs OSPF and is divided into multiple OSPF areas. Enterprise network engineers can configure route summarization on ASBRs to reduce the number of inter-area Type 3 LSAs, which in turn reduces the routing table size and improves device resource utilization.

  • A. TRUE
  • B. FALSE

Answer: B

Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:To answer this question, it is essential to distinguish between the roles of ABRs and ASBRs in OSPF and the function of route summarization:
* Route Summarization on ABRs:
* Route summarization in OSPF can reduce the number of inter-area Type 3 LSAs that ABRs propagate between areas.
* ABRs perform route summarization to reduce the amount of routing information exchanged between areas, thereby decreasing the size of the routing table and improving resource utilization.
* Route Summarization on ASBRs:
* ASBRs summarize external routes (from outside OSPF) into Type 5 LSAs or Type 7 LSAs (in NSSAs).
* ASBR route summarization does not impact inter-area Type 3 LSAs because ASBRs are responsible for importing and summarizing external routes, not summarizing routes between OSPF areas.
Since the statement refers to configuring route summarization on ASBRs to reduce inter-area Type 3 LSAs, it is incorrect. Route summarization for inter-area Type 3 LSAs must be configured on ABRs, not ASBRs.
Correct Statement: Route summarization on ABRs reduces the number of inter-area Type 3 LSAs.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "OSPF Route Summarization".
* RFC 2328 - OSPF Version 2.


NEW QUESTION # 30
On a network, some switches are enabled with RSTP and some switches are enabled with STP. What will happen?

  • A. STP and RSTP are compatible with each other, but the rapid convergence of RSTP is unavailable.
  • B. A Huawei switch changes from RSTP to STP. After the STP-enabled switch is removed from the network, the RSTP-enabled switch can be moved back to the RSTP mode.
  • C. A Huawei switch changes its mode from STP to RSTP. After the RSTP-enabled switch is removed from the network, the STP-enabled switch can be moved back to the RSTP mode.
  • D. STP and RSTP calculation are performed independently.

Answer: A,B

Explanation:
When STP and RSTP coexist in a network, RSTP switches will downgrade their operation to STP to ensure compatibility. However, this disables RSTP's rapid convergence features, as the protocol behaves like STP to maintain interoperability .


NEW QUESTION # 31
On the campus OSPF network shown in the following figure, the interfaces connecting the five routers are GE interfaces, and their costs are not changed. The import-route command is run on R1. After the network converges, the route to the server at 192.168.1.0/24 is queried on R2. Which of the following is the cost of this route?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: D

Explanation:
Understanding the Network Setup:
* The OSPF network consists of three areas (Area 1, Area 0, and Area 2).
* The server's subnet 192.168.1.0/24 is directly connected to R1 and imported into OSPF using the command:
import-route direct type 1 cost 2
* The type 1 specifies the route as an OSPF Type 1 external route, meaning both the external cost and the internal OSPF cost will be included when calculating the total cost.
* The external cost specified for the imported route is 2.
* Cost Calculation to R2:
* The interfaces between the routers are GE interfaces, and the default cost for GE interfaces is 1.
* The path from R2 to the server goes through the following hops:
* R2 # R1: Cost = 1 (intra-area link).
* R1 # Server: External cost = 2 (specified in the import-route command).
* Total cost to R2:
Intra-area cost (1) + External cost (2) = 3
* Verification of Each Option:
* Option A (2): Incorrect. This only accounts for the external cost, ignoring the internal OSPF cost.
* Option B (4): Incorrect. This overestimates the cost by adding an extra hop.
* Option C (3): Correct. The total cost is 3 (1 for the intra-area link + 2 for the external cost).
* Option D (1): Incorrect. This ignores the external cost of the imported route.
References:
* HCIA-Datacom Study Guide, Chapter: OSPF Route Types and Cost Calculation
* Huawei OSPF Cost Configuration Details


NEW QUESTION # 32
BGP can select routes based on the AS_Path attribute. Therefore, in some cases, a route-policy needs to be used to modify the AS_Path attribute for route selection. Which of the following parameters can be specified in the apply as-path command for a route-policy to modify this attribute?

  • A. Copy
  • B. Overwrite
  • C. Delete
  • D. Additive

Answer: B,C,D

Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
1. Overview of AS_Path Attribute Modification:
The apply as-path command in a route-policy is used to modify the AS_Path attribute of routes. This is often required to influence the selection of routes or to adjust routing policies for incoming or outgoing BGP updates.
2. Parameters of the apply as-path Command:
Option A: Delete
Correct.
The delete parameter removes specific AS numbers from the AS_Path attribute. This is used to simplify or manipulate the AS_Path for specific routing policies.
Option B: Additive
Correct.
The additive parameter appends an AS number to the existing AS_Path attribute, instead of overwriting it.
This is useful when you want to prepend AS numbers to influence route selection without removing the original AS_Path.
Option C: Copy
Incorrect.
The copy parameter is not supported in the apply as-path command for modifying AS_Path attributes.
Option D: Overwrite
Correct.
The overwrite parameter replaces the existing AS_Path with a new one. This provides complete control over the AS_Path attribute but removes the original AS_Path entirely.
3. Summary:
The valid parameters for the apply as-path command are delete, additive, and overwrite.
Huawei HCIA-Datacom Study Guide, Chapter "BGP Route Policies."
BGP Attribute Modification in Huawei Documentation.


NEW QUESTION # 33
The Neighbor Discovery Protocol (NDP) is an important basic protocol in the IPv6 protocol suite and plays an important role. Which of the following functions and features does it support?

  • A. Address resolution
  • B. Neighbor state tracing
  • C. Redirection
  • D. Duplicate address detection

Answer: A,B,C,D

Explanation:
Neighbor Discovery Protocol (NDP):
NDP is a key protocol in the IPv6 protocol suite, replacing ARP (Address Resolution Protocol) in IPv4.
It operates using ICMPv6 (Internet Control Message Protocol for IPv6) and is critical for managing interactions between IPv6 nodes on the same link.
HCIP-Datacom-Core Technology Training Material (NDP Functions and Features).
NDP Features and Functions:
A: Address resolution:NDP resolves IPv6 addresses into MAC addresses, similar to ARP in IPv4. It uses Neighbor Solicitation (NS) and Neighbor Advertisement (NA) messages for this purpose.Reference:HCIP- Datacom-Core Technology Training Material (Address Resolution in IPv6).
B: Neighbor state tracing:NDP tracks the state of neighbors to determine their reachability. It maintains a neighbor cache and uses NS/NA messages to verify whether neighbors are reachable.Reference:HCIP- Datacom-Core Technology Training Material (Neighbor Reachability in IPv6).
C: Duplicate address detection (DAD):NDP ensures that IPv6 addresses are unique within a network. Before assigning an address to an interface, DAD is used to verify that no other node is using the same address. This is done via NS messages.Reference:HCIP-Datacom-Core Technology Training Material (IPv6 Address Assignment and DAD).
D: Redirection:NDP provides redirection functionality to inform hosts of a better first-hop router for reaching a particular destination. It uses ICMPv6 Redirect messages for this purpose.Reference:HCIP-Datacom-Core Technology Training Material (NDP Redirect Functionality).
Conclusion:NDP supports all the mentioned functions and features:Address resolution,Neighbor state tracing, Duplicate address detection, andRedirection, making it indispensable for IPv6 networks.


NEW QUESTION # 34
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