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100% Pass Quiz 2025 Huawei Authoritative H12-821_V1.0: HCIP-Datacom-Core Technology V1.0 Dumps Free

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Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions (Q255-Q260):

NEW QUESTION # 255
A router forwards traffic based on a FIB table. Which of the following values of the Flag field in a routing entry indicates that the next hop of the route is the gateway?

A. S
B. H
C. G
D. D

Answer: C

Explanation:
Comprehensive and Detailed In-Depth Explanation:
* The Flag field in a routing table entry provides specific information about the route.
* G (Gateway flag): This flag indicates that the next hop is a gateway (another router) rather than a directly connected destination.
* S (Static flag): This flag indicates that the route was manually configured as a static route.
* H (Host flag): This flag means that the destination is a directly connected host, not a network.
* D (Dynamic flag): This flag is used for dynamically learned routes from protocols like OSPF, EIGRP, or BGP.
* Since we are looking for the flag that indicates the next hop is a gateway, the correct answer is G.
# Reference: Huawei HCIA-Datacom Study Guide, Chapter on Routing Table and FIB Entries.

NEW QUESTION # 256
OSPF has five types of packets, which have the same header format. If the Auth Type field in the packet header is 1, which of the following authentication modes is used?

A. Plaintext authentication
B. Hash authentication
C. MD5 authentication
D. Non-authentication

Answer: A

Explanation:
OSPF Authentication Overview
* The Auth Type field in the OSPF packet header determines the authentication mode. If the Auth Type is
1, plaintext authentication is used.
* Plaintext authentication involves transmitting the password in an easily readable format, which is less secure compared to MD5.
HCIP-Datacom-Core Reference
* Authentication mechanisms, including plaintext authentication, are detailed in the OSPF security configuration chapter, confirming that Auth Type = 1 corresponds to plaintext.

NEW QUESTION # 257
Which of the following attacks is not the network layer attack?

A. Smurf attack
B. ICMP attack
C. ARP spoofing attack
D. IP spoofing attack

Answer: C

Explanation:
ARP spoofing is a Layer 2 attack, as it targets ARP tables in switches or end devices. All other attacks, including IP spoofing, ICMP attacks, and Smurf attacks, are network layer (Layer 3) attacks .

NEW QUESTION # 258
On an OSPF network, an algorithm is used to prevent loops within an area, but loops may occur between areas. Therefore, OSPF defines a loop prevention mechanism for inter-area routes. Which of the following statements are true about the loop prevention mechanism?

A. An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to the same area.
B. Inter-area routes cannot be directly transmitted between non-backbone areas.
C. Inter-area routes need to be forwarded through area 0.
D. All non-backbone areas must be directly connected to area 0.

Answer: A,B,C,D

Explanation:
OSPF Area Design and Loop Prevention:OSPF uses a hierarchical structure with areas to improve scalability and efficiency. Area 0, the backbone area, plays a crucial role in ensuring loop-free route distribution between areas. The following mechanisms are key to preventing routing loops:
* Strict adherence to hierarchical area design.
* Prohibition of direct inter-area route exchanges between non-backbone areas.

NEW QUESTION # 259
On the OSPF network shown in the figure, an adjacency has been established between R1 and R2. An engineer configures the commands in the figure on R2. In this case, which of the following routing entries may exist in the routing table of R2?

A. 10.1.1.0/24
B. 10.1.3.0/24
C. 10.1.4.0/24
D. 10.1.2.0/24

Answer: B,C,D

Explanation:
Configuration Analysis:
* On R2, the following configuration has been applied:
acl 200
rule deny source 10.1.0.0 0.0.3.0
rule permit
#
ospf 1
filter-policy 2000 import
* This configuration uses ACL 200 to filter routes during import into the OSPF routing table on R2.
* Rule deny source 10.1.0.0 0.0.3.0: Blocks routes in the range 10.1.0.0/24 to 10.1.3.0/24 (inclusive).
* Rule permit: Allows all other routes to be imported.
* Impact of ACL 200 on Route Import:
* 10.1.0.0/24 to 10.1.3.0/24: These subnets are explicitly denied by ACL 200 and will not appear in R2's routing table.
* 10.1.4.0/24 and beyond: These subnets are permitted by the rule permit statement and will be imported into R2's routing table.
* Routing Table Entries on R2:
* Option A (10.1.4.0/24): Exists in R2's routing table because it is permitted.
* Option B (10.1.3.0/24): Does not exist because it is denied by ACL 200.
* Option C (10.1.2.0/24): Does not exist because it is denied by ACL 200.
* Option D (10.1.1.0/24): Does not exist because it is denied by ACL 200.
* A (10.1.4.0/24)
Correct Options:References:
* HCIA-Datacom Study Guide, Chapter: OSPF Route Filtering
* Huawei ACL Configuration for Route Policies

NEW QUESTION # 260
......

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