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Huawei H12-821_V1.0 Exam Questions
- Huawei Certified ICT Professional HCIP Certifications
- Huawei HCIP Datacom Certifications
- Topic 1: Data Communication Fundamentals: This section addresses fundamental ideas in data communication for network engineers, such as network models, data transfer, and network topologies.
- Topic 2: Routing Protocols: This section, intended primarily for network engineers, covers the various routing protocols and covers how to set them up and resolve issues. This category includes both internal gateway protocols (IGPs) like OSPF and RIP and external gateway protocols (EGPs) like BGP.
- Topic 3: Switching Technologies: Aimed at network engineers, this section covers switching principles, VLANs, and STP.
- Topic 4: Network Security: For network engineers, this section covers the fundamentals of network security, including firewalls, virtual private networks, and access control lists (ACLs).
- Topic 5: Network Troubleshooting: Network engineers should refer to this section, which covers frequent network problems, troubleshooting techniques, and optimizing network performance.
Free Huawei H12-821_V1.0 Exam Actual Questions
Note: Premium Questions for H12-821_V1.0 were last updated On Apr. 19, 2025 (see below)
BGP is generally applied to complex networks where routes change frequently. Frequent route flapping consumes a large number of bandwidth and CPU resources, and even affects the normal operation of the network. This is an unavoidable problem that cannot be solved in BGP.
BGP Route Flapping and Mitigation
While route flapping is a concern in large-scale networks, BGP employs mechanisms such as Route Dampening to mitigate its impact. Route dampening suppresses frequently flapping routes for a period of time to reduce resource consumption and network instability.
Therefore, it is incorrect to state that the issue cannot be resolved in BGP.
HCIP-Datacom-Core Reference
The mechanism of route dampening is detailed in the BGP optimization chapters.
BFD provides fast fault detection independent of media and routing protocols. To use this mechanism to detect link connectivity, devices at both ends must support this feature.
Comprehensive and Detailed Step-by-Step
Bidirectional Forwarding Detection (BFD):
BFD is a lightweight protocol that provides rapid fault detection on links independent of the underlying routing protocol or media.
Requirements for BFD:
Both devices at the endpoints of the link must support and configure BFD for it to operate.
If one device does not support BFD, the feature cannot be used for link detection.
HCIA-Datacom Study Guide, Chapter: BFD Overview
Huawei BFD Configuration Guidelines
On an enterprise WLAN where Portal authentication is deployed, an AC functions as an access device and communicates with a Portal server using the Portal protocol. Which of the following statements are true about the Portal protocol?
Comprehensive and Detailed Step-by-Step
Portal Authentication:
Portal authentication uses a web-based mechanism where clients are redirected to a login page.
Communication between the access device and Portal server uses HTTP or HTTPS protocols.
Correct Statements:
Option A: HTTP or HTTPS is used for Portal authentication.
Option D: Portal protocol packets are transmitted over TCP for reliable communication.
Incorrect Statements:
Option B: Port 2000 is not the default for processing Portal packets.
Option C: The default destination port for communication with the Portal server is not 50100.
HCIA-Datacom Study Guide, Chapter: WLAN Portal Authentication
Huawei WLAN Authentication Protocols
When a packet passes through a firewall, the firewall creates a session connection for the packet to guide subsequent forwarding of the packet. However, the firewall does not create session entries for all packets. For which of the following packets does the firewall not create session entries when the packet reaches the firewall?
Comprehensive and Detailed Step-by-Step
Session Creation in Firewalls:
Firewalls create session entries for packets requiring stateful inspection (e.g., TCP, UDP, ICMP, and GRE).
Subsequent fragments of large packets do not require new sessions. Instead, they are processed based on the session created for the first fragment.
Correct Option:
C (Subsequent Fragment): Does not trigger a new session entry as it belongs to an existing session.
HCIA-Datacom Study Guide, Chapter: Firewall Session Handling
Huawei Fragmentation Processing in Firewalls
On the OSPF network shown in the figure, R1, R2, and R3 run OSPF, and R1 advertises four VPN routes to OSPF. A filter-policy needs to achieve the following goal: R1's and R3's routing tables contain the routes to 192.168.3.0/24, but R2's routing table does not. Which of the following filter-policies cannot meet this requirement?
Goal Analysis:
Requirement:
The route to 192.168.3.0/24 must exist in R1's and R3's routing tables.
The route must not exist in R2's routing table.
This requires filtering to ensure the route is either:
Blocked on R2's routing table (via filtering on R2), or
Blocked before it is advertised to R2.
Analysis of Each Option:
Option A (Filter-policy on R2 for filtering received routes):
Applying a filter-policy on R2 to filter received routes will block the route from entering R2's routing table but still allow it to propagate to R3.
This meets the requirement.
Option B (Filter-policy on R2 for filtering the routes to be advertised):
Blocking the advertisement of routes from R2 to other routers does not affect the routes received by R2 itself.
This does not meet the requirement but does not affect the propagation to R3.
This is valid if the received route is blocked.
Option C (Filter-policy on R1 for filtering the routes to be imported):
If the route is filtered on R1 during the import phase, the route will not exist in R1's routing table and thus cannot be advertised to either R2 or R3.
This fails to meet the requirement because the route must exist in R1's and R3's routing tables.
Option D (Filter-policy on R1 for filtering the imported routes to be advertised):
Filtering routes on R1 before advertising to R2 will prevent R2 from receiving the route but allow R1 to advertise the route to R3.
This meets the requirement.
Correct Option:
C (Filter-policy on R1 for filtering the routes to be imported): This will prevent the route from existing in both R1 and R3, violating the stated requirement.
HCIA-Datacom Study Guide, Chapter: OSPF Route Filtering
Huawei OSPF Configuration and Filtering Methods
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