[Full-Version] 2025 New Preparation Guide of Huawei H12-821_V1.0 Exam
H12-821_V1.0 Practice Exam - 220 Unique Questions
NEW QUESTION # 74
Which of the following statements regarding the display bgp routing-table command output is true?
- A. The route to the destination address 192.168.1.0 is not the optimal route in the BGP routing table.
- B. The MED value of the route to the destination address 192.168.1.0 is 100.
- C. The route to the destination address 192.168.1.0 is injected into the BGP routing table using the network command.
- D. The route to the destination address 192.168.1.0 is learned through AS 200.
Answer: C
Explanation:
The Origin attribute in the display bgp routing-table output is marked as i, indicating that the route was injected into the BGP routing table using the network command. The other options are incorrect because the AS path is not displayed, the MED is 0, and the route is marked as the best (>), meaning it is the optimal route
.
NEW QUESTION # 75
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. Neighbor state tracing
- B. Address resolution
- 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.
NEW QUESTION # 76
The Interface \P address and VRRP virtual IP address can be the same.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION # 77
Match the following IPv4 multicast protocols with the corresponding functions.
Answer:
Explanation:
Explanation:
IGMP: Manages IPv4 multicast group members and runs on the multicast network's last segment (that is, the network segment where a Layer 3 network device is connected to user hosts).
PIM: Sends multicast data over the network to the multicast device that is connected to group members that have requested the multicast data, implementing multicast data forwarding based on routes.
IGMP Snooping: Manages and controls the forwarding of multicast data packets to effectively suppress the flooding of multicast data packets on the Layer 2 network.
IGMP (Internet Group Management Protocol):
* IGMP is used by hosts and adjacent multicast routers to establish and maintain multicast group memberships on a local subnet.
* It allows a host to inform a multicast router of its desire to receive multicast traffic for a specific group.
* It operates at Layer 3 and runs on the last segment of the network.
NEW QUESTION # 78
A local router runs IS-IS and its command output is shown in the following figure. Which of the following statements is true?
- A. The circuit level of S4/0/0 is Level-1.
- B. S4/0/0 supports IPv6.
- C. The cost of S4/0/0 is 20.
- D. S4/0/0 sends IIH packets at the interval of 30s.
Answer: D
NEW QUESTION # 79
Which of the following statements is true about BGP?
- A. Open messages carry only the BGP header.
- B. If the export routing policy applied to a BGP peer changes, manual intervention is required so that the device resends Update messages to the peer.
- C. A router cannot be configured with multiple BGP processes.
- D. IGP routes can be converted into BGP routes only through the network command.
Answer: B
Explanation:
Export Routing Policy Changes
* When an export routing policy is modified, BGP does not automatically resend affected routes. Manual intervention, such as a clear ip bgp command, is required to resend Update messages reflecting the new policy.
Incorrect Options
* B. IGP routes can also be advertised into BGP using redistribution, not just the network command.
* C. A router can be configured with multiple BGP processes using different AS numbers (multi-instance BGP).
* D. Open messages carry additional parameters such as AS number, Hold Time, and Router ID, not just the header.
HCIP-Datacom-Core Reference
* BGP policy and update behavior are detailed in the route control and redistribution chapters.
NEW QUESTION # 80
Which command is used to configure the VRRP preemption delay?
- A. vrrp vrid 1 timer delay 20
- B. vrrp vrid 1 preempt-timer 20
- C. vrrp vrid 1 preempt-mode timer delay 20
- D. vrrp vrid 1 preempt-delay 20
Answer: D
Explanation:
The correct command for configuring the VRRP (Virtual Router Redundancy Protocol) preemption delay is vrrp vrid 1 preempt-delay 20. This command sets the delay before a higher-priority VRRP router preempts the master role, ensuring stable operation during network transitions .
NEW QUESTION # 81
The VRID of the VRRP virtual router is 3 and the virtual IP address is 100.1.1.10. What is the virtual MAC address?
- A. 00-00-5E-00-01-64
- B. 01-00-5E-00-01-03
- C. 00-00-5E-00-01-03
- D. 01-00-5E-00-01-64
Answer: C
Explanation:
The virtual MAC address for a VRRP virtual router is determined by the formula 00-00-5E-00-01-[VRID in hexadecimal]. For VRID 3, the hexadecimal equivalent is 03. Thus, the virtual MAC address is 00-00-5E-00-
01-03 .
NEW QUESTION # 82
Which of the following statements regarding an IP prefix are true?
- A. An IP prefix filter can be used to filter data packets.
- B. An IP prefix filter is used to filter IP address prefixes and cannot match an IP prefix number and a prefix length at the same time.
- C. An IP prefix filter is used to filter IP address prefixes and can match an IP prefix number and a prefix length at the same time.
- D. An IP prefix filter cannot be used to filter data packets.
Answer: C
Explanation:
An IP prefix filter is designed to match both the IP address and its prefix length, making it suitable for filtering routing information rather than data packets. Options A and D are incorrect because IP prefix filters do not work directly on data packets, and they can match both prefix numbers and lengths .
NEW QUESTION # 83
On an RSTP network, if a port receives an RST BPDU and finds that its buffered RST BPDU is superior to the received RST BPDU, the port discards the received RST BPDU without responding.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
RST BPDU Handling
* On an RSTP network, if a port receives an RST BPDU and determines its own buffered BPDU is superior, it discards the received BPDU without responding. This ensures stability and proper convergence in the network.
HCIP-Datacom-Core Reference
* BPDU handling is described in the RSTP operation chapters.
NEW QUESTION # 84
Which of the following statements regarding the firewall zone security level is false?
- A. The configured security level cannot be changed.
- B. Only the security level of the user-defined zone can be configured.
- C. Two zones cannot be configured with the same security level.
- D. The default security level of the new zone is 1.
Answer: A
NEW QUESTION # 85
A switch runs MSTP. The configuration is shown in the figure. What is the role of this switch in MSTI 1?
- A. Non-root switch
- B. Uncertain
- C. Secondary root switch
- D. Root switch
Answer: B
Explanation:
Based on the MSTP configuration shown, the role of the switch in MSTI 1 cannot be determined without additional details about the topology or priority values of other switches in the instance. The role could be a root switch, secondary root, or non-root, depending on these factors .
NEW QUESTION # 86
There are various types of VPNs, which can be applied to different layers. Which of the following network layers does SSL VPN belong to?
- A. Application layer
- B. Data link layer
- C. Transport layer
- D. Network layer
Answer: A
Explanation:
SSL VPN and Its Functionality:
* SSL VPN (Secure Sockets Layer Virtual Private Network) provides secure remote access to a network using SSL/TLS protocols.
* SSL VPN operates at the Application Layer of the OSI model. It enables secure communication for applications like web browsers, email clients, and file sharing.
* Unlike IPsec VPN, which operates at the Network Layer, SSL VPN focuses on application-specific encryption and authentication.
NEW QUESTION # 87
Access control lists can be classified into which types as follows?
- A. User-defined ACL
- B. Basic ACL
- C. Advanced ACL
- D. Layer 2 ACL
Answer: B,C,D
Explanation:
Access Control Lists (ACLs) can be classified into several types, including Basic ACL (filters based on source IP), Advanced ACL (filters based on multiple parameters like source and destination IP, protocol, and ports), and Layer 2 ACL (filters based on MAC addresses). User-defined ACLs are not a standard classification .
NEW QUESTION # 88
Which of the following statements regarding different LSA types is false?
- A. LS Request packets contain only LS Type, LS ID, and Advertising Router.
- B. LS Update packets contain complete LSA information.
- C. LS Ack packets contain complete LSA information.
- D. DD packets contain only LSA summary information, including LS Type, LS ID, Advertising Router, and LS Sequence Number.
Answer: C
Explanation:
LS Ack (Link State Acknowledgment) packets are used to acknowledge received LSAs and do not contain complete LSA information. Instead, they contain only the headers of LSAs being acknowledged. This contrasts with LS Update packets, which carry full LSA details. The misunderstanding of LS Ack functionality makes this statement false .
NEW QUESTION # 89
A monitoring plane usually comprises the monitoring units of main control boards and interface boards. This plane can monitor the system environment independently. Which of the following environment monitoring functions can be provided by the monitoring plane?
- A. Voltage monitoring
- B. Fan control
- C. System power-on and power-off control
- D. Temperature monitoring
Answer: A,B,C,D
Explanation:
The monitoring plane's primary role is environmental monitoring, ensuring the stability of the system.
Functions like voltage monitoring, temperature tracking, fan speed control, and power management are standard. These are independent of the forwarding or control planes and critical for maintaining device health in network operations .
NEW QUESTION # 90
An enterprise administrator views the following details about a BGP route during routine O&M:
yaml
CopyEdit
<HUAWEI> display bgp routing-table 192.168.1.1
BGP local router ID: 10.1.1.1
Local AS number: 100
Paths: 2 available, 0 best, 0 select
BGP routing table entry information of 192.168.1.1/32:
From: 10.1.1.2 (10.1.1.2)
Route Duration: 00h01m31s
Relay IP Nexthop: 0.0.0.0
Relay IP Out-Interface: --
Original nexthop: 172.16.1.2
AS-path: 200, origin incomplete, MED 0, localpref 100, pref-val 0, internal, pre 255, invalid for IP unreachable Not advertised to any peer yet Which of the following statements are true about the BGP route?
- A. The local BGP router ID is 10.1.1.1.
- B. The original next hop of the route is 172.16.1.2.
- C. The route is preferentially selected because its Local_Pref has a higher priority.
- D. The local AS number is 100.
Answer: A,B,D
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
* Analysis of BGP Attributes:
* Original Next Hop: The output shows that the original next hop of the route is 172.16.1.2. (A is correct).
* Local Router ID: The local BGP router ID is 10.1.1.1, as displayed. (B is correct).
* Local AS Number: The local AS number is 100, as displayed. (C is correct).
* Incorrect Option:
* Local_Pref: Although Local_Pref is an important attribute, this route is marked as invalid due to
"IP unreachable" and thus cannot be preferentially selected.
References:
* HCIA-Datacom Study Guide, Chapter: BGP Routing Attributes
* Huawei BGP Routing Table Analysis
NEW QUESTION # 91
Depending on the type of algorithms used, routing protocols are classified into distance-vector protocols and link-state protocols. Which of the following routing protocols are link-state protocols?
- A. OSPF
- B. IS-IS
- C. BGP
- D. RIP
Answer: A,B
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
* Distance-Vector Protocols:
* Distance-vector protocols determine the best path based on the distance to a destination and periodically share the entire routing table with neighbors.
* Example: RIP is a distance-vector protocol.
* Link-State Protocols:
* Link-state protocols share information about directly connected links, enabling routers to build a complete map of the network.
* OSPF (Open Shortest Path First) and IS-IS (Intermediate System to Intermediate System) are link-state protocols that use Dijkstra's algorithm to calculate the shortest path.
* Border Gateway Protocol (BGP):
* BGP is neither a distance-vector nor a link-state protocol. Instead, it is classified as a path-vector protocol that selects the best path based on attributes such as AS-path, next-hop, and local preference.
References:
* HCIA-Datacom Study Guide, Chapter: Routing Protocol Basics
Huawei Networking Fundamentals, Section: Classification of Routing Protocols
NEW QUESTION # 92
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Passing the H12-821_V1.0 certification exam demonstrates that a candidate has the necessary expertise to plan, design, and deploy core network technologies using Huawei products and solutions. It also provides an opportunity for professionals to enhance their career prospects and increase their earning potential.
Huawei H12-821_V1.0 exam consists of 60 multiple-choice questions, and candidates have 90 minutes to complete the test. H12-821_V1.0 exam is available in both English and Chinese and can be taken online or in-person at a designated testing center. Upon passing the exam, candidates will receive the HCIP-Datacom-Core Technology V1.0 certification, which is recognized by many leading IT organizations and companies around the world.
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