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Huawei H12-891_V1.0 (HCIE-Datacom V1.0) Certification Exam is a globally recognized certification program that is designed to validate the skills and expertise of professionals in the field of Datacom. HCIE-Datacom V1.0 certification exam is conducted by Huawei, one of the leading providers of ICT solutions and services in the world. The HCIE-Datacom V1.0 Certification Exam is the highest level of certification in the Huawei Datacom certification track.
Huawei H12-891_V1.0 (HCIE-Datacom V1.0) Certification Exam is a challenging and comprehensive exam that tests the skills and knowledge of individuals in the field of data communication. Candidates who pass H12-891_V1.0 exam are recognized as being among the top professionals in the field and are highly sought after by employers. To prepare for the exam, candidates should take training courses, practice exams, and gain hands-on experience working with data communication technologies.
Huawei H12-891_V1.0 (HCIE-Datacom V1.0) certification exam is designed to test the candidate's knowledge and skills in the field of data communication. H12-891_V1.0 exam validates the candidate's expertise in designing, implementing and troubleshooting complex data communication networks. The HCIE-Datacom V1.0 certification is intended for professionals who are seeking to enhance their career in the field of data communication.
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NEW QUESTION # 36
Exhibit:
A loop occurs because Spanning Tree Protocol (STP) is not enabled on the network. Which of the following symptoms may occur?
Answer: A,C,D
Explanation:
When Spanning Tree Protocol (STP) is not enabled on a network, loops can occur in Layer 2 Ethernet networks, leading to various network issues. STP is designed to prevent loops by blocking redundant paths, and its absence can cause broadcast storms, MAC address table instability, and resource exhaustion. Let's analyze each option in the context of Huawei HCIE Datacom documentation and network behavior:
A: A loop alarm is generated on the LAN switch.
This option is incorrect. Huawei switches, as per HCIE Datacom standards, do not automatically generate a specific "loop alarm" unless configured with loop detection features (e.g., Huawei's Loop Detection Protocol or similar mechanisms). Without STP or loop detection enabled, the switch may not explicitly generate an alarm for a loop; instead, it will exhibit symptoms like broadcast storms or flapping MAC entries. Therefore, this is not a direct symptom of an STP-less loop. Reference: Huawei HCIE Datacom V3.0 Training Materials, Section 4.2 - Spanning Tree Protocol and Loop Prevention.
B: CPU usage is too high.
This option is correct. When a loop occurs without STP, broadcast packets (and sometimes multicast or unknown unicast packets) circulate endlessly in the network. This leads to excessive processing by switches as they handle these packets, resulting in high CPU usage. Huawei switches, as described in HCIE Datacom documentation, can experience CPU overload due to continuous packet forwarding and processing in a looped environment. Reference: Huawei HCIE Datacom V3.0, Chapter 5 - Switch Performance and Loop Management.
C: MAC entries flap.
This option is correct. In a loop without STP, switches continuously receive frames from multiple ports, causing MAC address tables to update repeatedly as the same MAC address appears on different ports. This
"flapping" of MAC entries destabilizes the network and can lead to incorrect frame forwarding. Huawei HCIE Datacom emphasizes MAC address table stability as a critical aspect affected by loops, as outlined in Section
4.3 - Ethernet Switching and Loop Mitigation. Reference: Huawei HCIE Datacom V3.0, Section 4.3.
D: Host receives a large number of broadcast packets.
This option is correct. A loop without STP causes broadcast packets to circulate indefinitely, creating a broadcast storm. Hosts connected to the network will receive an overwhelming number of these packets, potentially leading to performance degradation or even network timeouts. This is a well-documented symptom in Huawei HCIE Datacom training, specifically in discussions about loop prevention mechanisms.
Reference: Huawei HCIE Datacom V3.0, Chapter 4 - Layer 2 Loop Prevention.
Thus, the correct symptoms of a loop occurring due to the absence of STP include high CPU usage, flapping MAC entries, and hosts receiving a large number of broadcast packets. Option A is incorrect as it requires specific loop detection configuration, which is not implied in the question.
NEW QUESTION # 37
What is the router ID length supported by OSPFv3?
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
OSPFv3, which supports IPv6, uses a router ID that is 32 bits in length, similar to OSPFv2. The router ID in OSPF is always a 32-bit number, typically represented in an IPv4 address format (dotted decimal). Although OSPFv3 is designed to support IPv6, itstill relies on a 32-bit router ID for identification, which must be unique within an OSPF domain. The router ID does not change even though the protocol itself supports IPv6 addresses (128 bits).
NEW QUESTION # 38
In cross-domain VPN-OptionB packet forwarding, two ASBRs exchange the same LSP tags once.
Answer: B
NEW QUESTION # 39
The following statement about is the ISIS protocol LSP message is correct
Answer: A,B,C,D
NEW QUESTION # 40
In a scenario where a VXLAN tunnel is dynamically established through BGP EVPN, which of the following command needs to be run on the VBDIF interface to enable the VTEP peer to generate BGP EVPN Type 2 routes based on ARP information of the local terminal?
Answer: D
Explanation:
BGP EVPN Type 2 Route (MAC/IP Advertisement Route)
This route carriesMAC and IP address bindingsto inform remote VTEPs about locally learned endpoints.
Why Use arp collect host enable?
Collects ARP entriesof locally connected hosts.
EnablesBGP EVPN Type 2 route generationto distribute the learned ARP information.
Incorrect Answer Explanations:#A. mac-address xxxx-xxxx-xxxx- Manually configures a MAC address butdoes not enable ARP collection for EVPN Type 2 routes.#B. arp-proxy enable- Enables ARP Proxy butdoes not advertise ARP information using BGP EVPN.#D. arp distribute-gateway enable- Used inDistributed Anycast Gateway (DAG) modebutnot for collecting host ARP data.
Reference from Huawei HCIE-Datacom Documentation:
Huawei VXLAN EVPN Configuration Guide - ARP Handling and EVPN Type 2 Routes HCIE-Datacom Training Material - VTEP ARP Advertisement in VXLAN Networks
NEW QUESTION # 41
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