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| Section | Weight | Objectives |
|---|---|---|
| Campus Network Planning and Deployment | 23% | - Campus Network Architecture Design
|
| Network Automation Technologies and Practice | 17% | - Huawei Automation Solutions
|
| Bearer WAN Planning and Deployment | 15% | - Bearer Network Architecture
|
| Advanced Routing and Switching Technologies | 37% | - Advanced Routing Protocols
|
| WAN Interconnection Network Planning and Deployment | 8% | - WAN Service Optimization
|
>> Latest H12-891_V1.0 Dumps Questions <<
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NEW QUESTION # 94
OSPF is a mature protocol and is unlikely to have route computation errors in a regular networking environment under correct configurations. Which of the following statements are correct about the possible causes preventing an OSPF neighbor relationship from entering Full state?
Answer: A,B,C,D
Explanation:
For OSPF neighbors to reach Full state, they must exchange LSAs (Link State Advertisements) properly and synchronize their databases.
Possible Causes Preventing OSPF from Entering Full State:
# A. A link works abnormally
* If the physical or Layer 2 link is unstable, OSPF Hello packets may be lost, preventing the Full state.
# B. The OSPF network types on both ends of the link are inconsistent
* OSPF network types (Broadcast, P2P, NBMA, etc.) must match on both ends.
* Example: If one router is P2P and the other is Broadcast, adjacency issues occur.
# C. The router IDs of neighbors are the same
* Router ID conflicts prevent OSPF adjacencies from forming.
* Each router must have a unique Router ID.
# D. The OSPF MTU values of interfaces on both ends of the link are different
* If MTU settings do not match, OSPF Database Description (DD) packets may be dropped, preventing Full state.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei OSPF Configuration Guide - Troubleshooting OSPF Neighbor Issues
* HCIE-Datacom Study Material - OSPF Adjacency and Route Synchronization
NEW QUESTION # 95
Which of the following can be used to transmit traffic to a VXLAN network and implement intra-subnet communication on the same VXLAN network?
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
AnNVE (Network Virtualization Edge) interfaceis responsible for connecting physical or virtual devices to a VXLAN network. It functions as theVTEP (VXLAN Tunnel Endpoint)and supportsencapsulation and decapsulation of VXLAN packets.
Layer 2 VXLAN gateway (D)is used for intra-subnet communication, but theNVE interfaceis the actual point where traffic enters the VXLAN network.
Layer 3 VXLAN gateway (A)is used for inter-subnet communication.
VLANIF interface (C)is used for VLAN-based communication, not directly for VXLAN.
Therefore, theNVE interface (B)is the correct answer as it serves as thetraffic ingress and egress point for the VXLAN network.
NEW QUESTION # 96
MPLS is located between the data link layer and network layer in the TCP/IP protocol stack and can provide services for all network layer protocols.
Answer: B
Explanation:
MPLS Positioning in the TCP/IP Model
MPLS (Multiprotocol Label Switching) operates between the Data Link Layer (Layer 2) and the Network Layer (Layer 3).
# MPLS is protocol-independent and supports various network layer protocols (IPv4, IPv6, VPN, etc.) by using labels instead of traditional IP routing.
# How MPLS Works:
* MPLS assigns labels to packets, allowing fast forwarding based on the label rather than a routing table lookup.
* Supports Layer 3 VPNs (L3VPNs), Layer 2 VPNs (L2VPNs), and MPLS Traffic Engineering (MPLS-TE).
# Why MPLS is Between Layer 2 and Layer 3?
* MPLS adds a label between the Layer 2 (Ethernet, PPP) and Layer 3 (IP) headers, effectively creating a separate forwarding mechanism.
* Label Switching Routers (LSRs) forward packets based on labels instead of IP addresses, reducing processing time.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei MPLS Technology Guide - MPLS Architecture and Label Switching
* HCIE-Datacom Study Material - MPLS Positioning and Functionality in TCP/IP
NEW QUESTION # 97
An SRLB is a set of user-specified local labels reserved for SR-MPLS. These labels are locally configured and have only local significance. Therefore, they are not advertised through the IGP.
Answer: B
Explanation:
Understanding SRLB (Segment Routing Local Block)
๐น What is SRLB?
SRLB (Segment Routing Local Block) is a range of local MPLS labels used by Segment Routing (SR-MPLS).
These labels are only relevant to the local router and are not advertised to other routers.
๐น Key SR-MPLS Label Blocks:
โ
SRGB (Segment Routing Global Block) - Globally significant labels shared among routers.
โ
SRLB (Segment Routing Local Block) - Locally significant labels, not shared.
Why is the Answer TRUE?
โ
SRLB labels are only locally defined and are NOT distributed via IGP (OSPF or IS-IS).
โ
They are used for local forwarding decisions within an SR-enabled router.
โ
Only SRGB labels are advertised to ensure consistent global label assignment.
Real-World Application:
Traffic Engineering (TE): Uses SRLB for custom local path optimizations.
Segment Routing Networks: Ensures scalable MPLS forwarding without requiring full LDP signaling.
โ
Reference: Huawei HCIE-Datacom Guide - Segment Routing Label Blocks (SRGB & SRLB)
NEW QUESTION # 98
For a non-directly connected EBGP neighbor to establish properly, what configurations must be included as follows?
Answer: B,D
NEW QUESTION # 99
......
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