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| Section | Weight | Objectives |
|---|---|---|
| Network Operation and Maintenance | 5% | - Monitoring and Troubleshooting
|
| Carrier IP Network Architecture | 10% | - Carrier Network Evolution
|
| IGP Advanced Technologies | 15% | - OSPF and IS-IS Advanced Features
|
| Network Service Technologies | 10% | - Carrier Services
|
| MPLS and Segment Routing | 20% | - Carrier Transport Technologies
|
| BGP Advanced Technologies | 20% | - Carrier-Grade BGP
|
| Network Reliability and Protection | 7% | - High Availability Design
|
| Network Automation and SDN | 5% | - Automation Technologies
|
| IPv6 Technologies | 8% | - IPv6 Deployment
|
>> Valid Dumps H35-831 Questions <<
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NEW QUESTION # 56
When synchronizing LSDBs over a P2P network, IS-IS does not need to send CSNPs.
Answer: A
Explanation:
Huawei Reference Verification:
Huawei's IS-IS implementation distinguishes the CSNP behavior on broadcast and point-to-point links. A DIS periodically sends CSNP summaries on broadcast networks, but P2P adjacencies still exchange CSNPs during initial database synchronization. After comparing the received complete list of LSP headers with its own LSDB, a router can use PSNPs to request missing information or acknowledge LSPs. The absence of periodic DIS-based CSNP flooding on P2P links does not mean that CSNPs are never exchanged. Hence the assertion that P2P synchronization does not need CSNPs is false.
Technical Deep Dive:
B is FALSE. IS-IS uses Hellos to establish adjacency, LSPs to disseminate link-state information, and SNPs to compare or request database information. A CSNP provides a complete summary of known LSPs; PSNPs carry partial summaries, requests or acknowledgments depending on link context. On a P2P link, the two routers exchange CSNPs when the adjacency is initially established so they can identify differing LSP content. Missing or stale LSPs are requested or refreshed through the appropriate PSNP and LSP exchange.
P2P links do not elect a DIS and thus lack the periodic DIS behavior seen on multiaccess LANs. But the absence of a DIS is not proof that CSNP is unnecessary at adjacency setup. This is an important exam-key correction: the intended statement is false under Huawei's documented P2P LSDB synchronization procedure.
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NEW QUESTION # 57
In an EVPN L3VPNv4-over-SRv6 BE scenario, must P routers in a carrier network also support SRv6?
Answer: A
Explanation:
Huawei Reference Verification:
Huawei SRv6 Best Effort transports VPN services over native IPv6 reachability. An ingress PE can encapsulate the customer IPv4 packet using an outer IPv6 header whose destination identifies the remote egress service SID. Transit P routers forward the outer IPv6 packet by ordinary longest-prefix-match lookup toward the locator, without having to execute the service SID's endpoint behavior. The egress PE interprets its local SID and forwards the decapsulated customer traffic through the correct VPN instance. Therefore SRv6- capable PE endpoints are required but native SRv6 support on every P router is not mandatory.
Technical Deep Dive:
B is FALSE. An MPLS VPN transport typically requires P routers capable of swapping MPLS transport labels. SRv6 BE differs because ordinary IPv6 forwarding can carry the encapsulated service packet across the network. The ingress PE performs a customer VPN lookup, adds the outer IPv6 destination containing the egress service SID, and forwards into the IPv6 underlay. Each P router forwards according to its IPv6 FIB and need not understand End.DT4 or another egress service behavior. The egress PE receives the packet destined to its local SID, removes the appropriate transport encapsulation and performs the service VPN lookup. SRv6 support on transit routers remains useful for SRv6 TE, TI-LFA or other specialized transit behaviors but is not an inherent BE transport requirement. Underlay IPv6 reachability to the egress locator remains essential.
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NEW QUESTION # 58
Which backup modes do vBRAS-UPs support?
Select all that apply.
Answer: A,D
Explanation:
Huawei Reference Verification:
Huawei's separated subscriber-control and user-plane architecture allows several active UPs to share standby protection resources. A carrier deployment model describes N+1 warm protection, and independent Huawei vBNG interoperability testing establishes N:1 warm backup with one standby UP protecting multiple active nodes. When an active forwarding node fails, the control plane coordinates recovery and installs the subscriber
/session and routing information required by the standby. Warm backup differs from 1:1 hot standby, in which much of the active forwarding state may be continuously replicated. The answer therefore selects the two warm-backup configurations.
Technical Deep Dive:
A and D are the intended answers. In N+1 protection, backup capacity exists in addition to the group of active resources. In N:1 warm backup a single standby protects N active user planes. The centralized vBRAS-CP monitors UP resources, coordinates selection of the recovery node and redeploys the affected subscriber information after a failure. This model optimizes spare hardware compared with dedicating a synchronized standby UP to each active UP. It may produce longer restoration times than 1:1 hot standby because forwarding entries are restored or reinstalled during failover rather than continuously synchronized.
Restoration depends on subscriber population, policy/session complexity, UP processing speed, and forwarding-table installation rate. N+1 hot and N:1 cold backup do not match the intended vBRAS-UP protection models. Support for the exact N+1 nomenclature and deployment limits must be checked against the relevant Huawei product release.
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NEW QUESTION # 59
Which of the following statements is incorrect regarding SRv6 protection technologies?
Answer: A
Explanation:
Huawei Reference Verification:
Huawei SRv6 TE Policies contain candidate paths and segment lists whose validity depends on reachability of their mandatory SIDs. Headend fault detection can mark a segment list Down when an essential SID becomes unreachable or disappears from the relevant topology. There is no general rule that more than two SIDs must fail before a segment list is invalidated. Protection may use another valid segment list, candidate path, or VPN- level alternate route. The threshold claim in C is therefore incorrect. The other options describe intended TI- LFA and service-PE protection functions with the deployment constraints applicable to explicit SRv6 paths.
Technical Deep Dive:
C is incorrect because a mandatory SID disappearing from the topology can invalidate a segment list regardless of whether other SIDs remain reachable. SRv6 TE Policy selects candidate paths containing ordered segment lists; the headend must ensure the required path instructions remain viable. It may switch to another candidate or segment list when one becomes invalid. TI-LFA supplies precomputed local protection for eligible link or node failures but cannot always bypass a failed explicitly required segment while still honoring the specified TE path. SRv6 BE and SRv6 TE Policy may both use local protection subject to endpoint and path constraints. In an L3VPN, VPN FRR or egress protection can also protect service reachability against PE failure. The key distinction is local repair versus headend path validity. The specific deletion and invalidation behavior should follow the product release's headend fault-detection implementation rather than an arbitrary count of missing SIDs.
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NEW QUESTION # 60
Which of the following key factors must be considered when designing an IGW for an IP core network?
Select all that apply.
Answer: A,B,C,D
Explanation:
Huawei Reference Verification:
Huawei's carrier IP gateway design requires sufficient policy-processing scale, forwarding resources, routing- information transport capacity, and security controls. An Internet Gateway can receive large external BGP route sets, process prefix and community policies, and advertise selected reachable destinations into other parts of the backbone. Its interface bandwidth, routing-table resources, CPU and memory, and forwarding ASIC capacity must match expected demand. As a boundary between autonomous networks, it also requires routing filtering and defenses against harmful or unauthorized traffic. These are complementary responsibilities: a high packet throughput specification does not compensate for poor BGP scalability or insufficient security. All four proposed factors must be considered.
Technical Deep Dive:
A, B, C, and D are correct. Routing-policy scale covers BGP prefixes, filters, route preference, community and AS-path attributes, and traffic-engineering decisions. Hardware capacity includes interface rates, route and ACL table sizes, packet processing, control CPU, memory, and line-card traffic-management capability.
Route transport capability covers BGP session scale, route propagation, policy operations, and convergence under network changes. Security requires route filtering, ingress antispoofing, management-plane access control, control-plane policing, and appropriate DDoS mitigation. On Huawei NetEngine platforms, NP/ASIC forwarding hardware performs FIB lookups, ACL matching, classification, and QoS handling, whereas the control-plane subsystem maintains BGP route state. Designers must size these subsystems independently.
`display bgp peer`, `display bgp routing-table`, `display cpu-usage`, `display memory-usage`, and routing statistics can provide operational evidence. A good IGW design satisfies all four domains simultaneously rather than optimizing only raw bandwidth.
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NEW QUESTION # 61
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