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| Section | Weight | Objectives |
|---|---|---|
| Cloud Bearer Network | 8% | - Cloud service bearer requirements - DC interconnect technologies - Cloud interconnection architecture |
| Automatic O&M | 2% | - Monitoring and analysis - Fault management |
| IP Mobile Backhaul | 10% | - Service isolation and QoS - Synchronization and timing - 5G/4G backhaul architecture |
| Tunnel Technologies | 15% | - SR-MPLS and SRv6 - MPLS fundamentals - TE and traffic engineering |
| High Reliability | 8% | - Fault detection and recovery - Fast protection switching - Network redundancy mechanisms |
| Advanced Routing Protocols | 15% | - OSPF advanced features - Route control and fast convergence - BGP and MP-BGP - IS-IS advanced features |
| Multicast Protocols | 6% | - PIM-SM/SSM - MSDP and anycast RP - Multicast QoS |
| Network Orchestration & Automation | 2% | - SDN and controller architecture - iMaster NCE overview |
| VPN Technologies | 15% | - MPLS L3VPN - VPN deployment and troubleshooting - EVPN and VXLAN |
| Backbone Network Planning | 8% | - Architecture design - Capacity and traffic planning - Scalability design |
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NEW QUESTION # 54
The underlay layer of a telco cloud network can use a Layer 3 routing protocol, such as OSPF, IS-IS, or BGP, to provide IP connectivity between spine and leaf nodes.
Answer: B
Explanation:
Huawei Reference Verification:
Huawei's underlay/overlay architecture identifies the underlay as the physical network carrying overlay traffic. Routing protocols provide IP reachability between spine, leaf, and VTEP interfaces. The underlay can run OSPF or IS-IS as link-state protocols or BGP as a routed IP-fabric control plane. These distribute the reachable infrastructure networks and loopback addresses required for EVPN VXLAN tunnel operation. The overlay then supplies logical tenant/service connectivity while relying on the underlay to deliver encapsulated packets. This directly supports the statement that OSPF, IS-IS, or BGP can provide the spine-leaf Layer 3 underlay.
Technical Deep Dive:
A is TRUE. A routed spine-leaf fabric requires IP connectivity between infrastructure nodes and VXLAN tunnel endpoints. OSPF exchanges LSAs and calculates SPF paths. IS-IS performs link-state routing using LSPs and is commonly deployed in carrier networks. EBGP can provide a scalable routed leaf-to-spine design without extending one large IGP everywhere. When VXLAN is used, VTEP loopback addresses must resolve through an underlay route; an EVPN service route is unusable if its VTEP next hop cannot be reached. Equal- cost routes across multiple spines allow ECMP load distribution. The controller or routing processes compute network reachability, while the forwarding ASIC consults the installed FIB and implements the chosen next- hop/tunnel operations. Huawei VRP commands `display ospf peer`, `display isis peer`, `display bgp peer`,
`display ip routing-table`, and `display fib` establish whether underlay adjacency, reachability and forwarding state are healthy.
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NEW QUESTION # 55
Which of the following statements are correct regarding the reliability of MVPNv4 over BIERv6?
Select all that apply.
Answer: A,B,C,D
Explanation:
Huawei Reference Verification:
Huawei's MVPNv4 over BIERv6 reliability architecture supports dual-root 1+1 protection in which primary and backup multicast ingress paths can be established concurrently. Separate routing paths reduce the impact of a single shared failure. The receiving PE can obtain packets through both roots but normally delivers one selected stream into the customer VPN to avoid duplicate service delivery. Upon loss of primary traffic it evaluates availability of the backup stream and may initiate a C-multicast rejoin when both reception paths are impaired. Huawei-China Unicom interoperability testing demonstrated dual-root BIERv6 recovery, supporting the principal architecture. The exact C-multicast recovery trigger remains release-specific.
Technical Deep Dive:
A, B, C and D are the intended answers. Planning diverse primary and backup tunnels reduces common-mode failure exposure. With 1+1 dual-root protection the sender's multicast flow is injected toward receiver PEs via both ingress roots, allowing a receiver to keep the backup copy available before failure. Normally only one copy is forwarded to the private/customer VPN. If the preferred primary stream fails, the receiver uses the valid backup stream; if backup reception is also abnormal, the MVPN control plane may resignal a C- multicast route to restart receiver membership. The mechanism differs from 1:1 cold restoration, which would need to establish a new path after failure. BIERv6 uses per-set BitStrings and a BIFT, so transit routers need not maintain every customer (S,G) state. The exact timing and resignal behavior in C depends on the product implementation; the overall 1+1 dual-root concept is established.
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NEW QUESTION # 56
Which of these statements are correct regarding IS-IS reliability parameters on a 5G transport network?
Select all that apply.
Answer: A,B,C,D
Explanation:
Huawei Reference Verification:
Huawei's 5G transport IS-IS reliability design combines intelligent SPF and LSP-generation timers with precomputed TI-LFA protection, microloop avoidance and Graceful Restart. Maximum, initial and incremental delays of 1 second, 50 milliseconds, and 50 milliseconds are a recommended convergent tuning pattern for both SPF and LSP generation in the intended solution. TI-LFA protects eligible failures locally, and microloop avoidance reduces transient forwarding loops when routers converge at different times.
Graceful Restart can preserve continuity during supported routing-control restarts. These complementary functions support all four options, provided GR is not misinterpreted as protecting against arbitrary permanent neighbor disconnection.
Technical Deep Dive:
A, B, C and D represent the intended reliability design. The intelligent SPF timer reacts rapidly to a first topology change, then increases the wait during repeated changes to control CPU load. The LSP-generation timer similarly limits excessive update flooding while maintaining rapid distribution of meaningful state changes. The representative values are 1000, 50, 50 in milliseconds. TI-LFA precomputes backup next-hop instructions and allows rapid repair when a link or protected node fails; microloop avoidance reduces short- lived loops during distributed reconvergence. IS-IS GR permits routing-state and forwarding continuity across an eligible process restart with neighbor helper behavior, but not across every physical failure. Example VRP commands are `isis 1`, `timer spf 1000 50 50`, `timer lsp-generation 1000 50 50`. Exact timer syntax and protection availability must match the device release. A proper reliability plan combines fault detection, local switching, and stable eventual convergence.
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NEW QUESTION # 57
Which of these statements is incorrect regarding SRv6 SFC?
Answer: D
Explanation:
Huawei Reference Verification:
Huawei's SRv6 Service Function Chaining architecture distinguishes SRv6-aware functions capable of recognizing service-chain encapsulation from SRv6-unaware functions such as conventional firewalls or load balancers. An aware SF can execute or be associated with an SRv6 SID within the orchestrated chain. An unaware SF cannot independently process the required SRv6 service-chain behavior; an SRv6/SFC proxy adapts the incoming packet to the SF's expected format and restores the forwarding context afterward.
Therefore B, claiming that an unaware SF can implement the chain without an appropriate proxy, is incorrect.
Technical Deep Dive:
B is incorrect. SFC directs service traffic through a defined sequence of middleboxes or virtual network functions, such as firewall, IPS and load balancer. SRv6 uses SIDs to encode the forwarding and service behaviors of this chain. SRv6-aware functions can recognize the relevant encapsulation and participate directly. An SRv6-unaware appliance may process ordinary IPv4 or IPv6 but cannot execute the specialized SRv6 service-chain instructions; a proxy handles encapsulation, decapsulation or metadata adaptation so that the appliance can operate normally. The proxy also ensures that packets returning from the service function rejoin the intended segment list. D is correct in the intended model because aware functions can be represented by orchestratable service SIDs. C is overbroad if interpreted as saying every unaware device categorically discards every IPv6 packet, but it captures the operational limitation that the device cannot process SRv6 chain metadata unassisted.
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NEW QUESTION # 58
Which of the following statements is incorrect about address planning for an IP core network?
Answer: A
Explanation:
Huawei Reference Verification:
Huawei's backbone routing design emphasizes aggregate reachability, consistent address blocks, and controlled routing-table size. Route aggregation advertises a summary prefix instead of numerous more- specific prefixes and benefits from hierarchical, consecutive address allocation. Capacity reservations at each network layer prevent disruptive renumbering as access and backbone infrastructure grows. Choosing private IPv4 addresses for interconnections solely to conserve address space can create overlaps and complications when carrier domains are interconnected. This supports C as the intended incorrect recommendation, while recognizing that private addressing can still be legitimate in a properly isolated routing domain.
Technical Deep Dive:
C is the intended incorrect statement. Carrier backbone addressing must enable unique infrastructure identification, predictable expansion, route summarization, and efficient troubleshooting. Reserving address blocks for planned growth supports new links, loopbacks and router additions (A). Consecutive assignments within regional and hierarchical address blocks support maintenance and aggregate advertisements (B).
Aggregation reduces protocol processing and the number of forwarding entries when summarization boundaries are properly positioned (D). Private RFC 1918 addresses are not categorically forbidden on internal point-to-point links; they can be appropriate when the operator controls the entire routing domain.
However, overlaps and external interconnection requirements complicate indiscriminate use, so conserving public addresses alone is not a sufficient planning rule. Engineers should validate address allocations with
`display ip interface brief`, `display ip routing-table`, and `display ip routing-table statistics`. On forwarding hardware, aggregation can reduce FIB consumption but must not hide needed individual reachability.
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NEW QUESTION # 59
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