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| Section | Weight | Objectives |
|---|---|---|
| Carrier IP Network Architecture | 10% | - Carrier Network Evolution
|
| Network Service Technologies | 10% | - Carrier Services
|
| Network Operation and Maintenance | 5% | - Monitoring and Troubleshooting
|
| BGP Advanced Technologies | 20% | - Carrier-Grade BGP
|
| IGP Advanced Technologies | 15% | - OSPF and IS-IS Advanced Features
|
| Network Reliability and Protection | 7% | - High Availability Design
|
| Network Automation and SDN | 5% | - Automation Technologies
|
| MPLS and Segment Routing | 20% | - Carrier Transport Technologies
|
| IPv6 Technologies | 8% | - IPv6 Deployment
|
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NEW QUESTION # 20
As illustrated, L3VPN services are transported over an SRv6 TE Policy, with SRv6 enabled through IS-IS extensions. The network has deployed the following protection technologies, but fast fault detection has not been configured. Under normal conditions, traffic on the upper plane follows CE1 # PE1 # P1 # PE2 # CE2. If PE2 fails, which technology preferentially provides protection?
Exhibit 59.1 - Original topology/configuration figure
Answer: B
Explanation:
Huawei Reference Verification:
Huawei SRv6 TE Policy protection distinguishes failures of midpoint transit nodes from failure of an egress PE serving a customer VPN. Egress protection prepares an alternate egress PE capable of executing the relevant VPN forwarding service when the primary egress fails. The depicted normal path terminates at PE2, while PE4 provides redundant reachability to CE2. Midpoint repair would not by itself replace the unavailable service endpoint. Therefore egress protection is the intended mechanism when PE2 fails, regardless of whether BFD has been configured for fast detection.
Technical Deep Dive:
B is correct. Under normal operation L3VPN traffic traverses CE1 - > PE1 - > P1 - > PE2 - > CE2. PE2 is the service egress. Failure of PE2 removes the endpoint that performs the final SID behavior and VPN delivery.
Egress protection allows the repair point to redirect packets toward a backup PE such as PE4 that has suitable service forwarding information and reachability to CE2. Midpoint protection addresses transit failures rather than loss of the VPN endpoint. SRv6 TE hot standby changes segment lists or candidate paths, but alone does not necessarily provide a functioning alternate service egress. BFD would normally improve detection and switching time; without it, interface state or IGP/other fault indications can still identify a failure, with potentially slower reaction. The protection architecture must provide backup egress service state and suitable routing information to deliver the customer packet correctly.
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NEW QUESTION # 21
In the transport network shown, two-level RRs are deployed, and RTA has the directly connected network segment 10.1.1.0/30. Which of the following statements about the BGP deployment solution are incorrect?
Exhibit 28.1 - Original topology/configuration figure
Answer: A
Explanation:
Huawei Reference Verification:
Huawei's hierarchical BGP route-reflector deployment lets a lower-level RR be a client of an RR at a higher level, extending route distribution without requiring client-to-client full-mesh sessions. Redundant RRs serving the same cluster can use the same cluster ID. Ordinary edge clients can peer with their selected Level-
1 RRs and learn reflected routes without peering with one another. RRs on the same tier do not have to be configured as each other's route-reflector clients; non-client IBGP relationships or other hierarchy rules can supply the required connectivity. Therefore the assertion that same-level RRs must be each other's clients is incorrect.
Technical Deep Dive:
C is incorrect. In the illustrated two-level design, RTA and RTB each peer with the redundant Level-1 RRs; Level-2 RRs operate as clients of the Level-1 layer to receive the needed routes. A direct IBGP adjacency between RTA and RTB is not mandatory because both can learn eligible routes through their RRs. RRs in a shared redundancy cluster may use the same cluster identifier for consistent loop detection, but this is not a universal rule across unrelated clusters. Route-reflection client relationships are directional configuration properties: not all RRs at one level need to treat their peer RRs as clients. RRs may establish ordinary non- client peering where appropriate. The BGP Originator ID and Cluster List attributes prevent reflection loops as routes pass through the hierarchy. Route deployment must also consider route visibility and path diversity; making every same-tier RR a mutual client is neither necessary nor a normal scaling principle.
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NEW QUESTION # 22
Which statement below is incorrect regarding SRv6 networks?
Answer: A
Explanation:
Huawei Reference Verification:
Huawei SRv6 implementations support reduced encapsulation in which the active SID is placed in the outer IPv6 destination address. When only one SID is required and no additional SRH metadata must be carried, an SRH can be omitted. The SRH is normally used when several ordered segments must be represented or processing requires its additional fields. RFC 8986 explicitly permits reduced SRH encapsulation for applicable cases. Thus D is incorrect because it claims that the SRH is compulsory even for a single-SID path.
Technical Deep Dive:
D is incorrect. SRv6 represents an ordered list of SIDs using the outer IPv6 destination and, when needed, a Segment Routing Header containing the remaining segment list. When a packet needs only one service SID, the SID can be placed directly in the IPv6 destination address, removing unnecessary extension-header bytes.
This is especially useful in SRv6 Best Effort service transport such as an IPv4 VPN using an End.DT4 egress SID. The ingress encapsulates the original packet, transit routers use IPv6 routing toward the locator, and the egress PE executes the SID behavior and VPN-table lookup. Manually configured versus dynamically allocated End.DT4 SIDs follow platform precedence rules; End SIDs must be unique within the relevant SID addressing domain. C states a Huawei-specific interface restriction and should not be treated as a generic IETF limitation on all SRv6 platforms. Reduced encapsulation improves efficiency but does not mean SRv6 VPN transport always has zero encapsulation overhead.
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NEW QUESTION # 23
The topology shown is a typical transport-network access-layer structure. Each core-network device is dual- homed to two CEs, and the CEs and PEs are interconnected in a square-loop topology. The access layer must carry voice and signaling services. Two VPN instances must be configured on each CE to isolate voice services from signaling services and provide security and QoS. Signaling services are transmitted in active
/standby mode, while voice services are transmitted in load-balancing mode. VRRP must be enabled between the two CEs to terminate signaling flows. From the perspectives of network robustness and architectural suitability, which statements about this topology are correct?
Exhibit 60.1 - Original topology/configuration figure
Select all that apply.
Answer: A,D
Explanation:
Huawei Reference Verification:
Huawei's square-loop carrier access design uses dual-homed CEs and redundant PEs to maintain voice and signaling service reachability during individual failures. Separate VPN instances protect service isolation and enable differentiated QoS. A CE-to-CE link must have sufficient engineered bandwidth to carry the traffic diverted to it during failure conditions; a conservative recommendation is capacity at least as large as the relevant CE-PE interconnection. Higher-volume media services can be mapped to GE and lower-volume signaling services to FE in the intended equipment layout. GE and FE ports cannot simply be mixed in one conventional Eth-Trunk, and choosing GE rather than POS for every CE-PE connection is not an unconditional rule. Thus C and D are the intended topology choices.
Technical Deep Dive:
C and D are the intended answers. The topology has two CEs connected to redundant PEs, with a square-loop design and separate voice/media and signaling VPN instances. VRRP provides active/standby gateway behavior for the signaling service, while voice media can use load-balanced forwarding according to service design. During a CE-PE failure the surviving CE-to-CE connection may carry diverted traffic; the inter-CE link should be sized to the expected failure-state traffic, and engineering it to at least the CE-PE bandwidth is a conservative design objective. GE has higher capacity and is suitable for voice/media concentration, while FE may suffice for the smaller signaling load. Option A incorrectly presents GE-only CE-PE transport as mandatory; POS may also carry routed transport services when appropriate. Option B incorrectly proposes mixing GE and FE links as Eth-Trunk members despite compatibility and rate requirements. QoS priorities and bandwidth reservations must also preserve low latency and low jitter for real-time services. Neither C nor D is a universal physical law: capacity and interface rates should match measured worst-case failure traffic and service requirements.
NEW QUESTION # 24
On the HoVPN illustrated, which of the following statements about the network are correct?
Exhibit 49.1 - Original topology/configuration figure
Select all that apply.
Answer: A,B,D
Explanation:
Huawei Reference Verification:
Huawei Hierarchy of VPN (HoVPN) divides service roles between an Underlayer PE, a Superstratum PE, and a Network PE. The UPE handles customer attachment and can use a default VPN route advertised by the SPE instead of hosting all remote VPN prefixes. The SPE advertises itself as next hop toward the UPE and learns remote service routes from the NPE with the NPE as next hop. The SPE also allocates local labels when advertising VPN routes across hierarchical boundaries, so the labels used on the UPE-SPE and SPE-NPE segments do not necessarily match. Accordingly B, C and D are correct.
Technical Deep Dive:
B, C and D are correct. HoVPN distributes provider-edge service processing to improve scalability in large access and aggregation networks. The UPE attaches customer traffic and can have smaller VPN routing tables. The SPE maintains fuller VPN information, advertises a default/summary route to the UPE and acts as its next hop. Toward the backbone, the SPE learns VPNv4 routes from the NPE, making the NPE the next hop for those routes. The SPE can reallocate or rewrite VPN labels as it advertises routes between hierarchy levels, so option A is incorrect. At forwarding time the SPE may terminate one hierarchical VPN context and apply a new label stack for the next network segment. This approach reduces memory and control-plane requirements on access PEs while retaining large VPN service scale. The figure's UPE-SPE and SPE-NPE arrows illustrate the asymmetric route distribution central to the answer.
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NEW QUESTION # 25
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