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| Section | Objectives |
|---|---|
| Network Security and QoS | - QoS mechanisms
|
| Network Automation and Programmability | - SDN and automation
|
| Data Center and Virtualization Technologies | - VXLAN and overlay networks
|
| Routing and Switching Technologies | - IP routing protocols
|
| IPv6 and Advanced IP Technologies | - IPv6 deployment
|
| Enterprise Network Architecture | - Network design principles
|
| WAN and VPN Technologies | - MPLS fundamentals
|
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NEW QUESTION # 89
On a CloudCampus virtualized campus network, which of the following modes can be used by a fabric to connect to external networks?
Answer: A,B,C,D
Explanation:
Comprehensive and Detailed
✔ All four egress modes are supported in Huawei CloudCampus Virtualized Fabric to provide flexibility in connecting external networks.
✔ Modes Explained:
✅ Layer 3 Shared Egress → Multiple VNs share a single Layer 3 gateway for external communication.
✅ Layer 2 Shared Egress → Multiple VNs share the same Layer 2 link to the external network.
✅ Layer 3 Exclusive Egress → Each VN has its own separate Layer 3 gateway to external networks.
✅ Layer 2 Exclusive Egress → Each VN has its own dedicated Layer 2 link for external connectivity.
📖 Reference: Huawei HCIE Datacom - CloudCampus Fabric Egress Modes
NEW QUESTION # 90
Which of the following statements regarding OSPF neighbor relationship faults is incorrect?
Answer: C
Explanation:
Understanding OSPF Neighbor States
OSPF (Open Shortest Path First) establishes neighbor relationships through several states:
1## Down: No Hello packets received.2## Init: Router receives Hello packets but its own Router ID is missing in the received packets.3## 2-Way: Routers see each other in Hello packets. (Stable state for non- DR/non-BDR routers).4## ExStart: Routers start exchanging LSAs but may face MTU mismatches.5## Exchange: Routers send Database Description (DBD) packets to synchronize link-state databases.6## Loading: Routers exchange Link-State Requests (LSRs) & Updates (LSUs) to fully sync.7## Full: Routers are fully synchronized.
Analysis of the Answer Choices
# A. For non-DR and non-BDR routers on an Ethernet link, the 2-Way state is acceptable.
* Correct: Non-DR/Non-BDR routers remain in 2-Way state since they don't need to form full adjacency.
# B. The Init state indicates that the router has received Hello packets from its neighbors, but the received Hello packets do not contain the OSPF RID of the receiving router.
* Correct: If an OSPF router receives a Hello but does not see its own Router ID, it stays in the Init state.
# C. The ExStart state indicates that two neighbor routers have inconsistent MTUs or the same OSPF Router ID (RID).
* Correct: If MTUs mismatch or RIDs conflict, the DBD exchange fails, causing routers to remain in ExStart state.
# D. The Attempt state indicates that the router does not send unicast Hello packets to configured neighbors.
* Incorrect:
* In Attempt state, routers send unicast Hello packets to manually configured neighbors (common in NBMA networks).
* If no Hello responses are received, they remain in Attempt state, but they DO send Hellos.
Real-World Application
* OSPF Troubleshooting: Identifying routers stuck in Init or ExStart states can point to MTU mismatches or neighbor misconfigurations.
* NBMA Networks (Frame Relay, DMVPN): Manually configured neighbors may stay in Attempt state if Hello packets are lost.
# Reference: Huawei HCIE-Datacom Study Guide - OSPF Neighbor States & Troubleshooting
NEW QUESTION # 91
Router RL runs the OSPF protocol and uses the display ip routing-tabe command to view the router RL's routing table , the following information about OSPF in the routing table is described correctly as ?
Answer: A
NEW QUESTION # 92
In the figure, SR-MPLS is enabled on R1, R2, and R3. The SRGB (Segment Routing Global Block) range on R3 is from 20000 to 21000, and the prefix SID index configured on the loopback1 interface of R3 is 30.
In this case, the MPLS label corresponding to the loopback1 interface of R3 is _____.
(Enter an Arabic numeral without symbols.)
Answer:
Explanation:
20030
Explanation:
Understanding SR-MPLS Label Calculation
SR-MPLS uses Segment Routing Global Block (SRGB) and Prefix SIDs to assign labels dynamically. The MPLS label for a node's loopback interface is calculated as follows:
MPLS Label=SRGB Base+Prefix SID Index
Where:
* SRGB Base = 20000 (as given in the figure)
* Prefix SID Index = 30 (configured for R3's Loopback1)
Label Calculation:
20000+30=20030
Thus, the MPLS label corresponding to the loopback1 interface of R3 is 20030.
Why the Answer is 20030?
# The SRGB defines the base label range.# Each router is assigned a unique Prefix SID index.# The label is dynamically computed by adding the Prefix SID Index to the SRGB Base.
Why Other Numbers Are Incorrect?
# Any value outside the range 20000-21000
* Would be incorrect because it must be within R3's SRGB range.
# Using the Prefix SID Index directly (30)
* Incorrect because MPLS labels are not assigned directly using Prefix SIDs; they are computed using the SRGB.
# Reference: Huawei HCIE Datacom - SR-MPLS Label Calculation and SRGB
NEW QUESTION # 93
In a scenario where a VXLAN tunnel is dynamically established through BGP EVPN, which of the following fields is NOT carried in BGP EVPN Type 5 routes?
Answer: B
Explanation:
Understanding BGP EVPN and VXLAN Routing
EVPN (Ethernet VPN) with VXLAN is used for data center networking and L3 VPN interconnection.
🔹 BGP EVPN Route Types & Their Purpose
Type 2: MAC/IP Advertisement Route (Carries MAC + IP)
Type 3: Inclusive Multicast Route (Carries VTEP Multicast Information)
Type 5: IP Prefix Route (Used for Layer 3 VXLAN Routing)
🔹 What does Type 5 route contain?
✅ Route Distinguisher (RD): Identifies a unique VPN instance.
✅ GW IP Address: Specifies the Gateway IP for L3 VXLAN routing.
✅ IP Prefix Length: Defines the IPv4/IPv6 network mask for routing.
❌ MAC Address is NOT included in Type 5
Why is Option B (MAC Address) Correct?
✅ MAC addresses are carried in EVPN Type 2 routes, NOT in Type 5.
✅ Type 5 routes focus on IP prefixes, not MAC forwarding.
🔹 Real-World Application:
VXLAN L3 Gateways (EVPN Type 5) allow routers to forward IP traffic across VXLAN tunnels, removing the need for traditional L3 VPNs.
✅ Reference: Huawei HCIE-Datacom Guide - BGP EVPN and VXLAN Routing
NEW QUESTION # 94
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