H12-891_V1.0 Exam Dumps - HCIE-Datacom V1.0

802.1X Authentication Overview

802.1X is a port-based authentication mechanism used for secure network access control. It involves:

EAPoL (Extensible Authentication Protocol over LAN) communication between the client (supplicant) and the switch (authenticator).

RADIUS communication between the authenticator and the authentication server (AAA server).

✅ A. 802.1X authentication uses EAPoL to exchange authentication information.

EAPoL (Extensible Authentication Protocol over LAN) is used to send authentication packets over Ethernet (IEEE 802.3) networks.

✅ B. In EAP termination mode, the network device terminates EAP packets and re-encapsulates them into RADIUS.

The switch acts as an authentication proxy by terminating EAP sessions and converting authentication information into RADIUS format.

✅ C. EAPoL is for wired (802.3), EAPoW is for wireless (802.11).

EAPoL (EAP over LAN) is used in wired Ethernet networks.

EAPoW (EAP over Wireless) is used in Wi-Fi (802.11) networks.

✅ D. In EAP relay mode, EAP packets are encapsulated into RADIUS using EAPoR (EAP over RADIUS).

The switch does not terminate the EAP session but instead forwards EAP messages to the AAA server inside RADIUS packets.

Reference from Huawei HCIE-Datacom Documentation:

Huawei 802.1X Configuration Guide – EAPoL, EAPoW, and EAPoR

HCIE-Datacom Training Material – AAA Authentication Modes

In the Huawei SD-WAN solution, LAN-side devices (such as CPEs and aggregation routers) use various routing protocols to connect to Layer 3 networks and exchange routes dynamically. The supported protocols include:

✅ A. IS-IS (Intermediate System to Intermediate System)

A link-state protocol often used in large enterprise networks for fast convergence and scalability.

✅ B. OSPF (Open Shortest Path First)

A widely used dynamic routing protocol for intra-domain (LAN) connectivity.

Commonly used in enterprise networks to connect SD-WAN edge routers to LAN networks.

✅ C. BGP (Border Gateway Protocol)

BGP is primarily used for WAN and internet connectivity, but it can also be used inside large enterprise networks for LAN-side routing.

BGP enables inter-domain routing and policy-based route control.

✅ D. RIP (Routing Information Protocol)

A legacy distance-vector protocol still supported in some networks for basic LAN routing.

Less preferred due to slow convergence and hop-count limitations.

Reference from Huawei HCIE-Datacom Documentation:

Huawei SD-WAN Deployment Guide – LAN-Side Routing Protocols

HCIE-Datacom Training Material – Routing Configuration in SD-WAN

A. The device sends sampled data every second → Correct, since sample interval is 1000ms = 1 second.

B. The subscription mode is static subscription → Correct, as shown by Sub state: PASSIVE. Passive indicates a static subscription.

C. The IP address of the device is 192.168.56.1 → Incorrect — this IP address is the destination (telemetry collector), not the device’s own IP.

D. The subscription name is Sub1 → Correct, as per Sub name : Sub1.

Correct answer: C. The IP address of the device is 192.168.56.1 — this is incorrect because it ' s actually the collector’s IP, not the device ' s.

Comprehensive and Detailed Explanation:

✔ 802.1X authentication supports multiple logout mechanisms based on network conditions and security policies.

✔ Correct Logout Modes:

✅ (A) Authentication Server Logout → The RADIUS server can terminate a session.

✅ (B) Manual Logout → Users can disconnect manually.

✅ (C) Access Device Logout → The switch/WLAN controller can enforce logouts (e.g., if inactivity is detected).

✔ Why Not (D)?

❌ (D) Accounting Server Logout → The accounting server tracks session usage but does not enforce logouts.

📖 Reference: Huawei HCIE Datacom – 802.1X Authentication & Session Termination

MP-BGP is an extension of BGP-4 that supports multi-protocol address families such as IPv6, VPNv4, etc. When PE and CE exchange BGP routes, there is no need to create a BGP process per VPN on the CE. The CE typically runs a standard BGP process, while the PE maintains separate VPN routing tables (VRFs).

Exact Extract - Huawei HCIE-Datacom MP-BGP Chapter:

“CE devices use standard BGP, and multiple VPNs can share the same BGP process on the CE. The PE handles VPN route separation through VRFs and MP-BGP.”

Comprehensive and Detailed In-Depth Explanation:

In OSPFv3, the AS-external-LSA (Type 5 LSA) is the only LSA type that can be flooded throughout the entire Autonomous System (AS). It is used to advertise external routes (routes redistributed from other routing protocols or static routes) into the OSPF domain.

B. Intra-Area-Prefix-LSA (Type 9): Used to advertise IPv6 prefixes within an OSPF area, not across the AS.

C. Link-LSA (Type 8): Advertises link-local addresses and options, only within the local link, not the entire AS.

D. Inter-Area-Prefix-LSA (Type 3 or Type 4): Advertises prefixes between OSPF areas but not throughout the entire AS.

Only AS-external-LSAs (Type 5) can be propagated across the whole OSPF AS, making them essential for exchanging routes learned from other routing protocols.

Comprehensive and Detailed Explanation:

iMaster NCE-CampusInsight is Huawei ' s intelligent network analysis platform that:

✔ Collects real-time telemetry data using SNMP, NetStream, and Telemetry.

✔ Analyzes traffic patterns to detect network anomalies.

✔ Uses AI-driven analytics to optimize network performance.

Thus, the statement is TRUE.

📖 Reference: Huawei HCIE Datacom – iMaster NCE-CampusInsight Features

GRE (Generic Routing Encapsulation) has the following benefits:

B. VPN Construction — GRE is often used to build site-to-site VPNs.

C. ARP Encapsulation — GRE supports Layer 2 protocol encapsulation such as ARP.

D. Multicast Support — GRE tunnels can encapsulate multicast packets, unlike traditional IPsec.

A. Enlarging the hop limit is incorrect — GRE does not inherently change TTL or hop behavior; routing protocols still use standard IP processing.

Exact Extract - Huawei HCIE-Datacom Tunneling Chapter:

“GRE can encapsulate multicast and broadcast packets and supports L2 protocols like ARP. It is often used for VPN construction over the internet.”