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  1. Home
  2. Huawei Certification
  3. H12-891_V1.0 Exam
  4. Huawei.H12-891_V1.0.v2026-06-05.q295 Dumps
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Question 61

Which of the following fields is added to BGP4+ Update packets to advertise IPv6 routes?

Correct Answer: B
Comprehensive and Detailed In-Depth Explanation:
BGP4+ (BGP for IPv6) uses theMP_REACH_NLRI(Multiprotocol Reachable Network Layer Reachability Information) attribute to advertise IPv6 routes. This attribute is part of BGP ' s multiprotocol extensions (RFC
2858), allowing BGP to support multiple address families, including IPv6.
MP_REACH_NLRI:Advertises reachable IPv6 prefixes along with next-hop information.
MP_UNREACH_NLRI:Used to withdraw previously advertised IPv6 routes.
Since IPv6 addresses are significantly different from IPv4 addresses in structure and length (128 bits), the traditional BGP update message format (which supports only IPv4) is insufficient.
TheMP_REACH_NLRIattribute solves this by carrying IPv6-specific information.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei BGP Configuration and Implementation Guide
RFC 2858: Multiprotocol Extensions for BGP-4
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Question 62

What can be determined from the following figure?
<R1> display ipv6 routing-table protocol isis
Public Routing Table : ISIS
Summary Count: 6
ISIS Routing Table's Status : < Active >
Summary Count: 6
Destination : 3000:FDEA::4
NextHop : FE80::2E0:FCFF:FE98:2577
Cost : 20
Interface : GigabitEthernet0/0/1
PrefixLength : 128
Preference : 15
Protocol : ISIS-L2
Flags : D

Correct Answer: A,C,D
* Analyzing the Routing Table Output:
* The command display ipv6 routing-table protocol isis shows all IPv6 routes learned via IS-IS.
* The output shows "Summary Count: 6", meaning R1 has six IS-IS IPv6 routes.
* Explanation of Correct Answers:# A. R1 has six IS-IS IPv6 routes.
* The "Summary Count: 6" confirms that six IS-IS IPv6 routes exist in R1's routing table.
# C. IS-IS IPv6 must have been enabled on GigabitEthernet0/0/1 of R1.
* The interface GigabitEthernet0/0/1 is listed as the next-hop, meaning IS-IS IPv6 must be enabled on that interface.
# D. R1 is not a Level-1 device.
* The protocol is listed as "ISIS-L2", indicating that R1 is an IS-IS Level-2 (backbone) router, not a Level-1 router.
* Incorrect Answer Explanation:# B. R1 does not have IS-IS IPv6 routes.
* Wrong! The output clearly shows six IS-IS IPv6 routes, proving this statement false.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei IPv6 Routing Protocols Guide - IS-IS for IPv6
* HCIE-Datacom Routing & Switching Training - IS-IS L1 & L2 Operations
* Huawei IS-IS Configuration Guide - IPv6 Route Management
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Question 63

As shown in the figure, a sham link is established between PE1 and PE2 through the loopback interfaces. CE2 can learn the 192.168.1.0/24 route (directed route on CE1) through the sham link and backdoor link. If other parameters use their default settings, the cost of the 192.168.1.0/24 route on CE2 should be ______. (Enter an Arabic numeral without symbols.)

Correct Answer:
20This is a classicMPLS L3VPN with OSPF + Sham Linkscenario.Key Components:CE1 to PE1 (GE0/0/0):
OSPF cost = 10CE2 to PE2 (GE0/0/0): OSPF cost = 10PE1 to PE2 via Sham Link (over loopback interfaces) What happens:CE1 advertises192.168.1.0/24to PE1.PE1 redistributes it into theVPNv4 BGProuting table.PE2 learns this route and redistributes it back into OSPF for CE2.Route Options Seen by CE2:Backdoor link (intra- area):CE1 # CE2 directly, via GE0/0/1 on each CE # OSPF cost = 10 + 10 =20Sham Link (inter-area route):
By default, if nosham linkis used, the BGP-learned route is treated as aninter-arearoute by CE2, with a default OSPF cost of1(which would make CE2 prefer this over the real CE-CE backdoor link).Purpose of Sham Link:
Sham linkis configured toequalizeoroverridethe cost of the BGP route so that CE2prefers the backdoor linkor sees both paths equally.In this case, Huawei defaults will cause CE2 to compute the total cost as:PE1-CE1 =
10Sham link route via PE1-PE2-CE2 = also10 (CE1 to PE1) + 10 (PE2 to CE2)=20Final OSPF Cost Calculation at CE2:Route learned via sham link path: 10 (CE1 to PE1) + 10 (PE2 to CE2) =20Correct answer:
20In Huawei MPLS L3VPN OSPF deployment:Asham linkensures that the cost via the MPLS VPN path iscomparable to the real CE-to-CE OSPF backdoor path, preventing suboptimal routing.Without sham link:
BGP redistributed routes appear asinter-area Type 3 LSAswith low cost (usually 1).With sham link: Route appears asintra-areaand OSPF calculates true cost based on interface metrics.
Reference:Huawei HCIE-Datacom V1.0 Study GuideChapter:MPLS L3VPN Integration with OSPFSection:
Sham Link Design and Cost Calculation
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Question 64

Which of the following types of EVPN routes does not carry MPLS labels?

Correct Answer: C
Comprehensive and Detailed Explanation:
Ethernet VPN (EVPN) is an advanced L2VPN technology that enhances MAC learning and forwarding in data center and enterprise networks. Different EVPN route types are used for various functions:
* Ethernet A-D (Auto-Discovery) Route: Used for auto-discovery of PE devices and does carry labels
.
* MAC/IP Advertisement Route: Distributes MAC-to-IP mappings and carries labels for forwarding decisions.
* Ethernet Segment Route: Does not carry MPLS labels as it is used to signal multi-homing and redundancy information.
* Inclusive Multicast Route: Used for multicast forwarding and carries labels for tunnel identification.
Since Ethernet Segment Route is used only for multi-homing signaling and does not carry MPLS labels, the correct answer is C.
# Reference: Huawei HCIE Datacom Study Guide - EVPN Route Types
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Question 65

Refer to the figure.

Which of the following steps are mandatory to enable 802.1X authentication on GE0/0/2 and GE0/0/3 of SW3 and configure a RADIUS server to authenticate and deliver network access rights to users?

Correct Answer: A,B,C,D
Understanding 802.1X Authentication in Enterprise Networks
# What is 802.1X?
802.1X is a network access control (NAC) protocol that enforces authentication before allowing a device to connect to a LAN.
It usesEAP (Extensible Authentication Protocol)overRADIUSfor user verification.
Typically deployed incorporate and campus networksforsecure wired and wireless access.
# How Does 802.1X Work?
1##Client (Supplicant) # Requests network access.
2##Switch (Authenticator) # Forwards request to RADIUS server.
3##RADIUS Server # Verifies credentials & grants access.
Mandatory Steps to Enable 802.1X on SW3
#A. Configure an AAA Scheme
Defines authentication, authorization, and accounting (AAA) methods.
Links802.1X authentication to the RADIUS server.
#B. Configure an Authentication Profile
Specifies how authentication is handled on the switch.
Associates802.1X authentication with an AAA scheme.
#C. Configure an Authentication Domain
Groups authentication policies for different user types.
MapsAAA scheme to user login requests.
#D. Configure an 802.1X Access Profile
Applies 802.1X authentication to specific switch ports (GE0/0/2 & GE0/0/3).
Ensures thatonly authenticated users can pass traffic.
Why Are All Four Steps Necessary?
#Each step plays a critical role in enabling 802.1X authentication and linking it to the RADIUS server.
#Without any one of these configurations, the 802.1X authentication process would fail.
Real-World Application:
Enterprise Wired Security:Ensures thatonly authenticated devicesaccess corporate networks.
University Campuses & Public Wi-Fi:Prevents unauthorized access tosecure LAN environments.
#Reference:Huawei HCIE-Datacom Guide - 802.1X Authentication & RADIUS Server Configuration
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