PROFESSIONAL 100% FREE H12-891_V1.0–100% FREE EXAM QUICK PREP | RELIABLE H12-891_V1.0 EXAM SIMS

Professional 100% Free H12-891_V1.0–100% Free Exam Quick Prep | Reliable H12-891_V1.0 Exam Sims

Professional 100% Free H12-891_V1.0–100% Free Exam Quick Prep | Reliable H12-891_V1.0 Exam Sims

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Huawei H12-891_V1.0 (HCIE-Datacom V1.0) Exam is a certification exam that is designed for professionals who want to validate their expertise in the field of data communication. H12-891_V1.0 exam is conducted by Huawei, which is a leading provider of information and communications technology (ICT) solutions. The HCIE-Datacom V1.0 certification exam is intended for professionals who are responsible for designing, implementing, and managing large-scale data communication networks.

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Huawei HCIE-Datacom V1.0 Sample Questions (Q61-Q66):

NEW QUESTION # 61
As shown in the figure, what is known about the default routes on R4?
Routing Table on R4:
<R4>display ip routing-table protocol isis
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 ISIS-L1 15 10 D 10.1.24.1 GigabitEthernet0/0/1
ISIS-L1 15 10 D 10.1.34.1 GigabitEthernet0/0/0
172.16.1.2/32 ISIS-L1 15 10 D 10.1.24.1 GigabitEthernet0/0/1
172.16.1.3/32 ISIS-L1 15 10 D 10.1.34.1 GigabitEthernet0/0/0

  • A. Two equal-cost default routes
  • B. Four equal-cost default routes
  • C. Two default routes with different costs
  • D. One default route

Answer: A

Explanation:
Understanding the Routing Table Entries on R4
* 0.0.0.0/0 (Default Route) is installed twice in the routing table.
* The NextHop values for the default route:
* 10.1.24.1 (GigabitEthernet0/0/1)
* 10.1.34.1 (GigabitEthernet0/0/0)
* Cost: Both routes have a metric (Cost) of 10, meaning they are equal-cost routes.
* Protocol: ISIS-L1 (Intermediate System to Intermediate System - Level 1) confirms these routes are coming from IS-IS routing.
* Flags: D (Dynamic) means these routes were dynamically learned via IS-IS.
Why is Option D Correct?
* Since both routes have the same cost (10), they are considered equal-cost default routes.
* The router will use both routes in a load-sharing fashion.
* The answer is NOT A (Four equal-cost routes) because there are only two default routes, not four.
* The answer is NOT B (One default route) because there are two default routes in the table.
* The answer is NOT C (Two default routes with different costs) because both routes have the same cost (10).
Real-World Application
* Equal-Cost Multi-Path (ECMP): The router can perform load balancing across the two equal-cost paths.
* Resilience & Redundancy: If one link fails, the other can take over without re-calculating the entire routing table.
# Reference: Huawei HCIE-Datacom Study Guide - IS-IS Routing & ECMP Load Balancing


NEW QUESTION # 62
A VRRP virtual router configuration VRID is 3 and the virtual IP address is 100 1. 1. 10, so what is the virtual MAC address?

  • A. 00-00-5E-00-01-03
  • B. 01-00-5E-00-01-03
  • C. 01-00-5E-00-01-54
  • D. O0-00-5E-00-01-64

Answer: A


NEW QUESTION # 63
As shown in the figure, ARP broadcast suppression is enabled on VTEP1 in BD 20 (VNI 200).
* VTEP1 learns ARP information about PC2 through BGP EVPN routes.
* When VTEP1 forwards the ARP request for PC1's MAC address to VTEP2,
* What is the destination MAC address of the inner data frame?

  • A. MAC A
  • B. MAC D
  • C. MAC C
  • D. MAC B

Answer: C

Explanation:
Understanding VXLAN and ARP Suppression in BGP EVPN
VXLAN (Virtual Extensible LAN) is used to extend Layer 2 networks over Layer 3 infrastructure.
* VXLAN uses VTEPs (VXLAN Tunnel Endpoints) to encapsulate and forward Layer 2 traffic.
* BGP EVPN (Ethernet VPN) is used for MAC/IP address learning and distribution across VXLAN networks.
How ARP Request Forwarding Works in This Scenario?
1## ARP Broadcast Suppression Enabled (VXLAN Optimized Forwarding)
* Since ARP broadcast suppression is enabled on VTEP1, the ARP request is not flooded.
* Instead, VTEP1 checks its EVPN learned database to find PC2's MAC address (MAC C).
2## VTEP1 Encapsulates the ARP Request
* VTEP1 encapsulates the ARP request in a VXLAN packet and sends it to VTEP2.
* The original ARP frame inside the VXLAN tunnel still has:
* Source MAC: MAC A (PC1's MAC)
* Destination MAC: MAC C (PC2's MAC, learned via EVPN)
3## VXLAN Outer Headers
* The outer VXLAN header uses:
* Source IP: 1.1.1.1 (VTEP1)
* Destination IP: 2.2.2.2 (VTEP2)
* VNI (VXLAN Network Identifier): 200 (BD 20)
4## VTEP2 Receives and Forwards the ARP Request
* VTEP2 decapsulates the VXLAN packet and forwards the original ARP request to PC2 (MAC C).
* This ensures that only the intended receiver (PC2) gets the ARP request, preventing unnecessary broadcast flooding.
Why the Answer is MAC C?
# B. MAC C is Correct
* The destination MAC of the inner data frame is PC2's MAC (MAC C).
* This is because VTEP1 forwards the ARP request directly to VTEP2, which then forwards it to PC2.
Why Other Answers Are Incorrect?
# A. MAC B (Incorrect)
* MAC B is VTEP1's MAC address, which is used in the outer VXLAN header, not in the inner Ethernet frame.
# C. MAC A (Incorrect)
* MAC A is the source MAC of the ARP request (PC1), not the destination.
# D. MAC D (Incorrect)
* MAC D is not mentioned in the topology, so it is irrelevant.
# Reference: Huawei HCIE Datacom - VXLAN BGP EVPN and ARP Suppression


NEW QUESTION # 64
To allow only authorized users (users who obtain IP addresses through authorized DHCP servers or use specified static IP addresses) to access the network shown in the figure, which of the following solutions can be used?

  • A. DAI + IPSG
  • B. DHCP Snooping + IPSG
  • C. DAI + Port Security
  • D. DHCP Snooping + DAI

Answer: B

Explanation:
Understanding Network Security for Authorized User Access
# Problem Scenario:
* Only authorized users should be allowed network access.
* Users can obtain IP addresses either via DHCP or a predefined static IP list.
* Unauthorized users (e.g., attackers using rogue DHCP servers or spoofed IPs) must be blocked.
# Required Technologies for Securing Access:1## DHCP Snooping - Protects against rogue DHCP servers and builds a binding table of legitimate DHCP clients.2## IP Source Guard (IPSG) - Ensures that only authorized IP-MAC bindings can send traffic.
Analysis of the Answer Choices:
# A. DAI + Port Security (Incorrect)
* DAI (Dynamic ARP Inspection) prevents ARP spoofing but does not validate IP-MAC-DHCP bindings.
* Port Security only limits MAC addresses per port but does not verify IP addresses.
* Does NOT protect against unauthorized static IP users.
# B. DHCP Snooping + IPSG (Correct)
* DHCP Snooping:
* Prevents rogue DHCP servers from assigning unauthorized IPs.
* Builds a DHCP binding table (IP-MAC-Port).
* IP Source Guard (IPSG):
* Blocks traffic from IPs not listed in the DHCP snooping binding table.
* Can be configured to allow manually specified static IP addresses.
* Best choice to allow only authorized users (both DHCP and static IP users).
# C. DHCP Snooping + DAI (Incorrect)
* DAI (Dynamic ARP Inspection) prevents ARP spoofing but does not block unauthorized static IP users.
* Lacks IP-level access control needed to enforce static IP policies.
# D. DAI + IPSG (Incorrect)
* IPSG (IP Source Guard) needs DHCP Snooping to build the binding table.
* Without DHCP Snooping, IPSG cannot function properly.
* DAI does not provide complete protection against unauthorized users.
Why is the Answer B (DHCP Snooping + IPSG)?
# Ensures only users assigned a DHCP IP (or authorized static IPs) can send traffic.# Blocks rogue DHCP servers and unauthorized static IP users.
Real-World Application:
* Enterprise Networks: Prevents unauthorized static IP users or attackers from accessing VLANs.
* Public Wi-Fi Security: Ensures only authorized users receive IPs and can send traffic.
# Reference: Huawei HCIE-Datacom Guide - DHCP Snooping and IPSG Security Mechanisms


NEW QUESTION # 65
What kind of scenario can use AS one path and one filter?

  • A. If-natch clause answer in Route-policy.
  • B. Filter routes sent to BGP neighbors based on the AS PATH attribute that the route carries. For example, the command peerx. X.x.x as path-filter export
  • C. Filter routes received from BGP neighbors based on the AS PATH attribute that the route carries. For example, the command peer x.X.x.x as path-filter import
  • D. The apply clause in Routepolicy

Answer: A,B,C


NEW QUESTION # 66
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