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| Section | Weight | Objectives |
|---|---|---|
| Campus Network Planning and Deployment | 23% | - Campus Network Architecture
|
| WAN Interconnection Network Planning and Deployment | 8% | - MPLS VPN
|
| Bearer WAN Planning and Deployment | 15% | - VPN Services
|
| Network Automation | 17% | - NCE (Network Cloud Engine)
|
| Advanced Routing and Switching Technology | 37% | - IS-IS
|
>> Valid Dumps H12-891_V1.0 Questions <<
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NEW QUESTION # 134
MPLS implements data forwarding based on two different planes. Which of the following statements regarding the forwarding mechanism are correct?
Answer: B
Explanation:
Understanding MPLS Forwarding Mechanism
MPLS (Multiprotocol Label Switching) is a high-performance forwarding mechanism that operates on two planes:
1##Control Plane:
EstablishesLabel Switched Paths (LSPs)using protocols likeLDP (Label Distribution Protocol),RSVP-TE (Resource Reservation Protocol - Traffic Engineering), orBGP-LU (BGP Label Unicast).
Assignslabelsto packets based on routing policies.
2##Data Plane (Forwarding Plane):
Uses aLabel Forwarding Information Base (LFIB)instead of traditional IP routing.
Packets areforwarded based on labels, not IP addresses.
Analysis of the Answer Choices
#C. The system automatically assigns an ID to the upper-layer application that uses a tunnel. This ID is also called the tunnel ID.
Correct:MPLS assigns aTunnel IDto applications that utilize tunnels (e.g.,VPNs, MPLS-TE, or L2/L3 services).
This ID helpsdifferentiate between various tunnel applications, ensuring traffic follows the correct LSP.
#A. After an IP packet enters an MPLS domain, the MPLS device forwards the packet based on FIB table queries.
Incorrect:MPLS routersdo NOT use the FIB (Forwarding Information Base)for forwarding once labels are assigned.
Instead, they useLFIB (Label Forwarding Information Base)to switch packets based on labels.
#B. If the tunnel ID is 0x0, the MPLS forwarding process starts.
Incorrect:If theTunnel ID is 0x0, MPLSdoes NOT start; it means no label is assigned, and traditionalIP forwardingoccurs.
#D. If the tunnel ID is not 0x0, the normal IP forwarding process starts.
Incorrect:If the Tunnel ID isnot0x0, MPLSforwards traffic using label switching, not IP forwarding.
NEW QUESTION # 135
Network Admission Control (NAC) needs to be deployed on the network shown in the figure. Drag a proper authentication mode to each authentication point.
Answer:
Explanation:
Correct Matching of Authentication Methods:
1#802.1X authentication#PC (GE0/0/2 on SW3)
2#MAC address authentication#IP Phone (GE0/0/3 on SW3)
3##Portal authentication#Wireless Clients (Connected via SW2/AP)
Understanding Network Admission Control (NAC) Authentication Methods
# Network Admission Control (NAC)enforcessecurity policies before allowing devices onto the network.
# Different types of devices requiredifferent authentication methodsbased oncapabilities and security requirements.
Analysis of Each Authentication Type:
#1##802.1X Authentication (Used for PC on GE0/0/2 of SW3)
Best for devices that support user authentication (e.g., PCs, Laptops).
Requiressupplicant software (e.g., Windows or macOS built-in 802.1X client).
Providesstrong security using EAP (Extensible Authentication Protocol) over RADIUS.
#2##MAC Address Authentication (Used for IP Phone on GE0/0/3 of SW3)
Best for devices that do not support username/password authentication (e.g., IP Phones, IoT devices).
UsesMAC addresses as identity credentials.
Suitable forVoIP networks, industrial IoT, and surveillance cameras.
#3##Portal Authentication (Used for Wireless Clients on SW2/AP)
Best for guests or mobile users accessing Wi-Fi networks.
Redirects users to aweb-based login pagebefore granting access.
Used inpublic hotspots, campus Wi-Fi, and enterprise guest networks.
Why These Assignments Are Correct?
1##802.1X for PC:
PCs support 802.1X authentication via supplicants (EAP-MD5, PEAP, etc.).
Ensureshigh security by verifying user credentials.
2##MAC Address Authentication for IP Phone:
IP Phones lack a username/password interface, so authentication is done via MAC addresses.
Simplifies authentication while maintaining security.
3##Portal Authentication for Wireless Clients:
Wireless users do not use 802.1X authentication directly; instead, they are redirected to a web login page.
Common in enterprise guest Wi-Fi and public hotspots.
Real-World Application:
Enterprise NAC Deployment:Ensuresonly authorized users and devices access the corporate network.
Campus & Hotel Wi-Fi Security:UsesPortal Authentication for guests, 802.1X for employees, and MAC- based for VoIP.
#Reference:Huawei HCIE-Datacom Guide - NAC Authentication Methods & Best Practices
NEW QUESTION # 136
The following description of the process of sending and receiving data frames in switch interface Access mode is correct? ( Single choice questions).
Answer: D
NEW QUESTION # 137
Which of the following inter-AS MPLS L3VPN solutions needsASBRs to transmit VPNv4 routes?
Answer: A
Explanation:
Comprehensive and Detailed Explanation:
Inter-AS MPLS L3VPN Option BrequiresASBRs to exchange VPNv4 routesusingeBGPwith label information.
Analysis of Inter-AS VPN Solutions:
Option B uses eBGP to exchange labeled VPNv4 routes between ASBRs but does not require MPLS between ASBRs.
Option A does not exchange VPNv4 routes over ASBRs (uses IP routing instead).
Option C uses MP-BGP and requires full MPLS between ASBRs.
Since Option B requires ASBRs to exchange VPNv4 routes, the correct answer is B.
#Reference: Huawei HCIE Datacom - MPLS Inter-AS VPNs
NEW QUESTION # 138
K company has two types of network services: UDP-based real-time video streaming services and TCP-based FTP download services. The company's network administrator often receives complaints that the FTP download speed is slow or unstable. What are the possible causes?
Answer: B,D
Explanation:
Comprehensive and Detailed
Key Factors Affecting FTP Performance:
Tail Drop and TCP Synchronization (A) ✅
Tail Drop causes TCP global synchronization, reducing FTP speeds drastically when congestion occurs.
Since FTP is TCP-based, packet loss due to tail drop forces TCP retransmissions, further degrading performance.
Priority Preemption by Video Traffic (D) ✅
UDP-based real-time video traffic is often prioritized over TCP-based traffic to avoid jitter and packet loss.
If video traffic has higher QoS priority, FTP bandwidth may be preempted, leading to slow speeds.
Incorrect Options:
❌ Option B: PQ scheduling typically prioritizes latency-sensitive traffic (VoIP), but this scenario does not mention priority queuing for FTP.
❌ Option C: No information about an explicit rate limit on FTP traffic.
📖 Reference: Huawei HCIE Datacom - QoS and Congestion Control
NEW QUESTION # 139
......
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