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Huawei HCIE-Datacom V1.0 Sample Questions (Q139-Q144):

NEW QUESTION # 139
WRED is configured on the newly deployed router HW The following description of the WRED feature is correct as ?( Multiple select).

A. WRED can set different drop thresholds and packet loss rates for packets of different priority
B. When traffic exceeds the minimum threshold, WRED starts dropping all ingress traffic (tail drops).
C. Avoid global synchronization by selectively dropping multiple TCP streams Low-bandwidth traffic is easier to drop than high-bandwidth traffic

Answer: A,C

NEW QUESTION # 140
Which of the following statements are correct about the authentication protocols used in Portal authentication?

A. When HTTP or HTTPS is used as the authentication protocol, the client needs to send authentication information to the access device, which then sends the information to the authentication server for identity authentication.
B. When Portal is used as the authentication protocol, the Portal server needs to exchange authentication information with the access device, which then sends the information to the authentication server for identity authentication.
C. When HTTP or HTTPS is used as the authentication protocol, none of the devices involved in the authentication process need to support the Portal protocol.
D. When Portal is used as the authentication protocol, the Portal server and access device only need to support the Portal protocol, but not the HTTP and HTTPS protocols.

Answer: A,B

Explanation:
Comprehensive and Detailed
✔ Portal authentication is a web-based authentication mechanism used in campus networks to control user access.
✔ Correct Statements:
✅ (A) The Portal server exchanges authentication details with the access device, which forwards them to the authentication server.
✅ (D) When using HTTP/HTTPS authentication, the client must send authentication credentials to the access device, which then forwards them to the authentication server.
✔ Incorrect Statements:
❌ (B) HTTP/HTTPS support is mandatory for web-based authentication.
❌ (C) If HTTP/HTTPS is used, Portal authentication may still be required.
📖 Reference: Huawei HCIE Datacom - Portal Authentication Mechanism

NEW QUESTION # 141
The correct description of configuring BGP4+ is that

A. BGP4+ does not support route reflectors.
B. BGP4+? Router-ID ? BGP4 ? Router-ID-??
C. BGP4 configures the reflector, the role positioning of the reflector and the client needs to be consistent with the configuration of BGP4
D. BGP4 specifies p
E. The next hop of a BGP4 route can use the Link-Local address.

Answer: B,E

NEW QUESTION # 142
Which of the following options is correct?

A. Multicast technology is able to reduce redundant traffic, so network bandwidth can be saved C.
Multicast technology is used for "-to-many" applications
B. Since multicast is based on TCP to establish a connection, multicast technology can ensure the reliable transmission of data
C. Unicast and broadcasting cannot effectively achieve data transmission between one source and multiple destinations on P2MP, but multicast technology can

Answer: A,B

NEW QUESTION # 143
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. DHCP Snooping + DAI
B. DAI + IPSG
C. DHCP Snooping + IPSG
D. DAI + Port Security

Answer: C

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 # 144
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