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NEW QUESTION # 138
On a switched network where STP is enabled on all devices, when a downstream device detects a topology change, it continuously sends configuration BPDUs to the upstream device until the root bridge is informed of the topology change.
Answer: A
Explanation:
In STP, topology change information is propagated via TCN (Topology Change Notification) BPDUs, not by continuously sending configuration BPDUs. When a change is detected, the switch sends TCN BPDUs toward the root bridge through the upstream path, and the root bridge then informs the network using configuration BPDUs with updated flags. The behavior described is therefore incorrect.
NEW QUESTION # 139
The domain to which a user belongs is determined by the user name used by the user to log in to the NAS device. If the domain name carried in the user name is not configured on the NAS device, the authentication fails.
Answer: A
Explanation:
This statement is false . On Huawei devices, the domain to which a user belongs is usually determined by the domain part carried in the user name, for example user@huawei.com. However, if the specified domain is not configured on the NAS device, authentication does not necessarily fail immediately . In many cases, the device can use a default domain for authentication processing, depending on the AAA configuration.
Huawei AAA supports both an administrator user default domain and a normal user default domain . If a user name does not match a configured domain, or the domain carried in the user name is unavailable, the device may fall back to the default domain and continue authentication according to the configured policy.
Therefore, the statement is incorrect because it treats authentication failure as unavoidable in every such case.
HCIA-Datacom emphasizes domain-based AAA processing because it allows different groups of users to use different authentication, authorization, and accounting methods. At the same time, learners must understand the function of default domains, which provide flexibility in real deployments and prevent unnecessary authentication failures in some login scenarios.
NEW QUESTION # 140
On the OSPF network shown in the figure, R1 has a route to 10.0.0.0/30, with the next hop being
30.1.1.2 by default.
Answer: B
Explanation:
The destination network 10.0.0.0/30 is directly connected to the right-side router (R3). From R1, there are two OSPF paths to reach R3: a direct link (cost 10) and an indirect path via the top router (cost 20). OSPF selects the lowest-cost path, which is the direct link to R3. Therefore, R1's next hop toward 10.0.0.0/30 is 30.1.1.2, making the statement correct.
NEW QUESTION # 141
The following command is configured on the VTY interfaces of R1:
[R1-ui-vty0-4] protocol inbound all
In this case, FTP, Telnet, and SSH users can all use the five VTY interfaces.
Answer: A
Explanation:
VTY interfaces provide remote terminal sessions to the device. The command protocol inbound all allows the interactive remote-login protocols supported by that VTY implementation, notably Telnet and SSH/STelnet.
FTP is not a VTY terminal-login protocol. FTP is a file-transfer service that uses its own server/client process, TCP sessions, authentication, and file system permissions; enabling FTP service does not make an FTP user consume a VTY terminal line in the same manner as a Telnet or SSH CLI session. Therefore, even though the word all broadens the VTY ' s permitted terminal access protocols, it does not mean that FTP users log in through those five VTY interfaces. Huawei troubleshooting documentation specifically treats protocol inbound all as satisfying Telnet and SSH access requirements. The statement incorrectly groups FTP with the VTY login protocols and claims that all three types of users can use the five VTY interfaces. That conclusion is false. The verified answer is B.
NEW QUESTION # 142
To prevent key services from being affected due to insufficient bandwidth of an Eth-Trunk when too many links are faulty, the administrator runs the least active-linknumber 4 command on an Eth-Trunk that has eight member interfaces to set the minimum number of active links to 4. Which of the following situations will cause the Eth-Trunk interface to go Down?
Answer: A,B,C,D
Explanation:
To achieve end-to-end Layer 2 connectivity across VLAN 2, VLAN 3, and VLAN 4, the inter- switch link must properly carry multiple VLANs, and SW2 must correctly handle VLAN 4 traffic toward PC3.
On SW1, both trunk and hybrid configurations that allow VLAN 2 and VLAN 3 are valid methods to ensure tagged VLAN traffic is transmitted across the link, and PVID adjustments ensure correct handling of untagged frames where required.
On SW2, both trunk and hybrid configurations that permit VLAN 4 ensure that PC3 receives its VLAN traffic correctly. Trunk mode carries VLAN 4 transparently, while hybrid mode can deliver VLAN 4 untagged depending on PVID settings.
Since all listed configurations correctly support VLAN propagation and inter-switch VLAN handling under Huawei switching behavior, all options are valid.
NEW QUESTION # 143
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