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NEW QUESTION # 36
A web server and a DNS server are deployed on a network. When a user enters a website address on a client to access a web page, which of the following information does the DNS server return to the client?
Answer: A
Explanation:
When a user enters a website address, the DNS server resolves the domain name to its corresponding IP address. This IP address is then used by the client to locate and communicate with the web server hosting the requested website.
NEW QUESTION # 37
An enterprise has deployed a Huawei WLAN, but some STAs cannot associate with wireless signals. To troubleshoot this issue, you log in to the WAC and run related commands. The command output is as follows. According to the command output, which of the following is the possible cause of the STA association failure?
Answer: C
Explanation:
If you look closely at the column CU (Channel Utilization) for both radios of AP ID 0:
Radio 0 (2.4G band): The CU is at 90%.
Radio 1 (5G band): The CU is at 13%.
A channel utilization of 90% on the 2.4G radio indicates severe congestion and heavy wireless interference. When the air interface is that busy, stations (STAs) attempting to connect will suffer from massive packet loss, timeouts, and a general inability to complete the association handshake.
NEW QUESTION # 38
OSPF supports the division of a network into areas, each identified by an area ID that ranges from 0 to 255. Area 0 is designated as the backbone area.
Answer: A
Explanation:
This statement is false because although Area 0 is indeed the backbone area, the statement about the area ID range is incorrect. In OSPF, the area ID is a 32-bit value, which can be represented either in decimal format or in IPv4 address format such as 0.0.0.0. It is not limited to the numeric range 0 to 255.
For example, an area can be configured as 0, 1, 100, or in dotted-decimal form such as 0.0.0.1 or
0.0.0.10, depending on implementation and configuration style. HCIA-Datacom teaches that OSPF uses hierarchical area design to improve scalability, reduce SPF calculation scope, and optimize LSA flooding. The backbone area, which is Area 0, serves as the transit area connecting all non-backbone areas in a standard OSPF design. Therefore, the second part of the statement is correct, but the first part is wrong, making the entire statement false. This question tests whether the learner understands both the function of Area 0 and the actual format of OSPF area identifiers.
NEW QUESTION # 39
The undo command can be used in the CLI of a Huawei device to restore default settings, disable functions, or delete configurations. Which of the following are correct undo commands? (Select all that apply)
Answer: A,C,D
Explanation:
On Huawei devices, the undo command is used to remove a previously applied configuration, disable a function, or restore a parameter to its default state. In option B, undo ip address is a valid interface-view command that removes the IP address configured on the interface. In option C, undo portswitch is also a valid interface command on switch interfaces that converts a Layer 2 interface into a Layer 3 interface when supported by the device. In option D, undo sysname restores the device name to the default hostname, which is valid in system view.
NEW QUESTION # 40
Which of the following commands can be used to check OSPF routes in the global routing table?
Answer: B
Explanation:
To check OSPF-learned routes in the global IP routing table, the correct command is display ip routing-table protocol ospf, so option A is correct. This command filters the routing table and shows only the routes whose source protocol is OSPF. It is especially useful when verifying whether OSPF-learned routes have been successfully installed into the forwarding table after neighbor establishment and LSDB calculation.
NEW QUESTION # 41
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