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| Section | Objectives |
|---|---|
| Topic 1: Network Fundamentals | - OSI and TCP/IP models - Basic network topologies and devices |
| Topic 2: Network Security Basics | - Basic network security concepts - Access control lists (ACL) |
| Topic 3: Routing Technologies | - Dynamic routing fundamentals (OSPF basics) - Static routing |
| Topic 4: WLAN Basics | - Wireless networking fundamentals |
| Topic 5: Switching Technologies | - STP/RSTP concepts - VLAN configuration and trunking |
| Topic 6: IP Services | - DHCP and DNS concepts - NAT basics |
| Topic 7: Network Management and Troubleshooting | - Basic troubleshooting tools and methods - Device management concepts |
| Topic 8: IP Addressing and Subnetting | - IPv4 addressing and subnet masks - IPv6 fundamentals |
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NEW QUESTION # 29
In a wireless communication system, information is first converted into digital signals for easy circuit calculation and processing by the transmitter through source coding, and then converted into radio waves through channel coding and modulation. Which of the following parameters of a carrier are modified during the modulation process based on signal changes? (Select all that apply)
Answer: A,C,D
Explanation:
During modulation, the transmitter maps digital information onto certain physical characteristics of a carrier signal so that the information can be transmitted over the air. The three classic carrier parameters that can be modified are amplitude, frequency, and phase. Therefore, options A, B, and D are correct.
Amplitude modulation changes the strength of the carrier wave. Frequency modulation changes the oscillation rate of the carrier. Phase modulation changes the phase angle of the carrier relative to a reference. Modern wireless communication systems often combine these parameters, especially amplitude and phase, in complex digital modulation schemes such as QPSK, 16-QAM, 64-QAM, or higher-order QAM used in WLAN standards.
NEW QUESTION # 30
On a campus network, SW1, an access switch, has 24 downlink Interfaces, all of which belong to VLAN 1 by default. The administrator adds interfaces 1 to 8 of SW1 to VLAN 2 and interfaces 9 to
16 to VLAN 3, and retains the default VLAN for other interfaces. In this case, all downstream devices connected to SW1 belong to the same broadcast domain.
Answer: B
Explanation:
VLANs define separate broadcast domains. In this case, interfaces are divided into VLAN 1, VLAN 2, and VLAN 3, so downstream devices connected to SW1 are distributed across multiple VLANs. Devices in different VLANs belong to different broadcast domains, meaning the entire switch does not form a single broadcast domain.
NEW QUESTION # 31
When a Huawei network device functions as an FTP server, which of the following are possible causes of an FTP client failing to log in to the FTP server? (Select all that apply)
Answer: A,B,C,D
Explanation:
All four options are possible causes of FTP login failure, so the correct answer is A, B, C, and D.
Option A is correct because if the FTP server function is not enabled on the Huawei device, the device cannot provide FTP services and the client cannot log in. Option B is also correct because if the authorized directory is not specified for the FTP user, the user may not be able to complete login or access file services properly, depending on the FTP user configuration requirements.
Option C is correct because an FTP user account must be configured with the required username and password; otherwise, authentication cannot succeed. Option D is also correct because if the network between the FTP client and the device is unreachable, the client cannot establish the FTP connection at all.
In HCIA-Datacom troubleshooting, FTP login failure is usually checked from four aspects: service enablement, user configuration, permission or directory authorization, and network connectivity.
This question tests standard remote maintenance troubleshooting logic for file transfer services on Huawei network devices.
NEW QUESTION # 32
RSTP uses the proposal/agreement mechanism to shorten the time that an upstream port waits before transitioning to the Forwarding state, but no temporary loop occurs. Why?
Answer: B
Explanation:
RSTP (Rapid Spanning Tree Protocol) employs a synchronization mechanism with the proposal/agreement handshakes to prevent loops during topology changes. By synchronizing states between switches, RSTP avoids temporary loops while quickly transitioning ports to the forwarding state.
NEW QUESTION # 33
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: B
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 # 34
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