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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Security and Services | 15% | - ACL, NAT principles and configuration - AAA and basic security technologies - DHCP, DNS, FTP, Telnet services |
| Topic 2: Typical Campus Networking Solution | 5% | - End-to-end networking scenarios - Campus network design and integration |
| Topic 3: Network O&M and Troubleshooting | 10% | - Network monitoring and management tools - Fault diagnosis and troubleshooting methods |
| Topic 4: Ethernet Technology Basics | 20% | - VLAN, STP, RSTP principles and configuration - Ethernet standards and switch principles - Link aggregation and stacking technologies |
| Topic 5: WLAN Technology Basics | 10% | - WLAN architecture and working principles - 802.11 standards and WLAN components - Basic WLAN configuration |
| Topic 6: Data Communication Network Basics | 10% | - VRP system basics and operations - Campus network basics - ARP, TCP/UDP principles - Basic network concepts and architecture - OSI and TCP/IP protocol models - Data forwarding process |
| Topic 7: Data Center Network Basics | 5% | - Basic data center networking technologies - Data center architecture overview |
| Topic 8: IP Technology Basics | 25% | - Static routing, OSPF fundamentals - IPv6 basics - IPv4 addressing, subnetting - IP routing basics and forwarding |
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NEW QUESTION # 127
Secure Shell (SSH) is a protocol that uses encryption and authentication mechanisms to implement network services, such as secure access and file transfer, securely over an insecure network. Which of the following protocols use SSH? (Select all that apply)
Answer: A,B,C
Explanation:
Several upper-layer management and file transfer protocols use SSH as their secure transport foundation.
SFTP is the SSH File Transfer Protocol and operates over SSH, making option C correct. STelnet is secure Telnet implemented over SSH, so option D is also correct. NETCONF commonly uses SSH as its transport protocol for secure configuration management and device orchestration, making option B correct as well.
Option A, DNS, does not use SSH as its normal transport protocol. Traditional DNS operates over UDP or TCP port 53, depending on the query or transfer type. Although DNS security extensions and encrypted DNS variants exist, they are not based on SSH. HCIA-Datacom emphasizes the role of SSH in secure network management because it replaces insecure plaintext protocols and provides confidentiality, integrity, and authentication. In practical Huawei enterprise deployments, SSH-based protocols are widely used for interactive device login, automated configuration delivery, and secure file operations. This question tests recognition of management protocols that inherit SSH's secure channel rather than protocols that operate independently at the application layer.
NEW QUESTION # 128
In the figure, both PC1 and PC2 belong to VLAN 10. Interface GE1/0/1 on SW1 is a trunk interface with the default PVID, and interface GE1/0/2 on SW1 is an access interface in VLAN 10. Which of the following statements are true about the forwarding of data frames between PC1 and PC2? (Select all that apply)
Answer: B,D
Explanation:
When a switch receives an untagged frame from a user host on an access interface, it associates that frame with the VLAN configured on the interface. In this scenario, PC1 and PC2 are in VLAN 10, and GE1/0/2 is an access interface in VLAN 10. After SW1 receives the frame from PC1, it internally associates the frame with VLAN 10, so option A is correct in the practical VLAN-processing sense used in HCIA-Datacom questions.
When the frame is forwarded out an access interface toward PC2, the switch sends it without a VLAN tag, because end hosts normally do not process 802.1Q tags. Therefore, option D is correct. Option B is incorrect because both hosts are in the same VLAN and can communicate normally; SW1 does not discard the return traffic for that reason. Option C is not correct in the standard VLAN switching model used by Huawei training, because the switch performs forwarding based on VLAN membership and internally processes the frame as belonging to VLAN 10. This question mainly checks understanding of access/trunk behavior and tag handling on ingress and egress.
NEW QUESTION # 129
PC1 at 192.168.1.1/24 and PC2 at 192.168.1.102/25 are directly connected using an Ethernet cable, and the physical status of their network ports are normal. They can directly communicate with each other although their masks are different.
Answer: B
Explanation:
Although the two PCs are physically connected and the link status is normal, IP communication requires both devices to be in the same logical subnet to communicate directly without a router.
PC1 uses 192.168.1.1/24, while PC2 uses 192.168.1.102/25, which places them in different subnet boundaries. Because their subnet masks differ, they are not in the same Layer 3 network, so direct communication is not guaranteed and generally not possible without routing or special configuration.
NEW QUESTION # 130
The rules in an ACL may overlap. If packets match the rules with loose conditions, the later ACL rules are not processed. In this case, packets cannot match the rules with strict conditions.
Therefore, the rules with strict conditions must be arranged in front lines and those with loose conditions must be arranged towards the end.
Answer: A
Explanation:
Access Control Lists (ACLs) are processed in sequential order, meaning that once a packet matches a rule, subsequent rules are ignored. To ensure that more specific (strict) conditions are applied, strict rules should be listed first, followed by loose rules.
NEW QUESTION # 131
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 # 132
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