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| Section | Weight | Objectives |
|---|---|---|
| Ethernet Technology Basics | 20% | - VLAN, STP, RSTP principles and configuration - Ethernet standards and switch principles - Link aggregation and stacking technologies |
| Network O&M and Troubleshooting | 10% | - Network monitoring and management tools - Fault diagnosis and troubleshooting methods |
| Data Communication Network Basics | 10% | - Campus network basics - Data forwarding process - OSI and TCP/IP protocol models - Basic network concepts and architecture - ARP, TCP/UDP principles - VRP system basics and operations |
| WLAN Technology Basics | 10% | - Basic WLAN configuration - WLAN architecture and working principles - 802.11 standards and WLAN components |
| Network Security and Services | 15% | - AAA and basic security technologies - DHCP, DNS, FTP, Telnet services - ACL, NAT principles and configuration |
| IP Technology Basics | 25% | - IPv4 addressing, subnetting - IP routing basics and forwarding - IPv6 basics - Static routing, OSPF fundamentals |
| Data Center Network Basics | 5% | - Data center architecture overview - Basic data center networking technologies |
| Typical Campus Networking Solution | 5% | - End-to-end networking scenarios - Campus network design and integration |
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NEW QUESTION # 121
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,D
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 # 122
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.
Option B , display ospf peer, is used to check OSPF neighbor information and adjacency states, not the routing table. Option C , display ospf interface, shows OSPF-related parameters on interfaces such as timers, network type, and cost. Option D , display ospf routing, displays OSPF route information maintained by the OSPF process itself, but the question specifically asks about routes in the global routing table , which is the RIB used for actual forwarding decisions. HCIA-Datacom distinguishes between protocol-specific route information and the final routing table seen by the device. Understanding this distinction helps engineers verify whether a protocol has only learned topology information or has actually produced usable forwarding entries.
NEW QUESTION # 123
The administrator performs the configuration shown in the figure on SW1. After the network is stable, the administrator pings the IP address of PC2 from PC1. The connectivity is normal. Then, the administrator runs the undo vlan 10 command on SW1. After the network is stable, the administrator pings the IP address of PC2 from PC1 again. Which of the following statements are false about this scenario? (Select all that apply)
Answer: A,B,C
Explanation:
Initially, both PC1 and PC2 belong to VLAN 10 through their access interfaces. They therefore communicate within the same Layer 2 broadcast domain.
When VLAN 10 is deleted, the switch removes its associated VLAN membership, and the affected access interfaces revert to the default VLAN 1. Both PCs consequently remain in the same broadcast domain and can communicate.
Option A is true because PC1 can still reach PC2 after both ports return to VLAN 1.
Option B is false because the switch internally associates received frames with VLAN information during forwarding.
Option C is false because the switch can forward traffic in both directions.
Option D is false because the switch no longer assigns the deleted VLAN 10 to incoming frames.
Therefore, B, C, and D are false statements.
NEW QUESTION # 124
Four links between two switches establish an Eth-Trunk in manual mode, and the bandwidth of each link is 1 Gbit/s. One of the links fails. Which of the following statements are true about this scenario? (Select all that apply)
Answer: A,C
Explanation:
In an Eth-Trunk working in manual mode , multiple physical member links are bundled into one logical interface to provide higher bandwidth and link redundancy. If one of four 1 Gbit/s member links fails, the Eth- Trunk does not go down as long as at least one valid member link remains active. Therefore, statement A is correct. Since one link has failed and three member links remain available, the total available bandwidth becomes 3 Gbit/s , so statement B is also correct.
Statement C is incorrect because the traffic originally hashed to the failed link is not permanently stopped.
Instead, after the link failure is detected, traffic is redistributed across the remaining active member links according to the trunk load-balancing mechanism. Statement D is also incorrect because Eth-Trunk provides link-level redundancy. Existing upper-layer sessions such as TCP are not necessarily interrupted and re- established simply because one member link fails. HCIA-Datacom emphasizes that Eth-Trunk improves reliability and bandwidth utilization by allowing traffic to continue across surviving links when a single member fails. This is one of the main advantages of link aggregation in campus and data center switching networks.
NEW QUESTION # 125
What are the types of IPv6 extension headers? (Choose all that apply.)
Answer: A,B,C,D
Explanation:
IPv6 extension headers are used to provide optional network-layer information and are inserted between the IPv6 header and the upper-layer protocol. The standard extension headers include Hop-by-Hop Options, Routing, Fragment, and Destination Options headers, all of which are valid IPv6 extension header types used to extend functionality without modifying the base IPv6 header.
NEW QUESTION # 126
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