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| Section | Weight | Objectives |
|---|---|---|
| Network Security and Services | 15% | - DHCP, DNS, FTP, Telnet services - ACL, NAT principles and configuration - AAA and basic security technologies |
| Typical Campus Networking Solution | 5% | - End-to-end networking scenarios - Campus network design and integration |
| Data Center Network Basics | 5% | - Data center architecture overview - Basic data center networking technologies |
| Data Communication Network Basics | 10% | - ARP, TCP/UDP principles - OSI and TCP/IP protocol models - VRP system basics and operations - Basic network concepts and architecture - Data forwarding process - Campus network basics |
| WLAN Technology Basics | 10% | - WLAN architecture and working principles - 802.11 standards and WLAN components - Basic WLAN configuration |
| Ethernet Technology Basics | 20% | - Ethernet standards and switch principles - Link aggregation and stacking technologies - VLAN, STP, RSTP principles and configuration |
| IP Technology Basics | 25% | - IPv4 addressing, subnetting - IP routing basics and forwarding - Static routing, OSPF fundamentals - IPv6 basics |
| Network O&M and Troubleshooting | 10% | - Fault diagnosis and troubleshooting methods - Network monitoring and management tools |
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NEW QUESTION # 83
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 # 84
On the network shown in the figure, all switches run STP. All links have a path cost of 20, and SW1 is the root bridge. What is the root path cost (RPC) of SW4?
Answer: D
Explanation:
The root path cost (RPC) of a switch is the total path cost from that switch to the root bridge along the selected spanning-tree path. Since SW1 is given as the root bridge, its RPC is 0. Each link in the topology has a path cost of 20 . To determine SW4's RPC, you identify the shortest active STP path from SW4 to SW1.
Based on the topology used in the question, SW4 reaches SW1 through a path containing two links .
Therefore, the total root path cost is 20 + 20 = 40 , which makes option B correct. This is a standard STP calculation. HCIA-Datacom uses RPC as one of the main comparison parameters in root-port election on non- root switches. A lower RPC means a better path toward the root bridge. If multiple candidate ports have the same RPC, the switch then compares the sender's bridge ID and port ID. This question checks whether the learner understands that RPC is cumulative across the spanning-tree forwarding path and is not simply the cost of a single directly connected link unless the switch is directly attached to the root bridge.
NEW QUESTION # 85
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 # 86
In the figure, a TCP connection has been established between PC1 and PC2. After PC1 sends a data segment to PC2, which of the following is the acknowledgment number in the packet returned by PC2?
Answer: D
Explanation:
In TCP, the acknowledgment number indicates the next byte that the receiver expects to receive. In the figure, PC1 sends a TCP segment to PC2 with sequence number = a+22 and payload length = 22 bytes .
Since TCP sequence numbers count bytes, the last byte carried in this segment corresponds to sequence number a+43 . Therefore, after PC2 successfully receives this data, it sends back an ACK indicating that the next expected byte is a+44 .
That is why option B is correct. This is a standard TCP reliability mechanism. TCP does not acknowledge
"packets" as units; it acknowledges the byte stream. The ACK number always points to the next byte expected from the peer. The source and destination port numbers identify the session, but the sequence and acknowledgment numbers track ordered delivery. HCIA-Datacom uses this mechanism to explain connection- oriented transport, reliable delivery, retransmission, and traffic control. Understanding how the payload length affects sequence progression is essential when analyzing packet captures and troubleshooting TCP communication problems in enterprise networks.
NEW QUESTION # 87
The MAC address table of SW1 is shown in the figure. If SW1 receives a data frame with the destination MAC address 0050-5600-0004 from PC1, which of the following operations does SW1 perform on the data frame?
Answer: C
Explanation:
SW1 looks up the destination MAC address 0050-5600-0004 in its MAC address table and finds it associated with interface GE1/0/4. Since this is a known unicast entry, the switch forwards the frame only out of the corresponding port instead of flooding it to all ports.
NEW QUESTION # 88
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