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| Section | Weight | Objectives |
|---|---|---|
| Network Security and Services | 15% | - Network management protocols (SNMP, NTP) - AAA (Authentication, Authorization, Accounting) - Network security overview - IPsec VPN fundamentals - FTP / TFTP and file management - Firewall basics and security zones |
| Typical Campus Networking Solution | 5% | - Hierarchical network model (core, aggregation, access) - Campus network architecture design - Typical campus network deployment scenarios - Network reliability and redundancy design |
| Ethernet Technology Basics | 20% | - Ethernet overview and frame structure - Link aggregation (LACP) - VLAN principles and configuration - MAC address table and forwarding - STP / RSTP / MSTP spanning tree protocols - VLAN intercommunication (sub-interface, VLANIF) |
| Data Center Network Basics | 5% | - Data center fabric concepts (VXLAN, SDN) - Cloud computing and virtualization basics - Data center network architecture overview |
| WLAN Technology Basics | 10% | - WLAN overview and 802.11 standards - WLAN basic configuration and troubleshooting - WLAN networking architecture (AC + AP) - WLAN RF fundamentals (channels, bands) |
| Data Communication Network Basics | 10% | - OSI and TCP/IP protocol models and functions of each layer - Data forwarding process - Basic network concepts, IP network architecture, and standardization organizations - Basic concepts and life cycle of campus network - ARP principles - TCP/UDP principles - Basic principles and operations of VRP (Versatile Routing Platform) |
| Network O&M and Troubleshooting | 10% | - Network documentation and baselining - Network maintenance tools (ping, tracert, display commands) - Common network fault diagnosis - Troubleshooting methodology and process |
| IP Technology Basics | 25% | - NAT (Network Address Translation) - Static routing and default routing - ICMP protocol - ACL (Access Control List) - DHCP principles and configuration - OSPF fundamentals (single-area) - IPv6 basics and address types - IPv4 addressing and subnetting |
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NEW QUESTION # 82
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: C
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 # 83
Which of the following hosts are reachable to the host at 192.168.1.200/27 at Layer 2? (Select all that apply)
Answer: A,B,C
Explanation:
A /27 subnet mask is 255.255.255.224, which means each subnet contains 32 IP addresses. The subnet increments in blocks of 32 in the last octet: 0, 32, 64, 96, 128, 160, 192, 224. The address
192.168.1.200/27 belongs to the subnet 192.168.1.192/27.
For this subnet, the network address is 192.168.1.192, the broadcast address is 192.168.1.223, and the valid host range is from 192.168.1.193 to 192.168.1.222. Therefore, 192.168.1.221/27,
192.168.1.193/27, and 192.168.1.222/27 are all valid host addresses in the same subnet and are reachable at Layer 2 without routing. That makes A, C, and D correct.
NEW QUESTION # 84
Which of the following statements are true about the Python code shown below? (Select all that apply) import paramiko import time ssh = paramiko.SSHClient() ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) ssh.connect( ' 192.168.1.254 ' , username= ' python ' , password= ' Huawei@123 ' ) channel = ssh.invoke_shell() channel.send( ' screen-length 0 temporary\n ' ) time.sleep(1) output = channel.recv(65535).decode( ' utf-8 ' ) print(output) ssh.close()
Answer: A,B,C,D
Explanation:
All four statements are correct. The code uses the Paramiko library to automate SSH login to a network device. import paramiko and import time load the Python modules required for SSH communication and delay control, so option C is correct. The statement ssh = paramiko.SSHClient() creates an SSH client object, and ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) allows the client to accept an unknown host key automatically in this example scenario.
The command ssh.connect( ' 192.168.1.254 ' , username= ' python ' , password= ' Huawei@123 ' ) establishes an SSH connection to the target device, so option B is correct. Then channel = ssh.invoke_shell() opens an interactive shell channel , which is commonly used to send CLI commands and receive output just as an administrator would in a terminal session, making option D correct. The command channel.send( ' screen- length 0 temporary\n ' ) disables page-by-page output for the current session, which is useful in network automation. Finally, ssh.close() closes the SSH session and releases the connection, so option A is correct.
HCIA-Datacom automation knowledge often uses Paramiko examples to demonstrate basic Python-based device O & M.
NEW QUESTION # 85
Which of the following statements regarding static routing and dynamic routing is incorrect?
Answer: C
Explanation:
Static routing does not automatically recover from link failures; manual reconfiguration is required if a static route path becomes invalid. Dynamic routing protocols, on the other hand, adapt automatically to network changes, adjusting routes as needed.
NEW QUESTION # 86
On the switched network shown in the figure, STP is enabled on all devices. SW1 is the root bridge. The port costs are shown in the figure. Other parameters retain the default values. After the network is stable, which of the following paths is used by SW1 to send traffic to SW4?
Answer: A
Explanation:
After STP convergence, only ports in the forwarding state participate in active traffic forwarding, while redundant ports may be placed into the blocking or discarding state to eliminate loops. According to the topology and STP role election shown in the question, the valid forwarding path from SW1 to SW4 is SW1 # SW3 # SW4, so option B is correct.
This means that the direct alternative path or the path through SW2 is not the active spanning-tree forwarding path after election and state transition. STP selects paths based on the root bridge, path cost, bridge ID, and port ID. Once the root bridge and port roles are determined, some links remain active and others are blocked to ensure a loop-free Layer 2 topology. HCIA-Datacom emphasizes that the resulting forwarding topology is a tree, not a mesh, even if the physical topology contains redundant links. Understanding the actual forwarding path after STP convergence is important for troubleshooting connectivity, predicting traffic behavior, and verifying whether bridge priority and path-cost settings have produced the intended design outcome in campus switching networks.
NEW QUESTION # 87
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