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| Section | Weight | Objectives |
|---|---|---|
| Ethernet Technology Basics | 20% | - VLAN principles and configuration - STP / RSTP / MSTP spanning tree protocols - MAC address table and forwarding - Link aggregation (LACP) - Ethernet overview and frame structure - VLAN intercommunication (sub-interface, VLANIF) |
| WLAN Technology Basics | 10% | - WLAN RF fundamentals (channels, bands) - WLAN networking architecture (AC + AP) - WLAN basic configuration and troubleshooting - WLAN overview and 802.11 standards |
| IP Technology Basics | 25% | - IPv4 addressing and subnetting - DHCP principles and configuration - NAT (Network Address Translation) - ACL (Access Control List) - OSPF fundamentals (single-area) - ICMP protocol - Static routing and default routing - IPv6 basics and address types |
| Typical Campus Networking Solution | 5% | - Typical campus network deployment scenarios - Hierarchical network model (core, aggregation, access) - Campus network architecture design - Network reliability and redundancy design |
| Network Security and Services | 15% | - AAA (Authentication, Authorization, Accounting) - IPsec VPN fundamentals - Firewall basics and security zones - Network management protocols (SNMP, NTP) - FTP / TFTP and file management - Network security overview |
| Network O&M and Troubleshooting | 10% | - Troubleshooting methodology and process - Network documentation and baselining - Network maintenance tools (ping, tracert, display commands) - Common network fault diagnosis |
| Data Communication Network Basics | 10% | - Basic principles and operations of VRP (Versatile Routing Platform) - Basic concepts and life cycle of campus network - ARP principles - OSI and TCP/IP protocol models and functions of each layer - Basic network concepts, IP network architecture, and standardization organizations - TCP/UDP principles - Data forwarding process |
| Data Center Network Basics | 5% | - Data center fabric concepts (VXLAN, SDN) - Data center network architecture overview - Cloud computing and virtualization basics |
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NEW QUESTION # 74
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. Option C , channel, is not a carrier parameter modified during modulation. A channel refers to a frequency resource or spectrum allocation used for communication, not a physical waveform characteristic being directly altered to encode bits. HCIA-Datacom introduces these basic wireless concepts to help learners understand how WLAN signals are transmitted, how data rate improvements are achieved, and why different modulation methods have different requirements for signal quality and interference resistance.
NEW QUESTION # 75
The figure shows the simplified topology of an enterprise campus network. On this network, the aging time of dynamic MAC address entries on switches is 300 seconds.
The administrator connects PC1 to GE1/0/1 of SW1 and successfully pings the IP address of PC2 from PC1.
Then, the administrator disconnects the Ethernet cable of PC1
from GE1/0/1 of SW1, immediately connects the cable to GE1/0/2 of SW1, and pings the IP address of PC2 from PC1. Which of the following operations does SW1 perform after receiving a data frame from PC1 when PC1 is connected to GE1/0/2 of SW1?
Answer: C
Explanation:
An Ethernet switch learns MAC address entries dynamically by examining the source MAC address of incoming frames. When SW1 first receives frames from PC1 on GE1/0/1, it creates a MAC address table entry mapping PC1's MAC address to that port. If PC1 later sends frames that arrive on GE1/0/2, SW1 updates the learned entry to reflect the new incoming interface. Therefore, option B is correct: SW1 saves the mapping between PC1's MAC address and GE1/0/2 and removes or overwrites the old mapping associated with GE1/0/1.
Option A is incorrect because a single dynamic MAC address is not normally maintained on two different ports within the same VLAN at the same time; that would cause forwarding ambiguity. Option C is incorrect because a normal move of one MAC address does not require clearing the entire MAC table. Option D is also incorrect because switches update MAC learning dynamically upon receiving new source traffic and do not have to wait for the previous entry to age out. HCIA-Datacom uses this principle to explain MAC address learning, migration, and troubleshooting of loops or host movement in switched Ethernet networks.
NEW QUESTION # 76
Which of the following is correct regarding the configuration of the trunk port and access port on a switch?
Answer: B
Explanation:
Access ports are configured for a single VLAN and thus send untagged frames by default. Trunk ports, conversely, handle traffic for multiple VLANs, tagging each frame with a VLAN ID.
NEW QUESTION # 77
Which of the following variables defined in Python code is invalid?
Answer: A
Explanation:
In Python, variable names must follow identifier rules: they cannot start with a digit. The variable
2_r1 is invalid because it begins with the number 2, which violates Python naming conventions.
The other variables are valid because they either start with letters or underscores and follow proper identifier rules.
NEW QUESTION # 78
On the network shown in the figure, GE1/0/1 and GE1/0/2 of SW1 are access interfaces, and their PVIDs are VLAN 2 and VLAN 3 respectively. GE1/0/1 of SW2 is also an access interface, and its PVID is VLAN 4. Which of the following configurations on SW1 and SW2 can ensure that data packets sent from PC1 and PC2 can reach PC3?
Answer: A,C
Explanation:
PC1 and PC2 are in different VLANs on SW1, while PC3 is in VLAN 4 on SW2. To allow traffic from VLAN 2 and VLAN 3 users to reach PC3 through the inter-switch link, SW1 must be able to send frames from PC1 and PC2 toward SW2 in a form that SW2 can place into VLAN 4.
Option B is valid because a hybrid interface on SW1 can send frames from VLAN 2 and VLAN 3 untagged, and setting the PVID to VLAN 4 allows untagged inbound frames on the peer side to be associated appropriately when matched with the SW2 configuration. Option C is also valid because configuring SW2's GE1/0/3 as a trunk allowing VLAN 4 and setting its PVID to VLAN 4 means untagged frames arriving from SW1 are treated as belonging to VLAN 4 and can then be forwarded to PC3 through its access interface.
NEW QUESTION # 79
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