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| Section | Weight | Objectives |
|---|---|---|
| WLAN Technology Basics | 10% | - WLAN basic configuration and troubleshooting - WLAN networking architecture (AC + AP) - WLAN overview and 802.11 standards - WLAN RF fundamentals (channels, bands) |
| Data Communication Network Basics | 10% | - TCP/UDP principles - ARP principles - Data forwarding process - OSI and TCP/IP protocol models and functions of each layer - Basic principles and operations of VRP (Versatile Routing Platform) - Basic concepts and life cycle of campus network - Basic network concepts, IP network architecture, and standardization organizations |
| Network Security and Services | 15% | - Network security overview - FTP / TFTP and file management - IPsec VPN fundamentals - Network management protocols (SNMP, NTP) - Firewall basics and security zones - AAA (Authentication, Authorization, Accounting) |
| IP Technology Basics | 25% | - IPv4 addressing and subnetting - Static routing and default routing - OSPF fundamentals (single-area) - DHCP principles and configuration - NAT (Network Address Translation) - ACL (Access Control List) - ICMP protocol - IPv6 basics and address types |
| Data Center Network Basics | 5% | - Cloud computing and virtualization basics - Data center fabric concepts (VXLAN, SDN) - Data center network architecture overview |
| Ethernet Technology Basics | 20% | - VLAN intercommunication (sub-interface, VLANIF) - STP / RSTP / MSTP spanning tree protocols - Ethernet overview and frame structure - MAC address table and forwarding - Link aggregation (LACP) - VLAN principles and configuration |
| Typical Campus Networking Solution | 5% | - Network reliability and redundancy design - Campus network architecture design - Typical campus network deployment scenarios - Hierarchical network model (core, aggregation, access) |
| Network O&M and Troubleshooting | 10% | - Troubleshooting methodology and process - Network maintenance tools (ping, tracert, display commands) - Network documentation and baselining - Common network fault diagnosis |
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NEW QUESTION # 16
Which of the following descriptions regarding the TTL field of the IP packet is correct?
Answer: A
NEW QUESTION # 17
There are two Ethernet frame formats: Ethernet_II and IEEE 802.3. The Ethernet_II frame format uses the Type field to determine the upper-layer protocol type, and the IEEE 802.3 frame format uses the Tag field to determine the upper-layer protocol type.
Answer: A
Explanation:
Ethernet II frames use the Type field to indicate the upper-layer protocol, while IEEE 802.3 frames use the Length field (not a Tag field) to distinguish frame length. The protocol type in IEEE
802.3 is determined by the LLC/SNAP layer above the frame, not by a Tag field.
NEW QUESTION # 18
Enabling STP and configuring the core device as the root bridge is recommended, even if no physical loop exists on the switched network. This prevents Layer 2 loops caused by incorrect connections between devices and avoids network reconvergence caused by root bridge preemption.
Answer: B
Explanation:
Enabling STP (Spanning Tree Protocol) and configuring a core switch as the root bridge is a best practice in Layer 2 network design, even when no physical loop currently exists. It helps prevent potential loops caused by miswiring or topology changes and ensures stable topology control by avoiding unexpected root bridge elections or preemption events that could trigger reconvergence.
NEW QUESTION # 19
With the development of data centers, a large number of services are deployed on virtual machines (VMs). The original VLAN isolation solution cannot achieve isolation between so many VMs. VXLAN uses VXLAN Network Identifiers (VNIs) to provide a larger range than VLAN IDs, so that a larger number of VMs can be isolated.
Answer: B
Explanation:
This statement is true. Traditional VLANs use a 12-bit VLAN ID, which means that only about
4094 usable VLANs are available. In modern data centers, especially in cloud and virtualization environments, that scale is often insufficient because a very large number of tenants, services, and virtual machines need isolated network segments.
VXLAN addresses this limitation by introducing the VNI (VXLAN Network Identifier), which is 24 bits long. This allows support for up to about 16 million logical segments, greatly expanding the number of isolated Layer 2 networks that can be created across an IP underlay. Because of this, VXLAN is widely used in modern data centers to provide scalable tenant isolation, flexible service deployment, and large Layer 2 extension across physical boundaries. HCIA-Datacom highlights VXLAN as a key overlay technology that solves the VLAN scale problem in virtualized data center environments. It allows a much larger number of VMs and tenants to be isolated than traditional VLAN-based solutions can support, making it essential for modern cloud-oriented and large-scale data center networking.
NEW QUESTION # 20
On a campus network, if two switches are directly connected through three physical links, you can configure either STP or link aggregation to improve network reliability. These two functions are mutually exclusive, meaning only one of them can be configured on a device at a time.
Answer: A
Explanation:
STP and link aggregation are not mutually exclusive technologies. They solve different problems and can coexist on the same switch. Link aggregation combines multiple physical Ethernet links into a logical Eth- Trunk, increasing available bandwidth and providing member-link redundancy. STP or a related spanning-tree protocol prevents Layer 2 loops by calculating a loop-free active topology and can treat an Eth-Trunk as a logical interface. In a well-designed campus network, several physical links between two switches may first be aggregated into one Eth-Trunk, while STP operates over that logical link together with other Layer 2 paths.
Conversely, if separate redundant links are not aggregated, STP may block one or more paths to prevent a loop. Choosing link aggregation can use parallel member links more efficiently than allowing STP to block individual links, but enabling one function does not prohibit use of the other elsewhere on the device.
Therefore, the assertion that only STP or link aggregation can be configured on a device at one time is incorrect. The verified answer is FALSE, option B.
NEW QUESTION # 21
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