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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IP Technology Basics | 25% | - IPv6 basics - IPv4 addressing, subnetting - IP routing basics and forwarding - Static routing, OSPF fundamentals |
| Topic 2: Typical Campus Networking Solution | 5% | - Campus network design and integration - End-to-end networking scenarios |
| Topic 3: Data Communication Network Basics | 10% | - Data forwarding process - Basic network concepts and architecture - VRP system basics and operations - OSI and TCP/IP protocol models - Campus network basics - ARP, TCP/UDP principles |
| Topic 4: Network Security and Services | 15% | - DHCP, DNS, FTP, Telnet services - ACL, NAT principles and configuration - AAA and basic security technologies |
| Topic 5: Data Center Network Basics | 5% | - Basic data center networking technologies - Data center architecture overview |
| Topic 6: Ethernet Technology Basics | 20% | - Link aggregation and stacking technologies - Ethernet standards and switch principles - VLAN, STP, RSTP principles and configuration |
| Topic 7: WLAN Technology Basics | 10% | - 802.11 standards and WLAN components - WLAN architecture and working principles - Basic WLAN configuration |
| Topic 8: Network O&M and Troubleshooting | 10% | - Network monitoring and management tools - Fault diagnosis and troubleshooting methods |
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NEW QUESTION # 80
DAD enables a node to detect whether an IPv6 address is already in use by another node before assigning it to an interface. This ensures that duplicate unicast addresses do not exist on a network. Which of the following packets are used for DAD? (Select all that apply)
Answer: A,D
Explanation:
Duplicate Address Detection (DAD) is an IPv6 mechanism used to verify that a unicast address is not already in use before the address is assigned to an interface. DAD is implemented using Neighbor Solicitation (NS) and Neighbor Advertisement (NA) messages, which are part of the ICMPv6 Neighbor Discovery protocol.
Therefore, options A and D are correct.
When a host wants to verify a tentative IPv6 address, it sends an NS message for that address. If another node on the link is already using that address, that node responds with an NA message, indicating the address is duplicated and cannot be assigned. If no NA is received within the required period, the host assumes the address is unique and can use it. Options B and C are incorrect because Router Solicitation (RS) and Router Advertisement (RA) are used for router discovery, prefix advertisement, and stateless address autoconfiguration, not for DAD itself. HCIA-Datacom emphasizes the distinction between Neighbor Discovery functions, including address resolution, next-hop reachability, router discovery, and duplicate address detection in IPv6 networks.
NEW QUESTION # 81
The figure shows the process of a DHCP client obtaining an IP address from a DHCP server for the first time.
Match the following DHCP message types with the corresponding numbered stages shown in the figure.
Answer:
Explanation:
Explanation:
B, A, D, C
The HCIA-Datacom V2.0 Training Material explains that DHCP clients obtain IP addresses through four stages: Discovery, Offer, Request, and Acknowledgment.
In stage 1, the client broadcasts a DHCP DISCOVER message to locate available DHCP servers because it does not yet know the server ' s IP address.
In stage 2, a DHCP server responds with a DHCP OFFER containing an available IP address and other configuration parameters.
In stage 3, the client broadcasts a DHCP REQUEST to indicate the selected server and requested address.
Finally, in stage 4, the selected server sends a DHCP ACK confirming the allocation.
This four-stage process is commonly called DORA: Discover, Offer, Request, and Acknowledge.
NEW QUESTION # 82
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 # 83
Assume that PC1 and PC2 can communicate with each other. When R1 forwards a data packet sent from PC1 to PC2, which of the following statements are true?
Answer: C,D
Explanation:
This question tests the difference between Layer 3 addressing and Layer 2 encapsulation during routing. The IP packet originated by PC1 keeps PC1 ' s IP address as its source IP and PC2 ' s IP address as its destination IP as it traverses the routers. Ethernet MAC addresses, however, are rewritten at every routed hop. When R1 forwards the packet across the link toward R2, R1 builds a new Ethernet frame on its outgoing interface.
According to the exhibit, R1 ' s outgoing interface on the R1-R2 link uses MAC_C, so MAC_C is the source MAC address. The next-hop device on that link is R2, whose receiving interface uses MAC_D, so MAC_D is the destination MAC address. MAC_A belongs to PC1 and was relevant only on the first local Ethernet segment. MAC_F belongs to PC2 and is used on the final Ethernet segment from R2 to PC2, not on the R1- R2 link. Therefore the correct statements are B and D. The uploaded key B, C is incorrect.
NEW QUESTION # 84
Compared with Wi-Fi 6, Wi-Fi 7 uses which of the following technologies to improve performance?
Answer: A,B,C,D
Explanation:
Huawei ' s Wi-Fi 7 documentation describes several technologies introduced or enhanced relative to Wi-Fi 6 to increase throughput, spectrum efficiency, and reduce latency. 4096-QAM raises modulation density from the 1024-QAM maximum associated with Wi-Fi 6, allowing more bits to be carried per modulation symbol under suitable radio conditions. Multi-RU allows one user to be assigned multiple resource units, improving spectrum scheduling flexibility compared with the Wi-Fi 6 restriction of a user operating within its assigned RU. Multi-link operation allows a station to establish and use links across multiple bands or radios as a coordinated connection. Wi-Fi 7 also enhances MU-MIMO capabilities, increasing the ability to serve multiple users and exploit additional spatial resources. Huawei product documentation commonly lists 4096- QAM, multi-RU, MLO/multi-link, and enhanced MU-MIMO among Wi-Fi 7 improvements built on Wi-Fi 6.
Therefore, each technology listed in the question contributes to Wi-Fi 7 performance improvement, and the verified selection is A, B, C, and D.
NEW QUESTION # 85
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