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| Section | Weight | Objectives |
|---|---|---|
| Network Security and Services | 15% | - Network security overview - FTP / TFTP and file management - IPsec VPN fundamentals - Firewall basics and security zones - Network management protocols (SNMP, NTP) - AAA (Authentication, Authorization, Accounting) |
| Ethernet Technology Basics | 20% | - VLAN principles and configuration - MAC address table and forwarding - STP / RSTP / MSTP spanning tree protocols - Ethernet overview and frame structure - VLAN intercommunication (sub-interface, VLANIF) - Link aggregation (LACP) |
| Network O&M and Troubleshooting | 10% | - Common network fault diagnosis - Troubleshooting methodology and process - Network documentation and baselining - Network maintenance tools (ping, tracert, display commands) |
| Data Center Network Basics | 5% | - Data center fabric concepts (VXLAN, SDN) - Data center network architecture overview - Cloud computing and virtualization basics |
| Typical Campus Networking Solution | 5% | - Campus network architecture design - Typical campus network deployment scenarios - Network reliability and redundancy design - Hierarchical network model (core, aggregation, access) |
| 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% | - ACL (Access Control List) - IPv4 addressing and subnetting - IPv6 basics and address types - NAT (Network Address Translation) - OSPF fundamentals (single-area) - ICMP protocol - DHCP principles and configuration - Static routing and default routing |
| Data Communication Network Basics | 10% | - ARP principles - TCP/UDP principles - Basic network concepts, IP network architecture, and standardization organizations - Basic principles and operations of VRP (Versatile Routing Platform) - Data forwarding process - Basic concepts and life cycle of campus network - OSI and TCP/IP protocol models and functions of each layer |
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115. Frage
The Protocol field in a packet's IP header identifies the upper-layer protocol that will continue to process the packet. For an ICMP packet, the Protocol field defaults to 0.
Antwort: A
Begründung:
The Protocol field in the IP header identifies the upper-layer protocol such as ICMP, TCP, or UDP. ICMP is identified by protocol number 1, not 0. Therefore, the statement that ICMP uses a default value of 0 is incorrect.
116. Frage
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.
Antwort: A
Begründung:
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.
117. Frage
Which of the following IPv6 addresses is a link-local address ?
Antwort: B
Begründung:
In IPv6, link-local addresses use the prefix FE80::/10 . These addresses are automatically generated or configured for communication on the local link only and are not routed across Layer 3 boundaries. Therefore, among the given options, FE80::FA63:DBFF:FE9E:10 is the correct link-local address, making option C correct.
Options A and B belong to the Unique Local Address (ULA) space, which uses the prefix FC00::/7 . These addresses are intended for private internal IPv6 networks, somewhat similar in purpose to private IPv4 address ranges, but they are not link-local addresses. Option D , which starts with 2001::, is a global unicast address , used for routable communication across IPv6 networks. HCIA-Datacom teaches that link-local addresses are essential in IPv6 because they are used for functions such as neighbor discovery, router discovery, and routing protocol communication on the local segment. Even when a device has global unicast addresses, the link-local address still plays an important role in normal IPv6 operation and protocol adjacency establishment.
118. Frage
Drag and Drop Question
ACLs can be classified into basic ACLs, advanced ACLs, and Layer 2 ACLs based on the rule type. Drag the ACL rules to the correct positions.
Antwort:
Begründung:
Explanation:
Basic ACL → Defines packet filtering rules based on source IPv4 addresses, fragment information, and effective time ranges.
Advanced ACL → Defines packet filtering rules based on source/destination IPv4 addresses, IP protocol types, TCP/UDP port numbers, fragment information, and effective time ranges.
Layer 2 ACL → Defines packet filtering rules based on Ethernet frame headers such as MAC addresses, VLAN IDs, and Layer 2 protocol types.
Basic ACLs operate mainly on source IP-related criteria. Advanced ACLs provide extended filtering using Layer 3 and Layer 4 information such as destination IPs and port numbers. Layer 2 ACLs work at the Ethernet frame level and filter traffic based on MAC addresses, VLAN IDs, and other Layer 2 fields.
119. Frage
Assume you need to assign IP addresses from different networks to four departments, which have 100, 50, 32, and 31 hosts, respectively. Assigning addresses from subnet 192.168.1.0/24 cannot meet this requirement.
Antwort: A
Begründung:
A /24 network (192.168.1.0/24) provides 256 IP addresses, with 254 usable host addresses.
Using VLSM, the host requirements are 100, 50, 32, and 31, which require subnet sizes of 128,
64, 64, and 64 addresses respectively (since 32-host and 31-host networks both need /26 or larger depending on usable host calculation). The total required address space exceeds what can be efficiently allocated within a single /24 network without overlap or waste constraints.
120. Frage
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