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| Section | Weight | Objectives |
|---|---|---|
| Network O&M and Troubleshooting | 10% | - Common network fault diagnosis - Network documentation and baselining - Troubleshooting methodology and process - Network maintenance tools (ping, tracert, display commands) |
| Data Communication Network Basics | 10% | - Basic network concepts, IP network architecture, and standardization organizations - Basic concepts and life cycle of campus network - TCP/UDP principles - Data forwarding process - ARP principles - Basic principles and operations of VRP (Versatile Routing Platform) - OSI and TCP/IP protocol models and functions of each layer |
| Data Center Network Basics | 5% | - Cloud computing and virtualization basics - Data center network architecture overview - Data center fabric concepts (VXLAN, SDN) |
| WLAN Technology Basics | 10% | - WLAN networking architecture (AC + AP) - WLAN RF fundamentals (channels, bands) - WLAN basic configuration and troubleshooting - WLAN overview and 802.11 standards |
| Ethernet Technology Basics | 20% | - STP / RSTP / MSTP spanning tree protocols - MAC address table and forwarding - Link aggregation (LACP) - VLAN principles and configuration - VLAN intercommunication (sub-interface, VLANIF) - Ethernet overview and frame structure |
| IP Technology Basics | 25% | - IPv6 basics and address types - OSPF fundamentals (single-area) - ICMP protocol - Static routing and default routing - IPv4 addressing and subnetting - DHCP principles and configuration - ACL (Access Control List) - NAT (Network Address Translation) |
| Typical Campus Networking Solution | 5% | - Network reliability and redundancy design - Typical campus network deployment scenarios - Hierarchical network model (core, aggregation, access) - Campus network architecture design |
| Network Security and Services | 15% | - AAA (Authentication, Authorization, Accounting) - Network management protocols (SNMP, NTP) - Network security overview - FTP / TFTP and file management - IPsec VPN fundamentals - Firewall basics and security zones |
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NEW QUESTION # 112
Which of the following port states are included in Rapid Spanning Tree Protocol (RSTP)?
Answer: A,B,D
Explanation:
RSTP (Rapid Spanning Tree Protocol) combines the Blocking, Listening, and Disabled states into Discarding, reducing the number of states to Discarding, Learning, and Forwarding. RSTP does not use a separate Listening state, as in standard STP.
NEW QUESTION # 113
On the network shown in the figure, GE1/0/1 of SW1 is an access interface and its PVID is VLAN 2. GE1/0/1 and GE1/0/2 of SW2 are access interfaces and their PVIDs are VLAN 3. The interfaces connecting SW1 and SW2 are trunk interfaces that allow packets from VLAN 2 and VLAN 3 to pass through and retain the default PVID.
The administrator finds that PC2 can dynamically obtain an IP address from the DHCP server, but PC1 cannot. The administrator determines that a possible cause is that PC1 and the DHCP server are in different broadcast domains.
Answer: B
Explanation:
DHCP automatically assigns IP configuration parameters to network clients. During initial address acquisition, a DHCP client broadcasts a DHCPDISCOVER message to locate available DHCP servers.
Ethernet switches normally forward these broadcasts only within the originating VLAN.
In this scenario, PC1 belongs to VLAN 2, while PC2 and the DHCP server belong to VLAN 3. The trunk connection permits traffic from both VLANs but maintains their Layer 2 isolation.
Therefore, DHCP broadcasts generated by PC1 in VLAN 2 cannot directly reach the DHCP server in VLAN
3.
PC2 can obtain an address because it shares the DHCP server ' s broadcast domain.
Communication between these VLANs would require Layer 3 forwarding, and DHCP relay functionality would normally be required to forward DHCP requests across the VLAN boundary.
Consequently, the administrator ' s explanation is correct.
NEW QUESTION # 114
At the egress of an enterprise campus network, which of the following technologies can the administrator deploy to allow only specific private IP addresses to access the Internet?
Answer: B
Explanation:
At the enterprise campus network egress, the technology used to control which private IP addresses can access the Internet is NAT, typically combined with ACLs. NAT performs address translation for private IPs to public IPs and can be configured with policies to restrict which internal addresses are allowed to be translated and forwarded to the Internet. SSH, FTP, and AAA are not used for traffic forwarding control at the network egress.
NEW QUESTION # 115
Drag and Drop Question
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. Match the port roles after the network is stable with the ports. (Token is reusable)
Answer:
Explanation:
Explanation:
Designated port: GE1/0/1 of SW1, GE1/0/2 of SW1, GE1/0/3 of SW2
Root port: GE1/0/1 of SW2, GE1/0/3 of SW3
Alternate port: GE1/0/2 of SW3
SW1 is the root bridge, so all its active interfaces toward other switches operate as designated ports. Each non-root switch selects its root port based on the lowest total path cost to SW1: SW2 prefers the direct link to SW1, while SW3 prefers the path via SW2 because it has a lower cumulative cost than its direct link to SW1. On the SW2-SW3 segment, the switch with the lower path cost to the root becomes the designated port, while the other side becomes an alternate (blocked) port to prevent loops.
NEW QUESTION # 116
Which of the following phases are required for establishing a connection between an SSH server and an SSH client? (Select all that apply)
Answer: A,B,C,D
Explanation:
The establishment of an SSH connection includes multiple mandatory phases that ensure both secure communication and authenticated access. First, the SSH client and server perform version negotiation to determine a mutually supported SSH protocol version. Then they carry out algorithm negotiation, during which they agree on the encryption algorithm, key exchange algorithm, integrity algorithm, and other security parameters to be used for the session.
After that, the peers perform key exchange, which is used to derive shared session keys securely over an insecure network. This stage is essential because it enables subsequent communication to be encrypted and protected against interception. Finally, once the secure channel has been established, user authentication is performed so that the server can verify the identity of the client user. This can be done using a password, public key, or other supported authentication method. Therefore, all four options are required phases in the SSH connection establishment process. HCIA-Datacom emphasizes these steps because SSH is a core secure management protocol used to replace insecure protocols such as Telnet and FTP in modern network operation and maintenance.
NEW QUESTION # 117
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