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NEW QUESTION # 15
With the continuous update and development of data center services, the architecture of general-purpose computing data center networks is also evolving. A cloud-based data center uses a cloud platform to centrally integrate resources and deliver compute, storage, and network services. Which of the following network architectures is used by such a data center?
Answer: A
Explanation:
Modern cloud data centers require horizontal scalability, high east-west bandwidth, virtualization support, and flexible tenant network extension. A spine-leaf physical topology provides predictable low-hop connectivity between leaf switches by connecting each leaf to the spine layer. VXLAN provides an overlay that can create large numbers of logical Layer 2 segments over the Layer 3 underlay and is well suited to virtualized and multi-tenant cloud environments. The combination of Spine-Leaf and VXLAN is therefore a standard architecture for cloud-based general-purpose data center networks. M-LAG with Eth-Trunk can provide device and link redundancy but does not by itself provide the scalable overlay architecture expected for a cloud fabric. PFC and ECN are lossless-network and congestion-management technologies rather than a complete general-purpose data center architecture. STP with VRRP represents more traditional Layer 2 redundancy and gateway protection and does not offer the same cloud-fabric scalability. Consequently, the architecture described in the question is Spine-Leaf + VXLAN, making option B correct.
NEW QUESTION # 16
Which of the following DHCPv4 messages are sent by a DHCPv4 server?
Answer: A,B
Explanation:
The normal DHCPv4 address-allocation exchange is commonly summarized as DORA: Discover, Offer, Request, and Acknowledge. A DHCP client that needs configuration begins by sending DHCPDISCOVER to locate available DHCP servers. A server responds with DHCPOFFER, proposing an address and other parameters. The client then sends DHCPREQUEST to indicate the offered address and server it has selected.
Finally, the selected DHCP server sends DHCPACK to confirm the lease and deliver the final configuration.
Therefore, DHCPDISCOVER and DHCPREQUEST are client-originated messages in the standard allocation process, while DHCPOFFER and DHCPACK are server-originated messages. DHCP also defines other messages for lease renewal, decline, release, and negative acknowledgment, but those are not among the answer choices. For the options provided, A, DHCPACK, and D, DHCP OFFER, are the messages sent by a DHCPv4 server. The verified answer is A and D. This server-versus-client message direction is fundamental when interpreting DHCP packet captures and troubleshooting address-allocation failures on enterprise campus access networks.
NEW QUESTION # 17
On the network shown in the figure, GE1/0/1, GE1/0/2, and GE1/0/3 of SW1 are directly connected to SW2, and GE1/0/4 of SW1 is directly connected to SW3. The administrator runs the interface eth-trunk 1 command on SW1 and SW2 to create an Eth-Trunk to increase link bandwidth. Which of the following statements are true about this scenario?
Answer: A,C,D
Explanation:
LACP mode and manual load-balancing mode behave differently when an Eth-Trunk contains a link connected to the wrong peer. In LACP mode, member interfaces exchange LACPDUs and the switches determine which physical links can participate in the same aggregation. GE1/0/1 through GE1/0/3 are correctly connected between SW1 and SW2, so they can form an operational LACP Eth-Trunk. GE1/0/4 is connected to SW3 and cannot successfully negotiate as a member of the SW1-SW2 LAG; it is therefore not used for service forwarding to SW3. This makes A and B true. In manual mode, there is no LACP negotiation to validate that every member terminates on the same peer. If GE1/0/4 is manually placed in the trunk, the device may treat it as a forwarding member and hash some traffic onto that link toward SW3. The trunk does not automatically go Down solely because of that incorrect peer connection. Therefore C is false and D is true.
NEW QUESTION # 18
The undo command can be used in the CLI of a Huawei device to restore default settings, disable functions, or delete configurations. Which of the following are correct undo commands? (Select all that apply)
Answer: A,B,C
Explanation:
On Huawei devices, the undo command is used to remove a previously applied configuration, disable a function, or restore a parameter to its default state. In option B, undo ip address is a valid interface-view command that removes the IP address configured on the interface. In option C, undo portswitch is also a valid interface command on switch interfaces that converts a Layer 2 interface into a Layer 3 interface when supported by the device. In option D, undo sysname restores the device name to the default hostname, which is valid in system view.
NEW QUESTION # 19
Network administrators need to manage and maintain devices on the campus network. Which of the following protocols cannot modify device configurations, such as interface IP addresses, device names, and so on?
Answer: C
Explanation:
The protocol that cannot directly modify device configurations such as interface IP addresses or device names is SFTP, so option C is correct. SFTP is a secure file transfer protocol that runs over SSH and is mainly used to upload, download, and manage files between a client and a network device. It is commonly used for tasks such as transferring configuration files, system software, patches, or log files, but it does not itself provide an interactive or structured configuration modification mechanism.
By contrast, STelnet allows secure remote CLI login, through which an administrator can directly enter commands to change device settings. NETCONF is specifically designed for network configuration management and can modify configurations in a structured manner. SNMP can also modify certain managed object values through write operations when permissions and MIB support allow it, although in practice it is used more often for monitoring. HCIA-Datacom distinguishes between management-plane protocols based on their roles: interactive access, structured configuration, monitoring, and file transfer. This question checks whether the learner can identify SFTP as a file transfer tool rather than a direct configuration protocol.
NEW QUESTION # 20
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