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NEW QUESTION # 23
The figure shows the simplified topology of an enterprise campus network. On this network, the aging time of dynamic MAC address entries on switches is 300 seconds.
The administrator connects PC1 to GE1/0/1 of SW1 and successfully pings the IP address of PC2 from PC1.
Then, the administrator disconnects the Ethernet cable of PC1
from GE1/0/1 of SW1, immediately connects the cable to GE1/0/2 of SW1, and pings the IP address of PC2 from PC1. Which of the following operations does SW1 perform after receiving a data frame from PC1 when PC1 is connected to GE1/0/2 of SW1?
Answer: C
Explanation:
An Ethernet switch learns MAC address entries dynamically by examining the source MAC address of incoming frames. When SW1 first receives frames from PC1 on GE1/0/1, it creates a MAC address table entry mapping PC1's MAC address to that port. If PC1 later sends frames that arrive on GE1/0/2, SW1 updates the learned entry to reflect the new incoming interface. Therefore, option B is correct: SW1 saves the mapping between PC1's MAC address and GE1/0/2 and removes or overwrites the old mapping associated with GE1/0/1.
Option A is incorrect because a single dynamic MAC address is not normally maintained on two different ports within the same VLAN at the same time; that would cause forwarding ambiguity. Option C is incorrect because a normal move of one MAC address does not require clearing the entire MAC table. Option D is also incorrect because switches update MAC learning dynamically upon receiving new source traffic and do not have to wait for the previous entry to age out. HCIA-Datacom uses this principle to explain MAC address learning, migration, and troubleshooting of loops or host movement in switched Ethernet networks.
NEW QUESTION # 24
On the campus network shown in the figure below, the core switch Core1 functions as a Layer 3 gateway and as a DHCP server to dynamically assign IP addresses to AP1, PC1, PC2, and PC3.
The network below Core1 is a Layer 2 network. WAC1 and R1 are connected to Core1 at Layer
3. AP1 goes online through VLAN 100. The wireless service VLAN is VLAN 101, and the wired service VLANs for PC2 and PC3 are VLAN 102 and VLAN 103, respectively. Additionally, the direct forwarding mode is used for wireless traffic forwarding. If no additional VLANs are allowed on device interfaces, which of the following VLANs must be allowed on GE1/0/1 of ACC1? (Select all that apply)
Answer: B,C,D
Explanation:
According to the original topology and service-planning question, the required VLANs are VLAN
100, VLAN 101, and VLAN 102, so options A, B, and C are correct. In HCIA-Datacom campus design questions, VLAN planning is usually based on service separation, such as user services, voice services, wireless services, management services, or specific departmental segmentation.
Each service type is assigned an appropriate VLAN so that broadcast domains are separated and policies can be applied more effectively.
NEW QUESTION # 25
Which of the following fields are included in an MPLS header?
Answer: A,C,D
Explanation:
An MPLS (Multiprotocol Label Switching) header includes the following fields:
Label: Identifies the MPLS path.
TTL (Time to Live): Limits the lifetime of the MPLS packet.
EXP (Experimental): Used for QoS marking. The Tos (Type of Service) field is part of the IP header, not MPLS.
NEW QUESTION # 26
The domain to which a user belongs is determined by the user name used by the user to log in to the NAS device. If the domain name carried in the user name is not configured on the NAS device, the authentication fails.
Answer: A
Explanation:
This statement is false. On Huawei devices, the domain to which a user belongs is usually determined by the domain part carried in the user name, for example user@huawei.com.
However, if the specified domain is not configured on the NAS device, authentication does not necessarily fail immediately. In many cases, the device can use a default domain for authentication processing, depending on the AAA configuration.
Huawei AAA supports both an administrator user default domain and a normal user default domain. If a user name does not match a configured domain, or the domain carried in the user name is unavailable, the device may fall back to the default domain and continue authentication according to the configured policy. Therefore, the statement is incorrect because it treats authentication failure as unavoidable in every such case. HCIA-Datacom emphasizes domain- based AAA processing because it allows different groups of users to use different authentication, authorization, and accounting methods. At the same time, learners must understand the function of default domains, which provide flexibility in real deployments and prevent unnecessary authentication failures in some login scenarios.
NEW QUESTION # 27
If a network device has both a static route and a direct route to network 10.1.1.0/24, it uses the direct route preferentially.
Answer: A
Explanation:
This statement is true . When a device has multiple routes to the same destination prefix, route selection is based first on the longest prefix match , and when prefix length is the same, the device compares the route preference or administrative priority associated with each routing source. On Huawei devices, a direct route has a better preference than a static route , so the direct route is selected first when both routes have the same destination and mask.
A direct route is generated automatically when an IP address is configured on an interface and that interface is Up. Because the destination network is directly connected, this route is considered more trustworthy and efficient than a manually configured static route pointing to the same prefix. HCIA-Datacom uses this principle to explain route selection, routing-table generation, and troubleshooting cases where a configured static route does not appear as the active route because a direct or dynamic route has higher priority. This is a basic but important concept in IP forwarding and helps engineers correctly interpret routing tables on Huawei routers and Layer 3 switches.
NEW QUESTION # 28
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