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NEW QUESTION # 107
On the network shown in the figure, the three PCs belong to VLAN 2. When configuring interface-based VLAN assignment, the administrator only forgets to configure the PVID of GE1/0/1. However, PC1 can still communicate with PC2 at Layer 2.
Answer: B
Explanation:
Interface-based VLAN assignment determines the VLAN associated with an Ethernet frame according to the configuration of the receiving interface.
When an access interface receives an untagged frame, the switch assigns the frame to the VLAN specified by its Port VLAN ID (PVID).
In this scenario, the administrator forgets to configure the PVID of GE1/0/1 on SW1. Consequently, the interface retains its default PVID of VLAN 1.
PC1 sends untagged Ethernet frames through GE1/0/1, so those frames enter VLAN 1. Meanwhile, PC2 belongs to VLAN 2.
Because VLAN 1 and VLAN 2 represent separate Layer 2 broadcast domains, the switch does not directly forward traffic between them.
Without additional inter-VLAN routing or changes to VLAN membership, PC1 cannot communicate with PC2.
Therefore, the statement is FALSE.
NEW QUESTION # 108
In Layer 3 in-path WLAN networking, the WAC and Fit APs are connected at Layer 3. APs can obtain the WAC's address through broadcast or DHCP.
Answer: B
Explanation:
This statement is false . In Layer 3 in-path WLAN networking , the WAC and Fit APs communicate over Layer 3, which means the APs must discover the WAC through methods that are valid across Layer 3 boundaries. Broadcast is a Layer 2 mechanism and cannot normally be used for WAC discovery across Layer
3 networks. Therefore, saying that APs can obtain the WAC address through broadcast or DHCP in this scenario is incorrect.
In Huawei WLAN deployments, Fit APs can commonly discover the WAC address through methods such as DHCP option-based discovery , DNS , or preconfigured controller information, depending on the deployment model and product features. Because the WAC and AP are not in the same Layer 2 broadcast domain in Layer 3 in-path networking, broadcast discovery is not the standard mechanism here. HCIA- Datacom stresses the difference between Layer 2 direct discovery and Layer 3 discovery methods because this affects initial AP registration, CAPWAP establishment, and troubleshooting when APs fail to go online.
Understanding the discovery mechanism is essential when planning IP addressing, DHCP options, and controller placement in enterprise WLAN designs.
NEW QUESTION # 109
On a switched network where STP is enabled on all devices, when a downstream device detects a topology change, it continuously sends configuration BPDUs to the upstream device until the root bridge is informed of the topology change.
Answer: B
Explanation:
This statement is false . In classic STP, when a non-root switch detects a topology change, it does not continuously send configuration BPDUs upstream to notify the root bridge. Instead, it sends a Topology Change Notification (TCN) BPDU toward the root bridge through its root port. Each upstream switch acknowledges the TCN and forwards it further until it reaches the root bridge.
After the root bridge receives the topology change notification, the root bridge sets the Topology Change (TC) flag in its configuration BPDUs, and those configuration BPDUs are then propagated throughout the network. Therefore, topology-change notification and normal configuration BPDU transmission are different functions. The statement is wrong because it confuses TCN BPDUs with configuration BPDUs , and also inaccurately describes the notification behavior. HCIA-Datacom requires learners to distinguish between these BPDU types and understand how STP reacts to topology changes by accelerating MAC address aging and informing the network through the root bridge. This process helps the Layer 2 topology converge and reduces long-lasting forwarding inconsistencies after a link or port-state change.
NEW QUESTION # 110
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: D
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 # 111
Which of the following methods of the Python paramiko SSHClient class can be used to send commands to a network device?
Answer: C
Explanation:
In the Paramiko SSHClient class, the method used to execute commands on a remote network device is exec_command(), which sends the command over an established SSH session and returns the output.
NEW QUESTION # 112
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