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NEW QUESTION # 161
Which of the following packets are exchanged between STAs and an AP to obtain the AP's SSID before association with the AP?
Answer: B,C,D
Explanation:
Probe Request: Sent by the client to detect nearby APs.
Probe Response: Sent by APs in response to the client's request.
Beacon: Periodically broadcast by APs to announce their presence and SSID. The Discovery packet type does not exist in the 802.11 standard.
NEW QUESTION # 162
The rules in an ACL may overlap. If packets match the rules with loose conditions, the later ACL rules are not processed. In this case, packets cannot match the rules with strict conditions.
Therefore, the rules with strict conditions must be arranged in front lines and those with loose conditions must be arranged towards the end.
Answer: B
Explanation:
Access Control Lists (ACLs) are processed in sequential order, meaning that once a packet matches a rule, subsequent rules are ignored. To ensure that more specific (strict) conditions are applied, strict rules should be listed first, followed by loose rules.
NEW QUESTION # 163
On the network shown in the figure, R1 and R2 are directly connected through a physical link.
When the link is normal, R1 can ping the IP address of R2's interface.
Answer: A
Explanation:
Although R1 and R2 are directly connected and belong to the same subnet (10.0.12.0/24 vs
10.0.21.0/24), they are actually in different IP networks. R1's interface is in 10.0.12.0/24 while R2's interface is in 10.0.21.0/24, which are not the same subnet, so they cannot communicate directly at Layer 3 without routing. Therefore, R1 cannot successfully ping R2's interface IP under normal conditions.
NEW QUESTION # 164
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. After the network is stable, which of the following paths is used by SW1 to send traffic to SW4?
Answer: A
Explanation:
After STP convergence, only ports in the forwarding state participate in active traffic forwarding, while redundant ports may be placed into the blocking or discarding state to eliminate loops. According to the topology and STP role election shown in the question, the valid forwarding path from SW1 to SW4 is SW1 # SW3 # SW4, so option B is correct.
This means that the direct alternative path or the path through SW2 is not the active spanning-tree forwarding path after election and state transition. STP selects paths based on the root bridge, path cost, bridge ID, and port ID. Once the root bridge and port roles are determined, some links remain active and others are blocked to ensure a loop-free Layer 2 topology. HCIA-Datacom emphasizes that the resulting forwarding topology is a tree, not a mesh, even if the physical topology contains redundant links. Understanding the actual forwarding path after STP convergence is important for troubleshooting connectivity, predicting traffic behavior, and verifying whether bridge priority and path-cost settings have produced the intended design outcome in campus switching networks.
NEW QUESTION # 165
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.
Answer: B
Explanation:
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.
NEW QUESTION # 166
......
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