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NEW QUESTION # 82
In the WAC + Fit AP networking, an AP fails to go online. The output of the display ap all command run on the WAC is shown below. According to the command output, which of the following is the possible cause of the AP's failure to go online?
Answer: B
Explanation:
The correct answer is C. In the command output, the AP state is shown as ver-mismatch. This state directly indicates a version mismatch between the AP and the WAC. In Huawei WLAN deployment, a Fit AP must use a software version that is compatible with the WAC version. If the versions do not match, the AP may be discovered by the WAC and appear in the AP list, but it cannot successfully complete the online process.
Option A is incorrect because blacklist-related failures are displayed with blacklist-related status information, not ver-mismatch. Option B is also incorrect because authentication failures normally generate authentication- related fault indications. Option D is incorrect because configuration initialization failure would not be identified by the specific ver-mismatch state.
HCIA-Datacom troubleshooting knowledge emphasizes reading AP online states carefully. Common causes of AP online failure include IP address acquisition failure, CAPWAP tunnel establishment failure, insufficient licenses, authentication problems, and version mismatch. When the state explicitly shows ver-mismatch, the troubleshooting direction is clear: check AP and WAC software compatibility and upgrade or align the software version as needed.
NEW QUESTION # 83
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 # 84
OSPF has five types of packets. Which type is used to notify an OSPF neighbor of its required LSAs?
Answer: C
Explanation:
In OSPF, the packet type used to request specific link-state advertisements from a neighbor is the Link State Request (LSR) packet. Therefore, option B is correct. During database synchronization, OSPF neighbors first discover each other with Hello packets, then exchange summaries of their databases using Database Description (DD) packets. If one router finds that it is missing certain LSAs or has older versions, it sends an LSR packet to request the needed LSAs from its neighbor.
The neighbor then responds with a Link State Update (LSU) packet containing the requested LSAs. Finally, the receiving router confirms proper receipt with a Link State Acknowledgment (LSAck) packet. HCIA- Datacom emphasizes understanding the roles of these five OSPF packet types because they are central to neighbor formation, adjacency establishment, and LSDB synchronization. This question specifically tests whether the learner can distinguish between the request packet ( LSR ) and the update packet ( LSU ). The router does not use a DD packet to request detailed LSA content; DD packets provide database summaries, while LSR packets explicitly request the LSAs that are needed.
NEW QUESTION # 85
R1 has four static routes, each of which has a reachable next hop. Given the following static route configuration, what is the next hop of the route to 20.0.0.0/30 in R1's routing table?
[R1] ip route-static 20.0.0.0 30 10.1.1.2
[R1] ip route-static 20.0.0.0 30 10.1.2.2 preference 7 0
[R1] ip route-static 20.0.0.0 30 10.1.3.2 preference 50
[R1] ip route-static 20.0.0.0 30 10.1.4.2 preference 100
Answer: A
Explanation:
When multiple static routes exist to the same destination prefix and all next hops are reachable, the device selects the route with the highest priority , which on Huawei devices means the lowest preference value . In this question, all four static routes point to the same destination network 20.0.0.0/30, but they have different preference values.
The route through 10.1.1.2 uses the default static route preference , which is 60 on Huawei devices. The route through 10.1.2.2 has a preference of 70 , the route through 10.1.3.2 has a preference of 50 , and the route through 10.1.4.2 has a preference of 100 . Since 50 is the lowest value among them, the route via 10.1.3.2 is preferred and installed in the routing table. Therefore, option D is correct. HCIA-Datacom emphasizes that when prefix length is identical, route preference determines which route is active. This principle is widely used in route backup design, where primary and floating backup static routes are configured using different preference values to control failover behavior.
NEW QUESTION # 86
A small enterprise's switches do not support LACP. Therefore, the administrator manually binds two links between two switches into an Eth-Trunk. Which of the following statements are false about this scenario? (Choose all that apply.)
Answer: B,D
Explanation:
Manually configured Eth-Trunk (static aggregation) does not support dynamic link management features such as automatic link addition or load-based negotiation. If a link fails, it is simply removed from forwarding but not automatically replaced by another link, and the system does not dynamically add new active links.
Also, static Eth-Trunk operates in load-sharing mode, not active/standby mode, so both links forward traffic simultaneously under normal conditions.
NEW QUESTION # 87
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