Free Huawei H12-811_V1.0 Practice Exam with Questions & Answers | Set: 3

In RSTP, both alternate and backup ports do not forward user traffic, but they can still receive and process BPDUs (Bridge Protocol Data Units). This allows the network to quickly reconfigure if the active path fails, as these ports are already participating in spanning tree calculations​.

Detailed Explanation:While a switch will typically forward a unicast frame based on its MAC address table, certain scenarios like port security or VLAN restrictions may prevent the frame from being forwarded even if a MAC entry exists. (Reference: HCIA-Datacom Training Material, MAC Address Table and Frame Forwarding)

A (Correct): Stacking allows inter-chassis Ethernet Trunks to be created, improving redundancy and bandwidth.

B (Correct): Multiple switches act as a single logical device, simplifying network management.

C (Correct): Stacking increases available ports, allowing expansion without adding separate devices.

D (Correct): By enabling redundancy, stacking and CSS help prevent single points of failure in the network.

Thus, the correct answers are A, B, C, and D.

Comprehensive and Detailed Explanation:

802.11n operates on both 2.4 GHz and 5 GHz bands (Dual-band support). ✅

802.11ax (Wi-Fi 6) supports 6 GHz (but 802.11n does not). ❌

✅ Reference: HCIA-Datacom Wireless Guide – 802.11 Standards

On Huawei VRP (Versatile Routing Platform), the command history feature allows administrators to recall previously executed commands. The Upper cursor key (↑ arrow key) can be used to navigate through the command history and re-execute previously entered commands.

Ctrl+P is not a valid shortcut for recalling command history.

Ctrl+U is typically used to delete an entire line of input in command-line interfaces, not to recall history.

Left cursor key (←) is used for moving the cursor within a command line but does not invoke command history.

Thus, the correct answer is B. Upper cursor key (↑ arrow key).

Comprehensive and Detailed Explanation:

OSPF neighbor states occur in the following sequence:

Down → No Hello packets received.

Init → Hello received, but no bidirectional communication yet.

2-Way → Bidirectional Hello exchange, DR/BDR election happens here.

ExStart → Master/slave relationship is determined (B is correct).

Exchange → Routers exchange Database Description (DD) packets to describe their LSDBs (A and D are correct).

Loading → Link State Requests (LSR) and Link State Updates (LSU) occur.

Full → LSDB synchronization is complete (C is correct).

✅ Reference: HCIA-Datacom Routing Guide – OSPF Neighbor States

Detailed Explanation:The ACL (Access Control List) configuration only permits IP address 172.16.105.2. By applying this ACL to the Telnet server, only devices from this IP can establish a Telnet connection, while all others are denied access. (Reference: HCIA-Datacom Training Material, ACLs and Telnet Access Control)