Huawei Updated H12-811_V1.0 Exam Questions and Answers by viktor

In RSTP, an edge port is intended to connect directly to end devices, not other switches. However, if the edge port receives a BPDU, it will lose its edge status and revert to a standard STP port. This feature prevents loops by reconfiguring the port based on network conditions​.

Comprehensive and Detailed Explanation:

The history-command max-size command in Huawei VRP (Versatile Routing Platform) is used to set the maximum number of previously used commands that can be saved in the command history buffer.

By default, Huawei devices store 5 previously-used commands in the buffer.

The command history-command max-size 20 increases the buffer size to 20 commands.

This does not limit the buffer to 20 bytes; instead, it allows 20 entire commands to be stored.

The correct statement that matches this behavior is:

" The history-command max-size 20 command sets the maximum of previously-used commands that can be saved in the buffer to 20. "

✅ Reference: HCIA-Datacom Configuration Guide – Command Line Interface

TPID Definition:

TPID (Tag Protocol Identifier) is a field in the Ethernet frame header that indicates the presence of an 802.1Q VLAN tag.

IEEE 802.1Q defines the TPID value as 0x8100.

Why Other Options Are Incorrect:

0x9100: Used in some proprietary protocols but not IEEE standard.

0x8200 and 0x7200: Not valid TPID values.

Comprehensive and Detailed In-Depth Explanation:

The ping command is used to test network connectivity by sending ICMP Echo Request messages to a destination host and waiting for ICMP Echo Reply responses.

Correct Answer:

(B) ICMP (Internet Control Message Protocol) is the protocol responsible for handling these echo requests and replies.

Incorrect Options:

(A) TCP (Transmission Control Protocol) is a connection-oriented protocol used for data transmission, not for network diagnostics like ping.

(C) ARP (Address Resolution Protocol) is used to resolve MAC addresses from IP addresses, but it is not involved in the ping process.

(D) UDR is not a valid protocol in this context.