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

Router Functionality:Routers operate at the Network Layer (Layer 3) of the OSI model. They use IP addresses to forward packets between different networks and determine the best path for data transmission based on routing tables​​.

Analysis of Options:

Option A: " Network layer " is correct, as routers are Layer 3 devices.

Option B: " Transport layer " handles end-to-end communication and reliability (e.g., TCP/UDP), not routing.

Option C: " Data link layer " is for local node-to-node data transfer (e.g., MAC addresses), handled by switches.

Option D: " Application layer " is for user-facing software interactions (e.g., HTTP, FTP).

Correct Answer:Routers work at the A (Network layer).

In DHCP (Dynamic Host Configuration Protocol):

The client starts renewal at 50% (0.5) of the lease time to extend its lease with the DHCP server.

If unsuccessful, it tries again at 87.5% (0.875) before the lease expires.

Option A (Incorrect - 0.875): This is the second attempt if the first renewal fails.

Option B (Correct - 0.5): The first renewal attempt occurs when the lease reaches 50% of its duration.

Option C (Incorrect - 0.25): No renewal attempt happens at 25%.

Option D (Incorrect - 1): At 100% lease expiration, the IP is released and a new request is needed.

Thus, the correct answer is B.