*Question G8C06:
What action results from a failure to exchange information due to excessive transmission attempts when using an ARQ mode?*  

*Correct Answer is  B: The connection is dropped*  

### AI Response: (may contain errors)  

In an ARQ (Automatic Repeat reQuest) mode, the communication system automatically requests the retransmission of data if errors are detected. This ensures data integrity by confirming that the information is received correctly.

1. **Correct Answer: The connection is dropped**

   - When there are excessive transmission attempts and the system still fails to exchange information successfully, the ARQ protocol will eventually terminate the connection. This is because the protocol is designed to maintain data integrity and efficiency, and if it cannot achieve successful communication after multiple attempts, it assumes the connection is not viable.

2. **Why the other choices are incorrect:**

   - **A: The checksum overflows**  
     - A checksum is a value used to verify the integrity of data. It does not "overflow" due to excessive transmission attempts. Instead, it is recalculated for each packet to check for errors.

   - **C: Packets will be routed incorrectly**  
     - Packet routing is not directly affected by the number of transmission attempts. Routing issues are typically related to network configuration or errors, not the ARQ process.

   - **D: Encoding reverts to the default character set**  
     - Encoding refers to how data is represented for transmission. It does not change due to transmission attempts. Encoding is set by the communication protocol and remains consistent unless manually changed.

In summary, the ARQ protocol is designed to ensure reliable communication. If it cannot achieve this after multiple attempts, it will drop the connection to prevent further inefficiencies.