What does the show service-module command indicate?

The show service-module command is specifically designed to provide information about the performance and operational status of integrated CSU/DSU modules within a router or switch that supports them. This command allows network technicians to diagnose and troubleshoot issues related to data transmission, ensuring that the integrated modules are functioning correctly and meeting the communication needs of the network. By using this command, one can verify the health of the connection, check for errors, and assess other performance metrics associated with the CSU/DSU modules, which are critical for connectivity to digital circuits like T1 or E1 lines.

The other options do not align with the purpose of the show service-module command. For example, routing metrics are typically assessed using other commands that focus on routing protocols, while Layer 3 IP addresses are managed through distinct configuration commands. Additionally, assessing the status of switch port connections is usually handled through commands like show interfaces or show vlan, which focus on switch port operation rather than the performance of CSU/DSU modules. Thus, understanding the specific function of the show service-module command is essential for network technicians working with integrated CSU/DSU technology.