\begin{tabular}{l} Select all the reasons whyknowing a hostname is important: \\ I Navigating networks \\ \hline Configuring systems \\ \hline Troubleshooting issues \\ \hline Formattinghard drives \end{tabular}

To determine the importance of knowing a hostname, let's analyze each option provided: 1. **Navigating networks**: Knowing a hostname is crucial for navigating networks as it allows users to identify and connect to specific devices or services within a network. 2. **Configuring systems**: Hostnames are often used in system configurations, especially in network settings, to ensure that systems can communicate with each other effectively. 3. **Troubleshooting issues**: When troubleshooting network issues, knowing the hostname helps in identifying the specific device that may be causing problems, making it easier to diagnose and resolve issues. 4. **Formatting hard drives**: This option is not relevant to knowing a hostname. Formatting hard drives is a process that does not require knowledge of hostnames, as it pertains to storage management rather than network identification. Based on this analysis, the reasons why knowing a hostname is important are: - Navigating networks - Configuring systems - Troubleshooting issues The option "Formatting hard drives" is not a valid reason.