1. What utility can you use to assign a static IP address to a network interface in Linux?
- **Answer:** You can use either `ifconfig` or `ip` command-line utility. For example:
```
sudo ifconfig eth0 <desired_ip_address>
```
or
```
sudo ip addr add <desired_ip_address> dev eth0
```
2. Which command-line tool can you use to check the status of a network interface, including whether it is up or down?
- **Answer:** You can use the `ifconfig` or `ip` command. For example:
```
ifconfig eth0
```
or
```
ip link show eth0
```
3. What command-line tool can you use to configure firewall rules, including allowing or blocking specific ports or IP addresses?
- **Answer:** `iptables` is the command-line tool used to configure firewall rules in Linux.
4. Which tool can you use to create a virtual private network (VPN) connection in Linux?
- **Answer:** `OpenVPN` is a popular tool for creating VPN connections in Linux.
5. What command-line utility can you use to display information about the Domain Name System (DNS) resolver configuration on a Linux system?
- **Answer:** You can use the `resolv.conf` file or the `systemd-resolve` command-line utility to display DNS resolver configuration in Linux.
For example:
```
cat /etc/resolv.conf
```
or
```
systemd-resolve --status
```
These tools are fundamental for managing network configurations and connections in a Linux environment.
