In a Windows environment, you can use various commands to test network connectivity and diagnose network-related issues. Here are some commonly used commands for testing network connectivity:

1. **Ping**:
The `ping` command is used to test connectivity between your computer and a remote host (usually by sending ICMP echo request packets). It's a basic tool to check if a remote host is reachable and responsive.

```
ping
```

2. **Tracert (Traceroute)**:
The `tracert` command helps you trace the path that packets take to reach a remote host. It shows the route, IP addresses, and response times of each hop along the way.

```
tracert
```

3. **Nslookup (Name Server Lookup)**:
The `nslookup` command is used to query DNS servers to obtain information about domain names and IP addresses. It can help verify DNS resolution.

```
nslookup
```

4. **Netstat**:
The `netstat` command displays active network connections, listening ports, and related network statistics. It's useful for identifying open ports and active connections.

```
netstat -a
```

5. **Ipconfig (or ifconfig)**:
The `ipconfig` command displays information about your computer's IP configuration, including IP address, subnet mask, gateway, and more.

```
ipconfig /all
```

6. **Pathping**:
The `pathping` command combines the features of `ping` and `tracert`. It not only sends ICMP echo requests like `ping` but also provides route details like `tracert`.

```
pathping
```

7. **Telnet**:
While not installed by default in recent Windows versions, the `telnet` command can be used to test connectivity to a specific port on a remote host. It's useful for checking if a specific service is accessible.

```
telnet
```

8. **Test-Connection (PowerShell)**:
In Windows PowerShell, you can use the `Test-Connection` cmdlet to perform ICMP-based network connectivity tests.

```
Test-Connection
```

These commands provide valuable information for diagnosing network connectivity issues and troubleshooting problems in a Windows environment. Remember that some commands require administrative privileges to run successfully.