# Checking Cluster Availability

You can test connectivity of your VPC.

From a VM instance within the VPC network, try connecting to port 9042 with nc,
telnet, or cqlsh (the required credentials are on the Cluster page):

For example, with `nc`:

```none
nc -z 198.51.100.0 9042 && echo ok!
```

Using the `telnet` command, telnet to the IP address:

```none
telnet 198.51.100.0 9042
```