Assigning a VLAN to a port is a way of isolating traffic on a network switch. It allows you to segment different types of traffic, such as voice and data, onto separate VLANs. This helps improve network performance and security by limiting access to certain users or devices. When assigning a VLAN to a port, the port is given a VLAN ID which is used to identify the VLAN the port belongs to.

SSH key login is a secure authentication method used to log in to remote systems. It uses cryptographic keys to verify the identity of the user. Public-private key pairs are generated, with the private key kept secret and the public key shared. When the user attempts to log in to the remote system, it will use the public key to verify the identity of the user before granting access. This method is more secure than traditional username-password authentication and is widely used in server administration.

1. Monitor for Unusual Network Activity: Check for unusual activity on your server’s network. Look for spikes in incoming and outgoing traffic, and look for any unusual patterns or traffic sources.

2. Monitor CPU and Memory Usage: Check your server’s CPU and memory usage. If the server is being subjected to a DDoS attack, it will be under heavy load, and you should see a corresponding increase in resource usage.

3. Check for Log Entries: Check your server’s logs for any suspicious entries. DDoS attacks typically cause log entries that can help you identify the source of the attack.

4. Monitor for Suspicious Processes: Check for any suspicious processes running on your server. If a DDoS attack is underway, it’s likely that malicious processes will be running on your server.

5. Check for Malware: Scan your server for any malware or malicious software. This is especially important if your server has been subject to a DDoS attack in the past, as the attackers may have installed malware to keep the attack going.