in most Active Directory Enviroments the Certificate Enrollment is active which generates and enrolls a certificate for each client. This can be used for Radius authentication or as certificate for an IIS webserver.
Typically the client renews this certificate itself.
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dhtest is a tool to generate DHCP packets and send it to a DHCP server.
to generate sshd host keys, for example in case of cloning a virtual linux instance, do the following steps:
Checkout the key file names
root@debdevt:~# grep HostKey /etc/ssh/sshd_config
# HostKeys for protocol version 2