SSL is nothing but a protocol that provides communication security over the internet (network). SSL is responsible to encrypt the segments at the Application Layer using asymmetric cryptography for an exchange of key, message authenticity codes for message integrity & symmetric encryption for confidentiality.
SSL is host-based & is always installed on a domain, subdomain. SSL is never issued OR installed on an IP address.
If you generate a CSR on a domain with www (www.host-bd.com), it will be applicable on a domain with and without www (https://www.host-bd.com & https://host-bd.com). This does not include any other sub domains other than the root domain. Alternatively, if you want every subdomain to be protected, you can opt for a Wild Card SSL certificate.
You can consider any of the SSL certificates offered by the host BD. For more details contact us, we are happy to answer all your calls and queries 24/7/365.
