Cisco ASA vs Let's Encrypt: What are the differences?

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1. Authentication Method: Cisco ASA requires authentication through usernames and passwords, while Let's Encrypt uses domain validation and keys for authentication.

2. Cost: Cisco ASA typically requires the purchase of hardware appliances and licenses, while Let's Encrypt provides free SSL/TLS certificates.

3. Legacy Support: Cisco ASA may be necessary for companies with existing infrastructure relying on Cisco technology, whereas Let's Encrypt is often favored for modern web applications.

4. Renewal Process: Cisco ASA certificates need to be manually renewed, whereas Let's Encrypt certificates automatically renew every 90 days.

5. Integration: Cisco ASA requires configuration and management within the Cisco ecosystem, while Let's Encrypt can easily integrate with various platforms and web servers.

6. Issuer Trust: Cisco ASA certificates are issued by internal Certificate Authorities (CA), whereas Let's Encrypt certificates are issued by a widely recognized CA that is included in most browsers' trust stores.

In Summary, Cisco ASA and Let's Encrypt differ in authentication method, cost, legacy support, renewal process, integration, and issuer trust.