OpenSSH vs Zscaler: What are the differences?

### Introduction 
OpenSSH and Zscaler are two popular security solutions used in the networking industry. In this comparison, we will highlight the key differences between OpenSSH and Zscaler.

### 1. Authentication Mechanism: 
OpenSSH relies on public key cryptography for authentication, ensuring secure communication between the client and server. On the other hand, Zscaler uses cloud-based authentication mechanisms to verify user identities before allowing network access.

### 2. Deployment Flexibility: 
OpenSSH can be deployed on various operating systems, making it a versatile choice for organizations with diverse infrastructure. In contrast, Zscaler is a cloud-native security solution, providing centralized and scalable protection for users regardless of their location.

### 3. Tunneling Capabilities: 
OpenSSH enables secure tunneling for network connections through encrypted channels, allowing users to access remote resources securely. In contrast, Zscaler includes built-in tunneling capabilities to securely route traffic through its global network of data centers, ensuring protection against external threats.

### 4. Protocol Support: 
OpenSSH supports commonly used protocols like SSH, SFTP, and SCP, offering a comprehensive set of security features for secure file transfer and remote access. In comparison, Zscaler supports a wider range of protocols, including HTTP, HTTPS, and other application-specific protocols, providing extensive security for various networking applications.

### 5. Scalability and Performance: 
OpenSSH is suitable for small to medium-sized deployments, offering reliable performance for a limited number of users. Zscaler, with its cloud-based architecture, provides high scalability and performance capabilities, making it ideal for large enterprises with high traffic volumes and geographically dispersed users.

### 6. Maintenance and Updates: 
OpenSSH requires manual maintenance and updates by system administrators to ensure the latest security patches and features are implemented. Conversely, Zscaler offers automatic updates and maintenance through its cloud-based platform, reducing the burden on IT teams and ensuring continuous protection against evolving threats.

In Summary, OpenSSH and Zscaler differ in authentication mechanisms, deployment flexibility, tunneling capabilities, protocol support, scalability and performance, as well as maintenance and update processes.