CompTIA CV0-003 Online Access

Containers are a solution that offers isolation, portability, and scalability for software development and deployment. Containers are lightweight and self-contained units of software that package up the application code and all its dependencies, such as libraries, frameworks, and configuration files. Containers run on a container platform, such as Docker or Kubernetes, that provides the runtime environment and orchestration for the containers.

Containers offer isolation, as they run independently from each other and from the underlying host system. Each container has its own namespace, filesystem, network, and resources, and does not interfere with other containers or processes. Containers also offer portability, as they can run on any system that supports the container platform, regardless of the hardware or operating system differences. Containers can be easily moved, copied, or deployed across different environments, such as development, testing, or production. Containers also offer scalability, as they can be dynamically created, destroyed, or replicated to meet the changing demand for the application. Containers can also leverage the distributed computing power of clusters, which are groups of servers that work together to provide high availability and performance .

To allow communication between the on-premises and cloud subnets, the firewall traffic should be allowed to pass through the additional subnet for communication, which is 192.168.5.0/24. This subnet acts as a bridge between the two networks and should have firewall rules that permit traffic from and to both sides.

References: [CompTIA Cloud+ Study Guide], page 181.

The correct answer is C and D.

C. Fix the file permissions with read-only access to the owner of the file.

D. Open port 22 access for the computer’s public IP address.

The authorized_keys file on the server should have read-only access for the owner of the file, and no access for anyone else. This ensures that only the owner can read the public keys that are authorized to log in, and no one can modify or delete them. The file permissions can be fixed with the command chmod 400 ~/.ssh/authorized_keys on the server. This is a recommended security practice for SSH key-based authentication123.

The computer that wants to log in to the server using SSH key-based authentication needs to have access to port 22 on the server, which is the default port for SSH service. This can be done by opening port 22 access for the computer’s public IP address on the server’s firewall or security group settings. This allows the computer to initiate an SSH connection to the server and authenticate with its private key. Opening port 21, which is used for FTP service, is not relevant or secure for SSH key-based authentication1.

A disaster recovery (DR) solution is a set of policies, procedures, and tools that enable an organization to restore or continue its critical functions in the event of a natural or human-induced disaster. A DR solution for the application between different data centers means that the application is replicated or backed up to another location that is geographically separated from the primary data center. This way, if the primary data center becomes unavailable due to a power outage, fire, flood, cyberattack, or any other cause, the application can be switched over to the secondary data center and resume its operations with minimal downtime and data loss. This solution ensures business continuity and high availability for the application and its users. References: CompTIA Cloud+ CV0-003 Study Guide, Chapter 5: Maintaining a Cloud Environment, page 221-222; Disaster recovery planning guide.