GUI (Graphical User Interface) Testing primarily focuses on the software's visual elements, ensuring that they adhere to design specifications. This includes validating button placements, color schemes, layouts, navigation, and other graphical elements to ensure a user-friendly and functional interface.

A UI/UX Tester primarily focuses on the usability, accessibility, and overall user experience of an application. They evaluate the interface, navigation, graphics, and overall user interaction with the software to ensure a seamless and intuitive experience.

"Loop Testing" is a white-box testing technique that specifically focuses on validating all loops in the software application. This ensures that loops function as expected under all possible conditions and iterations.

Stress Testing involves assessing the system under extreme conditions beyond its specifications. In scenarios where there's an unexpected surge in users, like company-wide events, it's vital to determine if the software can sustain the stress or if it breaks, thus helping in predicting and preventing potential crashes.

The Agile model of Software Development Life Cycle (SDLC) emphasizes continuous iterations of development and testing. Each iteration involves phases like requirements, design, coding, and testing.

Cloud-based mobile application testing offers scalable testing environments, meaning you can expand or reduce resources as per your testing needs. This scalability ensures flexibility and cost-effectiveness, allowing teams to test on multiple devices and configurations without the need for physical infrastructure, unlike traditional labs. Moreover, cloud-based testing isn't bound by geographic locations, ensuring wider test coverage.

Jenkins is a powerful and widely-used open-source tool that provides continuous integration and continuous delivery facilities for software development. Its extensive plugin system and integrations allow it to fit seamlessly into a DevOps environment, enabling automatic code integration, testing, and deployment processes.

A Test Environment Specialist or Test Environment Manager is primarily responsible for setting up, maintaining, and managing the test environments. This role ensures that the testing team has the necessary tools, software, and configurations to execute test cases effectively.

White-box testing, also known as Structural testing, emphasizes examining the internal structures and workings of an application. This is in contrast to black-box testing which focuses solely on the software's outputs in response to certain inputs, ignoring its internal mechanisms.

Connectivity testing is essential for apps that may function differently under various network conditions. In this case, the app's performance on mobile data versus Wi-Fi can be assessed under different conditions to ensure consistent user experience. Other testing types, while valuable, may not directly diagnose this specific issue.