What term refers to a short-term network used to meet an objective?

The term that best describes a short-term network formed to achieve a specific objective is a task force. A task force is typically assembled to address a particular issue or project and usually consists of individuals with the necessary skills and expertise to tackle the task at hand. Once the goal is accomplished, the group is disbanded.

Coalitions and alliances often refer to broader and more enduring partnerships that may involve ongoing relationships beyond a single objective, while standing committees are more permanent structures within organizations designed to address ongoing issues rather than specific, time-limited tasks. Hence, the focus of a task force on achieving a particular goal in a temporary period distinguishes it clearly as the correct answer.