A communal culture can give its members a sense of belonging and is also task-driven. Leaders of this culture are usually very inspirational and charismatic. The negative side is that they often have too much influence and members are rarely vocal.
In a networked culture members are as friends and family who have close contacts and care about each other. They are willing to help each other and share information. The negative side is that they are so close and kind to each other that they are reluctant to criticize the poor performance.
A mercenary culture focuses on strict goals. The goals should be met and the job done quickly. Everyone focuses on goals and objectivity. The negative side is that those with poor performance may be treated inhumanely.