A strong network is not just about having connections, but also having diversity within those connections (age-wise, gender-wise, experience level). A broad network means that people from various industries have heard about the work you do (or vice versa) and are interested in what it entails (or vice versa). A deep network means that there are relationships within this broad group; these people will be more likely to buy from or work with someone who has a personal connection as opposed to an acquaintance who happens to be in the same industry sector.