Knowing how to build your network is crucial, but knowing how to tap into your network for help is even more important. After all, if you can't get the help you need for yourself or for others from the people you know, where will you get it?
Some people are reluctant to ask for help out of fear of looking helpless or a fear of rejection. But giving help is actually very natural. As Daniel Goleman wrote in Social Intelligence, "Our brain has been preset for kindness. We automatically go to the aid of a child who is screaming in terror; we automatically hug a smiling baby. Such emotional impulses...elicit reactions in us that are unpremeditated and instantaneous."
So when someone sees us in need at a primal level, they react automatically to ease our suffering. With a higher-order need like finding a job, however, we're less likely to get help for it by screaming like a five-year old.
The art of the ask
Asking for help can be tricky because when someone isn't able to deliver on your request, it can cause negative feelings on both sides. On the other hand, asking for something that can be fulfilled creates positive feelings, which then strengthens the relationship and sets up an environment for more help to flow in the future.
The key is to think "relationship" rather than "transaction" and put more thought into how the other person feels instead of what you immediately need.
Four things to consider
Here are four things to consider when asking your network for help:

Ask for something easy to give. It's easier for someone to give you advice on how to position yourself for a job than it is to give you a job since few people have unfilled positions in their back pocket just waiting to hand over to you. However, most folks do love to share insights and experiences, and talking about things they've done takes little effort. It does take time, though, so keep the time request small as well. You'll get more contacts to agree to a 15-minute phone chat than a two-hour lunch meeting even if you offer to pick up the tab.
Take the pressure off. You never want people to feel badly about not being able to help you, which could hurt the relationship in the long run. Instead, always include a pressure-release valve with every request by saying something like, "I know you're very busy, so if you're not able to do this, I completely understand." Or phrase your request differently by saying, "If you feel comfortable introducing me to John, I'd appreciate it," rather than, "Can you introduce me to John tomorrow?"

Smart networkers excel at getting the help they need from their contacts when they need it. They think carefully about who to ask and what to ask for. More importantly, they ask for help in a way that contributes to, rather than detracts from, the health of the relationship. Keeping that connection intact helps ensure that contact will be there in the future, long after this immediate need has passed.

Good article, it is amazing how many people would really change their results if they read this article and used the information.
Ray