Find a certification that represents the skills you want to shore up. At a quick glance, Network+ from ComTIA might be a good one: http://certification.comptia.org/certifications/network

Then look into the training materials for such a certification even if your not planning on getting the certificate. Cisco training materials for some of their certifications include equipment, may be places near you to rent from to have hands on experience at home.

Another possibility is the numerous free college courses via services like iTunes U, or the paid services like Lynda.com (free for any Seattle Library Card holder, worth seeing if similar is available from your library).