There are a range of networking and computer network related certifications that will enable you to learn and validate your knowledge in the field of networking.
If you are looking to learn about computer networking basics then you should start with a Cisco Certified Network Associate (CCNA) or CompTIA A+ or Network+ certifications, these will put you in a good position to move up to intermediate networking qualifications such as Cisco's Certified Network Professional (CCNP).
However you might like to consider specializing in an area of networking, such as security, voice or wireless. There are specialized certifications for these areas of expertise including Cisco's CCNA wireless, CCNA voice or CCNA security. CompTIA also provide specialized certification paths including Security+ certification.
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