Networking is the process of making connections and building relationships that provide you with information, advice, and further contacts, all of which will enhance your ability to make informed career decisions and tap into unadvertised internship/job vacancies. Networking can take place in a group or one-on-one setting.
An entry visa in your passport is relevant ONLY to your eligibility to be admitted to the U.S., not for remaining in the U.S. What matters while you are in the United States is maintaining your F-1 status for the duration of your academic program as reflected on your I-20. If your entry visa expires while you are in the U.S. you will have to obtain a valid one before re-entering the U.S. from a trip abroad. You cannot renew a visa in the U.S. but will have to apply for a new one at a U.S. consulate abroad, most likely in your home country.
If you are leaving the U.S. during your program of study, you need an unexpired passport, unexpired F-1 entry visa, and an I-20 which has a travel signature obtained from the International Students and Scholars Office (ISSO) on page 3 that is less than 12 months old at the time that you return. Please read Travel and Re-entry in F-1 Status for more information.
The two most important requirements are to remain registered full-time every term, making normal progress toward your degree, and not to accept any employment, either on- or off-campus, without written permission from the ISSO, and, if necessary, authorization from the Department of Homeland Security (DHS). Be familiar with the information in Maintaining F-1 status. Under certain conditions status may be reinstated if lost for reasons beyond your control. You may also regain status by leaving the U.S.