Since you want to work in cisco in the computer networking domain, you should have good knowledge of computer networks and programming skills. Along with these a certificate on computer networks would be a plus point such as CCNA. CCNA is one of the most well known entry-level certifications within the IT industry; holding this credential proves your ability to install, configure, manage and support small to medium-sized networks. Once you clear the exam, you can now apply for cisco.
All the best!