思科认证体系是一个层级化的认证系统，涵盖了从基础到专业水平的多个认证级别。

以下是思科认证体系的基本结构：

 入门级（Entry Level）: Cisco Certified Technician (CCT) 

助理级（Associate Level）: Cisco Certified CyberOps Associate Cisco Certified DevNet Associate Cisco Certified Network Associate (CCNA) 专业级（Professional Level）: 

Cisco Certified CyberOps Professional 

Cisco Certified DevNet Professional 

Cisco Certified Design Associate (CCDA) 

Cisco Certified Design Professional (CCDP) 

Cisco Certified Routing and Switching Professional (CCNP R&S) 

Cisco Certified Wireless Professional (CCNP Wireless) 

Cisco Certified Collaboration Professional (CCNP Collaboration) 

Cisco Certified Security Professional (CCNP Security) 

Cisco Certified Service Provider Professional (CCNP Service Provider) 

Cisco Certified Data Center Professional (CCNP Data Center)

 Cisco Certified Industrial Networking Professional (CCNP Industrial) 

专家级（Expert Level）: 

Cisco Certified Internetwork Expert (CCIE)

CCIE Collaboration 

CCIE Data Center 

CCIE Enterprise Infrastructure 

CCIE Enterprise Wireless 

CCIE Security 

CCIE Service Provider 

架构师级（Architect Level）: Cisco Certified Architect (CCAr) 

每个级别都代表了一定水平的技术专长和经验要求。随着级别的升高，认证的难度和专业性也会相应增加。这个体系允许专业人员在自己的领域内取得相应的认证，从而在职业发展中取得更高的成就。