What is CCNA?

CCNA is an IT exam, which belongs to one of the certifications issued by Cisco Company in the United States.

Cisco is a global leader in Internet devices and solutions. His certification system has been promoted around the world for more than 20 years. In the field of network engineers, certification changes are the most recognized in the world, and certificates are very effective both internationally and domestically. It is also helpful to emigrate.

The cisco certified system in the United States is divided into: entry-assistant-senior-expert-architecture; In other words, CCENT, CCNA, CCNP, CCIE and CCA are five levels. (Excerpted from Cisco official)

Each level is divided into different directions. For example, CCNA can be subdivided into: routing and switching directions; Safe direction; Voice direction; Wireless direction; Data center direction; Design direction; Operator direction; Operation and maintenance instruction (from Cisco official)

The content of the exam is determined by Cisco officials and will be updated regularly (once a year on average, rarely. Because there are too many people taking the exam in China, the examination questions are leaked seriously)

Unless otherwise specified, in general, CCNA refers to the direction of route switching. In short, the content is as follows:

Network model and protocol

Principles of data analysis and communication

Address planning

Exchange principle

virtual local area network

Double redundancy

Routing principle

Routing protocol

Wide area network access

Internet access

access control

Basic security

Introduction to wireless

Introduction to IPv6

Brief introduction of virtual private network

IP service

The exam is as follows (from Cisco official website)

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