CCNA R&S: Introduction to Networks CCNA Routing & Switching Curriculum CCNA R&S: Introduction to Networks (ITN) is a Cisco academic course which covers networking architecture, structure, and functions. The course introduces the principles and structure of IP addressing and the fundamentals of Ethernet concepts, media, and operations. The duration of the course is 70 hours, includes … Continue reading CCNA R&S: Introduction to Networks