[CCNA] CCNA1 - Chapter1

Intermediary devices

• Intermediary devices direct path of the data
• Intermediary devices connect individual hosts to the network
• Intermediary devices interconnect end devices.
• Examples of intermediary network devices are:
  • switches and wireless access points (network access)
  • routers (internetworking)
  • firewalls (security).

Which two connection options provide an always-on, high-bandwidth Internet connection to computers in a home office?

• DSL(domain specific language)
• cable

Which two Internet connection options do not require that physical cables be run to the building?

• cellular
• statellite

coverged network

• it delivers data, voice, and video over the same network infrastructure
• combines support for multimedia, telephone, and data on a single network

BYOD

• bring your own device
• 학교나 회사에서 개인 장비를 가지고 와서 사용하는 것을 말한다.
• 보안 문제가 있을 수 있다.

end devices on a network

1. The network devices that people are most familiar with are called end devices.
2. These devices form the interface between the human network and the underlying communication network. Some examples of end devices are:
   • Computers, laptops, file servers, web servers.
   • Network printers
   • VoIP phones
   • Security cameras
   • Mobile handheld devices.
3. End devices originate the data that flows through the network.

security goal

• ensuring confidentiality 기밀성 보장 : only the intended recipients can access and read the data
• maintaining integrity 무결정 유지 : the assurance that the information has not been altered during transmission
• ensuring availability 가용성 보장 : the assurance of timely and reliable access to data

internet conectivity type

• DSL : DSL is an always-on, high bandwidth connection that runs over telephone lines.
• Dialup telephone : Dialup telephone is much slower than either DSL or cable, but is the least expensive option for home users because it can use any telephone line and a simple modem.
• Statellite : Satellite requires a clear line of sight and is affected by trees and other obstructions.
• cable : Cable uses the same coaxial cable that carries television signals into the home to provide Internet access.

social media

• interactive websites where people create and share user-generated content with friends and family

powerline networking technology

• A device connects to an existing home LAN using an adapter and an existing electrical outlet.
• Powerline networking adds the ability to connect a device to the network using an adapter wherever there is an electrical outlet.​ The network uses existing electrical wiring to send data. It is not a replacement for physical cabling, but it can add functionality in places where wireless access points cannot be used or cannot reach devices.​

bandwidth

• a measure of the data carrying capacity of the media

 

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