[1강] 네트워크 디바이스

1강 이론

• A computer network is:
  • a digital telecommunincations network which allows nodes to share resources

• A client is:
  • a devide that accesses a service made available by a server
• A server is:
  • a device that provides functions or services for clients

• Switches:
  • have many network interfaces / ports for end hosts to connect to (casually 24+)
  • provide connectivity to hosts within the "same" LAN
  • do NOT provide connectivity between LANs / over the internet

•  Routers:
  • have fewer network interfaces than switches
  • are used to provide connectivity "between" LANs
  • are therefofre used to send data over the Internet
• Firewalls:
  • monitor and control network traffic based on configured rules
  • can be placed 'inside' the network, or 'outside' the network
  • are knwon as 'Next generation Firewalls' when they include more modern and advanced filtering capabilities
• Network firewalls:
  • are hardware devices that filter traffic between networks 
• Host-based firewalls:
  • are software applications that filter traffic entering and exiting a host machine, like a PC

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1강 QUIZ

키워드: can plug the 30 PCs in your department

c) A switch: LAN 안에서는 연결할 때 스위치가 필요합니다

 

키워드: received a video file from your friend's Apple IPhone

a) A server: 데이터를 제공받았으므로 서버입니다.

 

키워드: your computer or smartphone as / while you watch this video

c) A client: 데이터를 요청해 제공 받은 것이므로 클라이언트입니다

 

키워드: to connect its seperate networks together

d) A router: 네트워크 간 연결을 원한다면 라우터입니다

 

키워드: wants to upgrade its old network firewall / provides more advanced functions

c) A next-generation firewall: 이건 설명할 게 없네요

 

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1강 실습