Lesson 3 - A Flashcards
What is a computer network?
it is two or more computers connected together and sharing data
What is OSI model?
The OSI model is a standard for communication between computers
what is OSI stand for?
(Open Systems Interconnection
What does Open source mean ?
Free, and we can modify
What are the parts of a computer?
hardware and software
What are the 3 big hardware of the computer
RAM, CPU, Harddrive
When we have a hardware, what will we need to put on it, to enable any user to use it?
OS (operating system)
What are some OS that exist?
mac, windows, …
What do you add on a OS in order to use a computer ?
applications
What are the 3 layers of a computer
OS, hardware, applications ( also call infrastructure)
What is the cloud provider?
Example of cloud provider?
Alibaba, oracle, GPC, digital OCEAN, Linode ..
What is the role of the load balancer ?
distribute traffic amount the server that are behind
What is the Linux kernel? The core
foundation of the OS
What is the common point among the Linux flavors?
They have the same kernel
What are the components of Linux?
shell, the kernel, the application, the libraries, the CLI …
What does CLI stand for?
Command Line Interface
What is the command you use to connect remotely to a Linux machine?
SSH Command
What does SSH stand for?
Secure shell
You can use ssh to connect to a server, located in China even if you are in France, true or false?
TRUE
What are the 2 differents ways to connect to a server?
username and password and user name and key pair
Why should we have to use a key to connect to a server with AWS?
security ( the password can be easily breakable by a hacker)
LAB: lunch a server and do an inventory:
- memory,
- OS,
- the size of memory is still available,
- when was the last time the server reboted?
- What is the cpu speed?
- How many hardrive do we have on it?
