Answer:
The correct answer is: 255.255.255.192.
Explanation:
A subnet mask complements an Internet Protocol (IP). Thanks to subnet masks IP addresses can be identified because they seem to be all the same but the subnet mask avoids confusion. If four subnets are to be created for the IP 192.168.90.0 3 bits of that IP must be used to create the subnet resulting in 255.255.255.192. Then:
- <em>Number of subnets</em>:

- <em>Number of hosts per subnet</em> =

Answer:
Sorry im not Vietnam so please explain it in English or ask someone who can speak Vietnam to help you
Answer:
Python is an object-oriented programming language that is designed to be accessible and simple for all users, HTML is a web language and is used globally to define the structure of web pages by using various tags. HTML is not a programming language it's a markup language which is used to formatting web pages. Python is a general purpose scripting language which can be used to develop a wide range of programs.