Understanding Metropolitan Area Networks (MANs): Connecting Cities with High-Speed Connectivity

 MAN (Metropolitan Area Network)

A Metropolitan Area Network (MAN) is a computer network that spans a metropolitan area, such as a large city or a group of cities and towns. It is more significant than a Local Area Network (LAN) but smaller than a Wide Area Network (WAN).

Here are some key points about MANs:

• Coverage: MANs typically cover a range of 5 to 50 kilometers.
• Technology: To support data communication, they often use high-speed fiber optic cables and technologies like Ethernet, DWDM (Dense Wavelength Division Multiplexing), and IP (Internet Protocol).
• Applications: MANs connect multiple LANs within a city, provide high-speed internet access, and facilitate communication between government agencies, educational institutions, and businesses.
• Advantages: They offer high data transfer rates, improved network reliability, and efficient resource sharing across a metropolitan area.

LINUX CLI COMMANDS

Here are the Linux commands that you will need to know for the exam:

cd: change directory - Allows a user to change between directories

chmod: Changes the permissions on the files listed

chown: Allows you to change group & user of a file

cp: copy - Allows a user to make a copy of a file

grep: Search feature to look for a string of text

head: outputs the first 10 lines of a file

locate: this is the find command, used to locate a file

logger: writes input to the local system log or to a remote syslog server

ls: Shows the user a list of the files in the current directory

man: manual - Will show all the information about a particular command

mkdir: make directory - Allows a user to make a new folder or directory

mv: move - Allows a user to move a file to another directory or folder

passwd: changes the users' password

ps: Allows the user to see the processes running on the PC/Server

pwd: Allows a user to know the name of the directory in which they are located

rm: remove - This command allows a user to remove files within a directory

rmdir: remove directory: Allows a user to remove a folder or directory

tail: outputs the last 10 lines of a file