This time, me myself Alvin Reza and my friend Risyad Ridho will review about one video which is interested from Youtube called “Networking” from Youtuber named “Eli the Computer Guy”. In this video which have a duration 57 minutes 38 seconds, we will learn about how computer connect to the internet, internet devices such as : router, firewall, VPN, switches, wireless access points, cables, etc.
URL : https://www.youtube.com/watch?v=rL8RSFQG8do&t=58s
Modem is the first device that will connect you to internet. Router connected to the modem, it doesn’t have high cpu or gpu specification but this device does networking very well. It allows computer on the internal network to talk to each other and also allow computers to connect to the internet. Underneath the router, there is device called firewall, it is the protective device provide the protection from hacker. Switch is splitter of the internet signal. Computer connects to switch, then switch will either allow to communicate to each other or to the internet. Basic diagram of how networking connects together and looks : Computer -> Switch -> firewall -> router -> modem. Devices explanation will be explained after this.
There are 2 types of networking ; Physical and Logical Networking, which Within the computer world, they are very different.
- Physical Networking
Computer connects physically through network cable, switcher, router, etc.
- Logical Networking
Even physically computer connect each other through switch, but sometimes logically they aren’t connected to each other because of the switch
Device that connects network to the internet
- Modem
First device that connects the computer to the internet with other devices help. Can be either for T1 connection, cable connection, DSL, legally satellite internet connection. Turns your internet signal, protocol, language that used on your internal network into the language that can be used into the internet.
- Routers
Allows you to separate diff networks. Sharing internet connection. Some way to separate, no hacking each other. Internet connection split out from the modem, tenant have their own router. Can’t get into others router. Logically to divide network for multiple users.
- Firewall
Underneath router is firewall, device that tries to prevent hackers from being able to get into your network through the internet. Part of security function, it will affect the entire network and may have some unintended consequences, if its on, it will block internet services for the entire network.
- Switches
Device that connects all of the devices on the network together to allow them to “talk” to each other. Diff hubs and switches basically hubs split the internet signal for the network signal to everybody equally, it’s like a complicated cable splitter. Switches understand how to transfer data properly, so the network will run efficiently. Computer plugs into these ports, connects to router and so on. Can afford to connect more than 1000 computers which is very expensive.
There are 2 types of switches : Unmanaged and Managed Switches
- Unmanaged Switches is absolutely automatic which means we can’t configure anything on the switch, so we only hope that the switch will do what it’s supposed to do.
- Managed Switches is more complicated, because it allow you to program the switch to do certain things and make it do properly, allows you to play and change settings with things like quality of service and other high - level networking stuff.
- VPN (Virtual Private Network)
Allows computer anywhere in the world to connect to someone internal network and as far as the computers and networking devices are concerned that computer is now inside his / her network. They able to access it but a lot more slowly because the internal network works at least a hundred megabytes which is pretty fast, but for the person which go through the internet, it depends on internet speed and problems at that moment that can take things get very slow.
To be safe, the internal network use username and password which be informed to the client for them to connect to internal network. It will authenticate and then as long as it’s okay, VPN point will then allow the computer to be on the network.
- Wireless Access Points
Device that allows wireless computers and devices to connect to the network. It doesn’t really matter to have antenna or not. All computers wirelessly connect to them, and they have to plug 1 cable into the switch which allow the wireless device can communicate with wired devices and wired devices can communicate with a wireless device through WAP.
4 standards WAP:
- 802.11 a | < 10 years ago
- 802.11 b | 10 years ago
- 802.11 g | 7 years ago
- 802.11 n | 3 years ago
In this video, I learn so many interesting things that I didn’t know before. I like how Eli explained to us, from the contents until the examples of each cases. He talks clearly and well prepared, so we can easily understand what he tries to say.
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