Jaringan nirkabel (Inggris: wireless network) adalah bidang disiplin yang berkaitan dengan komunikasi antar sistem komputer tanpa menggunakan kabel. Jaringan nirkabel ini sering dipakai untuk jaringan komputer baik pada jarak yang dekat (beberapa meter, memakai alat/pemancar bluetooth) maupun pada jarak jauh (lewat satelit). Bidang ini erat hubungannya dengan bidang telekomunikasi, teknologi informasi, dan teknik komputer. Jenis jaringan yang populer dalam kategori jaringan nirkabel ini meliputi: Jaringan kawasan lokal nirkabel (wireless LAN/WLAN), dan Wi-Fi. Jaringan nirkabel biasanya menghubungkan satu sistem komputer dengan sistem yang lain dengan menggunakan beberapa macam media transmisi tanpa kabel, seperti: gelombang radio, gelombang mikro, maupun cahaya infra merah.

Pada tahun 1970 Norman Abramson, seorang profesor di University of Hawaii, mengembangkan komputer pertama di dunia jaringan komunikasi, ALOHAnet, menggunakan biaya rendah seperti ham-radio. Dengan bi-directional topologi bintang, sistem komputer yang terhubung tujuh ditempatkan lebih dari empat pulau untuk berkomunikasi dengan komputer pusat di Pulau Oahu tanpa menggunakan saluran telepon.

"Pada tahun 1979, FR Gfeller dan U. Bapst menerbitkan makalah di Proceedings IEEE pelaporan percobaan jaringan area lokal nirkabel menggunakan komunikasi infra merah disebarkan. Tak lama kemudian, pada tahun 1980, P. Ferrert melaporkan percobaan penerapan kode satu radio spread spectrum untuk komunikasi di terminal nirkabel IEEE Konferensi Telekomunikasi Nasional. Pada tahun 1984, perbandingan antara infra merah dan CDMA spread spectrum untuk komunikasi jaringan informasi kantor nirkabel diterbitkan oleh IEEE Kaveh Pahlavan di Jaringan Komputer Simposium yang muncul kemudian dalam IEEE Communication Society Magazine. Pada bulan Mei 1985, upaya Marcus memimpin FCC untuk mengumumkan ISM band eksperimental untuk aplikasi komersial teknologi spread spectrum. Belakangan, M. Kavehrad melaporkan percobaan sistem PBX nirkabel kode menggunakan Division Multiple Access. Upaya-upaya ini mendorong kegiatan industri yang signifikan dalam pengembangan dari generasi baru dari jaringan area lokal nirkabel dan diperbarui beberapa lama diskusi di radio portabel dan mobile industri.

Generasi pertama dari modem data nirkabel dikembangkan pada awal 1980-an oleh operator radio amatir, yang sering disebut sebagai radio paket ini. Mereka menambahkan komunikasi data pita suara modem, dengan kecepatan data di bawah 9.600-bit / s, untuk yang sudah ada sistem radio jarak pendek, biasanya dalam dua meter band amatir. Generasi kedua modem nirkabel dikembangkan FCC segera setelah pengumuman di band eksperimental untuk non-militer penggunaan spektrum penyebaran teknologi. Modem ini memiliki kecepatan data yang diberikan atas perintah ratusan kbit / s. Generasi ketiga modem nirkabel ditujukan untuk kompatibilitas dengan LAN yang ada dengan data tingkat atas perintah Mbit / s. Beberapa perusahaan yang mengembangkan produk-produk generasi ketiga dengan kecepatan data di atas 1 Mbit / s dan beberapa produk sudah diumumkan oleh waktu pertama IEEE Workshop on Wireless LAN.

Adapun jaringan nirkabel dalam bidang sensor atau biasa disebut Jaringan Sensor Nirkabel (Wireless Sensor Network/WSN). Jaringan sensor nirkabel adalah jaringan perangkat nirkabel yang saling berhubungan yang tertanam dalam lingkungan fisik untuk mengukur kondisi lingkungan seperti suhu, suara, tingkat polusi, kelembapan, angin, dan sebagainya.

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The installation of the Local Area Network (LAN)

The chance of this post I try to give something to friends who might be on the enlightenment that I have to say here, many are already familiar with or even go into what I would post this time, something which I will post this time talking about the installation of Local Area Network (LAN). I emphasize on some of the discussion below :

1. Explaining the network hardware and their functions.
2. Explains IP addressing Address.
3. Calculate IP addressing and Subnet Address IP Address.
4. Explain the network topology.
5. Topology design specifications required.

Network hardware can be broadly at the start of the computer itself to the device used to endorse a global network. As an example of network hardware that is inside the computer is NIIC or Network Interface Card. NIC is also referred to as LAN Card, LAN Card name is more popular than NIC.

NIC or LAND Card

Out of the NIC is generally connecting it with the switch that is used together with another computer.

Switch

Router

If the computer networks connected to different networks, It would require a router device. To protect and secure the network are the Firewall, Proxy server. Besides, the partners are still referred to as a bridge network, wireless router, access point, and so forth.

Each network device requires an IP Address, IP Address There are two types of IPv4 and IPv6, which is commonly used IPv4. IP Address IPv4 version consists of 4 groups of 8-bit binary number is converted to a decimal number that is easy to understand.

Biner	Decimal
00000000	0
11111111	255

IP address is divided into five classes, Class A, Class B, Class C, Class D, Class E, but in actual classes used to provide IP address is class A, Class B, Class C.

Class	Biner	Decimal
A	0000 0001.X.Y.Z to 0111 1111.X.Y.Z	1.X.Y.Z to 127.X.Y.Z
B	1000 0000.X.Y.Z to 1011 1111.X.Y.Z	128.X.Y.Z to 191.X.Y.Z
C	1100 0000.X.Y.Z to 1101 1111.X.Y.Z	192.X.Y.Z to 223.X.Y.Z

Each class has a public IP for the benefit of local interests

Class	IP Local
A	10.    0.0.0 to   10.255.255.255
B	172.  16.0.0 to 172.  31.255.255
C	192.168.0.0 to 192.168.255.255

Class A has a special IP address that has been allocated for testing the network, which is 127.0.0.0
Write the IP address error will cause the appearance of error messages, for example if address 127.0.0.0 IP address to NIC.

Error message when one writes the IP address

Each class has an IP subnet mask to determine the network number and host and user.

Class	Subnet Mask (Default)
A	1111 1111.0000 0000.0000 0000.0000 0000 or 255.0.0.0
B	1111 1111.1111 1111.0000 0000.0000 0000 or 255.255.0.0
C	1111 1111.1111 1111.1111 1111.0000 0000 or 255.255.255.0

As an example of a class C IP address local: 192.168.0.1 with a subnet mask of 255.255.255.0

a number of binary subnet mask = 24, so the IP address 192.168.0.1/24 could be written as a binary number 0 is equal to 8 pieces, then the IP address 192.168.0.1 has a kind friend as much as 2⁸ = 256, that is : 192.168.0.0 to 192.168. 0.255

192.168.0.0 Cannot be used as an IP address for the network, while 192.168.0.255 is the IP address for the broadcast. So the effective number of IP addresses only 256-2 = 254.

Than 1111 111.1111 1111 .1111 1111.0000 0000 can also be 1111 111.1111 1111 .1111 1111.1000 0000 or 1111 111.1111 1111 .1111 1111.1100 0000

Subnet Mask 1111 1111.1111 1111.1111 1111.1100 0000 Have a number of binary 1 = 26 and the number of binary 0 = 26

So for the same IP address 192.168.0.1/26, subnet mask of 255.255.255.192.
Binary 1 at the end of = 2 and a binary 0 = 6
binary 1 indicates the number of network = 2² = 4
Binary 0 indicates the host for each network = 2⁶ = 64
IP Address in the table it can be:

IP Address	function
192.168.0.0	Network 1
192.168.0.1 to 192.168.0.62	User 1
192.168.0.63	Broadcast 1
192.168.0.64	Network 2
192.168.0.65 to 192.168.0.126	User 2
192.168.0.127	Broadcast 2
192.168.0.128	Network 3
192.168.0.129 to 192.168.0.61	User 3
192.168.0.191	Broadcast 3
192.168.0.192	Network 4
192.168.0.193 to 192.168.0.254	User 4
192.168.0.255	Broadcast 4

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Cisco Internetwork Operating System Support for PC problems

Cisco Systems is a pioneer in the design and development of devices for the networking, communications, speech, and consumer electronics. Internetwork Operating System (IOS) is a software for its hardware from Cisco Systems developed. It performs telecommunications switching, routing and network functions tightly integrated with an operating system multithreading. Command Line Interface (CLI) is used for human-computer interaction. A fixed set of multiple commands in Word, which is determined by the operation and user will be provided by Cisco. It also provides technical support for IOS problems.

Microprocessors used by IOS

Most systems use Cisco hardware performance microprocessors and various capacities, depending on the hardware platform. Orion R4600 and Motorola 68030 processors are the most commonly-used. Make decisions to keep routing and bridging, routing tables and the use of system management functions are the main functions of the IOS. For these functions, the microprocessor is to access the system memory. Mapping system memory must be performed by an experienced PC support provider.

Types of memory cards required for IOS

There are four types of system memory by IOS used, read-only memory that is, the random access memory, flash memory and non-volatile random access memory. Each of these memories for various purposes.

Read Only Memory (ROM)

ROM or can be integrated into the microprocessor itself or separate from the microprocessor on the system board. As the name implies, the data can be read from this type of memory, not written. Stored in the ROM IOS software is called when the device is started. The ROM size must be from a service provider based on the size of the IOS version to be decided.

Random Access Memory (RAM)

RAM is the type whose content only when it is activated in the Reserve. The main goal of the RAM for storing data is used by application software. In hardware systems, Cisco IOS system keeps RAM buffers and tables for corporate storage needs.

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Make Wireless in your home

You have several computers in the house and you want all computers are connected in a small network. Actually there are 2 ways to dial, the first is to use a cable, and that both wirelessly. Which will be discussed here is the wireless connection, because the connection using a cable is less desirable because the need for long cables as well as in terms of aesthetics that are less attractive.

For simplicity, the discussion will be divided form the 4 categories namely, preparation equipment, connect the modem to the router, network settings, and the last is a computer connected to the network wirelessly. Let us begin.

Preparation Tools
the device should be prepared in advance is a cable modem, wireless router, as well as several wireless receivers for computers that need it

Cable modems function as a bridge between your internet service providers. In Indonesia, most services are Firstmedia worth it, despite numerous complaints about poor customer service professional. But if your area is not covered by these services you may be considering using IndosatM2 cable Internet service.

Wireless Router functions for connecting and providing Internet access to all computer or laptop that is connected to the appliance. Some activities that can be done if it is connected to the tool it is, sharing documents between computers, as well as streaming video and audio.

Wireless receiver functions to capture the wireless signal are transmitted by the wireless router. Usually installed on your computer (PC) using a USB or PCI card. But if you use a laptop, usually do not need this tool, because it has a built-in.

Connect the modem and router

We assume you have subscribed to one of the services mentioned above (First media or IndosatM2), it is time you plug your modem into your wireless router using an Ethernet cable (usually included the purchase of this cable modem). Please note in connecting to the router, not to the wrong port. Usually written to modem connection (Internet / WAN) as shown in the picture below (in green)

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How to write to attract new visitors to your blog

Everyone seems to be millions of viewers in its efforts to reverse the blog, SEO and the use of social networks. But their products in a way that attracts people to write? Likely to focus on your website or blog lost somewhere in the early stages of development, when the traffic is reduced or even disappeared. A blog is a fascinating and thought he could make money blogging is even more exciting. It 's important not to confuse, but lost! Optimizing blog visual presentation and the structure of Google AdSense is important, but the blog content is more important than ever.

Here are some tips to keep in mind when writing.
    

* Make your way to an interesting article! Nobody wants to read a good selection of stuff to death by other bloggers, but if you're creative, short-term securities for the admission of visitors, may trigger a new light on the subject. Just as the blog title is important for visitors to Google Pack, tickets are also an important article. Just because the players on this site does not mean that they are indifferent, especially when they see what they are.

* Organize your items with a bold, dots, dashes, and bullets! If read, the more likely it is to read. This concept is very simple. Grease to remove part of his article for readers. Use promotion to kick their scanner with the contents of the article.

* Having a little article! If I'm on your blog and see what items like books, I leave a sigh. Readers have a juicy bit 'faster. When the content sections in more than 700 words to attract readers will have a strong desire to do before sitting down to read.

* Communicate with your readers! Written comments are right. Readers not only with other guests, but also interact with the author. It 'also a good source of new blog topics.

* Correction Read the article! It may be the most amazing writer in the world, but if the whole article in spelling and grammar, then laughed. These errors will only restore the madness of the readers and let them leave your site faster.

In Conclusion

Here are some ways to increase traffic is best for you. Please note that the content of the blog's saving grace or road to destruction. Make sure that the niche that you write very well. Take your time and do things slowly, and you'll be well on our way to make money blogging.

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Protocol in the network

The protocol is a rule or method of how data communications performed among several computers on a network, the rules include guidelines that apply to the ways and methods to access a network, physical topology, the types of cable and data transfer speeds. Many computer communication protocols have been developed to form a computer network. competition between computer companies such as DEC, IBM etc. The issue of standard computer network. this causes difficulty, especially if it will be inter-connections between various types of computers in a wide area. on the occasion of this post I will discuss 3 common prorokol the most frequently used is Ethernet, Local Talk and Token Ring.

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Network Topology

I would like to post about computers: D, a few days ago my friend asked me what definition of Computer Network Topology, at that moment I did not answer directly but I ordered read the article on my website, ok brief network topology is the physical description of the pattern relationship between network components that includes the server workstation, hub and cabling

Computer networks have some topography that you need to know the advantages and disadvantages of each of its features, some topography that are available are:

1. Topology BUS
2. Topology Star 
3. Topology Ring 

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Watch YouTube Without Buffering !!

This is the new trick from me : )
I have collect all the possible way to speed up youtube until almost without buffering  : P
Ok, lets start... I have divided it into 4 way..



1. Using Speedbit Video Accelerator v. 3.1.3.6

Come on download it here : http://www.videoaccelerator.com/download/
Then after you download, you should check which website that support on this software.
You can check it here : http://www.videoaccelerator.com/support/videosites/

2. Using Greasemonkey Script (Firefox user)

• If you don't have this addons, you can download it here : https://addons.mozilla.org/en-US/firefox/addon/748
• Then, you must come to this site : http://userscripts.org/scripts/show/33042 and install the 'Youtube Enhancer' script there. (just click the install button there)
• Then, if someday the 'Youtube Enhancer' script has an update, you must install this script too : http://userscripts.org/scripts/show/26062 . 
• Open video on youtube for testing.. If you have install all stuff above correctly, then in the bottom of the video that you wanna watch there is a text View In very low quality (flv), click it. You can resize the video, then there is a 'skull' pic to stop the buffer and a light button to make the background dark. BUT REMEMBER !! YOU SHOULD TO CLICK View In very low quality (flv) TO SPEED UP THE BUFFERING PROCESS.
• But, if you have a good connection, you can change it to high quality or medium quality : P

3. Using Google DNS      

Purpose : To accelerate the youtube ping to our computer. ( tested and works )
How to :

• Open Control Panel
• Then Network Connection
• Then Local Area Network ( Double click LAN that is connected to us)
• Click Properties
• Double click TCP/IP
• Click " Use the Following DNS address"
• Enter the preferred : 8.8.8.8    ----    Enter Alternate : 8.8.4.4
• CONGRATULATION!!!!! --> just compare it before and after you use the google DNS ^^

4. Using Youtube Feather Beta

This is the new way. I got this way from my friend and it works, this is unbelievable i think. The purpose using this is to accelerate the ping of youtube to our computer (same with google dns).

How to :

• First you mustopen this page : http://www.youtube.com/feather_beta
• Click "Join the 'Feather' Beta"
• Check if the 'Feather' Beta works or not by watching this video : http://www.youtube.com/watch?v=QjA5faZF1A8&fmt=5 ( J.Cannon with Cannon Rock haahah i love this )
• If its work then you should see in the right sidebar a green box like this : " You are currently in the "Feather" beta "

P.S : I have checked on this and not all the video we can watch with this way : (


Thats all for now guys, i hope it can help you :)
And if there is another way i get, i will update here...
: D

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