Rabu, Februari 22, 2012

Percepat Koneksi Modem

Buat agan2, mas n mbak2 yang punya koneksi modemnya lambat, g usah kawatir. Saya akan kasi tau caranya, yaitu, salah satunya adalah ganti DNS default modem anda.

Bagaimana cara ganti Setting DNS itu??
Untuk mengganti DNSnya silahkan buat koneksi baru buat koneksi dial up..

    Buka control panel
    Pikih Network connections
    Pilih new connection wizard
    nex/connect to internet
    pilih Set up my connection manually
    connect using manualy modem ( pastiin driver modem udah diinstal ya)
    ISP Name (isi terserah aja)
    phone number isi *99#
    user name isi 3data
    password isi 3data
    nex / centang Add a shortcut to this connection to my desktop (untuk menampilkan shortcut di desktop)
    selesai seting dial up

Sekarang ganti DNS nya

    buka koneksi yang baru dibuat tadi
    pilih properties
    pilih networking
    klik internet protokol (TCP / IP) / klik properties
    pilih use the following DNS server addresses
    Silahkan isi dengan DNS mana yang lebih cepat
    DNS google 8.8.8.8
    open DNS    208.67.222.222

Atau bisa juga dengan menggunakan software untuk mengukur kecepatan DNS dan Mendapatkan DNS yang paling Cepat Download software nya DISINI
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Jumat, Mei 20, 2011

Macam - Macam Jaringan Komputer


Jaringan komputer adalah sebuah kumpulan komputer, printer dan peralatan lainnya yang terhubung. Informasi dan data bergerak melalui kabel-kabel sehingga memungkinkan pengguna jaringan komputer dapat saling bertukar dokumen dan data, mencetak pada printer yang sama dan bersama sama menggunakan hardware/software yang terhubung dengan jaringan. Tiap komputer, printer atau periferal yang terhubung dengan jaringan disebut node. Sebuah jaringan komputer dapat memiliki dua, puluhan, ribuan atau bahkan jutaan node. Sebuah jaringan biasanya terdiri dari 2 atau lebih komputer yang saling berhubungan diantara satu dengan yang lain, dan saling berbagi sumber daya misalnya CDROM, Printer, pertukaran file, atau memungkinkan untuk saling berkomunikasi secara elektronik. Komputer yang terhubung tersebut, dimungkinkan berhubungan dengan media kabel, saluran telepon, gelombang radio, satelit, atau sinar infra merah.
Jenis-Jenis jaringan berdasarkan jangkauan :
Ada 3 macam jenis Jaringan/Network yaitu : 
  1.  Local Area Network (LAN) /Jaringan Area Lokal
Sebuah LAN, adalah jaringan yang dibatasi oleh area yang relative kecil, umumnya dibatasi oleh area lingkungan seperti sebuah perkantoran di sebuah gedung, atau sebuah sekolah, dan biasanya tidak jauh dari sekitar 1 km persegi. Beberapa model konfigurasi LAN, satu komputer biasanya di jadikan sebuah file server. Yang mana digunakan untuk menyimpan perangkat lunak (software) yang mengatur aktifitas jaringan, ataupun sebagai perangkat lunak yang dapat digunakan oleh komputer-komputer yang terhubung ke dalam network. Komputer-komputer yang terhubung ke dalam jaringan (network) itu biasanya disebut dengan workstation. Biasanya kemampuan workstation lebih di bawah dari file server dan mempunyai aplikasi lain di dalam harddisknya selain aplikasi untuk jaringan. Kebanyakan LAN menggunakan media kabel untuk menghubungkan antara satu komputer dengan komputer lainnya.
  1. Metropolitan Area Network (MAN) / Jaringan area Metropolitan
Sebuah MAN, biasanya meliputi area yang lebih besar dari LAN, misalnya antar wilayah dalam satu propinsi. Dalam hal ini jaringan menghubungkan beberapa buah jaringan-jaringan kecil ke dalam lingkungan area yang lebih besar, sebagai contoh yaitu : jaringan Bank dimana beberapa kantor cabang sebuah Bank di dalam sebuah kota besar dihubungkan antara satu dengan lainnya. Misalnya Bank BNI yang ada di seluruh wilayah Ujung Pandang atau Surabaya.
  1. Wide Area Network (WAN) / Jaringan area Skala Besar
 Wide Area Networks (WAN) adalah jaringan yang lingkupnya biasanya sudah menggunakan sarana Satelit ataupun kabel bawah laut sebagai contoh keseluruhan jaringan BANK BNI yang ada di Indonesia ataupun yang ada di Negara-negara lain. Menggunakan sarana WAN, Sebuah Bank yang ada di Bandung bisa menghubungi kantor cabangnya yang ada di Hongkong, hanya dalam beberapa menit. Biasanya WAN agak rumit dan sangat kompleks, menggunakan banyak sarana untuk menghubungkan antara LAN dan WAN ke dalam Komunikasi Global seperti Internet. Tapi bagaimanapun juga antara LAN, MAN dan WAN tidak banyak berbeda dalam beberapa hal, hanya lingkup areanya saja yang berbeda satu diantara yang lainnya. 

Topologi/Bentuk Fisik Jaringan :
Topologi suatu jaringan didasarkan pada cara penghubung sejumlah node atau sentral dalam membentuk suatu sistem jaringan. Topologi jaringan yang umum dipakai adalah : Mess, Bintang (Star), Bus, Tree, dan Cincin (Ring).

1.      Topologi Jaringan Mesh
Jaringan komputer 1

Topologi jaringan ini menerapkan hubungan antar sentral secara penuh. Jumlah saluran harus disediakan untuk membentuk jaringan Mesh adalah jumlah sentral dikurangi 1 (n-1, n = jumlah sentral). Tingkat kerumitan jaringan sebanding dengan meningkatnya jumlah sentral yang terpasang. Dengan demikian disamping kurang ekonomis juga relatif mahal dalam pengoperasiannya.

2.      Topologi Jaringan Bintang (Star)
Jaringan komputer2

Dalam topologi jaringan bintang, salah satu sentral dibuat sebagai sentral pusat. Bila dibandingkan dengan sistem mesh, sistem ini mempunyai tingkat kerumitan jaringan yang lebih sederhana sehingga sistem menjadi lebih ekonomis, tetapi beban yang dipikul sentral pusat cukup berat. Dengan demikian kemungkinan tingkat kerusakan atau gangguan dari sentral ini lebih besar.

3.      Topologi Jaringan Bus
Jaringan komputer3

Pada topologi ini semua sentral dihubungkan secara langsung pada medium transmisi dengan konfigurasi yang disebut Bus. Transmisi sinyal dari suatu sentral tidak dialirkan secara bersamaan dalam dua arah. Hal ini berbeda sekali dengan yang terjadi pada topologi jaringan mesh atau bintang, yang pada kedua sistem tersebut dapat dilakukan komunikasi atau interkoneksi antar sentral secara bersamaan. topologi jaringan bus tidak umum digunakan untuk interkoneksi antar sentral, tetapi biasanya digunakan pada sistem jaringan komputer.

4.      Topologi Jaringan Pohon (Tree)
Jaringan komputer4

Topologi jaringan ini disebut juga sebagai topologi jaringan bertingkat. Topologi ini biasanya digunakan untuk interkoneksi antar sentral dengan hirarki yang berbeda. Untuk hirarki yang lebih rendah digambarkan pada lokasi yang rendah dan semakin keatas mempunyai hirarki semakin tinggi. Topologi jaringan jenis ini cocok digunakan pada sistem jaringan komputer.

5.      Topologi Jaringan Cincin (Ring)
Jaringan komputer5

Untuk membentuk jaringan cincin, setiap sentral harus dihubungkan seri satu dengan yang lain dan hubungan ini akan membentuk loop tertutup. Dalam sistem ini setiap sentral harus dirancang agar dapat berinteraksi dengan sentral yang berdekatan maupun berjauhan. Dengan demikian kemampuan melakukan switching ke berbagai arah sentral. Keuntungan dari topologi jaringan ini antara lain : tingkat kerumitan jaringan rendah (sederhana), juga bila ada gangguan atau kerusakan pada suatu sentral maka aliran trafik dapat dilewatkan pada arah lain dalam sistem. Yang paling banyak digunakan dalam jaringan komputer adalah jaringanbertipe bus dan pohon (tree), hal ini karena alasan kerumitan, kemudahan instalasi dan pemeliharaan serta harga yang harus dibayar. Tapi hanya jaringan bertipe pohon (tree) saja yang diakui kehandalannya karena putusnya salah satu kabel pada client, tidak akan mempengaruhi hubungan client yang lain.

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Selasa, Mei 03, 2011

The Mother Lode of Intelligence

Osama bin Laden's Compound


The assault force of Navy SEALs snatched a trove of computer drives and disks during their weekend raid on Osama bin Laden’s compound, yielding what a U.S. official called “the mother lode of intelligence.”

The special operations forces grabbed personal computers, thumb drives and electronic equipment during the lightning raid that killed bin Laden, officials told POLITICO.

“They cleaned it out,” one official said. “Can you imagine what’s on Osama bin Laden’s hard drive?”

U.S. officials are about to find out. The material is being examined at a secret location in Afghanistan.

“Hundreds of people are going through it now,” an official said, adding that intelligence operatives back in Washington are very excited to find out what they have.

“It’s going to be great even if only 10 percent of it is actionable,” the official said.

Savoring the military and intelligence triumph, officials late Monday described new details about how the mission unfolded:

The SEALs took fire on their way to the compound’s third floor, where bin Laden had been sleeping, officials said. The encounter with bin Laden lasted only seconds, and ended with a kill shot to his face.

The team’s photos of bin Laden are gruesome, complicating officials’ deliberations about whether to release them.

Officials also have images of bin Laden in a white shroud before his burial at sea.

The raid was not supposed to last more than 30 minutes. The forces finished in 38 minutes, even though they lost one of their choppers and had to go to a back-up plan.

Four helicopters were used in the raid. Two went in, and two were in reserve.

Hovering above the compound on the way in, one of the choppers developed a mechanical problem that caused it to lose lift, officials said. The pilot made a controlled landing, according to the officials. When he couldn’t get the bird airborne again, the SEALs blew it up and left in one of the reserves.

Officials described the reaction of the special operators when they were told a number of weeks ago that they had been chosen to train for the mission.

“They were told, ‘We think we found Osama bin Laden, and your job is to kill him,’” an official recalled.

The SEALs started to cheer.

Radioing a commander on Sunday, the team reported the capture with a pre-arranged signal: “Geronimo!”
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Senin, Mei 02, 2011

Osama Bin Laden Dead


Bin Laden Dead  1


Osama Bin Laden is dead, President Obama announced Sunday night, in a televised address to the nation. His death was the result of a U.S. operation launched today in Abbottabad, Pakistan, against a compound where bin Laden was believed to be hiding, according to U.S. intelligence. After a firefight, a small team of American forces killed bin Laden and took possession of his body, the president said.

“Tonight I can report to the American people and the world that the United States has conducted an operation that killed Osama bin Laden,” Obama said during brief remarks at the White House.

(SCROLL DOWN FOR LIVE UPDATES)

“Justice has been done,” he said, in comments that marked a formal end of the manhunt for the most visible and emotionally-charged symbol of the terrorist attacks of Sept. 11, 2001.

The president said U.S. intelligence operatives received a tip in August on bin Laden’s whereabouts, which ultimately led to Sunday’s attack. Obama said he determined last week that the U.S. had enough reliable information to take action; by Sunday morning, he had authorized “a small team of Americans” to conduct an operation targeting bin Laden.

“After a fire fight, they killed Osama bin Laden and took custody of his body,” the president said. “No Americans were harmed. They took care to avoid civilian casualties.”

 Bin Laden Dead  2

Obama said the 9/11 attacks that bin Laden and his lieutenants orchestrated nearly 10 years ago remain “the worst attack on the American people in our history” and said the images of the crumbling Twin Towers “are seared into our national memory.”
Story continues below

The president emphasized that Americans “did not choose this fight” against al Qaeda, but rather, “it came to our shores.” He praised U.S. military and intelligence professionals for working “tirelessly to achieve this outcome.” To the families of 9/11 victims, he noted that the U.S. has “never forgotten your loss.”

“Tonight, let us think back to the sense of unity that prevailed on 9/11,” Obama said. “I know that it has, at times, frayed. Yet today’s achievement is a testament to the greatness of our country and the determination of the American people.”

Both Bill Clinton and George W. Bush had targeted bin Laden during their presidencies, and both had failed to either capture him or kill him. The failure to snare bin Laden weighed most heavily, perhaps, on the Bush Administration, which occupied the White House during the 9/11 attacks, and the al Qaeda leader’s killing falls exactly eight years to the day when Bush famously declared “Mission Accomplished” in Iraq.

Bush said in a statement that Obama called him Sunday night to inform him of “the momentous achievement” of bin Laden’s death.

“I congratulated him and the men and women of our military and intelligence communities who devoted their lives to this mission. They have our everlasting gratitude,” Bush said. “The fight against terror goes on, but tonight America has sent an unmistakable message: No matter how long it takes, justice will be done.”

Clinton, who was president when the first World Trade Center bombing occurred in 1993, issued a statement calling bin Laden’s death “a profoundly important moment not just for the families of those who lost their lives on 9/11 and in al-Qaida’s other attacks but for people all over the world who want to build a common future of peace, freedom, and cooperation for our children.”

In a conference call with reporters just after President Obama spoke, senior administration officials provided a detailed sketch of how the intelligence on bin Laden’s whereabouts was gathered.


Intelligence officials had been conducting lengthy reconnaissance work prior to receiving their key tip in August. According to senior administration officials, suspected terrorists in custody since 9/11 -- including the attack’s mastermind, Khalid Sheikh Mohammed -- identified a courier who had a close relationship with bin Laden.

“This man was one of the few al Qaeda couriers trusted by bin Laden,” one senior administration official said. “They indicated he might be living with and protecting bin Laden. But for years we were unable to identify his true name or his location. Four years ago we uncovered his identity… About two years ago, after months of persistent effort, we identified areas of Pakistan where the courier and his brother operated. Still, we were unable to pinpoint exactly where they lived due to extensive operational security on their part. The fact that they were being so careful reinforced our belief that we were on the right track.”

When the intelligence community finally pinpointed the courier’s location, they were “shocked by what we saw,” said this official.

The neighborhood in Abbottabad was “relatively affluent with lots of retired military,” this official continued, and was insulated from urban areas or places susceptible to natural disaster and terrorist attacks. The home was “roughly eight times larger than the other homes in the area,” and it was surrounded by 12-to-18-foot-high walls, topped with barbed wire. It had two security gates and a value of roughly $1 million, although it lacked telephone and Internet connections.


  Bin Laden Dead  3


An even more telling clue for intelligence operatives: The occupants of the house were burning their trash rather than putting it out for collection.

One senior administration official suggested bin Laden had been staying at the compound for at least six months without moving. Bin Laden was known to have regularly shifted locations to evade capture, so it’s unusual that he chose to stay in on spot for such an extended period.

More recently, the Obama administration had reduced the number of drone strikes in the area -- while ramping up surveillance -- in an effort to give the al Qaeda leader a heightened sense of safety in his home.

Prior to the operation, Obama convened nine meetings with his national security team to review intelligence. According to a White House aide, “Principals met formally an additional five times themselves and their deputies met seven times.”

The president made the decision to undertake the operation at 8:20 a.m. on April 29th in the White House’s Diplomatic Room before he left to survey tornado damage in Alabama. Tom Donilon, his National Security Advisor, prepared the formal orders and convened the principals at 3 p.m. that same day to complete the planning.

The next day, without giving off a hint of the weighty operation being planned, Obama prepared for and delivered his address at the annual White House Correspondent's Association dinner. The next morning he played nine holes of golf.

Final preparations were made on Sunday. At 2 p.m., the president met with top advisers for an hour and half, at which point he returned to the Situation Room for an additional briefing. Twenty minutes after that, he learned that bin Laden had been “tentatively identified.” By 7 p.m. he was told it was highly probable that bin Laden was at the compound. By 8:30 p.m., he received an additional briefing. He signed off on the attack after that.

No other intelligence operatives in other countries were told of the attack before it occurred -- including Pakistani operatives -- according to administration officials. Vice President Joseph Biden informed congressional leadership of the attack shortly before it took place, aides on the Hill told the Huffington Post.

Details about the fight itself are still difficult to come by. According to local reports in Pakistan, a helicopter involved in the attack had a mechanical problem and crashed.

U.S. forces intentionally destroyed the remainder of the wreckage to reduce signs of their presence in the area , according to NBC and other media reports. Two helicopters remained to provide cover for Joint Special Operations Command forces; in addition, there was a predator drone.

The fight lasted only 40 minutes and was described by a senior administration official as a “surgical raid” conducted by a Navy Seals unit. Bin Laden's adult son was killed, as were two of his couriers and a woman being used as a human shield. Bin Laden himself “did resist the assault force,” a senior administration official said. Reports on Sunday night said the terrorist leader was ultimately shot in the head.

Officials warned that in the aftermath of the attack, Americans should be on alert for a reprisal from al Qaeda. However, one official added, there were “no specific threats" as of Sunday night. ABC News reported that authorities plan to bury bin Laden’s body at sea in order to leave no definitive location for his final resting place. It will be done, an official added, “in accordance with Islamic practice and tradition." Hours later, CNN reported that the burial had taken place.

"Americans understand the costs of war," Obama said toward the end of his remarks. "Yet as a country, we will never tolerate our security being threatened, nor stand idly by when our people have been killed. We will be relentless in defense of our citizens and our friends and allies."
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