Right Equipment

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WASHINGTON， Oct. 21 (Xinhua) -- Twitter， PayPal and some other major United States websites were shut down temporarily on Friday as American Internet infrastructure companies Dyn and Amazon were hit by waves of cyber attacks.

Dyn， headquartered in New Hampshire， said in posts on its website that its Domain Name System (DNS) infrastructure suffered three waves of distributed denial of service (DDoS) attacks， which flooded it with traffic from multiple sources to make it inaccessible.

The company said the first wave was a "large" DDoS attack that started at 7:10 a.m. EDT (1110 GMT) and mainly affected the U.S. east coast.

"Dyn's engineers were able to successfully mitigate the attack at approximately 13:20 UTC (1320 GMT)， and shortly after， the attack subsided，" it said.

Compared with the first wave， the second one that started at about 11:50 a.m. EDT (1550 GMT) and lasted until 1:00 p.m. EDT (1700 GMT) was "distributed in a more global fashion，" with affected customers possibly seeing "intermittent resolution issues as well as increased global latency，" according to the company.

At around 4:00 p.m. EDT (2000 GMT)， Dyn reported a third DDoS attack， which it said had been "resolved" a little over two hours later.

Amazon Web Services (AWS)， a unit of Amazon that hosts many of the web's popular destinations including Netflix， also reported an attack that affected people on the U.S. east coast around the same time in the morning.

"Between 4:31 a.m. (1131 GMT) and 6:10 a.m. PDT (1310 GMT)， we experienced errors resolving the DNS hostnames used to access some AWS services in the US-EAST-1 Region，" the company said on its website.

But this issue has been resolved and the service is now operating normally， it noted.

The attacks reportedly kept many users in the United States and parts of Europe from accessing Twitter， PayPal， Reddit， Spotify， Netflix and other sites.

Digital payments company PayPal was one of the companies that admitted experiencing brief service interruptions due to the attacks.

"We're sorry for the inconvenience，" PayPal tweeted.

White House spokesman Josh Earnest said the U.S. Department of Homeland Security is monitoring this situation and will take a close look at it.

"But at this point， I don't have any information to share about who may be responsible for that malicious activity，" Earnest told reporters.

A senior U.S. intelligence official told NBC News their current assessment is that this is "a classic case of internet vandalism."

The official was quoted as saying that it does not appear at this point to be any kind of state-sponsored or directed attacks.

A group called New World Hackers claimed responsibility for the attacks via Twitter， although their claims cannot be independently verified.

In its Twitter account， the group retweeted a tweet from a person who spoke with it， saying the attacks were "a test of attack power" and that "their main enemy is Russia."

Scuba diving can be a great pastime for you if you love the water. In the summer it's a great water sport where you can cool off while keeping physically fit! However there are aspects that you will want to consider first. These will indeed help you better decide if it's for you Leonard Williams Jets Jersey , and make it very enjoyable as well.

Diver Requirements

Before beginning any new physical activity, you should always be sure you can handle what it requires. If you have any conditions that preclude you from other activities such as heart conditions, diabetes, high blood pressure, breathing problems and definitely anything that would make you more susceptible to drowning, you will need to consult a physician to be sure you are able to dive! This is recommended for anyone else as well.

You are also required to complete a form to guarantee you are fit to dive. To find out what is required on the form in preparation, you can find it online at Divers Alert Network. Like any sport, you need to be in a condition to endure times of physical exertion. These include carrying a heavy oxygen tank above water, as well as times when you might need to swim faster. The diving gear adds extra strength demand to some degree as well.

You will need to be at least 15 years old for adult Scuba diving, or at least 10 for junior diving instructions and limited privilege. Certification will involve a Scuba Diving Test which will prove you know what is needed to dive safely.

The Right Equipment

As with nearly any sport, there is some gear required. Though when it comes to scuba diving, having the right equipment, and knowing well how to use it can turn out to be a matter of life and death under extreme circumstances.

Of course the most important scuba diving equipment is your breathing apparatus. It can be heavy, and there are important aspects of it that you need to be sure of each time you use different equipment.

Beyond these, you also need a wetsuit, fins, and other items that will help protect you from the underwater environment where you might need to keep warmer, as well as protected from sharp objects and certain water life.

For the sake of good experienced maintenance, as well as the price, many opt to rent their gear. Often this will be from a sport shop where you scuba dive. You can also buy your own gear, though that will leave much of the burden of keeping it fit on you, as it is yours.

Why Many Scuba Dive

While the majority of scuba diving is recreation, there are those that do it for a living as well. Scientific exploration and research is another area with a lot of scuba diving demand. They spend a lot of time in the water watching sea life cycles, and how microorganismscoral fit the whole underwater environment. There are also others that work in constructing underwater platf. JuJu Smith-Schuster Jersey Authentic Jimmy Garoppolo Jersey Authentic Jason Witten Jersey Jared Cook Youth Jersey Jalen Ramsey Kids Jersey Ezekiel Elliott Kids Jersey Drew Brees Saints Jersey David Johnson Cardinals Jersey Dallas Goedert Eagles Jersey Bradley Chubb Broncos Jersey