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Showing posts from November 1, 2009

Understanding Denial-of-Service Attacks

You may have heard of denial-of-service attacks launched against websites, but you can also be a victim of these attacks. Denial-of-service attacks can be difficult to distinguish from common network activity, but there are some indications that an attack is in progress.
What is a denial-of-service (DoS) attack?
In a denial-of-service (DoS) attack, an attacker attempts to prevent legitimate users from accessing information or services. By targeting your computer and its network connection, or the computers and network of the sites you are trying to use, an attacker may be able to prevent you from accessing email, websites, online accounts (banking, etc.), or other services that rely on the affected computer.
The most common and obvious type of DoS attack occurs when an attacker "floods" a network with information. When you type a URL for a particular website into your browser, you are sending a request to that site's computer server to view the page. Th…

DISA (Direct Inward System Access)

The DISA, Direct Inward System Access, application allows someone from outside the telephone switch (PBX) to obtain an "internal" system dialtone and to place calls from it as if they were placing a call from within the switch.

DISA plays a dialtone. The user enters their numeric passcode, followed by the pound sign (#). If the passcode is correct, the user is then given system dialtone on which a call may be placed.

My First Riverbed Certification - RCSP

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算一算時間,距離上次Riverbed通知我寄送證書的時間還不到一週,今天就收到了國際快遞,這一張是我的第一張Riverbed證書(希望不需再考第二張),不過我才只上了一門Riverbed課程而己呢,所以其實說實話對於Riverbed產品線的掌控程度還是很心虛地…希望能夠儘快去把其他的Riverbed課程上完,加強一下自己對Riverbed產品的了解及不同架構的各種可行解決方案。
不過說實話這份證書上沒有任何的序號或認證編號,其實很容易就可以偽造的說...