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Windows 7 machines that were not patched got infected.

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Microsoft issued a patch in March to fix the exploit used by WannaCry Ransomware.

There were a number of “zero day” exploits revealed in the WikiLeaks data dumps.

Hence, it’s called a “zero day” exploit, vulnerability, or attack. If malware exploiting a specific vulnerability is discovered “in the wild” before a fix for that vulnerability is available, then Microsoft has zero days to fix the problem.

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If a malware author discovers the problem and releases malware that exploits it, then systems can become infected before anti-virus software providers can update their databases and release the update to their users.When a “good guy” will discover a vulnerability, they contact Microsoft so a fix can be made available before the vulnerability becomes general knowledge.Hackers can’t exploit things they don’t know about. If no one knows about them, then it’s not an immediate threat. There are security vulnerabilities in Windows (and all operating systems) that have not yet been discovered.It’s not until your anti-virus software provider updates their virus databases and you take that update that your scanner knows what to look for. Tech Talk Responds: The very nature of “zero day” exploits is that your virus scanner would show that you were clean both before and after being infected.Scanning both before and after this attack showed no prior or present malware infection. I saw the hacked behavior and immediately turned off my computer. Can you tell me more about zero-day drive-by attacks? I experienced one on my fully updated and patched Windows computer which has the latest anti-malware tools. I have heard a lot about zero-day exploits after the NSA and CIA hacking tools were released on Wikileaks. Email from Lacy in San Francisco: Dear Doc and Jim.Wii-Fi is essential if you’ve got mobile devices. On the other hand, Wi-Fi is speedy, super convenient, and perfectly serviceable for most of what we do on our networks.They can’t see you Ethernet signals, if you turn off your Wi-Fi signal completely. Wi-Fi is broadcast to you neighbors and they can hack your system with the proper tools.The layout of your home, objects blocking the signal, interference from electrical devices or your neighbors Wi-Fi networks-all these things contribute to Wi-Fi being generally less reliable. Wi-Fi is subject to a lot more interference than a wired connection. Ethernet offers a more reliable connection than Wi-Fi.If you’re playing online games and need reaction time to be as quick as possible, you’re probably better off with a wired Ethernet connection. If reducing latency as much as possible is your concern.If you have multiple devices that back up to a NAS, backup server, or shared hard drive, backups will go faster over an Ethernet connection. However, your real limit with be the speed of your Internet connection. On the other hand, a wired Ethernet connection can theoretically offer up to 10 Gb/s, if you have a Cat6 cable. The new standards like 802.11ac and 802.11n, which offer maximum speeds of 866.7 Mb/s and 150 Mb/s, respectively.

The three main advantages of using Ethernet over Wi-Fi are faster speeds, lower latency, reliable connections, security. Tech Talk Responds: Wi-Fi is more convenient than wired Ethernet cables, but Ethernet still offers significant advantages.Is it better to connect to the Internet with Ethernet or just use Wi-Fi? My computer is right beside the router, so I actually have a choice. My Wi-Fi router has Ethernet connections on the back. Email from Tracy in Fairfax: Dear Tech Talk.HDMI 2.0a, released in 2015: Supports for High-Dynamic Range (HDR) Video.HDMI 2.0, released in 2013: Supports 4K video at 60 frames per second.HDMI 1.4, released in 2009: Supports 4K video, HDMI Ethernet, Audio Return Channel (ARC), and 3D over HDMI.Your receiver and other gear will also need to support 4K Because HDMI is a purely digital signal either the cable works or it doesn’t. There is a very good chance that your old HDMI cables will work fine with your new 4K TV, unless you purchased them before 2009.

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Standard Speed cables have the bandwidth to handle up to 1080i and High Speed cables have the bandwidth to handle 1080p and 4K.

Tech Talk Responds: There are only four cable designations that are legitimate and recognized by the HDMI organization: High Speed and Standard Speed.

Do I really have to buy a new set of cables or will my old cable work? Love the podcast. The salesman tried to sell a new set of cable that support HDMI 2.0.

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I recently bought a new TV with HDMI inputs.

Email from Mai in Ohio: Dear Doc and Jim.