wiki

dark web

The dark web is a portion of the deep web that’s inaccessible without specialized privacy software. The most infamous software used to access the dark web is Tor, but other software such as I2P or Freenet exists as well.

The reason why software is required to access the dark web is because servers running on the dark web conceal themselves using what are called hidden services. By using hidden services, servers can prevent themselves from being located; however, specialized software that work with hidden services such as Tor is needed to access them.

Websites on the dark web can be accessed in the same manner to those on the clear web, which is what you’re using right now to access this website. However, rather than typing in an address followed by a .com, .net, .org, .us, etc. dark web websites use .onion. Additionally, most of the websites on the dark web aren’t indexed by search engines either, so you’ll have to know the address of the site you want to visit.

As the dark web isn’t policed, anything can exist on the dark web. While the dark web has gotten a lot of negative publicity due to users on the service buying/selling drugs, guns, fake passports and even assassinations, the dark web is also commonly used by whistleblowers, journalists, and regular internet users who simply want to use the anonymity benefits of the Onion Network to surf the clear web.

DDR4

DDR4 SDRAM, or just simply DDR4, stands for Double Data Rate 4th Generation Synchronous Dynamic Random Access Memory. DDR4 is the latest generation of DDR SDRAM and is the successor to the widely adopted DDR3 SDRAM.

DDR4 has numerous advantages over its predecessors including a lower operating voltage, faster speeds, higher capacity, and significantly improved error correction capabilities.

deep web

The deep web is a portion of the internet that isn’t indexed by search engines. This can include anything like access to your e-mail account, access to your bank account, access to your school’s academic journals, access to your workplace’s internal intranet, or simply just a website that’s accessible by its IP only.

One thing that’s important to note is that the deep web should not be confused with the dark web. While technically the dark web is a part of the deep web, the deep web isn’t as secretive nor does it have the same negative connotation that the dark web implies.

DFS

DFS, when used in the context of wireless networking, stands for Dynamic Frequency Selection.

DFS is a spectrum sharing technology which allows Wi-Fi to operate in 5GHz frequency bands allocated to radar systems without causing interference. In order to do this, devices that support DFS will continually monitor the frequency for potential radar signals. If a radar signal is detected, the device will leave the frequency, switch to another channel, and stay away from the channel with a radar signal for a set period of time.

DFS channels include 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136 and 140.

Devices that support DFS include the Ubiquiti UniFi AP AC PRO.

DHCP

DHCP, or Dynamic Host Configuration Protocol, is a technology designed to allow clients to request a lease of an IP address from a pool (also know as a table) of available IPs at the time of the request. DHCP can also supply other information such as the subnet mask and default gateway.

The primary use of DHCP is to simplify the work of the network admin. It offloads the work of having to manually assign IPs and prevents IP conflicts among clients. It is an essential feature in both small home networks where consumers are unfamiliar with complicated network setup and large networks that have hundreds and thousands of clients.