O because addresses are allocated based on physical

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o Because addresses are allocated based on physical location, the prefix generally identifies the location of the host. The 64-bit prefix is often referred to as the global routing prefix.
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Interface ID The last 64 bits are the interface ID . This is the unique address assigned to an interface. o Addresses are assigned to interfaces (network connections), not to the host. Technically, the interface ID is not a host address. o In most cases, individual interface IDs are not assigned by ISPs, but are rather generated automatically or managed by site administrators. o Interface IDs must be unique within a subnet, but can be the same if the interface is on different subnets. o On Ethernet networks, the interface ID can be automatically derived from the MAC address. Using the automatic host ID simplifies administration. Wireless Networking 0:00-0:35 In addition to copper wires, or fiber optic cables, networks can also use radio waves as the communication medium. These types of networks are called wireless, or Wi-Fi networks. Wireless networking has become commonplace in both the home and at work. Practically every network uses some sort of wireless component. Because of this, it's important that you know the structure of a Wi-Fi network, and the characteristics of various wireless technologies. Wireless networks can typically operate in one of two modes. The first mode is called ad hoc mode. Wireless Ad Hoc Network 0:36-1:07 With ad hoc mode, there's no central connection point. Instead, hosts connect directly to each other using a wireless network interface card. And each host is responsible for keeping track of communications with other devices. In addition, each host can be used to forward data for other hosts. For example, this host here could use these two hosts as a communication channel in order to communicate with this device here. A wireless ad hoc network is considered a decentralized wireless network, because it doesn't rely on any existing wireless infrastructure and can be created anywhere on the fly. Infrastructure Implementation 1:08-1:27 The second mode is called infrastructure mode. With infrastructure mode, each wireless hostconnects to a central connecting device called a wireless access point, or simply AP. In this configuration, hosts communicate with each other through the AP, instead of directly with each other. The AP behaves much in the same way as a wired switch in this mode. Wireless Access Point 1:28-2:04 The wireless AP, itself, plays a very important role in a network. Not only does it control communication between devices, but it is also able to bridge the wireless network with a wired network. For example, this access point can be connected directly to the Internet, allowing onlinecommunications for wireless devices. The AP can also be connected to an Ethernet switch, providing access to the entire network. It's also possible to connect multiple access points together in order to extend the range of a wireless network.
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