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Additional resources for Wireless Security: Know It All
As well as identifying a computer or other networked device, the IP address also uniquely identiﬁes the network that the device is connected to. These two parts of the IP address are known as the host ID and the network ID. The network ID is important because it allows a device transmitting a data packet to know what the ﬁrst port of call needs to be in the route to the packet’s destination. If a device determines that the network ID of the packet’s destination is the same as its own network ID, then the packet does not need to be externally routed, for example through the network’s gateway and out onto the Internet.
Com 44 Chapter 2 while asynchronous transfers are delay-tolerant and are able to wait for available bandwidth. USB control protocols are designed speciﬁcally to give a low protocol overhead, resulting in highly effective utilization of the available bandwidth. This available bandwidth is shared among all connected devices and is allocated using “pipes,” with each pipe representing a connection between the host and a single device. The bandwidth for a pipe is allocated when the pipe is established, and a wide range of different device bit rates and device types can be supported concurrently.
The MAC address of a network adapter on a Windows PC can be found in Windows 95, 98 or Me by clicking Start→Run, and then typing “winipcfg”, and selecting the adapter, or in Windows NT, 2000, and XP by opening a DOS Window (click Start→Programs→Accessories→Command Prompt) and typing “ipconﬁg/all”. When an application such as a web browser sends a request for data onto the network, the Application layer request comes down to the MAC SAP as an MSDU. The MSDU is extended with a MAC header that includes the MAC address of the source device’s network adapter.