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If a router receives an IP packet that is too large for the network to which the packet is being forwarded, IP fragments the original packet into smaller packets that fit on the downstream network. When the packets arrive at their final destination, IP on the destination host reassembles the fragments into the original payload. This process is referred to as fragmentation and reassembly. Fragmentation can occur in environments that have a mix of networking technologies, such as Ethernet and Token Ring. The fragmentation and reassembly works as follows:

1. 2.

When an IP packet is sent, the sending host places a unique value in the Identification field. The IP packet is received at the router. If the router determines that the Maximum Transmission Unit (MTU) of the network onto which the packet is to be forwarded is smaller than the size of the IP packet, the router fragments the original IP payload into multiple packets, each of which is smaller than the receiving network s MTU size. Each fragment is sent with its own IP header that contains the following:

order to properly install; however, this is changing because the Windows logo requirements now specify that normal user applications must not require administrative rights in order to be installed successfully.

The original Identification field, which identifies all fragments that belong together. The More Fragments flag, which indicates that other fragments follow. The More Fragments flag is not set on the last fragment because no other fragments follow it. The Fragment Offset field, which indicates the position of the fragment relative to the original IP payload.

When the fragments are received by the destination host, they are identified by the Identification field as belonging together. The Fragment Offset field is then used to reassemble the fragments into the original IP payload.

Wait a minute...where is the WebBrowser control Don t worry, it didn t disappear. The The z-order is a control s position relative to the other windows or control s z-order has changed. The WebBrowser control is visually under the tool strip controls on the screen; think of container, and its parent is not the tool strip container but the Browser form. it as the third dimension or as being on top of or beneath other The Document Outline window is a valuable tool that can help you solve this problem controls. and save you a lot of time. For those of you familiar with previous versions of Visual Studio, this window existed before but only for HTML and ASPX documents. With Visual Studio 2008, it has been extended to Windows Forms applications. To have the Document Outline window in your IDE, simply click View, Other Windows, Document Outline, or press Ctrl+Alt+T. This view lets you manage all the controls on your form. It shows how the controls are arranged on the screen and which controls belong to another control. For instance, right now you cannot see the WebBrowser control, but if you open the Document Outline window, you ll see that the WebBrowser control is at the same level as the newly added tool strip container (see Figure 6-12). To rearrange the order and change how the controls are displayed, follow the next Figure 6-12 The Document Outline window for the My Own Browser project two steps.

13, Selecting a File System, discusses the differences between FAT32 and NTFS, and discusses the strengths and weaknesses of each. To maximize system security, however, it is best to only use NTFS on any partition that will be made accessible via the network. In fact, due to its ability to audit file access (useful when performing forensic analysis of a security violation) and its ability to protect files from unauthorized local access, NTFS should be used on all system and boot partitions as well to prevent damage to the operating system or important personal data.

Address Resolution Protocol performs IP address to MAC address resolution for outgoing packets. As each outgoing addressed IP datagram is encapsulated in a frame, source and destination MAC addresses must be added. Determining the destination MAC address for each frame is the responsibility of ARP. ARP is defined in RFC 826.

Part III: