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IPv6 application considers IPv4 as a data link layer within the network stack Tunneling examples that you may be familiar with include Layer 2 Tunneling Protocol (L2TP) for virtual private network (VPN) tunnels and IPSec The tunneling technologies used to bridge IPv6 to IPv4 are transition mechanisms They are how a network with IPv6 hosts communicates with backwards compatibility while other networks upgrade to IPv6 They are not meant to be permanent, but you can figure on them being around for a long time nonetheless Automatic Tunneling Tunnel endpoints are determined by IPv6 routers Three automatic tunneling options include 6to4, Teredo and ISATAP: 6to4 tunneling The recommended technique for automatic tunneling is 6to4 tunneling Tunnel endpoints are determined by using a well-known IPv4 anycast addresses on the remote side and embedding IPv4 address information within IPv6 addresses on the local side This type of tunneling is widely available in modern routing infrastructures Teredo This type of tunneling uses UDP encapsulation, which most NAT devices can forward IPv6 hosts behind NAT services can be used as Teredo tunnel endpoints even when they don't have a dedicated public IPv4 address Using Teredo, IPv6 hosts on separate IPv4 networks can communicate without any alteration to the routing infrastructure Though not yet widely available, Teredo is enabled by default in Vista, but is inactive NOTE Teredo was first released with the Advanced Networking Pack for Windows XP with Service Pack 1, and is also included with Windows XP Service Pack 2 and Windows Server 2003 Service Pack 1 Teredo IPv6 addresses are global in scope and unique within the Internet To activate it, simply use an application that requires it, or configure a rule in Windows Firewall to allow edge traversal Vista s implementation of Teredo includes the following characteristics: It is enabled for domain member computers, where Teredo for Windows XP and Windows Server 2003 automatically disabled itself if the computer was a member of a domain It can now work if there is one Teredo client behind one or more symmetric NATs A symmetric NAT maps the same private address to different public addresses, depending on the external destination address Teredo for Windows XP and Windows Server 2003 disables itself if it detects that it is behind a symmetric NAT This new behavior allows Teredo to work between a larger set of Internet-connected hosts.

could end up saving bad data Since AddNewCustomer doesn t have an implementation, this is all speculation, but this outlines a few of the many problems that can occur if you allow your business objects to accept data that is bad for your program The macro demonstrated in this section will show how to check a string parameter for null, empty, or white space and throw an ArgumentNullException This will prevent callers from passing bad data and give them a meaningful message To create a macro, you will need to locate the position in the code where the macro starts (if applicable), start recording, perform VS actions, and stop recording It s somewhat like using a video recorder where you have to find a TV show, start the recording, allow the show to play, and then stop recording Perform the following steps to create the parameter validation macro:

File format The way information is encoded in a file Two primary types are binary (pictures) and ASCII (text), but within those there are many formats, such as BMP and GIF for pictures Commonly represented by a suffix at the end of the filename for example, txt for a text file or exe for an executable File fragmentation The allocation of a file in a non-contiguous sector on a disk Fragmentation occurs because of multiple deletions and write operations File server A computer designated to store software, courseware, administrative tools, and other data on a local- or wide-area network It serves this information to other computers via the network when users enter their personal access codes File system A scheme that directs how an OS stores and retrieves data on and off a drive; FAT32 and NTFS are both file systems Filename A name assigned to a file when the file is first written on a disk Every file on a disk within the same folder must have a unique name Filenames can contain any character (including spaces), except the following: \ / : * < > | Firewall A device that restricts traffic between a local network and the Internet FireWire (IEEE 1394) An IEEE 1394 interconnection standard to send wide-band signals over a serialized, physically thin connector system This serial bus developed by Apple and Texas Instruments enables connection of 60 devices at speeds up to 800 megabits per second Firmware Embedded programs or code that is stored on a ROM chip Firmware is generally OS-independent, thus allowing devices to operate in a wide variety of circumstances without direct OS support The system BIOS is firmware Flash ROM A type of ROM technology that can be electrically reprogrammed while still in the PC Flash is the overwhelmingly most common storage medium of BIOS in PCs today, as it can be upgraded without even having to open the computer on most systems.

Intrasite Automatic Tunnel Addressing Protocol (ISATAP) ISATAP is defined in RFC 4214 Cisco and Microsoft are developing an implementation

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of it at the time of this writing With ISATAP, IPv4 network hosts emulate a logical IPv6 subnet scheme This enables ISATAP nodes located on the IPv4 network to tunnel to each other with logical IPv6 connectivity through an ISATAP router IPv4 infrastructures can provide unicast IPv6 connectivity with the addition of an ISATAP router Configured Tunneling Configured tunneling is a technique whereby the tunnel endpoints are configured explicitly, either by a human operator or by an automatic service known as a tunnel broker A tunnel broker provides IPv6 tunnels to end users/end sites using manual, scripted, or automatic configuration Tunnel brokers offer protocol 41, or proto-41, tunnels, which encapsulate IPv6 inside IPv4 packets and update the IPv4 header The header s protocol field is set to 41, which is IPv6 NOTE Configured tunneling is usually more deterministic and easier to debug than automatic tunneling, and is, therefore, recommended for large, well-administered networks Configured tunneling typically uses a protocol 41 tunnel (recommended) or raw UDP encapsulation