create barcode with c# Understanding Connection Types in C#.NET

Creating Quick Response Code in C#.NET Understanding Connection Types

Understanding Connection Types
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Recognizing QR Code ISO/IEC18004 In C#
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To place the connectivity needs of the remote office in perspective, Table 25-1 includes both commonly used connection types as well as some of those less often used in the remote office environment.
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Table 25-1 Connection Type Remote access
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Connection Types
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Communication Method
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Example Connection to an organization s network or the Internet by using dial-up access.
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Dial-up modem ISDN X.25 Point-to-Point Protocol over Ethernet (PPPoE) Microsoft Ethernet PVC Point-to-Point Tunneling Protocol (PPTP) Layer Two Tunneling Protocol (L2TP)
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Secure connection to a corporate network over an existing connection to the Internet.
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Part IV:
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Networking
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Table 25-1 Connection Type Local
Connection Types
Communication Method
Example Connection within a corporate network. (Ethernet is most suitable for Small Office/Home Office LAN.)
Ethernet Token Ring FDDI LAN Emulation HPNA 802.11x IP over ATM IrDA T-Carrier leased lines Cable modem DSL Dial-up Frame Relay USB Serial cabling Direct parallel cabling Infrared link IEEE 1394 (FireWire) Dial-up VPN Direct connections
Persistent connections between geographically dispersed areas.
Direct cable
Direct data transfer between two devices (for example, information synchronization between a handheld Microsoft Windows CE based computer and a desktop computer). Connections from other computers to dial in to this computer.
Incoming
Remote Access Connection Types
Remote access allows remote clients running Windows to access a network. You can use the following remote access connection types.
Dial-Up Modem
Dial-up modem is the most commonly used form of remote access connection. Also called a slow link, an analog dial-up connection makes use of the PSTN rather than a dedicated circuit or some other type of private network.
ISDN
Integrated Services Digital Network (ISDN) technology makes it possible to offer telephone customers digital data and voice services using a single wire by dividing the capacity of the wire into separate channels. A basic rate ISDN line can offer speeds of up to 128 kilobits per second
25:
Connecting Remote Offices
(Kbps) using two 64 Kbps channels. An ISDN line must be installed by the phone company at both the server site and the remote site. In most instances, ISDN is used for intermittent, dialup connectivity rather than for a persistent or permanent connection.
X.25
X.25 is a standard that defines the connection between a terminal and a packet-switching data network. When X.25 originated in the early 1970s, the noisy, copper-based telephone infrastructure dictated devoting a great deal of overhead to ensure packet reliability. Media reliability improvements since then, including optical fiber lines, has made the costly focus on datalink reliability unnecessary. ISDN and Frame Relay have largely replaced X.25 as preferred remote connectivity solutions. X.25, however, remains a widely accepted worldwide data communications standard. Consequently, X.25 continues to be used, often in tandem with newer technologies. X.25 is supported in Windows XP Professional.
PPPoE
Point-to-Point Protocol (PPP) is a set of framing and authentication protocols included with Windows remote access to ensure interoperability with third-party remote access software. PPP over Ethernet (PPPoE) provides the ability to connect a network of hosts over a simple bridging access device to a remote access concentrator. With this model, each host uses its own PPP connection and the user is presented with a familiar user interface. Access control, billing, and type of service can be accomplished on a per-user, rather than a per-site, basis. To provide a point-to-point connection over Ethernet, each PPP session must learn the Ethernet address of the remote peer, as well as establish a unique session identifier. PPPoE includes a discovery protocol that allows this to take place.
Microsoft Ethernet PVC
Microsoft Ethernet PVC provides support for Ethernet and IP data encapsulation over ATM. This enables the encapsulation and transport of IP or Ethernet packets over ATM between a client connected by means of an ATM permanent virtual connection to a supporting infrastructure. To accomplish this, Microsoft Ethernet PVC acts as a bridging Ethernet adapter for the TCP/IP protocol or a routing adapter for the TCP/IP protocol alone and uses the PVC on the ATM or internal ADSL adapter to transfer encapsulated data. Windows XP Professional supports the two encapsulation methods defined in RFC 2684: LLC Encapsulation and VC Multiplexing. Both Ethernet and IP protocols are supported using either encapsulation method on both bridged and routed PDUs (protocol data units). For example, protocols supported by Microsoft Ethernet PVC in Windows XP Professional include PPPoE (PPP over Ethernet), L2TP (Layer Two Tunneling Protocol), Ethernet, or Ethernet encapsulated in IP.
Part IV:
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