Better than Best Effort Service in Java

Making Denso QR Bar Code in Java Better than Best Effort Service
Better than Best Effort Service
QR Code ISO/IEC18004 Generation In Java
Using Barcode drawer for Java Control to generate, create Denso QR Bar Code image in Java applications.
Scenario 2: A 1 Mbps Audio Application and a High Priority FTP Transfer
Paint Barcode In Java
Using Barcode creator for Java Control to generate, create barcode image in Java applications.
Our second scenario is only slightly different from scenario 1 Suppose now that the FTP user has purchased "platinum service" (ie, high priced) Internet access from its ISP, while the audio user has purchased cheap, low-budget Internet service that costs only a minuscule fraction of platinum service Should the cheap user's audio packets be given priority over FTP packets in this case Arguably not In this case, it would seem more reasonable to distinguish packets on the basis of the sender's IP address More generally, we see that it is necessary for a router to classify packets according to some criteria This then calls for a slight modification to principle 1: Principle 1: Packet classification allows a router to distinguish among packets belonging to different classes of traffic Explicit packet marking is one way in which packets may be distinguished However, the marking carried by a packet does not, by itself, mandate that the packet will receive a given quality of service Marking is but one mechanism for distinguishing packets The manner in which a router distinguishes among packets by treating them differently is a policy decision
Decoding Bar Code In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Scenario 3: A Misbehaving Audio Application and an FTP Transfer
Creating QR Code 2d Barcode In Visual C#
Using Barcode encoder for .NET framework Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications.
Suppose now that somehow (by use of mechanisms that we will study in subsequent sections), the router knows it should give priority to packets from the 1 Mbps audio application Since the outgoing link speed is 15 Mbps, even though the FTP packets receive lower priority, they will still, on average, receive 05 Mbps of transmission service But what happens if the audio application starts sending packets at a rate of 15 Mbps or higher (either maliciously or due to an error in the application) In this case, the FTP packets will starve, ie, will not receive any service on the R1-to-R2 link Similar problems would occur if multiple applications (eg, multiple audio calls), all with the same priority, were sharing a link's bandwidth; one non-compliant flow could degrade and ruin the performance of the other flows Ideally, one wants a degree of isolation among flows, in order to protect one flow from another misbehaving flow This then is a second underlying principle the provision of QoS guarantees
Painting QR Code ISO/IEC18004 In .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
Principle 2: It is desirable to provide a degree of isolation among traffic flows, so that one flow is not adversely affected by another misbehaving flow In the following section, we will examine several specific mechanisms for providing this isolation among flows We note here that two broad approaches can be taken First, it is possible to "police" traffic flows, as shown in Figure 65-3 If a traffic flow must meet certain criteria (eg, that the audio flow not exceed a peak rate of 1 Mbps), then a policing mechanism can be put into place to ensure that this criteria is indeed observed If the policed application misbehaves, the policing mechanism will take some action (eg, drop or delay packets that are in violation of the criteria) so that the traffic actually entering the network conforms to the criteria The leaky bucket mechanism that we examine in the following section is perhaps the most widely used policing mechanism In Figure 65-3, the packet classification and marking mechanism (principle 1) and the policing mechanism (principle 2) are co-located at the "edge" of the network, either in the end system, or at an
Making QR Code 2d Barcode In Visual Studio .NET
Using Barcode encoder for Visual Studio .NET Control to generate, create QR-Code image in .NET applications.
file:///D|/Downloads/Livros/computa o/Computer%20Networoach%20Featuring%20the%20Internet/better_than_besthtm (3 of 7)20/11/2004 15:52:52
Making QR Code 2d Barcode In VB.NET
Using Barcode generation for .NET framework Control to generate, create QR image in .NET framework applications.
Better than Best Effort Service
Draw Code 39 Extended In Java
Using Barcode drawer for Java Control to generate, create USS Code 39 image in Java applications.
edge router
Print Code 128B In Java
Using Barcode drawer for Java Control to generate, create Code 128 Code Set A image in Java applications.
Figure 65-3: Policing (and marking) the audio and ftp traffic flows An alternate approach for providing isolation among traffic flows is for the link-level packet scheduling mechanism to explicitly allocate a fixed amount of link bandwidth to each application flow For example, the audio flow could be allocated 1Mbps at R1, and the ftp flow could be allocated 05 Mbps In this case, the audio and FTP flows see a logical link with capacity 10 and 05 Mbps, respectively, as shown in Figure 65-4
Making EAN / UCC - 13 In Java
Using Barcode drawer for Java Control to generate, create EAN 13 image in Java applications.
file:///D|/Downloads/Livros/computa o/Computer%20Networoach%20Featuring%20the%20Internet/better_than_besthtm (4 of 7)20/11/2004 15:52:52
Barcode Generation In Java
Using Barcode drawer for Java Control to generate, create barcode image in Java applications.
Encoding Bar Code In Java
Using Barcode drawer for Java Control to generate, create barcode image in Java applications.
Recognizing EAN-13 Supplement 5 In VS .NET
Using Barcode reader for .NET Control to read, scan read, scan image in .NET applications.
Encode UPC Symbol In VS .NET
Using Barcode maker for Visual Studio .NET Control to generate, create UPC-A image in .NET framework applications.
Print Bar Code In VS .NET
Using Barcode generation for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Read Data Matrix In VS .NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.