how to create 2d barcode in excel SECTION 202 in Software

Painting Code-39 in Software SECTION 202

SECTION 202
Code 3/9 Printer In None
Using Barcode creation for Software Control to generate, create Code39 image in Software applications.
Code39 Scanner In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
IPv4
Generating USS Code 39 In Visual C#.NET
Using Barcode printer for .NET Control to generate, create Code 39 Extended image in .NET framework applications.
Code 39 Full ASCII Encoder In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create Code 3/9 image in ASP.NET applications.
datagram is not the only thing encapsulated in a frame; it may be that padding has been added For example, the Ethernet protocol has a minimum and maximum restriction on the size of data that can be encapsulated in a frame (46 to 1500 bytes) If the size of an IPv4 datagram is less than 46 bytes, some padding will be added to meet this requirement In this case, when a machine decapsulates the datagram, it needs to check the total length field to determine how much is really data and how much is padding (see Figure 207)
Paint ANSI/AIM Code 39 In .NET
Using Barcode creation for Visual Studio .NET Control to generate, create Code39 image in .NET applications.
Code 3/9 Generator In VB.NET
Using Barcode maker for VS .NET Control to generate, create ANSI/AIM Code 39 image in Visual Studio .NET applications.
Figure 207 Encapsulation ofa small datagram in an Ethernet frame
Painting Bar Code In None
Using Barcode creator for Software Control to generate, create barcode image in Software applications.
Make EAN / UCC - 13 In None
Using Barcode creator for Software Control to generate, create UCC-128 image in Software applications.
Length: Minimum 46 bytes
Bar Code Generation In None
Using Barcode encoder for Software Control to generate, create barcode image in Software applications.
Generate EAN 13 In None
Using Barcode maker for Software Control to generate, create EAN 13 image in Software applications.
L2 Header
UPCA Printer In None
Using Barcode maker for Software Control to generate, create GS1 - 12 image in Software applications.
Make Data Matrix In None
Using Barcode printer for Software Control to generate, create Data Matrix ECC200 image in Software applications.
Data < 46 bytes
Make Leitcode In None
Using Barcode maker for Software Control to generate, create Leitcode image in Software applications.
Create European Article Number 13 In .NET
Using Barcode encoder for Reporting Service Control to generate, create EAN 13 image in Reporting Service applications.
Padding
Generate Bar Code In VS .NET
Using Barcode printer for Reporting Service Control to generate, create barcode image in Reporting Service applications.
EAN-13 Supplement 5 Scanner In .NET Framework
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET framework applications.
L2 Trailer
ANSI/AIM Code 128 Maker In Java
Using Barcode creator for Java Control to generate, create Code 128 Code Set B image in Java applications.
UPC-A Generator In .NET Framework
Using Barcode maker for Reporting Service Control to generate, create UPC-A Supplement 2 image in Reporting Service applications.
o o o
GTIN - 13 Recognizer In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Barcode Drawer In None
Using Barcode drawer for Excel Control to generate, create barcode image in Microsoft Excel applications.
Identification This field is used in fragmentation (discussed in the next section) Flags This field is used in fragmentation (discussed in the next section) Fragmentation offset This field is used in fragmentation (discussed in the next section) Time to live A datagram has a limited lifetime in its travel through an internet This field was originally designed to hold a timestamp, which was decremented by each visited router The datagram was discarded when the value became zero However, for this scheme, all the machines must have synchronized clocks and must know how long it takes for a datagram to go from one machine to another Today, this field is used mostly to control the maximum number of hops (routers) visited by the datagram When a source host sends the datagram, it stores a number in this field This value is approximately 2 times the maximum number of routes between any two hosts Each router that processes the datagram decrements this number by 1 If this value, after being decremented, is zero, the router discards the datagram This field is needed because routing tables in the Internet can become corrupted A datagram may travel between two or more routers for a long time without ever getting delivered to the destination host This field limits the lifetime of a datagram Another use of this field is to intentionally limit the journey of the packet For example, if the source wants to confine the packet to the local network, it can store 1 in this field When the packet arrives at the first router, this value is decremented to 0, and the datagram is discarded Protocol This 8-bit field defines the higher-level protocol that uses the services of the IPv4 layer An IPv4 datagram can encapsulate data from several higher-level protocols such as TCP, UDP, ICMP, and IGMP This field specifies the final destination protocol to which the IPv4 datagram is delivered In other words, since the IPv4 protocol carries data from different other protocols, the value of this field helps the receiving network layer know to which protocol the data belong (see Figure 208)
NETWORK lAYER: INTERNET PROTOCOL
Figure 208 Protocol field and encapsulated data
Transport layer
Network layer
The "aloe of the protoml field defines to which protocol the data belong
The value of this field for each higher-level protocol is shown in Table 104
Table 204 Protocol values
Value
Protocol
ICMP IGMP TCP UDP OSPF
Checksum The checksum concept and its calculation are discussed later in this chapter Source address This 32-bit field defines the IPv4 address of the source This field must remain unchanged during the time the IPv4 datagram travels from the source host to the destination host Destination address This 32-bit field defines the IPv4 address of the destination This field must remain unchanged during the time the IPv4 datagram travels from the source host to the destination host
Example 201
An IPv4 packet has arrived with the first 8 bits as shown: 01000010 The receiver discards the packet Why
Solution
There is an elTOr in this packet The 4 leftmost bits (0100) show the version, which is correct The next 4 bits (0010) show an invalid header length (2 x 4 = 8) The minimum number of bytes in the header must be 20 The packet has been corrupted in transmission
SECTION 202
IPv4
Example 202
In an IPv4 packet, the value of HLEN is 1000 in binary How many bytes of options are being carried by this packet
Copyright © OnBarcode.com . All rights reserved.