C h a p t e r 1 n I n t roduC t Ion t o n e t wor k I ng in .NET

Drawer Code128 in .NET C h a p t e r 1 n I n t roduC t Ion t o n e t wor k I ng
C h a p t e r 1 n I n t roduC t Ion t o n e t wor k I ng
Code 128C barcode library on .net
Using Barcode Control SDK for .net vs 2010 Control to generate, create, read, scan barcode image in .net vs 2010 applications.
Figure 1.10 The transport layer specifies the TCP source and destination port numbers that will be used by the upper layer application.
Create uss code 128 on .net
use vs .net barcode 128 generating tobuild code 128 code set c on .net
TCP/IP Layers From: www.alcatel-lucent.com To: www.google.com Message body
Code128b barcode library in .net
Using Barcode reader for .net framework Control to read, scan read, scan image in .net framework applications.
Application services
Visual Studio .NET Crystal bar code generatoron .net
generate, create bar code none on .net projects
Transport
Barcode drawer on .net
generate, create bar code none in .net projects
Source 1223 Destination: 80
Control barcode 128 image on visual c#.net
using .net touse code 128c in asp.net web,windows application
Header
Code-128c barcode library with .net
use an asp.net form code 128c development toreceive code 128 code set b in .net
Body
Internet protocol
Bar Code drawer for .net
use vs .net bar code generator topaint barcode on .net
Network interfaces
Pdf417 2d Barcode generation for .net
generate, create pdf417 none for .net projects
The IP layer provides a common addressing scheme across the network as well as a simple, unreliable datagram forwarding service between nodes in the network. Data from the transport layer is packaged in IP datagrams for transfer over the network. Each datagram travels independently across the network. The intermediate routers forward the datagram on a hop-by-hop basis based on the destination address. This allows for the network to dynamically route around any problems or failures in the network and deliver the packets as efficiently as possible. The packets may arrive out of order, so it is up to the upper layer TCP protocol to reassemble the message correctly. As indicated in Figure 1.11, each datagram contains source and destination addresses that identify the end nodes in the network, and as you have seen, every node in an IP network is expected to have a unique IP address. IP uses the services of the underlying network interfaces such as Ethernet or ATM to accomplish the physical transfer of data. The data link layer is the term used to describe the network interfaces used by IP for physically transmitting the data across the network. The units of data transmitted at the data link layer are usually known as frames. IP datagrams must always be encapsulated in some type of Data Link frame for transmission.
2d Data Matrix Barcode integrating on .net
using barcode encoder for vs .net control to generate, create data matrix image in vs .net applications.
1.4 : OV E RV I E W OF TC P / I P
.net Framework isbn 13 integratingon .net
generate, create isbn bookland ean none for .net projects
Figure 1.11 The network layer adds source and destination IP addresses so that the packet can be forwarded through the network.
ANSI/AIM Code 128 barcode library for .net
generate, create code 128 code set c none with .net projects
TCP/IP Layers Application services From: www.alcatel-lucent.com Message body To: www.google.com
Code 3 Of 9 barcode library with .net c#
use asp.net crystal 39 barcode generator todraw 39 barcode in c#.net
Transport
Control data matrix barcode data for microsoft excel
to make data matrix and datamatrix data, size, image with excel barcode sdk
Source 1223 Destination: 80
Control code128 size in word documents
code-128 size on microsoft word
Header Body
Barcode Code 128 barcode library with vb
generate, create code-128 none in visual basic projects
Internet protocol
Use barcode in office excel
generate, create barcode none on office excel projects
Source: 138.120.191.122 Destination: 197.199.45.12
Java pdf417 draweron java
use java pdf 417 generation toencode pdf 417 with java
Header
Barcode generation on microsoft word
using barcode generation for word control to generate, create barcode image in word applications.
Header Body
Network interfaces
A typical Data Link frame contains a header, usually containing some type of address. The frame also often carries a trailer that contains some type of checksum to verify the integrity of the transmitted data. There are many types of technology used as network interfaces by IP, and they each have their own specific format and rules of operation. As noted earlier, the common characteristic is that the technologies are all capable of carrying IP datagrams. The addressing at this layer identifies the two endpoints of a data exchange to the data link protocol. For example, Figure 1.12 shows the addressing of an Ethernet frame. Some Point-to-Point Protocols such as PPP may not use addresses if there is only one possible destination for the data. After all, you don t need addressing when two network devices can only send information to each other. If it was not obvious from the preceding discussion, routers provide the critical traffic control of the IP datagrams across the Internet. Once the end-user s computer creates the packet and places it on the wire, its job is done until it receives a response. From the user s perspective, the information simply goes into a black box and gets sent to its destination, and a response is received. Behind the scenes, numerous, sometimes dozens, of routers reliably perform their duties accepting packets, examining the destination, looking up the next hop router for delivery, and forwarding the packet on its merry way. Along the way, the packet may cross Ethernet, ATM, Frame-Relay, PPP,
C h a p t e r 1 n I n t roduC t Ion t o n e t wor k I ng
and carrier pigeon to reach its intended destination (OK, maybe not really carrier pigeon, but you get the idea). Figure 1.13 illustrates this concept.
Figure 1.12 The data link layer adds source and destination MAC addresses for forwarding on the local network segments.
TCP/IP Layers Application services Transport From: www.alcatel-lucent.com Message body To: www.google.com
Source 1223 Destination: 80
Header Body
Internet protocol
Source: 138.120.191.122 Destination: 197.199.45.12
Header Header Body
Network interfaces
DA: 00-D0-F6-A4-26-5C SA: 00-20-60-37-BB-5F
Header Header Header
Body
Figure 1.13 Data from applications is sent to the TCP/IP protocol stack where all the appropriate headers are added and the packet is sent on to the network for forwarding to its destination. As the packet travels through the network, the Layer 2 information is changed at each router, but the network, transport, and application information remain unchanged.