vb.net qr code generator source code 10: Securing Network Traffic in Objective-C

Print Data Matrix in Objective-C 10: Securing Network Traffic

CHAPTER 10: Securing Network Traffic
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window open. Some Internet appliances and filtering packages can be configured to tag traffic that appears to be P2P, tracking the session based on these tags, and thus overcoming any reliance on blocking traffic on any specific port.
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Client-Server Networks
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Over the years, as networks grew, they became unwieldy, making it more difficult to keep tabs on the computers that were linked together. This led to the development of client-server networks. Client-server networks are not ad hoc. Services on client-server networks are statically provisioned and centrally managed. In this model, much of the management of the network assigning IP addresses, warehousing data, and managing bandwidth happens at the server level, and not on the individual workstations. Because of this, client-server networks quickly became the primary weapon in combating unwieldy networks (Figure 10 2 for a graphical representation of a clientserver network).
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Figure 10 2. An example of a client-server network
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CHAPTER 10: Securing Network Traffic
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Understanding Routing
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As data moves between networks, you need to tell it where to go. Moving data through networks is called routing. In the following sections, we ll show how to route data packets and how to secure the routing techniques used to move that data along. First, we will explain a packet, and then we will move on to explain the various types of devices that packets will encounter as they traverse the Internet. This includes gateways, routers, and firewalls.
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To understand how routing data works, we first need to explore what a packet is. A packet is a general term for a bundle of data, organized in a predetermined way for transmission over computer networks. IP packets consist of two parts, the header and the data. The header marks the beginning of the packet and contains information, such as the size of the payload and the source and destination address. The data is the information being carried by this particular packet. NOTE: Packets are sometimes referred to as datagrams. The terms are not interchangeable, however. A datagram is a type of packet, but not all packets are datagrams. Different protocols use different conventions for distinguishing between different sections of a packet, and for formatting the data. The Ethernet protocol establishes the start of the header and the other data elements by their relative location to the start of the packet. For the purposes of understanding other technologies discussed throughout this chapter, just keep in mind that there are different ways to form a packet based on the protocol that is being used. A good analogy when thinking about packets is to treat data transmission like moving into a new house. When moving our things, we tend to be efficient. Instead of loading one piece of furniture on to the truck, driving to the new house, unloading it, and then driving back for another piece, we move multiple pieces at a time. We also don t cram everything into one giant box. We load our stuff from one room and put it in a box (or boxes) and label it. The header is the container (or box) for data (our stuff). The application packing up the data writes the name of the data in the header, much like we would write where the stuff in the box would go on a label on the box. This allows the network router (or movers) to know which room each box is destined for and typically which room the stuff came from. The router (or moving truck) will create a list of what was transmitted (moved). Most transfers of data will move more than one packet (box), breaking files into data packets (boxes) to move them more efficiently.
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Gateways
A gateway is a device that connects two physical or logical networks. Some gateways mediate between networks that use different base protocols, and some relay traffic
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