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To move past the physical MAC addresses and start using logical addressing requires some special software, usually called a network protocol Network protocols exist in every operating system A network protocol not only has to create unique identifiers for each system, but must also create a set of communication rules for issues like how to handle data chopped up into multiple packets, and how to make sure that those packets get from one subnet to another Let s take a moment to learn a bit about the most famous network protocol TCP/IP and its unique universal addressing system To be accurate, TCP/IP is really several network protocols designed to work together but two protocols, TCP and IP, do so much work the folks who invented all these protocols named the whole thing TCP/IP TCP stands for Transmission Control Protocol, and IP stands for Internet Protocol IP is the network protocol I need to discuss first; rest assured, however, I ll cover TCP in plenty of detail later NOTE TCP/IP is the most famous network protocol, but there are others

More and more companies today are relying on Web servers for the exchange of information in areas such as e-commerce, marketing, and advertising Until now, the focus has been on the servers themselves Organizations have implemented upgrades and redundant servers hoping to provide customers with better service and reliability Cisco has taken a different approach it has created external hardware and software solutions that assist in increasing efficient and reliable access to these servers This chapter discusses the Web-based services provided by Cisco's hardware and software solutions The three tools described here are DistributedDirector and LocalDirector, which address load distribution and balancing of Web traffic, and the Cisco Web browser interface for hardware configuration

The IP protocol is the primary protocol that TCP/IP uses at Layer 3 (Network) of the OSI model The IP protocol makes sure that a piece of data gets to where it needs to go on the network It does this by giving each device on the network a unique numeric identifier called an IP address An IP address is known as a logical address to distinguish it from the physical address, the MAC address of the NIC Every network protocol uses some type of naming convention, but no two protocols use the same convention IP uses a rather unique dotted decimal notation (sometimes referred to as a dotted-octet numbering system) based on four 8-bit numbers Each 8-bit number ranges from 0 to 255, and the four numbers are separated by periods (If you don t see how 8-bit numbers can range from 0 to 255, don t worry By the end of this book, you ll understand these naming conventions in more detail than you ever believed possible!) A typical IP address might look like this: 1921684232 No two systems on the same network share the same IP address; if two machines accidentally receive the same address, they won t be able to send or receive data These IP addresses don t just magically appear they must be configured by the end user (or the network administrator) Take a look at Figure 2-26 What makes logical addressing powerful are the magic boxes called routers that separate each of the subnets Routers work like a hub, but

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In this section, you'll get to know Cisco's DistributedDirector product, which is designed to provide dynamic, transparent, scalable Internet traffic load distribution between geographically dispersed servers Today's innovative companies are using the Web to provide software distribution, customer service, and other business transactions The resulting exponential growth of the global Internet is challenging these same companies with the following scalability issues: Sustaining high server availability Maintaining server performance Reducing costs of server operations/administration

The CompTIA Network+ certification exam expects you to know how to 13 Identify the following address formats: IPv6 15 Identify common IPv4 and IPv6 routing protocols, such as link state, distance vector, and hybrid To achieve these goals, you must be able to Discuss the fundamental concepts of IPv6 Describe IPv6 practices Implement IPv6 in a TCP/IP network

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