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Cisco Networking Essentials by Troy McMillan

By Troy McMillan

An enticing method for a person starting a occupation in networking
As the realm chief of networking services and products, Cisco items are continually turning out to be trendy. but, few books are aimed toward people who find themselves starting a occupation in IT--until now. Cisco Networking Essentials offers an exceptional origin at the Cisco networking services with thorough assurance of basic networking suggestions. writer Troy McMillan applies his years of school room guide to successfully current high-level themes in easy-to-understand phrases for newcomers. With this integral full-color source, you'll fast study the recommendations, methods, and talents which are necessary to administer Cisco routers and switches.* starts with a transparent breakdown of what you could anticipate to profit in each one bankruptcy, by means of a simple dialogue of innovations on middle subject matters* contains instructed labs and overview questions on the end of every bankruptcy, which inspire you to augment and degree your realizing of the subjects mentioned* Serves as an excellent start line for studying Cisco networking items and services
If you have an interest in a profession in IT yet have very little wisdom of networking and are new to Cisco networking items, then this publication is for you.

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Cables are discussed in Chapter 9. Understanding W ANs A wide area network (WAN) is a collection of LANs connected to one another with a WAN technology or with the Internet, allowing it to function as one large network. In the previous section, the impracticality of a company strung together by private Ethernet lines from one office to another was mentioned. Above and beyond the cable length issue, there would be issues of where to place the cables and how to maintain them. The solutions that are available are as follows : • Leasing a WAN connection from a telecommunications company • Using the Internet When a WAN connection is leased from a telecommunications provider, the company offloads all maintenance and simply uses the existing network that the telecommunication provider built.

Layer 5 adds information required to create a session between the web server and the web browser on the laptop. • Layer 4 adds the transport protocol and the source and destination port numbers, in this case TCP (it's a unicast) and port 80 (HTTP). 5. 2. • Layer 2learns the destination MAC address and adds the source and destination MAC addresses, in this case, a source of 5-5-5-5-5-5 and destination of 6-6-6-6-6-6. • Layer 1 converts the entire package into bits and sends it across the network to the laptop.

MAC addresses are not the only type of layer 2 (Data-Link layer) addresses. An example of a WAN protocol, Frame Relay , uses layer 2 addresses called Data-Link Connection Identifiers (DLCis) to identify endpoints in a Frame Relay network. Although they look quite different from MAC addresses, they serve the same purpose. M I WAN protocols such as Frame Relay and their characteristics such as DLCis are beyond the scope of this book. Just as the Network layer identifies the IP address and labels the package with it, the Data-Link layer must do the same for the MAC address.

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