By Allan Johnson
I admire this e-book! It includes a pullout 31 day calendar within the entrance, with a number of issues in step with day for research. contained in the publication isn't a host of questions ( so do not anticipate this to be simply one other run of the mill perform exame e-book ), the writer presents an encapsulated evaluate on every one subject, through EXAMPLES of the way to do what used to be simply reviewed. *It's a 31-day, simply readable, condensed completely, textbook! (The ideal significant other on your CCNA perform examination books)
Read Online or Download 31 Days Before Your CCNA Exam: A day-by-day review guide for the CCNA 640-802 exam (2nd Edition) PDF
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Additional info for 31 Days Before Your CCNA Exam: A day-by-day review guide for the CCNA 640-802 exam (2nd Edition)
Port numbers provide TCP (and UDP) a way to multiplex multiple applications on the same computer. Web browsers now support multiple tabs or pages. Each time you open a new tab and request another web page, TCP assigns a different source port number and sometimes multiple port numbers. For example, you might have five web pages open. TCP will almost always assign destination port 80 for all five sessions. However, the source port for each will be different. This is how TCP (and UDP) multiplexes the conversation so that the web browser knows in which tab to display the data.
This feature, among others, has made Ethernet the choice for LAN implementations worldwide. Today we review Ethernet technologies and operation at both the data link and physical layer. 3 is the IEEE standard for Ethernet, and both terms are commonly used interchangeably. 3 both refer to a family of standards that together define the physical and data link layers of the definitive LAN technology. Figure 28-1 shows a comparison of Ethernet standards to the OSI model. 2 standard. 3 standard. The LLC sublayer handles communication between the network layer and the MAC sublayer.
Quality of Service The priority and guaranteed level of service to the flow of data through the network is increasingly important as new applications place greater demands on the processing power and bandwidth of the networks we use. When we place a call over an IP phone, we want at least as good a service as we receive on a traditional land line. Therefore, networks need to use quality of service (QoS) mechanisms to ensure that limited network resources are prioritized based on traffic content.
31 Days Before Your CCNA Exam: A day-by-day review guide for the CCNA 640-802 exam (2nd Edition) by Allan Johnson