By Matt Walker, Angela Walker
The top absolutely built-in research method on hand for CCENT examination 640-822
With enormous quantities of perform questions and hands-on routines, CCENT Cisco qualified access Networking Technician learn Guide covers what you want to know--and indicates you ways to prepare--for this difficult examination.
100% entire assurance of all legitimate ambitions for examination 640-822:
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- contained in the examination sections in each bankruptcy spotlight key examination issues coated
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Covers all CCENT examination themes, including:
OSI Reference version · TCP/IP · community Media and units · Ethernet criteria · Switching · Routing · IP Addressing · IP tackle Subnetting · IOS and Configuration records · CLI · Cisco swap and Router Configuration · WANs and WLANs · functions, protection, and Troubleshooting
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Read or Download CCENT Cisco Certified Entry Networking Technician Study Guide (Exam 640-822) (Study Guide Book & CD) PDF
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As a last examination practise device, the CCNP instant (642-732 CUWSS) speedy Reference offers a concise evaluate of all goals at the new exams. the quick booklet presents readers with specified, graphical-based details, highlighting purely the foremost issues in cram-style structure. With this record as your advisor, you'll evaluation themes on recommendations and instructions that follow to this examination.
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Additional resources for CCENT Cisco Certified Entry Networking Technician Study Guide (Exam 640-822) (Study Guide Book & CD)
The Application layer holds the protocols that allow programs to access and make use of a network. For example, Microsoft Outlook—a common e-mail program—can work just fine without a network. You can open, edit, create, and delete e-mails offline just as well as you can online. However, if you wish to use the network to send and receive e-mail, you need an Application layer protocol to do this. In this example, the Application layer protocol would be SMTP. Continuing the e-mail analogy, imagine you are sending an e-mail from a Microsoft Outlook application to a computer running the Thunderbird e-mail application.
The individual protocols mentioned will be discussed in greater detail in Chapter 2. Figure 1-2 displays the seven layers. FIGURE 1-2 The OSI Reference Model layers Application layer (7) Presentation layer (6) Session layer (5) Transport layer (4) Network layer (3) Data Link layer (2) Physical layer (1) The OSI Reference Model 13 Because the OSI model acts as a foundation for the rest of networking, it’s very important that you thoroughly understand the stack. It is essential you be able to identify: ■ The order of the layers, from top to bottom, and bottom to top ■ The number that corresponds to each layer ■ The function(s) of each layer ■ The protocols and devices that work at each layer Memorizing the layers and their numbers is actually fairly easy using a mnemonic.
CCENT Cisco Certified Entry Networking Technician Study Guide (Exam 640-822) (Study Guide Book & CD) by Matt Walker, Angela Walker