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ccna

<td class="smtext" colspan="1" rowspan="1" width="49"><b>Layer聽#</b></td>
<td class="smtext" colspan="1" rowspan="1" width="70"><b>Name</b></td>
<td class="smtext" colspan="1" rowspan="1" width="100"><b>Mnemonic</b></td>
<td class="smtext" colspan="1" rowspan="1" width="311"><b>Key Words and Description of Function</b></td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">7</td>
<td class="smtext" colspan="1" rowspan="1" width="70">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="100">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="311">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">6</td>
<td class="smtext" colspan="1" rowspan="1" width="70">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="100">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="311">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">5</td>
<td class="smtext" colspan="1" rowspan="1" width="70">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="100">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="311">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">4</td>
<td class="smtext" colspan="1" rowspan="1" width="70">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="100">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="311">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">3</td>
<td class="smtext" colspan="1" rowspan="1" width="70">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="100">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="311">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">2</td>
<td class="smtext" colspan="1" rowspan="1" width="70">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="100">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="311">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">1</td>
<td class="smtext" colspan="1" rowspan="1" width="70">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="100">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="311">聽</td>
</tr>
</table>
                                            </li>
<li>List the seven layers of the OSI model and the encapsulation unit used to describe the data grouping at each layer.
<table border="1" cellpadding="2" cellspacing="0" width="544" bordercolor="#000000">
<tr>
<td class="smtext" colspan="1" rowspan="1" width="49"><b>Layer #</b></td>
<td class="smtext" colspan="1" rowspan="1" width="72"><b>Name</b></td>
<td class="smtext" colspan="1" rowspan="1" width="129"><b>Encapsulation Unit or Logical Grouping</b></td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">7</td>
<td class="smtext" colspan="1" rowspan="1" width="72">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="129">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">6</td>
<td class="smtext" colspan="1" rowspan="1" width="72">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="129">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">5</td>
<td class="smtext" colspan="1" rowspan="1" width="72">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="129">聽</td>

</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">4</td>
<td class="smtext" colspan="1" rowspan="1" width="72">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="129">聽</td>

</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">3</td>
<td class="smtext" colspan="1" rowspan="1" width="72">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="129">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">2</td>
<td class="smtext" colspan="1" rowspan="1" width="72">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="129">聽</td>
</tr>
<tr>
<td class="smtext" align="center" colspan="1" rowspan="1" width="49">1</td>
<td class="smtext" colspan="1" rowspan="1" width="72">聽</td>
<td class="smtext" colspan="1" rowspan="1" width="129">聽</td>
</tr>
</table>
                                            </li>
</ol>
                                    </span>
                                </blockquote>
<p align="left">
                                    <span class="resourceTitle">EXERCISE 2.3.5 OSI MODEL LAYERS - ANSWERS</span>
                                </p>
                                <p align="left">
                                    <span class="resourceAnswerSectionTitle">Step 1</span>
                                </p>
                                <blockquote>
                                    <span class="smtext">
                                        <ol class="resourceAnswer">
<li>List the seven layers of the OSI model from the top to the bottom. Give a mnemonic word for each layer that can help you remember it and then list the key terms and phrases that describe the characteristics and function of each.
<table border="1" cellpadding="2" cellspacing="0" width="544" bordercolor="#000000">
<tr>
<td class="resourceAnswer" colspan="1" rowspan="1" width="49"><b>Layer #</b></td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="70"><b>Name</b></td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="100"><b>Mnemonic</b></td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="311"><b>Key Words and Description of Function</b></td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">7</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="70">Application</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="100">All</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="311">Network processes to applications such as File, Print, Message, Database and Application services. Establishes availability of resources between two nodes. (FTP and Telnet are examples)</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">6</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="70">Presentation</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="100">People</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="311">Data representation, coding (EBCDIC, ASCII), Data transfer syntax, conversion, encryption, formatting and compression services.</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">5</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="70">Session</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="100">Seem</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="311">Interhost communication. Establishes, maintains and terminates connections between applications.</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">4</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="70">Transport</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="100">To</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="311">End-to-End connections. Segments and reassembles data in proper sequence. Setup and teardown of "Virtual Circuits" (connection oriented). Can ensure segment delivery with error correction, recovery and flow control.</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">3</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="70">Network</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="100">Need</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="311">Network/Host addresses and selection of best path through an Internetwork (Routing). Encapsulates upper layer information into "packets". </td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">2</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="70">Data Link</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="100">Data</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="311">Access to media. Adds frame header to upper layer information which contains the hardware address of the destination device or next device on the path. The data Link Layer is divided into 2 sublayers. 1) The Logical Link Control (LLC) and 2) The Media Access Control (MAC).</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">1</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="70">Physical</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="100">Processing</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="311">Binary transmission signals and encoding. Electrical (copper), light (fiber) and physical connections and media (cabling) between network devices.</td>
</tr>
</table>
                                            </li>
<li>List the seven layers of the OSI model and the encapsulation unit used to describe the data grouping at each layer.
<table border="1" cellpadding="2" cellspacing="0" width="544" bordercolor="#000000">
<tr>
<td class="resourceAnswer" colspan="1" rowspan="1" width="49"><b>Layer #</b></td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="72"><b>Name</b></td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="129"><b>Encapsulation Unit or Logical Grouping</b></td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">7</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="72">Application</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="129">Data</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">6</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="72">Presentation</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="129">Data</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">5</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="72">Session</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="129">Data</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">4</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="72">Transport</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="129">Segments</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">3</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="72">Network</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="129">Packets, Datagrams</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">2</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="72">Data Link</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="129">Frames</td>
</tr>
<tr>
<td class="resourceAnswer" align="center" colspan="1" rowspan="1" width="49">1</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="72">Physical</td>
<td class="resourceAnswer" colspan="1" rowspan="1" width="129">Bits</td>
</tr>
</table>
                                            </li>
</ol>
                                    </span>
                                </blockquote>
</td>
                        </tr>
                    </table>
                </td>
            </tr>
        </table>
    </body>
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