Download e-book for kindle: CCNA Certification All-In-One For Dummies by Silviu Angelescu

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By Silviu Angelescu

ISBN-10: 0470489626

ISBN-13: 9780470489628

A whole instruction consultant for the entry-level networking CCNA certification. in case you are making plans to enhance your occupation by means of taking the all-important Cisco qualified community affiliate (CCNA), this can be the examine advisor you would like! Seven minibooks disguise the entire options and themes on which you may be established, masking the newest model of the examination. every one a part of the examination is roofed completely in its personal part, so that you can comfortably locate the data you need to examine. lots of evaluate questions assist you arrange, and the significant other CD-ROM comprises the hugely rated Dummies try out Engine so that you can try your development with questions in accordance with examination content material.

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Example text

Layer 6: Presentation This layer is mostly concerned with data format. It converts the data between different formats so that both the sender and the receiver can use heterogeneous data. For example, mail messages contain various data formats: text, application attachments, video, audio, and graphical signature. ✦ The presentation layer on the sending host receives the data payload from the application layer. ✦ The presentation layer on the sending host converts the data into a format that is easily transportable over the network.

X (Ethernet) standard. info Introducing the TCP/ IP Protocol Suite ✦ ARP: Address Resolution Protocol is used to resolve (find) the physical (MAC) address of a host or network device, when only its logical (IP) address is known. info Chapter 4: Data Encapsulation Exam Objectives ✓ Describing data encapsulation ✓ Describing how data encapsulation relates to the OSI network reference model ✓ Describing how data encapsulation enables the layers of the OSI network reference model to be independent of each other ✓ Describing protocol data units (PDUs) and showing how they relate to data encapsulation R ead this chapter to find out about data encapsulation: what it is, how it works, and what its purpose is.

The sending and the receiving host then negotiate connection parameters. 3. The receiving host replies with a TCP “Synchronize” (SYN) message that contains the receiver starting sequence number. This message also sends an acknowledgment (ACK) to the sending host, indicating that the receiving host did receive the first TCP “Synchronize” message. 4. The sending host sends back an acknowledgment (ACK) to the receiving host to let it know that it did receive the receiver starting sequence number and that it is ready to send.

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CCNA Certification All-In-One For Dummies by Silviu Angelescu

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