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

By Silviu Angelescu

A whole guidance consultant for the entry-level networking CCNA certification. if you are making plans to develop your profession by way of taking the all-important Cisco qualified community affiliate (CCNA), this is often the research consultant you wish! Seven minibooks hide the entire recommendations and themes on which you will be confirmed, masking the most recent 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 knowledge you need to examine. lots of evaluate questions assist you organize, and the spouse CD-ROM contains the hugely rated Dummies try Engine so that you can try out your development with questions in keeping with examination content material.

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For example, MIME is a Layer 6 protocol that is used by e-mail software programs and Web browsers (Layer 6 applications) to convert e-mail contents that are not text into a data format that can be viewed, rendered, or otherwise processed on the computer host. Some TCP/IP protocols at Layer 6 The following TCP/IP protocols are found at Layer 6: ✦ MIME: Multipurpose Internet Mail Extensions are used to allow e-mail applications to convert e-mail message contents other than text into a data format that is supported on the receiving host.

Every host has a logical (IP) address and a physical (MAC) address. On the other hand, more than one network application may be running on each host. For example, you can have an e-mail program and a Web browser open at the same time on your host. So, how does your Web browser connect to a Web server, considering that the Web server host has only one IP address and may also be running an e-mail server application? Answer: By using standard TCP/IP ports. A standard TCP/IP port exists for HTTP (the protocol used by Web browsers), a standard TCP/IP port exists for SMTP (the protocol used by some e-mail readers), and so on.

All traffic flows through the central device. The star topology is also known as a hub-and-spoke topology. Ethernet networks using hubs or switches and twisted-pair cabling are star topologies. ✦ Ring: Hosts are connected sequentially in a daisy-chain fashion, as shown in Figure 1-3. Traffic flows around the ring. The last host in the ring is connected to the first host, thereby closing the ring. Token Ring is the typical ring topology example. Fiber Distributed Data Interface (FDDI) is also a ring topology.

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