Download e-book for kindle: Cisco Certified Network Associate Fast Pass-3rd.Edition by Todd Lammle

By Todd Lammle

ISBN-10: 0470185716

ISBN-13: 9780470185711

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Additional info for Cisco Certified Network Associate Fast Pass-3rd.Edition

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This allows layers to operate transparently to each other, that is, changes in one layer should not impact other layers. 6 Describe the impact of applications (Voice over IP and Video over IP) on a network The main purpose of the Host-to-Host layer is to shield the upper-layer applications from the complexities of the network. ” The following sections describe the two protocols at this layer: Transmission Control Protocol (TCP) User Datagram Protocol (UDP) By understanding how TCP and UDP work, you can interpret the impact of applications on networks when using Voice and Video Over IP.

Routers, by default, break up a broadcast domain—the set of all devices on a network segment that hear all the broadcasts sent on that segment. 2 shows a router in our little network that creates an internetwork and breaks up broadcast domains. 2 shows that each host is connected to its own collision domain, and the router has created two broadcast domains. And don’t forget that the router provides connections to WAN services as well! 35 physical interface on a Cisco router. 2 Describe how a network works Routers create an internetwork.

And since today’s networks are much more reliable than those of yore, this added reliability is often unnecessary. fm Page 20 Thursday, September 27, 2007 11:17 AM 20 Chapter 1 Describe how a network works TCP Segment Format Since the upper layers just send a data stream to the protocols in the Transport layers, I’ll demonstrate how TCP segments a data stream and prepares it for the Internet layer. When the Internet layer receives the data stream, it routes the segments as packets through an internetwork.

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Cisco Certified Network Associate Fast Pass-3rd.Edition by Todd Lammle


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