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Download e-book for iPad: Best Damn Cisco Internetworking Book Period by Wayne Lawson

By Wayne Lawson

The simplest rattling Cisco Internetworking publication interval exhibits readers every little thing they should learn about all Cisco internetworking issues. The ebook offers an figuring out of Cisco's present VoIP strategies and the skill to place them to paintings. It exhibits tips on how to configure all of Cisco's center VoIP items. moreover, Cisco instant applied sciences are coated intimately, together with assurance of the entire Cisco protection items.

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CSMA/CD versus Deterministic Access In LANs, there are two predominant methods of controlling access to the physical medium: CSMA/CD and deterministic access. CSMA/CD is the access method for Ethernet. qxd 18 10/15/03 9:22 AM Page 18 Chapter 1 • Cisco Technologies, Routers, and Switches can be likened to the rules you would follow in a meeting. ” If you want to speak, you need to listen to see if anyone is else is speaking before you begin. If someone else is speaking, you must wait until they are finished.

HTTP, SMTP, FTP,Telnet, and rlogin are examples of applications that use TCP for transport. Applications that need reliability support from the Transport layer use RPC over TCP. Applications that do not depend on the Transport layer for reliability use RPC over UDP. 5 shows the establishment of a TCP/IP connection. ” 1. To initiate the connection, the source host sends a SYN segment (the SYN flag is set), and an ISN in the sequence number field to the destination port and the host address. 2. The destination host responds with a segment containing its ISN.

Since connections are not set up and torn down, there is very little overhead. Lost, damaged, or out of order segments will not be retransmitted unless the Application layer requests it. UDP is used for fast, simple messages sent from one host to another. Due to its simplicity, UDP packets are more easily spoofed than TCP packets. If reliable or ordered delivery of data is needed, applications should use TCP. The UDP header and its data are encapsulated as payload for an IP packet, as the figure shows.

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