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Chapter 6 Data Communication and the Cloud Q1: What Is a Computer Network? Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-2 Q2: What Are the Components of a LAN? SOHO LAN Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-3 LAN Protocol •IEEE 802.3 – Wired LAN •IEEE 802.11 – Wireless LAN – 10/100/1000 Mbps – 802.11n – Up to 600 Mbps – Ethernet – Bluetooth Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-4 Summary of LAN and WAN Networks Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-5 Connecting to an ISP Important ISP functions: 1.Provide a legitimate Internet address 2.Gateway to the Internet 3.Pay for the Internet by collecting money from customers and paying access fees and other charges to telecom Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-6 Q3: What Are the Fundamental Concepts You Should Know About the Internet? Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-7 TCP/IP Protocol Architecture Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-8 Application Layer Protocols • • • • Hypertext Transport Protocol (HTTP) HTTPS – Secure HTTP data transmission Simple Mail Transfer Protocol (SMTP ) File Transfer Protocol (FTP) Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-9 TCP and IP Protocols • Transmission Control Protocol (TCP) – Breaks traffic up into packets and sends each one along its way • IP (Internet Protocol) • Routers Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-10 IP Addressing Public IP Addresses • Identify a particular device on public Internet • Public IP addresses must be unique, worldwide • Assignment controlled by ICANN (Internet Corporation for Assigned Names and Numbers) Private IP Addresses • Identify a particular device on a private network Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-11 IP Addressing (cont'd) Major benefits • Public IP: All devices on LAN share a public IP address • Private IP: Need not register computer with ICANN-approved agencies Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-12 Functions of the LAN Device • Switch processing: IEEE 802.3 wired LAN traffic • Access-point processing: IEEE 802.11 wireless LAN traffic • Translating between IEEE 802.3 and IEEE 802.11 • Converting between Analog and Digital • Assigning private IP addresses • Converting IP address between private and public IP addresses • Routing packets, and more … Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-13 Public IP Addresses and Domain Names • IPv4 – Four decimal dotted notation like 165.193.123.253 • Domain name – Worldwide-unique name affiliated with a public IP address – Affiliation of domain names with IP addresses is dynamic •URL (Uniform Resource Locator) Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-14 Q4: What Processing Occurs on a Typical Web Server? Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-15 Hypertext Markup Language (HTML) Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-16 Q5: Why Is the Cloud the Future for Most Organizations? • What is the Cloud? – Elastic leasing of pooled computer resources over the Internet • Elastic – Dynamically increasing/decreasing of leased resources in short time span, and only pay for resources used Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-17 Why Is the Cloud Preferred to In-House Hosting? Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-18 Why Is the Cloud Preferred to In-House Hosting? (cont’d) Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-19 Why Now? • Technology now supports construction and use of enormous data centers • Processors, data communication, and data storage are so cheap as to be nearly free. • Huge Web farms providing a virtual machine for essentially nothing (1.5¢ per hour). Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-20 When Does the Cloud Not Make Sense? • Law or industry standard practices require physical control over the data • Private cloud – In-house hosting, delivered via Web service standards Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-21 Q6: How Can Organizations Use the Cloud? Three Fundamental Cloud Types Copyright © 2014 Pearson Education, Inc. Publishing as Prentice Hall 6-22