PPT Slides by Dr. Craig Tyran & Kraig Pencil Computer Networking – Part 2 MIS 320 Kraig Pencil Summer 2014

PPT Slides by Dr. Craig Tyran & Kraig Pencil A. Game Plan Introduction (Part 1 notes) Distributed processing (Part 1 notes) Client/Server processing (Part 1 notes) Local area networks (Part 1 notes) Wide area networks Wireless networks Cloud Computing

PPT Slides by Dr. Craig Tyran & Kraig Pencil H. Wide Area Networks 1. Wide area network (WAN) –May span 100s  1000s of miles  globe –May connect LANs –Organizations often lease communication lines (from AT&T, Verizon-MCI, Sprint, etc.) to establish a private network –Common for international organizations –If all of an organization is hooked up, call it an “Enterprise Network” –Example: See figure next slide

PPT Slides by Dr. Craig Tyran & Kraig Pencil LANs and Wide Area Network at Metropolitan Life Insurance Co. LANs (Located at regional office) WAN

PPT Slides by Dr. Craig Tyran & Kraig Pencil H. Wide Area Networks (cont.) 2. The Internet: A type of WAN: A network of networks Evolution When was it created? Why was it created? Who were the early users?? “Top innovation” of past 25 years CNN (1/18/05)1/18/05 Governance The Internet Society Source:

PPT Slides by Dr. Craig Tyran & Kraig Pencil H. Wide Area Networks (cont.) 3. Virtual private network (VPN) A “virtual” software extension of a private network. It has no hardware of its own. It transmits over a public network (usually the Internet). VPN software protects the security of the internal network by requiring authorization. It protects transmitted data through encryption. Example : sales people in the field can log into the internal network from anywhere over the Internet. Advantages Flexible: connect from anywhere More secure than basic Internet Less expensive than leased WAN Image Source: apr.com/vpn/ apr.com/vpn/

PPT Slides by Dr. Craig Tyran & Kraig Pencil VPN at WWU

PPT Slides by Dr. Craig Tyran & Kraig Pencil H. Wide Area Networks (cont.) 4. Does the Internet = World Wide Web (WWW)? –Internet  Describes the computer network infrastructure –WWW  An information sharing approach used by clients/servers on Internet Invented ( ) by Tim Berners-Lee Composed of a “web” of documents with links to other documents Hosted by client-servers connected to the Internet Uses a “browser” application to display the document Illustration:

PPT Slides by Dr. Craig Tyran & Kraig Pencil H. Wide Area Networks (cont.) 4. Internet = WWW? (continued) WWW uses “HTTP”: Hyper Text Transport Protocol –Defines how messages are formatted and transmitted What happens when you submit a URL via web browser? –Determine protocol –Find the server –Request/display file

PPT Slides by Dr. Craig Tyran & Kraig Pencil WWW Popularized Internet Usage WWW developed Internet developed

PPT Slides by Dr. Craig Tyran & Kraig Pencil Running out of Internet “bandwidth”? bandwidth-international-net-links-add-13tbps-in-2010.arshttp://arstechnica.com/tech-policy/news/2010/10/now-thats- bandwidth-international-net-links-add-13tbps-in-2010.ars acity.htmlhttp:// acity.html 2008 – often predicted we will run out of capacity (“bandwidth”) by Growth of International Internet Bandwidth What do you think?

PPT Slides by Dr. Craig Tyran & Kraig Pencil I. Wireless Networks 1.A new frontier ?? 2.Types of wireless networks Wireless local area networks (WLANs) Personal area networks (PANs) Wireless metropolitan area networks (WMANs)

PPT Slides by Dr. Craig Tyran & Kraig Pencil I. Wireless Networks (cont.) 3a. Wireless local area networks (WLANs) Similar to a LAN, without the cables A fast-growing network technology for businesses (and individuals) e.g., Laptop usage 2002: 20% of business laptops 2007 (est.): 99% of laptops e.g., Business networking UPS, hospitals

PPT Slides by Dr. Craig Tyran & Kraig Pencil I. Wireless Networks (cont.) 3b. WLAN: What is Wi-Fi? Wi-Fi: “Wireless Fidelity” Based on “IEEE ” set of protocol standards Ethernet with CSMA/CD Short range transmitter-receiver (up to 300 ft) communicates with Wi-Fi NIC receiver card/antenna  54 Mbps Sources: NetGear, Linksys

PPT Slides by Dr. Craig Tyran & Kraig Pencil I. Wireless Networks (cont.) 3c. WLAN: “Hot spots” Location that offers access to Wi-Fi network e.g., WWU Red Square, Starbucks, airports, hotels Want to find a hot spot? CNET Hotspot ZoneHotspot Zone 3d. WLAN: Concerns Limited range Security “War driving” Eavesdropping Wi-Fi typically needs to have security features enabled and configured (see ) Image sources: Starbuck, WWU,

PPT Slides by Dr. Craig Tyran & Kraig Pencil I. Wireless Networks (cont.) 4. Personal area networks (PANs) –Network for devices close to one’s person e.g., phone, PDA, computer, wireless barcode scanner –Bluetooth technology (IEEE ) Can link multiple devices within 30 feet 1 Mbps + transmission rate –Example applications Earpiece for cell phone Package scanning for UPS Wireless mouse/keyboard

PPT Slides by Dr. Craig Tyran & Kraig Pencil I. Wireless Networks (cont.) 5. Wireless metropolitan area networks (WMANs) –One approach: WiMax Based on “IEEE ” set of protocol standards –Advantages Broad range (up to 31 miles) High speed transmission (75 Mbps) Wireless –Implications … Will WiMax (or something like it) replace Internet cable-modem and DSL service? Historical progression: 1G: analog cell phone 2G: digital cell phone 3G: digital cell phone + Internet 4G: high speed 3G

PPT Slides by Dr. Craig Tyran & Kraig Pencil Cloud Computing Not cloud  Your data and app is on your computer Cloud  Your data or app is on a server on the Internet Also Cloud  Your data or app can be on any of multiple servers on the Internet

PPT Slides by Dr. Craig Tyran & Kraig Pencil Latest Hot Topic: Cloud Computing “Cloud” = “Internet” Instead of running an application on your own computer, use a service from the web that does about the same thing. Example –Use Google Apps instead of Microsoft Office applications. Hypervisor introduction from VMware Some PR Videos for the Cloud “SalesForce.com” offers CRM (customer relationship management) services “in the cloud”. NwK_ms The key idea in this video is that cloud computing gives you the flexibility to change quickly when necessary. Q23xg We talked about servers – now virtual servers!– QiL3gs