1 / 19

HTM 304 Fall 07

Introduction to Management Information Systems Chapter 5 Data Communications and Internet Technology. HTM 304 Fall 07. Content. 5-layer Architecture for Communication Internet Enterprise Network Wireless. Last Time: The 5-Layer Model. Hardware Layer: Set the devices

prema
Télécharger la présentation

HTM 304 Fall 07

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction to Management Information SystemsChapter 5 Data Communications and Internet Technology HTM 304 Fall 07

  2. Content • 5-layer Architecture for Communication • Internet • Enterprise Network • Wireless

  3. Last Time: The 5-Layer Model Hardware Layer: Set the devices ready for communication.

  4. Layer 3: Internet Layer • Runs the IP protocol • Data received from the above layers are divided into packets. • Key design issue – to determine how packets are routed from source to destination. • Routing: selecting paths – shorter route, avoiding heavy traffic, etc. • Router: special-purpose computing devices that process IP protocol – examine the destination IP addresses and decide where to send them.

  5. IP Address (IPv4) • Layer 3 handles IP address. • The Logical Addresses • Assigned when you get online, not permanently tied with the MAC address • Why? Don’t have to update every time a NIC is changed • An IP address is four bytes, totally 32 bits. • How many in total? • You can either specify your IP address (as most of the company’s server), or let the ISP assign one dynamically.

  6. IPv6 • Windows Vista has adopted IPv6. • Totally 128 bits (=16 bytes) instead of 32 bits (=4 bytes) • How many total IPv6 addresses? 2128 3.4 * 1038 addresses • Approximately 5 * 1028 addresses * 6.5 billion people alive today. • Example of address: (8 Hexadecimal digits) 2001:0db8:85a3:08d3:1319:8a2e:0370:7334

  7. Exercise: Find your IP address • How to find your IP address? • “start”  “run”: type “cmd” and click ok, the command prompt window will pop up • Type command “ipconfig” to observe the report • Use “ping” command to check the connectivity between two computers

  8. Router – 3rd Layer Equipment Packets: Original IP – source IP + Data Computer A Computer B Frames: Original MAC – Next MAC + Packets Router A (can actually many) Data Link Data Link

  9. Explain: Why Router? – handle address Can be substituted by a computer with routing Programs installed. Multiple NICs needed.

  10. Layer 4 Transport Layer • Handles transport protocol: TCP or UDP – software protocols Once paths from computer A to B is found, an end-to-end connection is established on the 4th layer. Meaning data can be transferred. Data Link Data Link Point-to-point Router A (can actually many) Computer A Computer B

  11. Layer 4 Protocols • TCP: Transmission Control Protocol • Receive data and transmission request from Layer 5 (application layer) • Send communication request to layer 3, layer 3 will then find one or more route to the destination computer. • Destination computer send acknowledge back, indicating there is end-to-end connection. • Break data from layer 5 into segments, and send each segments with confirmation. (destination computer send acknowledge upon receiving every segment) • UDP: User Datagram Protocol • Designed for short messages • Does almost everything the same as the TCP, except not requesting confirmation. • Faster, more efficient for short messages and time-sensitive application

  12. Layer 5 The Application Layer • Layer 5 protocols for applications such as browsers, email, file transfer, etc. • A standard email protocol Simple Mail Transfer (SMTP) • Web page processing Hypertext Transfer Protocol (HTTP) • File Transfer Protocol (FTP) • It governs how applications work with each other. (e.g. Firefox v.s. IE 7)

  13. Review of the 5 layers • See your handout

  14. Review the Data Process

  15. Exercise • Which of the following is referred to as the network cable? • Coaxial Cable • Fiber Optic Cable • Unshielded Twisted Pair • Twisted Pair Copper

  16. More exercise? • What is the name of data unit transferred on the 2nd layer? • Packet • Bytes • Package • Frame • Segment

  17. Explain IEEE 802? • Which of the following standard in IEEE 802 is referred to as Ethernet? • IEEE 802.11 • IEEE 802.15 • IEEE 802.3 • IEEE 802.5

  18. Describe the three topologies mainly used to connect a LAN. Describe the pros and cons. • Which one can be extended to a large geographic area • Which topology corresponds to the Ethernet? • Describe the difference between an “end-to-end” connection and a “point-to-point” connection?

  19. Multiple Choices • __________ contains the destination computer’s IP address in its header. • A frame • A segment • A packet • An email message

More Related