DCN_Ch_01 - Introduction to Data Comunications_Aug 31, 2023.pdf

Data Communications & Networking Introduction to Data Communications Dr. Ramakrishna Dantu College of Business Intro to Data Communications Topics • Introduction • Data Communications Networks • Network Models • Network Standards • Future Trends • Cybersecurity Issues Types of Network Types of...

Data Communications & Networking Introduction to Data Communications Dr. Ramakrishna Dantu College of Business Intro to Data Communications Topics • Introduction • Data Communications Networks • Network Models • Network Standards • Future Trends • Cybersecurity Issues Types of Network Types of Network Network Architecture Components • Access Layer  Local Area Network • Distribution Layer  Building Backbone Network • Core Layer  Campus Backbone Network • Data Center • Wide Area Network Access • Internet Access • e-Commerce Edge Types of Network Network Architecture Components • Access Layer  Local Area Network • Distribution Layer  Building Backbone Network • Core Layer  Campus Backbone Network Types of Network Categories of Network • Common way is to categorize based on geographic scope of the network.  Local Area Networks (LANs)  Backbone Network (BN)  Wide Area Networks (WANs) • This categorization is becoming blurry because some network technologies now used in LANs were originally developed for WANs. Types of Network Local Area Network (LAN) and Backbone Network (BN) • Local area network (LAN)  Is a group of computers located in the same general area. A LAN covers a clearly defined small area  E.g., one floor or work area, a single building, or a group of buildings.  LANs support high-speed data transmission commonly operating 100 million bits per second (100 Mbps).  Most LANs are connected to a backbone network (BN) Types of Network Local Area Network (LAN) and Backbone Network (BN) • Backbone Network (BN)  BN is a larger, central network connecting several LANs, other BNs, MANs, and WANs.  BNs typically span from hundreds of feet to several miles and provide very highspeed data transmission, commonly 100–1,000 Mbps. Types of Network Wide Area Networks (WANs) • They connect BNs and MANs. • Most organizations do not build their own WANs by laying cables, building microwave towers, or sending up satellites. • Most organizations lease circuits from IXCs (e.g., AT&T, Sprint) and use those to transmit their data.  Interexchange Carriers: A telecommunications carrier, typically referred to as a “long-distance carrier.” • WAN circuits provided by IXCs typically  span hundreds or thousands of miles and  provide data transmission rates from 64 Kbps to 10 Gbps. Types of Network Intranet • An intranet is a LAN that uses the same technologies as the Internet (e.g., Web servers, Java, HTML) but is open to only those inside the organization. • For example  Some pages on a Web Server are available only to the employees and are hidden from those who connect to the Web Server from the Internet at large. • Sometimes, an intranet can be provided by a completely separate Web server hidden from the Internet. • The intranet at Sac State, for example, provides information on faculty, class scheduling for future semesters (e.g., room, instructor), etc.,. Types of Network Extranet • It is similar to an intranet. • Uses the same technologies as the Internet • It is provided to invited users outside the organization who access it over the Internet. • It can provide access to:  information services, inventories, and other internal organizational databases that are provided only to customers, suppliers, or those who have paid for access. • Typically, users are given login ID and passwords to gain access, but more sophisticated technologies such as smart cards or special software may also be required. • Many universities provide extranets for Web-based courses so that only those students enrolled in the course can access course materials and discussions. Thank You