EUT 122 Skills and Technology in Communication

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Presentation transcript:

EUT 122 Skills and Technology in Communication Miss Zainab Nazar Khalil Wafi Miss Wan Nor Ashiqin Wan Ali Lecturers IKOM / Jajawi Email: zainabwafi@unimap.edu.my wanashiqinwanali@yahoo.com

NETWORKS: COMMUNICATION TECHNOLOGY TOPIC 3 NETWORKS: COMMUNICATION TECHNOLOGY

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY Communications is the process of sending and receiving messages electronically between two points. REQUEST DATA This is Figure 7.3. REPLY DATA *

COMMUNICATION TECHNOLOGY * 07/16/96 A communications channel is a path used to send and receive messages. A1 B1 C1 A2 B2 This is Figure 7.3. C2 Path 1: A1----A2 Path 2: B1----B2 Path 3: C1----C2 *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY Communication devices convert data into signals to travel over a medium. Computers Modems Routers Switches Network interface cards (NICs) This is Figure 7.3. *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY A node is any device connected to a network. 1) Network interface card (NIC) An expansion board or adapter that provides a connection between the computer and the network Notebook computers have wireless NICs *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY 2) Routers Connect two or more networks Determine the best route to transmit data 3) Switches Filter and forward data between nodes Are similar to routers but work within a single network *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY 4) Wireless access point Receives and transmits radio signals Joins wireless nodes to a wired network This is Figure 7.5. *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY 5) File server High-speed computer that provides program and data files to network users Contains the network operating system (NOS) Internet services support Protection of services and data Access to connected hardware by authorized users *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY Communication technology is consists of wired technology and wireless technology. Wired technology refers to the transmission of data through a wire medium of communication. Wireless technology is a type of data communication that is performed and delivered wirelessly. connecting and communicating between two or more devices using a wireless signal through wireless communication devices. This is Figure 7.3. *

COMMUNICATION TECHNOLOGY * COMMUNICATION TECHNOLOGY 07/16/96 Wired technology Transmission Coaxial cable Telephone lines Twisted pair cable USB cable Communication medium Public Switched Telephone Network (PSTN) Coaxial cable This is Figure 7.3. Twisted pair cable *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY Wireless technology Transmission Broadcast radio Infrared Satellite Microwave Radio (Cellular) Bluetooth Communication medium Wireless Application Protocol (WAP) General Packet Radio Service (GPRS) Voice over IP (VoIP) This is Figure 7.3. *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY Wired and wireless applications Internet telephony, or VoIP (Voice over Internet Protocol) Offers computer-to-phone and phone-to-phone transmission through the Internet Videoconferencing transmits sound and video images to people in different locations using: Video camera Skype software This is Figure 7.3. *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY Wired and wireless applications Facsimile transmission (fax) transmits documents over a telephone line or the Internet using either: A standalone fax machine, or A computer with a fax modem and a scanner Satellite technology Satellite radio GPS (Global Positioning System) This is Figure 7.3. *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY Wired and wireless applications Text messaging using a cell phone for applications previously used on computers Instant messaging Brief e-mail Picture messaging Transmits color pictures and backgrounds Cellular telephone acts as a camera This is Figure 7.3. *

COMMUNICATION TECHNOLOGY * 07/16/96 COMMUNICATION TECHNOLOGY A network links multiple computer systems to enable them to share data and resources. Categories of computer networks for business and organizations: Local area network (LAN) Wide area network (WAN) *

Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall NETWORK STRUCTURES Structure of LAN Structure of WAN Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall

NETWORK FUNDAMENTALS LAN Uses cables, radio waves, or infrared signals * 07/16/96 NETWORK FUNDAMENTALS LAN Uses cables, radio waves, or infrared signals Links computers in a limited geographic area *

NETWORK FUNDAMENTALS WAN Uses long-distance transmission media * 07/16/96 NETWORK FUNDAMENTALS WAN Uses long-distance transmission media Links computer systems a few miles or thousands of miles apart The Internet is the largest WAN *

LOCAL AREA NETWORK 1) Peer-to-peer (P2P) networks * 07/16/96 LOCAL AREA NETWORK 1) Peer-to-peer (P2P) networks Share files without a file server Are easy to set up Are best used for home or small offices with no more than 10 computers Do not require a network operating system Can be slow if there are too many users Security is not strong *

LOCAL AREA NETWORK 2) Client/server networks * 07/16/96 LOCAL AREA NETWORK 2) Client/server networks Made up of one or more file servers and clients (any type of computer) Client software enables requests to be sent to the server Wired or wireless connections Do not slow down with heavy use *

LOCAL AREA NETWORK 3) Virtual private network (VPN) * 07/16/96 LOCAL AREA NETWORK 3) Virtual private network (VPN) Operates over the Internet Is accessible by authorized users for quick access to corporate information VPN is a method by which a user can access an organization's internal network over the Internet in a secure manner. *

LOCAL AREA NETWORK LAN topologies * 07/16/96 LOCAL AREA NETWORK LAN topologies Network topology is the physical design of a LAN. Network topology is the layout pattern of interconnections of the various elements Topology can be understood as the shape or structure of a network. *

LOCAL AREA NETWORK LAN topologies Bus topology * 07/16/96 LOCAL AREA NETWORK LAN topologies Bus topology Practical for home or small office One node transmits at a time Star topology For office buildings, computer labs, and WANs Easy to add users Ring topology For a division of a company or one floor Not in common use today *

* 07/16/96 BUS TOPOLOGY This is Figure 7.11. *

* 07/16/96 STAR TOPOLOGY This is Figure 7.12. *

* 07/16/96 RING TOPOLOGY This is Figure 7.13. *

Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall WIDE AREA NETWORK A Wide Area Network (WAN) is a telecommunication network that covers a broad area. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall

WIDE AREA NETWORK WAN protocols Internet protocols * 07/16/96 WIDE AREA NETWORK WAN protocols Internet protocols Transmission Control Protocol (TCP) Defines how Internet-connected computers can exchange, control, and confirm messages Internet Protocol (IP) Provides a distinct identification to any computer connected to the Internet: the IP address TCP/IP Together, they define how the Internet works. *

IP--->>>TCP--->>>TCP/IP

WIDE AREA NETWORK WAN protocols Circuit switching Packet switching * 07/16/96 WIDE AREA NETWORK WAN protocols Circuit switching Used by the public switched telephone network to send data over a physical end-to-end circuit Provides a direct connection between devices Packet switching Used for computer communication Divides and sends outgoing messages as packets, which are reassembled upon receipt More efficient and less expensive than circuit switching *

HOME NETWORK Wired Home Networks * 07/16/96 HOME NETWORK Wired Home Networks Ethernet networks link computers with a switch or router. This is Figure 7.23. *

HOME NETWORK Wireless Home Networks Wi-Fi is the wireless standard. * 07/16/96 HOME NETWORK Wireless Home Networks Wi-Fi is the wireless standard. Uses radio signals Communicates through network access points Needs wireless adapter or router This is Figure 7.25. *

HOME NETWORK Setting up a home network Planning Select technology * 07/16/96 HOME NETWORK Setting up a home network Planning Select technology Purchase equipment and firewall software Configuring a wired network Connect each computer to the router Plug printer, scanner, etc., into a computer *

HOME NETWORK Setting up a home network Setting up a wireless network * 07/16/96 HOME NETWORK Setting up a home network Setting up a wireless network Connect each node to wireless router with a wireless adapter Connect DSL or cable modem to wireless router Maintenance and support Minimal maintenance required Unplug power source from router and other peripherals and restart computer to correct problems *

* 07/16/96 SUMMARY The two main types of networks are Local Area Networks (LANs) and Wide Area Networks (WANs). *

* 07/16/96 SUMMARY Two main categories of LANs are peer-to-peer (P2P) and client/server. Topologies of a LAN include the bus topology, the ring topology, and the star topology. Protocols define the manner in which network devices communicate. *

THE END