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Networks

Networks. LANS,. FastPoll True Questions Answer A for True and B for False. A wireless infrastructure network uses a centralized broadcasting device, such as a wireless access point or router. Wireless networks are less secure than wired networks.

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Networks

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  1. Networks LANS,

  2. FastPoll True QuestionsAnswer A for True and B for False • A wireless infrastructure networkuses a centralized broadcasting device, such as a wireless access point or router. • Wireless networks are less secure than wired networks. • WEP, WPA, and PSK are examples of Wi-Fi encryption protocols to protect against jacking. • Public key encryption uses a public key to encrypt messages, but a private key is required to decrypt messages. Chapter 5: LANs and WLANs

  3. Network Building Blocks • Network Classifications • LAN Standards • Network Devices • Clients, Servers, and Peers • Physical Topology • Network Links • Communications Protocols Chapter 5: LANs and WLANs

  4. Question • Networks come in many sizes and use many different technologies, yet they all need to communicate with each other. What is the key to network intercommunication? • A. Packet switching • B. Network protocols • C. Networktopology • D. Peer-to-peertechnology Chapter 5: LANs and WLANs

  5. Network Classifications • Personal Area Network (PAN) – interconnection of personal digital devices or consumer electronics • Local Area Network (LAN) – usually connects computers in a single building • Metropolitan Area Network (MAN) – public high-speed network with range of about 50 miles • Wide Area Network (WAN) – covers a large geographical area and typically consists of several smaller networks Chapter 5: LANs and WLANs

  6. LAN Standards • LAN technologies are standardized by the Institute of Electrical and Electronics Engineers (IEEE) Project 802 – Local Network Standards • IEEE 802.3 • ARCnet • Token Ring • FDDI • Ethernet Chapter 5: LANs and WLANs

  7. Network Devices • Each connection point on a network is referred to as a node • To connect to a LAN, a computer requires network circuitry, sometimes referred to as a network interface card (NIC) • A network peripheral contains network circuitry to directly connect to a network • A network device, or network appliance, is any electronic device that broadcasts network data, boosts signals, or routes data to its destination Chapter 5: LANs and WLANs

  8. Network Devices Chapter 5: LANs and WLANs

  9. Chapter 5: LANs and WLANs

  10. Chapter 5: LANs and WLANs

  11. Physical Topology • The arrangement of devices in network: physical topology • Star • Ring • Bus • Mesh • Tree • Similar networks can be connected by a bridge • Gateway-any device or software used to join two networks Chapter 5: LANs and WLANs

  12. CommunicationProtocol • Rules for transmitting data from 1 node to another: • Divide messages into packets • Affix addresses to packets • Initiate transmission • Regulate flow of data • Check for transmission errors • Acknowledge receipt of transmitted data Chapter 5: LANs and WLANs

  13. Communications Protocols • A packet is a “parcel” of data that is sent across a computer network Circuit-switchingtechnology vs. Packet switching technology Chapter 5: LANs and WLANs

  14. Circuit-switched networks require dedicated point-to-point connections during calls. Chapter 5: LANs and WLANs

  15. Packet-switched networks moves data packets based on the destination address in each packet. When received, packets are reassembled in the proper sequence to make up the message.

  16. Communications Protocols • Every packet over a network includes the address of its destination device • MAC address • a unique number given to a NIC when manufactured • IP address • a series of assigned numbers used to identify a network device • Assigned by ISP as permanent or temporarily by DHCP • Dynamic Host Configuration Protocols Chapter 5: LANs and WLANs

  17. Wired Networks • Wired Network Basics • Ethernet • Ethernet Equipment • Ethernet Setup Chapter 5: LANs and WLANs

  18. Question • You’re setting up a network in your home: • You want all 3 computers to access the cable modem for Internet access. • Which of the following will give access to the cable modem for your 3 computers • A. A router • B. A network interface card • C. A file server • D. A HomePlug Ethernet port Chapter 5: LANs and WLANs

  19. WiredNetworkBasics • Wired network • uses cables to connect network devices • are fast, secure, and simple to configure • Devices tethered to cables have low mobility Chapter 5: LANs and WLANs

  20. Ethernet • Simultaneously broadcasts data packets to all network devices • IEEE 802.3 • CSMA/CD protocol • Vary in speed from 10Mbps to 100Gbps Chapter 5: LANs and WLANs

  21. Ethernet Equipment Chapter 5: LANs and WLANs

  22. Ethernet Equipment • Ethernet adapter (designed to support the Ethernet protocols) • Network hub • Network switch • Network router • RJ45 connector Chapter 5: LANs and WLANs

  23. Ethernet Equipment • Ethernet adapter [NIC] • (designed to support the Ethernet protocols)

  24. Ethernet Equipment • Network router

  25. Ethernet Equipment • RJ45 connector

  26. Ethernet Setup

  27. Wireless Networks • Wireless Basics • Bluetooth • Wi-Fi • Wi-Fi Equipment • Wi-Fi Setup Chapter 5: LANs and WLANs

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