1. Networks LANS,

2. 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. 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 WLANs2

3. 3 Network Building Blocks Network Classifications LAN Standards Network Devices Clients, Servers, and Peers Physical Topology Network Links Communications Protocols

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. Network topology – D. Peer-to-peer technology Chapter 5: LANs and WLANs4

5. 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

6. Chapter 5: LANs and WLANs6 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

7. Chapter 5: LANs and WLANs7 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

8. Network Devices Chapter 5: LANs and WLANs8

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11. 5 Chapter 5: LANs and WLANs11 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

13. Chapter 5: LANs and WLANs13 Communication Protocol 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

14. Chapter 5: LANs and WLANs14 Communications Protocols A packet is a “parcel” of data that is sent across a computer network Circuit-switching technology vs. Packet switching technology

15. Chapter 5: LANs and WLANs15 Circuit-switched networks require dedicated point-to-point connections during calls.

16. 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.

17. Chapter 5: LANs and WLANs17 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 ProtocolsDynamic Host Configuration Protocols

18. Chapter 5: LANs and WLANs18 Wired Networks Wired Network Basics Ethernet Ethernet Equipment Ethernet Setup

19. 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 WLANs19

20. Chapter 5: LANs and WLANs20 Wired Network Basics Wired network – uses cables to connect network devices – are fast, secure, and simple to configure – Devices tethered to cables have low mobility

21. Chapter 5: LANs and WLANs21 Ethernet Simultaneously broadcasts data packets to all network devices – IEEE 802.3 – CSMA/CD protocol Vary in speed from 10Mbps to 100Gbps

22. Ethernet Equipment Chapter 5: LANs and WLANs22

23. Chapter 5: LANs and WLANs23 Ethernet Equipment Ethernet adapter (designed to support the Ethernet protocols) Network hub Network switch Network router RJ45 connector

24. Ethernet Equipment Ethernet adapter [NIC] – (designed to support the Ethernet protocols)

25. Ethernet Equipment Network router

26. Ethernet Equipment RJ45 connector

27. Ethernet Setup

28. Chapter 5: LANs and WLANs28 Wireless Networks Wireless Basics Bluetooth Wi-Fi Wi-Fi Equipment Wi-Fi Setup