LANs and WLANs ppt

LANs and WLANs LANs and WLANs Chapter 5 Chapter 5 5 Chapter 5: LANs and WLANs 2 Chapter Contents  Section A: Network Building Blocks  Section B: Wired Networks  Section C: Wireless Networks  Section D: Using LANs  Section E: Security Through Encryption 5 Chapter 5: LANs and WLANs 3 Network Classifications  Personal Area Network (PAN) – interconnection of personal digital devices  Neighborhood Area Network (NAN) – connectivity spread over several buildings  Local Area Network (LAN) – usually connects computers in a single building – this is the one most people have heard of  Metropolitan Area Network (MAN) – public high- speed network with range of about 50 miles  Wide Area Network (WAN) – consists of several smaller networks 5 Chapter 5: LANs and WLANs 4 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 networked peripheral, or network-enabled peripheral, is any device that 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 5 Chapter 5: LANs and WLANs 5 Network Devices 5 Chapter 5: LANs and WLANs 6 Clients, Servers, and Peers  Network devices can function as clients or as servers – Application server – File server – Print server  Networks that include one or more servers can operate in client/server mode 5 Chapter 5: LANs and WLANs 7 Physical Topology  The arrangement of devices in a network is referred to as its physical topology – Star – Ring – Bus – Mesh – Tree  Two similar networks can be connected by a device called a bridge  Gateway is a generic term for any device or software code used to join two networks 5 Chapter 5: LANs and WLANs 8 Network Links  A communications channel, or link, is a physical path or frequency for signal transmissions  Bandwidth is the transmission capacity of a communications channel – Broadband – Narrowband 5 Chapter 5: LANs and WLANs 9 Communications Protocols  Rules for efficiently transmitting data from one network 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 5 Chapter 5: LANs and WLANs 10 Communications Protocols  A packet is a “parcel” of data that is sent across a computer network – Circuit-switching technology vs. packet switching technology • Voice over IP (VoIP) [...]... router RJ45 connector Chapter 5: LANs and WLANs 17 5 Ethernet Setup Chapter 5: LANs and WLANs 18 5 Ethernet Setup Chapter 5: LANs and WLANs 19 5 Ethernet Setup The Network Connection window helps you check your connection Chapter 5: LANs and WLANs 20 5 SECTION Wireless Networks C Wireless Basics Bluetooth Wi-Fi Wi-Fi Equipment Wi-Fi Setup Chapter 5: LANs and WLANs 21 5 Wireless Basics A wireless... 5: LANs and WLANs 28 5 Wi-Fi Setup Enter an SSID for the network Activate WEP, WPA, or WPA2 and create an encryption key Set up the wireless workstations Connect an Internet access device Chapter 5: LANs and WLANs 29 5 Wi-Fi Setup Chapter 5: LANs and WLANs 30 5 SECTION Using LANs D LAN Advantages and Challenges Sharing Files Sharing Printers LAN Parties Troubleshooting Chapter 5: LANs and WLANs. .. Chapter 5: LANs and WLANs 24 5 Wi-Fi Equipment Chapter 5: LANs and WLANs 25 5 Wi-Fi Equipment If your computer is not pre-equipped with wireless circuitry, you can purchase and install a Wi-Fi card Chapter 5: LANs and WLANs 26 5 Wi-Fi Equipment Wireless network setups – Wireless ad-hoc network – Wireless infrastructure network • Wireless access point • Wireless router Chapter 5: LANs and WLANs 27 5 Wi-Fi... Chapter 5: LANs and WLANs 11 5 SECTION Wired Networks B Wired Network Basics HomePNA and Powerline Networks Ethernet Ethernet Equipment Ethernet Setup Chapter 5: LANs and WLANs 12 5 Wired Network Basics A wired network uses cables to connect network devices Wired networks are fast, secure, and simple to configure Devices tethered to cables have limited mobility Chapter 5: LANs and WLANs 13 5... Vary in speed from 10Mbps to 10Gbps Chapter 5: LANs and WLANs 14 5 Ethernet On an Ethernet, data travels on a first come, first served basis If two workstations attempt to send data at the same time, a collision occurs That data must be resent Chapter 5: LANs and WLANs 15 5 Ethernet Equipment Checking a workstation for an Ethernet port Chapter 5: LANs and WLANs 16 5 Ethernet Equipment Ethernet adapter... unauthorized access – More vulnerable than standalone computers Wireless networks can be tapped from a “snooping” computer Networked computers are susceptible to an increasing number of worms, Trojan horses, and blended threats Chapter 5: LANs and WLANs 33 5 Wi-Fi Setup Change the default password for your router when you install a wireless network Chapter 5: LANs and WLANs 34 5 Sharing Files  If you use... 5: LANs and WLANs 22 5 Bluetooth Bluetooth is a short-range, wireless network technology designed to make its own connections between electronic devices, without wires, cables or any direct action from a user Chapter 5: LANs and WLANs 23 5 Wi-Fi Wireless networking technologies that are compatible with Ethernet MIMO technology uses two or more antennae to send multiple sets of signals Chapter 5: LANs. .. and WLANs 31 5 LAN Advantages and Challenges LANs enable people to work together Sharing networked software can reduce costs Sharing data on a LAN can increase productivity Sharing networked hardware can reduce costs Sharing networked hardware can provide access to a wide range of services and specialized peripheral devices Chapter 5: LANs and WLANs 32 5 LAN Advantages and Challenges  Resources... automatically detects available LANs any time you turn on a workstation  To connect to a shared resource, you might be asked for a user ID and password Chapter 5: LANs and WLANs 35 5 Sharing Files In this drive mapping example, a server’s drive C is mapped as drive F by a workstation After the mapping is complete, the server’s hard disk appears in the workstation’s directory as drive F and can be used just as... After the mapping is complete, the server’s hard disk appears in the workstation’s directory as drive F and can be used just as though it were a drive connected directly to the workstation Chapter 5: LANs and WLANs 36 . LANs and WLANs LANs and WLANs Chapter 5 Chapter 5 5 Chapter 5: LANs and WLANs 2 Chapter Contents  Section A: Network. router  RJ45 connector 5 Chapter 5: LANs and WLANs 18 Ethernet Setup 5 Chapter 5: LANs and WLANs 19 Ethernet Setup 5 Chapter 5: LANs and WLANs 20 Ethernet Setup  The