5 section a 1 network building blocks network classifications lan standards network devices ...
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5SECTION A
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Network Building BlocksNetwork Building Blocks Network Classifications LAN Standards Network Devices Clients, Servers, and Peers Physical Topology Network Links Communications Protocols
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Network Classifications
Personal Area Network (PAN) – interconnection of personal digital devices
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) – consists of several smaller networks
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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
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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
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5 Network Devices
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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
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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
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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
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5SECTION B
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Wired NetworksWired Networks Wired Network Basics HomePNA and Powerline Networks Ethernet Ethernet Equipment Ethernet Setup
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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
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HomePNA and Powerline Networks
HomePNA networks utilize existing telephone wiring or coaxial cables to connect network devices– Special NICs (Network Interface Card) and cables are
required A powerline network uses premises electrical wiring to form
the infrastructure for a LAN
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Ethernet Simultaneously broadcasts data packets to all network
devices– IEEE 802.3– CSMA/CD protocol
Vary in speed from 10Mbps to 100Gbps
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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.
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Ethernet Equipment Ethernet adapter (designed to support the Ethernet
protocols) Network hub Network switch Network router RJ45 connector
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Ethernet Setup
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Most routers are configured using a browser. You shouldchange the network administrator password, then verify that DHCP is enabled
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5SECTION C
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Wireless NetworksWireless Networks Wireless Basics Bluetooth Wi-Fi Wi-Fi Equipment Wi-Fi Setup
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Wireless Basics A wireless network transports data from one device to
another without cables or wires– RF signals
• Transceiver– Microwaves– Infrared light
Slower than wired networks Security concerns
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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
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Wi-Fi Wireless networking technologies that are compatible with
Ethernet MIMO technology uses two or more antennas to send
multiple sets of signals
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Wi-Fi Equipment
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Wi-Fi Equipment If your computer is not pre-equipped with wireless circuitry,
you can purchase and install a Wi-Fi adapter
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Wi-Fi Equipment Wireless network setups
– Wireless ad-hoc network– Wireless infrastructure network
• Wireless access point
• Wireless router
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Wi-Fi Setup Set up the router Connect to the router with a computer Configure the router Access the router setup utility Create a new router password
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Wi-Fi Setup Enter an SSID for the network Activate WEP, WPA, or PSK and create an encryption key Set up the wireless workstations Connect an Internet access device
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