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ITessentials:chap13
Flash cards for Chapter 13: Advanced Laptops and portable devices
| Question | Answer |
|---|---|
| What are the 5 wireless communication methods for laptops and portable devices? | Bluetooth, Infrared, Cellular WAN, Wi-Fi, and Satellite |
| What is the Maximum number of devices that can be connected to another device to create a personal area Network (PAN)? | Seven |
| What technical specification defines Bluetooth? | IEEE 802.15.1 |
| What frequency does bluetooth operate at? | 2.4-2.485 GHz |
| What is Adaptive Frequency hopping (AFH)? | allows signals to "hop" around using different frequencies within the Bluetooth range, thereby reducing the chance of interference when multiple Bluetooth devices are present |
| What security does bluetooth support? | 128-bit encryption and Personal identification number (PIN) authentication. |
| what are the limits for class 1 bluetooth technology? | Maximum Permitted Power: 100mW Approximate distance: 330ft. (100m) |
| What are the limits for class 2 bluetooth technology? | Maximum Permitted Power: 2.5mW Approximate Distance: 33ft. (10m) |
| What are the limits for class 3 bluetooth technology? | Maximum Permitted Power: 1mW Approximate Distance: 3ft. (1m) |
| How does Infrared Technology Transmit and receive data? | It transmits using LEDs and receives using photodiodes |
| what are the 4 types of IR Networks? | Line of sight, scatter, Reflective, and Broadband optical telepoint. |
| Line of sight IR | signal is transmitted only if there is a clear, unobstructed view between devices. |
| Scatter IR | The signal is bounced off ceilings and walls. |
| Reflective IR | The signal is sent to an optical transceiver and is redirected to the receiving device. |
| Broadband optical telepoint IR | The transmission can handle high-quality multimedia requirements. |
| What does Windows XP do when it detects a new IR device? | installs appropriate drivers. |
| What are three limitations of IR? | IR distances should be 3 feet IR cannot penetrate walls or ceilings. IR is suseptible to interference and dilution from strong light sources. |
| what is a limitation to Scatter IR? | transfer rates are lower and distances are shorter. |
| What are the 2 ranges for Cellular WAN? | Approximatly: 800MHz Approximatly: 1900MHz |
| Cellular Generation G1 | Analog:voice only Protocols: AMPS-not used |
| Cellular Generation G2 | Digital: Voice, conference calls, caller ID data speeds less than 20Kbps Protocols: GSM |
| Cellular Generation G2.5 | data speeds 30-90 Kbps, Web browsing, short audio/video clips, games, applications, and ringtone dowloads Protocols: GPRS and EDGE |
| Cellular Generation G3 | data speeds 144Kbps- 2Mbps, full-motion video, streaming audio, 3D gaming, faster browsing Protocols: EV-DO |
| Cellular Generation G3.5 | data speeds 384Kbps-14.4Mbps, supports high quality streaming Video and Video conferencing, supports VoIP Protocols: HSDPA |
| Global System for Mobile Communications (GSM) | Worldwide cellular network |
| General Packet Radio Service (GPRS) | Data service for users of GSM. |
| Enhanced Data Rates for GSM Evolution (EDGE) | Provides increased data rates and improved data reliability. |
| Evolution-Data Optimized (EV-DO) | Faster download rates. |
| High Speed Downlink Packet Access (HSDPA) | Provides enhanced G3 access speed. |
| Short Message Service (SMS) Multimedia Messaging Service (MMS) | SMS-Text messages MMS-Multimedia messages |
| Quad-band | Allows a cellular phone to operate on all four GSM frequencies: 850 MHz, 900 MHz, 1800 MHz, and 1900 MHz. |
| Wi-Fi is based on what networking standards? | 802.11 |
| What are the four Major 802.11 standards? | 802.11a 802.11b 802.11g 802.11n |
| Wi-Fi Standards are often reffered to by what? | their Last letters. |
| Which Wi-Fi standards use the 2.4GHz band? | 802.11b, 802.11g, and 802.11n |
| What is a disadvantage to the 2.4GHz band? | It's unregulated and heavily used. The large amount of traffic can cause wireless signals in the 2.4 GHz range to be interfered with by other 2.4 GHz wireless devices. |
| Which Wi-Fi standards use the 5GHz band? | 802.11a, and 802.11n |
| What Wi-Fi security standard uses 128-bit encryption? | WPA, WPA2 |
| Describe IEEE 802.11a | released in 1999, Maximum data rate: 54Mbps, Maximum range: 100ft (30.5m) |
| Describe IEEE 802.11b | released in 1999, Maximum data rate: 11Mbps, Maximum range: 100ft (30.5m) |
| Describe IEEE 802.11g | released in 2003, Maximum data rate: 54Mbps, Maximum range: 100ft (30.5m) |
| Describe IEEE 802.11n | released in 2009, Maximum data rate: 540Mbps, Maximum range: 165ft (50.3m) |
| When is a Satellite connection Network recommended and why? | when DSL or Cable connections are unavailable. because of the initial cost and relatively slower speeds. |
| With a Satellite connection, what other hardware is sometimes used? | Telephone line and modem are sometimes used for upload. |
| what are typical download speeds for Satellite uploads and downloads? | Upload: 50Kbps Download: 500Kbps |
| Name some advantages to connecting by satellite? | Two-way, high-speed Internet access, available in rural and remote areas, Quick file downloads, and Satellite dish can be used for TV access. |
| What is a disadvantage to Satellite? | obstructions and adverse weather can interfere with connection. |
| what hardware is needed for satellite installation? | 24-inch (610 mm) satellite dish Modem for uplink and downlink Coaxial cable and connectors |
| What do you call parts that can be repaired or replaced by the customer? | Customer Replaceable Units (CRUs) |
| Name some CRU components. | Battery, storage devices(unless warranty specifies technical support is required), and RAM |
| What do you call parts that should only be replaced by a technician? | Field replacable Units (FRUs) |
| Name some FRU components | Motherboard, Keyboard, and LCD display |
| What should you do before attempting to repair a laptop yourself? | check the warranty to see if repairs during the warranty period must be done at an authorized service center to avoid invalidating the warranty. |
| what are some obvious signs of battery failure? | The laptop shuts off immediately when AC power is removed. The battery is leaking. The battery overheats. The battery does not hold a charge |
| What should you do if you suspect battery failure? | replace the battery with a known good battery |
| What are some specifications that batteries must meet? | form factor, voltages, and power ratings |
| What do Port replicators and docking stations do? | They increase the number and type of ports available to connect to a laptop |
| Name 2 ways docking stations are connected to laptops | Docking station port, or USB. |
| how does an external IEEE 1394 harddrive connect to a computer? | Firewire |
| what are 3 types of SODIMM RAM? | 172 pin, 144 pin, and 200 pin. |
| What is the first thing you do before installing RAM? | Remove all sources of power. |
| What are some procedures for prevantative maintanence? | cleaning, hardware maintenance, and software updates. |
| What materials should you use on a laptop? | Non abrasive Compressed air Mild cleaning solution Cotton swabs Soft, lint-free cleaning cloth |
Created by:
alejo_flash
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