comptia a certification test questions

... Peripheral exchange; central route C) Distal data path; proximal data path D) External data bus; internal data bus Answer: D Diff: 2 Trang 517) 2 to the 20th power, or 1,048,576, is equal to a Trang ... data more accurately than earlier architectures 120) All the following statements about the PCI bus are true EXCEPT A) PCI-X data and PCIe data travel on separate connections B) PCI is a platform ... pump? A) Liquid and phase-change B) Thermal compound and thermal coupled C) Induction and rotary fan D) Auxiliary fan and thermal inductor Answer: A Diff: 2 Trang 729) Several processors have PGA

Ngày tải lên: 19/10/2017, 16:14

... limitation may not apply to you You should always use reasonable care, including backup and other appropriate precautions, when working with computers, networks, data, and files Syngress Media®, ... Developmental Editor: Gary Byrne Copy editor: diacriTech, Chennai, India Indexer: diacriTech, Chennai, India Cover Designer: Alisa Andreola For information on rights, translations, and bulk sales, ... Trang 2CompTIA Network+ Certification Study Guide Trang 3This page intentionally left blankTrang 4CompTIA Network+ Certification Study Guide Exam N10-004 2E Robert J Shimonski Technical Editor

Ngày tải lên: 04/07/2014, 13:20

... the areas of pro-gramming, hardware, database administration, graphic design, and network administration In 2007, he was awarded a police commendation for his work on developing a system to track ... of California Los Angeles (UCLA), Stanford Research Institute, University of California Santa Barbara, and University of Utah), it allowed researchers and government to exchange information and ... distribute data, share employee information, access shared data-bases, online programs, and other components that are needed or wanted by an organization The major difference between an intranet and the

Ngày tải lên: 04/07/2014, 13:20

... started the National Aeronautics and Space Administration (NASA), began launching space missions, and achieved the first manned landing on the moon in 1969 Using computers that employed only a ... DNS, a number like 207.46.250.222 can be translated to a friendly domain name such as microsoft.com In 1984, DNS became part of ARPANet, and would eventually play a major part resolving domain names ... on a high-speed storage area network (SAN) that can be configured as a high-speed back-bone between your systems, disks, and data With a RAID array, disk failure, is imminent but solvable As

Ngày tải lên: 04/07/2014, 13:20

... that are separated by a physical distance extending further than normal LAN media covers VPNs are available as software (such as Windows VPN, available on Windows 2003 and 2008) and hardware (firewalls ... (RAS) They can sim-ply dial into their local ISPs and create a virtual tunnel to the office A tunnel is created by wrapping (or encapsulating) a data packet inside another data packet and transmitting ... and wrapping and unwrapping the data is transparent to the end user Most commercially available firewalls come with a VPN module that can be set up to easily communicate with another VPN-capable

Ngày tải lên: 04/07/2014, 13:20

... these packets and display them in your friend’s e-mail program As you can see by this example, there are many different kinds of LANs and WANs that data may pass through LANs may be as small as a ... isn’t a defining factor WANs are often owned and managed by more than one organization Each LAN that is part of the WAN may be managed by individuals or IT departments, and either maintains their ... computer and the device Using a PAN allows you to do such things as update a calendar in a PDA, address book in a cell phone, and other tasks that are supported by the device CAN A CAN is a campus area

Ngày tải lên: 04/07/2014, 13:20

... of network you have LANs are small networks within a limited area of a few miles, MANs are within a metro-politan area, and WANs interconnect LANs over a wide area These char-acteristics define ... Offices are part of a LAN and a WAN? A Office A and B B Office B and C C Office C and D D The entire network (Office A, B, C, and D) An organization has offices in two countries Office A is a small ... lines A MAN is a group of LANs that are internetworked within a local ■ ■ geographic area, which the IEEE defines as being 50 km or less in diameter Trang 3ChApTEr 1: Network Fundamentals 38 ExAM

Ngày tải lên: 04/07/2014, 13:20

... signals to transmit data. Bandwidth Bandwidth is a measurement of the amount of data that can be passed over a cable in a given amount of time. If you compare cabling to a highway, and data to ... capacity varies depending on the media being used. Table 2.1 Bandwidth Capacity of Physical Media Media Standard Cable Type Bandwidth Capacity 10Base2 Coax 10 Mbps 10Base5 Coax 10 Mbps 10BaseT ... will carry the data at varying speeds and distances. Although some cables can carry the data for a hundred meters or so, others can span greater distances, connecting widely spaced areas. In

Ngày tải lên: 04/07/2014, 13:20

... troubleshoot hardware loopback Adapter A hardware loopback adapter is a way to test the ports on a system without having to connect to an external device For example, you can use a serial loopback adapter ... problem is Cable testers are tools that can analyze the capability of a cable to carry signals and can find breaks or other problems in the wire In addition to cable testers, there are also other ... suffers attenu-ation, you should also check cable distances If the maximum distance for cabling has been reached, then you may need to install a device that will regenerate the data and pass it along

Ngày tải lên: 04/07/2014, 13:20

... connec-tor or a cabling tray and transceiver called a media attachment unit (MAU) are connected to the cable Another cable called an attachment unit interface (AUI) that can be up to 50 m in length ... the safest method of keeping cables together, as staples or other methods can damage cable CABlE MANAGEMENT Cable management and termination of cabling runs becomes important when working as a Network ... to transmit data The optical fiber in the cable allows data to transmit faster and over greater distances, making it useful for connecting different locations at high speeds MEdIA STANdArdS As

Ngày tải lên: 04/07/2014, 13:20

... Terminating a coaxial cable Now that you have learned about coaxial cable and how to identify it, we will learn how to terminate a coaxial connector on to a RG type cable As with twisted-pair cable ... network adapter card’s internal transceiver 10Base2 refers to Ethernet LANs that use Thinnet cabling Thicknet coaxial cable can support data transfer over longer distances better than Thinnet can and ... standards that make it as a better candidate for new installations that will use Gigabit Ethernet It is designed for transmission speeds of up to 1 Gbps and has been made an official standard Category

Ngày tải lên: 04/07/2014, 13:21

... that data can travel along a cable in several ways, using a simplex, half-duplex, or full duplex data transfer When simplex is used, data moves in a single direction Half-duplex allows data to ... measurement of the amount of data that can be ■ ■ passed over a cable in a given amount of time Attenuation occurs when data transmitted over media weakens over ■ ■ distance Cable Testers and Troubleshooting ... coaxial cabling to transmit data at speeds of 10 Mbps ■ ■ across cable segments that are up to 185 m in length 10Base5 uses coaxial cabling to transmit data at speeds of 10 Mbps ■ ■ across cable

Ngày tải lên: 04/07/2014, 13:21

... bridge Bridges are intelligent devices and have the ability to forward packets of data based on MAC addresses A bridge can look at a packet of data and determine the source and destination involved ... devices mapped to the OSI layers at which they operate. Table 3.1 Mapping of Network Devices to the OSI Model oSI layer devices Application Gateway Presentation Gateway Session Gateway Transport Gateway ... Gateway Network Router, multilayer or Layer 3 switches, gateway Data Link NIC, bridge, Layer 2 switches, access point, gateway Physical Hub, MAU, repeater, gateway Trang 6Network Devices 101Hubs Although

Ngày tải lên: 04/07/2014, 13:21

... cable modem is similar to an analog modem in that it translates data into a form that can be transmitted, and retranslates it into data the computer can understand When data is sent using cable ... converts digital data to an analog wave, DSL transmits and receives data digitally across the phone line’s twisted-pair cable Because data isn’t converted, a higher bandwidth is available to transfer ... Advantages of IsDN ISDN offers several major advantages over conventional analog methods First, it has a speed advantage over normal dial-up lines The fastest analog modem connection currently available

Ngày tải lên: 04/07/2014, 13:21

... are network cards that have the same address, but each manufacturer is assigned a range by the various network standards organizations, and they use only that range Within the range, a manufacturer ... takes a signal from a digital medium and multiplexes it Although a CSU and a DSU can be sepa-rate components, they are generally packaged as a single unit The CSU is used to connect a terminal ... device to modulate and demodulate between digital and analog formats The CSU/DSU can be a separate component that attaches to a router and provides an interface between the routers, but many newer

Ngày tải lên: 04/07/2014, 13:21

... Firewall The application level firewall understands the data at the application level Application layer firewalls operate at the application, presentation, and session layers Data at the application ... further than a normal LAN VPNs are available in software (such as Windows network operating sys-tems) and hardware (firewalls such as Nokia/Checkpoint and SonicWALL) implementations Generally speaking, ... Service (RAS) servers They can simply dial into their local ISPs and create a virtual tunnel to the office A tunnel is created by wrapping (or encapsulating) a data packet inside another data packet

Ngày tải lên: 04/07/2014, 13:21

... that loops will result and flood the network vlAN A VLAN is a virtual LAN that allows messages to be broadcast to all of the network devices that are in the same broadcast domain A broadcast ... to transmit data between machines Content switches will also take advantage of caching and load balancing so that the amount of data trans-mitted across networks and requests processed by a server ... and load balancing so ■ ■ that the amount of data transmitted across networks and requests processed by a server are reduced Advanced Features of a Switch A VLAN allows messages to be broadcast

Ngày tải lên: 04/07/2014, 13:21

... that supports a longer distance B Install a passive hub to increase the distance that data can travel along the cable C Install a NIC to increase the distance that data can travel along the cable ... we take a look at a senior manager who is attending a status meeting in a conference room where a limited number of data ports will be available to access e-mail, databases, and other information ... impacting the day-to-day use of the facilities In addition, the APs could be located in an area of the library that has restricted access and is physically secure from daily activities Roaming A

Ngày tải lên: 04/07/2014, 13:21

... data is divided and simultaneously transmitted on as many frequencies as possible within a particular frequency band (the channel) DSSS adds redundant bits of data known as chips to the data ... buildings, and the curvature of the earth to name a few Assuming that the surface being impacted is relatively flat and smooth, a large majority of the original signal will be reflected off at a different ... larger problem refraction could present Absorption and Scattering As disruptive as reflection and refraction are, absorption and scattering can absolutely destroy an electromagnetic signal wave

Ngày tải lên: 04/07/2014, 13:21

... digital assistants) and almost all portable computers do or can have infrared capabilities Infrared devices typically can achieve a maximum data throughput of 4 Mbps, but as it is a light-based ... rather is the focus of the Infrared Data Association (IrDA) The IrDA was founded in 1993 as a member-funded organization whose primary function is to create and promote a standardized data transmission ... mechanism using infrared light Infrared data transmission has been used for many applications in a non-nonstandard manner by Hewlett Packard calculators and printers Now, most PDAs (personal digital

Ngày tải lên: 04/07/2014, 13:21