comptia a complete study guide pdf download

... can do to counter the threat Fortunately, these attacks require fairly sophisticated software and are harder to engineer than a DoS attack, such as a TCP SYN attack UDP Attacks A UDP attack attacks ... system and session com-A man-in-the-middle attack is an active attack Something is actively cepting the data and may or may not be altering it If it’s altering the data, the altered data masquerades ... have stan-a price thstan-at stan-anyone in the mstan-arket would pstan-ay, but cstan-an the sstan-ame be sstan-aid for the other stan-trators in your company? adminis-Social engineering can have

Ngày tải lên: 14/08/2014, 20:20

... threat Fortunately, these attacks require fairly sophisticated software and are harder to engineer than a DoS attack, such as a TCP SYN attack UDP Attacks A UDP attack attacks either a maintenance ... have stan-a price thstan-at stan-anyone in the mstan-arket would pstan-ay, but cstan-an the sstan-ame be sstan-aid for the other stan-trators in your company? adminis-Social engineering can have ... and the applications you use are up-to-date. Trang 25of attack can also be undetectable An attacker can use an invalid IP address, and TCP won’t care, because TCP will respond to any valid request

Ngày tải lên: 10/08/2014, 12:21

... SuperXGA (SXGA) has a resolution of 128 0 × 1 024 and an aspect ratio of 5:4, then WSXGA might have a resolution of 1440 × 900 and a 16:10 aspect ratio Each of these advanced resolutions has a standard ... an effective fre- quency of 800MHz and a transfer rate of 800Mbps per data pin are created. PC800 uses only a 16-bit (2-byte) bus called a channel, exchanging a 2-byte packet during each read/write ... overheating. RIMM Not an acronym, RIMM is a trademark of Rambus Inc., perhaps a clever play on the acronym DIMM, a competing form factor. A RIMM is a custom memory module that varies in physical

Ngày tải lên: 14/08/2014, 20:20

... laptops are space-chal-lenged Another primary concern is heat Restricted space means less airflow, meaning parts can heat up and overheat faster To overcome space limitations, laptop parts are ... include Quad eXtended Graphics Array (QXGA) and its derivatives, which have four times as many pixels as XGA, and Hex eXtended Graphics Array (HXGA) and its derivatives, which has 16 times as many ... can be used to add an input device like a mouse or a standard-size keyboard.Trackball Many early laptops used trackballs as pointing devices A trackball is essentially the same as a mouse turned

Ngày tải lên: 14/08/2014, 20:20

... you’re searching, you can also use wildcards Wildcards are characters that act as placeholders for a character or set of characters, allowing, for instance, a search for all files with a text ... such a search, you’d type an asterisk (*) as a stand-in for the filename: *.TXT An aster-isk takes the place of any number of characters in a search A question mark (?) takes the place of a single ... right-click a partition in either area, you can perform a variety of functions, such as formatting the partition and changing the name and drive-letter assignment For additional options and information,

Ngày tải lên: 14/08/2014, 20:20

... the machine, you can select the appropriate adapter to see graphical usage data for that adapter. Users (Windows XP Only) The Users tab, which is available if you have more than one user account ... display of CPU usage history, page-file usage in MB, and a graphical display of page-file usage. This tab also provides you with additional memory-related information such as physical and kernel ... 2000, the Task Manager has three tabs: Applications, Processes, and Perfor- mance. In Windows XP, the Task Manager can have two additional tabs: Networking and Users. Let’s look at these tabs in

Ngày tải lên: 14/08/2014, 20:20

... physical)  Star (physical only)  Ring (can be both logical and physical)  Mesh (can be both logical and physical)  Hybrid (usually physical) Each topology has advantages and disadvantages. At the ... addresses They are taken as a complete address and used as destination addresses only, just like broadcast addresses... for host identification The 2 high-order bits are always binary 10, and ... computer that is hosting it than a nondedicated server might require. This savings in overhead may translate to a certain efficiency and can thus be considered as having a beneficial impact on

Ngày tải lên: 14/08/2014, 20:20

... the hardware and software Updates and patches are often available for download, or the websites may offer knowledge bases of troubleshooting information and downloadable manuals as well as live ... Identifying Safety and Environmental Issues Identifying Potential Safety Hazards Anything can be a potential safety hazard, right? Okay, maybe that statement is a bit too paranoid, but there are many ... occur and the device is unavailable Certain DMA channels are assigned to standard AT devices DMA is no longer as popular as it once was, because of advances in hardware technology, but it is

Ngày tải lên: 14/08/2014, 20:20

... and are still popular today Also readily available are infrared keyboards and printers Perhaps some of the most useful infrared devices are keyboards for PDAs They’re smaller than standard laptop ... infrared-enabled device at another and transmit Infrared Technical Specifications Current IrDA specifications allow transmission of data up to 16Mbps, and IrDA claims that 100Mbps and 500Mbps standards ... operating parameters of CPU and system fans 20. What is the name of the utility that allows you to check hardware resources and alter them, if allowed? A. Device Manager B. Task Manager C. Program

Ngày tải lên: 14/08/2014, 20:20

... backups After you make a backup, ensure that you can read from it If you’ve just backed up a small amount of data, restore it to an alternate location and make sure you can read it If you are ... obtaining quality images from handheld scanners, flatbed scanners are the far more popular option today Flatbed (or desktop) scanners have a glass plane, also called the scanner window Images are ... first partition created on a hard drive 4. D A logical partition is any partition that has a drive letter It can be primary, active, or extended However, a logical partition can also span multiple

Ngày tải lên: 14/08/2014, 20:20

... have a natural curiosity about our bodies, and a study of anatomy and physiology elaborates on this interest Anatomists have developed a univer­ sally acceptable set of reference terms that allows ... the original, but also features alterations, customization and adaptation from the north American version Trang 2AnAtomy & Physiology Coloring WorkbookA Complete Study Guide Trang 3Director ... 3 Calf Brachial Femoral Popliteal 4 Epigastric Hypogastric Right iliac Left upper quadrant 5 Orbital cavity Nasal cavity Ventral cavity Oral cavity There are three essential

Ngày tải lên: 21/01/2020, 15:21

... that use the same frequency within a  small space can easily cause network disruptions and even denial of service (DoS) for valid network users. If an attacker hijacks the AP and does not pass ... and purchase new hardware, check to see if you can update the firmware of your AP. The AP vendor may have released a more recent firmware version that supports the disabling of SSID broad- casts. ... contains a high percentage of well-known and predictable information, making it vulnerable to plaintext attacks. How can I prevent unauthorized users from authenticating and as-Q: sociating

Ngày tải lên: 04/07/2014, 13:21

... space available to them, network engineers, manag- ers, administrators, and technicians would have a lackadaisical attitude when assigning IP space. Quite the contrary (as was learned earlier ... their addressing to the APIPA range. Think about this chapter and what you have learned so far and how it all ties together. All nodes on a subnet have to be in the same IP address range to ... application layer gate- way such as a proxy server, or it must have its address translated into a legal, public address. A process called NAT performs this translation before sending data out to

Ngày tải lên: 04/07/2014, 13:21

... Group Management Protocol (IGMP) IGMP allows computers on a network such as the Internet to participate in IP multicasting A multicast address allows an application to send a message to a large ... really detail-minded (or paranoid), you could even ask that he call you back when it gets there, and let you know that all the pages are there in sequence and it wasn’t damaged along the way ... header Two additional TCP/IP protocols that operate at the network layer are the ARP and the Reverse Address Resolution Protocol (RARP) ARP’s job is to translate logical IP addresses to physical

Ngày tải lên: 04/07/2014, 13:21

... pairs of end-points What is a gateway, and why would I need one? Q: The word A: gateway has many different meanings in the Information Technology (IT) world A protocol-translating gateway translates ... link layer The data link layer is responsible for taking the information it gets ■ ■ from the physical layer and organizing it into frames The devices that operate at the data link layer are switches ... Windows operating system and has to be purchased and installed separately. Exam day Tip Because it usually sends usernames and passwords in clear-text the use of Telnet has been almost entirely

Ngày tải lên: 04/07/2014, 13:21

... bidirectional parallel port has one important advantage over a standard parallel port: It can both transmit and receive data. These parallel ports are capable of interfac- ing with such devices as external ... and Characteristics of Adapter Cards An adapter card (also known as an expansion card) is simply a circuit board you install into a computer to increase the capabilities of that computer. Adapter ... multithreading (SMT). SMT takes advantage of a modern CPU’s super- scalar architecture. Superscalar processors are able to have multiple instructions operating on separate data in parallel. HTT-capable...

Ngày tải lên: 10/08/2014, 12:21

... aspects and importance of safety and environmental issues Identify potential safety hazards and take preventative action Use Material Safety Data Sheets (MSDS) or equivalent documentation and ... upgrade and optimize hardware, software and data security for example:  BIOS  Smart cards  Authentication technologies  Malicious software protection  Data access (basic local security ... you’ll find sample exams for each of the A+ exams. Take these practice exams just as if you were actually taking the A+ exams (without any reference material). Depending on what edition of...

Ngày tải lên: 10/08/2014, 12:20

... commonsense approach: They designed their handhelds to use standard AA batteries. Most notebook computers can also use AC power with a special adapter (called an AC adapter) that converts AC power into ... examining some preventative maintenance recommen- dations and issues. Exam Essentials Know how many pins an IDE/PATA/ATA-5/ATA-6 cable has. A cable for use with these technologies has 40 pins. You’re ... Another primary concern is heat. Restricted space means less airflow, meaning parts can heat up and overheat faster. To overcome space limitations, laptop parts are physically much smaller and lighter,...

Ngày tải lên: 10/08/2014, 12:21

... the administrator. 3. If updates are available, they are downloaded automatically in the background. 4. Once the updates are downloaded, Windows Update notifies you that the download is complete ... you make a backup, ensure that you can read from it. If you’ve just backed up a small amount of data, restore it to an alternate location and make sure you can read it. If you are backing up ... HAL, or the Hardware Abstraction Layer, is the translator between the hardware and the operating system. 20. B. Task Manager will show you a list of running processes and applications and allow...

Ngày tải lên: 10/08/2014, 12:21

... and wide area. Local wireless is usually available within a particular room or building only. Once you leave that area, it is no longer available. Local wireless has an operating range of around ... through a layer, the layer tacks its information TABLE 8.1 Topologies—Advantages and Disadvantages Topology Advantages Disadvantages Bus Cheap. Easy to install. Difficult to reconfigure. Break in ... data, and controls the flow of data. It can also receive and translate data into bytes for the CPU to understand. It communicates at the Physical layer of the OSI model and comes in many shapes...

Ngày tải lên: 10/08/2014, 12:21