best comptia a study guide 2013

... K Vascular Imaging 10 p Angiography p Aorta ultrasound p Arterial ultrasound p Captopril renal scan (CRS) p Carotid ultrasonography p Computed tomographic angiography (CTA) p Magnetic resonance ... B Breast Imaging p Mammogram p Breast ultrasound p Magnetic resonance imaging of breast p C Cardiac Imaging p Stress echocardiography p Cardiovascular radionuclide imaging (thallium, sestamibi, ... small lesions, and diagnosing inflammatory bowel disease • Cost: $$ Barium Swallow (Esophagram) Indications • • • • • Achalasia Esophageal neoplasm (primary or metastatic) Esophageal diverticuli

Ngày tải lên: 21/01/2020, 11:14

... LowhemoglobinA2 Lead poisoning or sideroblasticanemia thalassemiatrait/disease Beta-thalassemiatrait/disease Trang 26Diagnostic Imaging Best Test(s) • Ultrasound of abdominal aorta is best initial screening ... present with associated hypokalemia, evaluate for aldosteronism Diagnostic Algorithm 10 Adrenal Mass Suspectedadrenal mass MRI or CT of adrenalgland Cysticappearance Homogeneousappearance Nonhomogeneous ... more accurate test Ancillary Tests • CT of abdominal aorta with IV contrast for preoperative imaging and size estimation and to diagnose perforation/tear • Angiography for detailed arterial anatomy

Ngày tải lên: 21/01/2020, 22:49

... 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

... 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 ... 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 ... 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

... 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

... is an example of initiating activity not facilitating trade Also, a failed range extension is often an early indication that themarket wants to go in that direction Trang 19Chicago Board of Trade ... pattern a constant? A Yes, the behavior pattern is a constant but the length of time any part of the pattern lasts depends on a variable. Q What is the variable? A The perception of value. Trang ... directions-range exten-sion up and down-because market participants are uncertain A failed range extension shows that the market tried to extend the range past the initial balance-at either end-and failed

Ngày tải lên: 02/07/2014, 06:20

... sharply away from current value and then to move back to it. The reason: the event doesn't usually have a fundamental impact on value right away The event is obvious So market participants react ... result in a sharp move I want to emphasize again, however, that the dynamics in each case are different. After a surprise, price generally moves back to value in the near-term because there hasn't ... Trang 1C B 0 T®MARKET PART III 0 ChicagoBoardofTrade InternetAddresshttp://www.cbot.corn Trang 2Care has been taken in the preparation of this material, but there is no warranty or representation

Ngày tải lên: 02/07/2014, 06:20

... substantial speedup by doubling its RAM. B. The swap space may be safely eliminated. C. The administrator should use the swapon command to activate more use of the existing swap space. D. Available ... computers—which are actu- ally far more powerful than the mainframes of just a few years ago. Because of its mainframe heritage, Unix (and hence also Linux) scales well to perform today’s demanding ... Chapter 4 for more information. 8. B. In 2001, all major Debian-based distributions use not just the Debian package system but many Debian component packages as a starting base. Debian is available...

Ngày tải lên: 16/08/2013, 16:24

... reading the book. The answers to this test appear on a separate page after the last question. Each answer also includes an explanation and a note telling you in which chapter this material appears. In ... this training material and specifically disclaims any warranties of merchantability or fitness for a particular purpose. CompTIA makes no guarantee concerning the success of persons using any such ... workgroups. A workgroup is a collection of individuals (a sales department, for example) who share the same files and databases over the LAN. Figure 1.1 shows an example of a small LAN and its...

Ngày tải lên: 10/12/2013, 16:15

... financial and publicity-related implications of an effective DoS attack are hard to measure—at best they are embarrassing, and at worst they are a deathblow. Companies reliant on Internet traffic and ... Instant Messaging (IM), Oracle, and almost any other password that is trans- mitted in the clear. Another tool, mailsnarf, will grab any and all e-mail messages it sees, and store them in a standard ... Accounts and create a new account. In the appropriate screens, enter e-mail sam.carter@sgc.com, name Sam Carter, mail.destinationdomain.com as the mail server, and anything in the username/password...

Ngày tải lên: 25/03/2014, 11:10

... 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

... 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

... ThinkPad series of laptops? A. Touchpad B. Touchball C. Touchpoint D. Touchway 5. Which laptop accessory allows you to power your laptop from a car or airplane? A. AC adapter B. DC adapter C. Battery ... 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