a plus certification study guide free pdf

... take advantage of caching 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 ... 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 ... for. Broadcast messages are the messages that are sent out to all of the  nodes in a broadcast domain. A broadcast domain is a logical divi- sion of computers that can communicate with one another

Ngày tải lên: 04/07/2014, 13:21

... 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

... corporate networks that do wish to adopt IPv6 sooner rather than later and may make migration more attractive for others as well. The 6to4 Protocol is installed on a router that serves as a gate- ... physical MAC addresses. ARP discovers this information by way of broadcasts, and keeps a table of IP-to-MAC entries. Test Day Tip Remember that routers, whether they are dedicated hardware devices ... send data from your computer to your company’s national headquarters in New York over a packet-switched network, each individual packet, or chunk of data, can take a different physical route

Ngày tải lên: 04/07/2014, 13:21

... HTTP allows Exam Warning SNMP management software is not currently included with the Windows operating system and has to be purchased and installed separately. Exam Day Tip Because it usually ... 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 between ... the last time you were able to do so? To make a diagnosis or analysis of the information, you must organize it in a logical manner. This means learning to sift through and discard irrelevant

Ngày tải lên: 04/07/2014, 13:21

... 802.1 0a SILS Part A: The Model 802.10b SILS Part B: Secure Data Exchange. Standard on protocol for secure data exchange at Data Link Layer 802.10c SILS Part C: Key Management. Standard on the management ... cell area to another without changing frequency, unless for some reason the cells operate on the same frequency and have no overlap of coverage area. Exam Warning IEEE standards are an important ... locations in a MAN 802.6m Subnetwork of MAN 802.7 Recommended Practices for Broadband LAN. Provides recommendations for the physical, electrical, and mechanical practices of broadband coaxial

Ngày tải lên: 04/07/2014, 13:21

... increase the distance that data can travel along the cable. D. Install a switch to increase the distance that data can travel along the cable. Correct answer and explanation: D. Install a switch ... virtual LAN and used so that broadcast messages can be sent to all computers and devices that are part of the same VLAN because they are part of the same broadcast domain. D is incorrect because ... Incorrect answers and explanations: A, B, and C. Answer A is incorrect because fault tolerant routes are a main advantage of routers if one route is unavailable. Answer B is incorrect for the same

Ngày tải lên: 04/07/2014, 13:21

... wireless access point. Correct answers and explanations: A and C. Answer A is correct, because enabling MAC address filtering will only allow machines that have had their MAC addresses added to authorized ... (AIEE), 639 Analog modems, 108–109 Analog signaling vs. digital signaling, 240–242 API. See Application program interface APIPA. See Automatic private IP addressing Apple II computer, 11 Application ... Network ArpWatch, 214 Asymmetric digital subscriber line (ADSL), 369 Attachment unit interface (AUI), 72 Attack signature database, 389 Attenuation, 52, 89 Auditing, 433–434 AUI. See Attachment

Ngày tải lên: 04/07/2014, 13:21

... organization must adhere to will help you manage how your network operates. Incorrect answers and explanations: A, B, C. Health Insurance Portability and Accountability Act (HIPAA), Sarbanes-Oxley ... management documentation. Incorrect answers and explanations: B, C, and D. Load balancing, cache engines, technical network diagrams, and building schematics are not part of configuration management ... working at the local county hospital, which of the following regulations should your organization need to be aware of? A.  Health Insurance Portability and Accountability Act (HIPAA) B. Sarbanes-Oxley

Ngày tải lên: 04/07/2014, 13:21

... … As you can see in the result, the space used by each schema in each tablespace is shown as well as the total space used in each tablespace and the total space used by each schema. The total ... BY , and HAVING clauses. They cannot be used in WHERE clauses. Know how MIN and MAX sort date and character data. Older dates evaluate to lower values, while newer dates evaluate to higher values. ... out the space allocated by tablespace, the space allocated by schema, and the space allocated by tablespace and schema. These were written using three dif- ferent SQL statements. You can see the

Ngày tải lên: 15/12/2013, 05:15

... N Creating an Oracle 11g Database FIGURE 9.35 A comparison of data dictionary views USER_TABLES All tables owned by a particular database user. DBA_TABLES All tables in the entire database. Reserved ... create your Oracle Database. As the DBA, you can manage these database-definition tem- plates. Saving a definition of your database in a template format makes it easier to perform various tasks. ... (Structure As Well As Data) Creates a new template based on the structural character- istics of an existing database. The data files and all corre- sponding user data are included in the new database.

Ngày tải lên: 24/12/2013, 13:16

... initialization parameter UNDO_MANAGEMENT=AUTO (default), and include an UNDO TABLESPACE clause in your CREATE DATABASE statement, like this: CREATE DATABASE “TEST1” DATAFILE ‘/u01/app/oracle/oradata/TEST1/system01.dbf’ ... shows the optional clauses you can use while creating a locally managed tablespace: CREATE TABLESPACE APPL_DATA DATAFILE ‘/disk3/oradata/DB01/appl_data01.dbf’ SIZE 100M DEFAULT STORAGE COMPRESS ... optional clauses you can use while creating a dictionary- managed tablespace: CREATE TABLESPACE APPL_DATA DATAFILE ‘/disk3/oradata/DB01/appl_data01.dbf’ SIZE 100M DEFAULT STORAGE ( INITIAL 256K

Ngày tải lên: 24/12/2013, 13:16

... database, the database verifies that the username is a valid database account and that the password supplied matches that user’s password as stored in the database Password-authenticated ... When an externally identified user attempts to connect to the database, the database verifies that the username is a valid database account and trusts... the name of the database you want ... the same as the ORACLE_SID because a database can have multiple service names. In Oracle 11g, the service name is normally the same as the global database name. This is the service name that is

Ngày tải lên: 24/12/2013, 13:16

... privileges Zachary Mary grants to Zachary. GRANT SELECT ANY TABLE WITH ADMIN OPTION Rex Zachary grants to Rex. GRANT SELECT ANY TABLE Rex Zachary is dropped and Rex retains privileges. GRANT SELECT ANY ... creates several roles in the database based on the options you chose at the database creation. The following are few of the important roles that are created automatically during database creation: ... database implicitly performs these calls for you. You can explicitly make these database calls from Java, PL/SQL, or Oracle Call Interface (OCI) programs. A logical read is a measure of the amount

Ngày tải lên: 24/12/2013, 13:16

... either an integer numeric or string value.Thus, for example, an array could contain a floating-point value, a string, a Boolean, and even another array. Although PHP will automatically provide a key ... keys n Creating and handling multidimensional arrays n Sorting arrays n Randomizing arrays n Intersecting arrays n Calculating the difference between one or more arrays n Serializing arrays Creating Arrays The ... In addition, $_REQUEST is a method-agnostic array that you can use to access form data (basically a merge of both $_GET and $_POST). Superglobal arrays are available in every scope, which makes...

Ngày tải lên: 26/01/2014, 11:20

... electrical charge? A: Capacitor 419. A parity error usually means a problem with? A: Memory (RAM) 21 A: Perform a full backup 254. What is the cheapest way to access the Internet? A: Dial Up access 255. ... of RAM and what? A: A swap file 445. Memory that is paged out to the hard drive is known as what? A: virtual memory Congratulations!! You have purchased one of the Troy Technologies USA Study ... AUTOEXEC.BAT? A: DOSKEY 40. Which allows faster access; RAM, ROM, or virtual memory? A: RAM 41. What batch file command will stop a batch file operation until a key is pressed? A: PAUSE 42. What...

Ngày tải lên: 11/12/2013, 14:15

... two) A: Assure that you and the PC are at the same electrical charge level Use anti-static spray liberally 2 Memory Random Access Memory (RAM) - The working area of your PC where programs are ... colors PGA (Professional Graphics Adapter) First video card capable of 3-D displays VGA (Video Graphics Adapter) Replaced PGA and provide 640x480 @ 16 colors SVGA (Super VGA) Same as VGA but provides ... statements is true? A: Each PC can access any other PCs data. 128: Which bus has up to a 16bit path? A: ISA 129: What sort of chip has 168 pins? A: DIMM 36 283: How many bytes are stored in a...

Ngày tải lên: 10/12/2013, 15:15

... market's natural organization are the AtTheMarket'sNatural most relevant reference points a trader can have. Only two things Parameters can happen when the market reaches these areas: ... rotations create a much weaker parameter-one that can be violated more easily than a parameter formed by a directional move. As the rotations become narrower, it shows that the longer- term trader ... 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...

Ngày tải lên: 02/07/2014, 06:20