linux administration a beginner guide 6 e network pro library pdf

... released is free, and that no one can ever take away these freedoms It is acceptable to take the software and resell it, even for a profit; however, in this resale, the seller must release the ... All trademarks are trademarks of their respective owners Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the ... 2000, and Windows NET Server are all capable of providing services such as databases over the network Users of this arrangement can be called network users, since they are never actually logged...

Ngày tải lên: 24/04/2014, 09:18

... barney and fred, but not from the system called pebbles The parentheses were added to make the command more readable However, each of the tcpdump arithmetical and Boolean operators has precedence ... of addresses To capture broadcast packets, use the broadcast primitive A broadcast is a special address that designates that all devices should receive the message Several network protocols and ... any network interface attached to the LAN Any device can read every frame transmitted if that device chooses and is configured to so When a device or interface reads every frame from the network, ...

Ngày tải lên: 13/08/2014, 04:21

... provide newer features and functions, the operating system may not completely support these improvements because the software may have been released before the hardware In this case, the hardware ... the user and are used to track the users’ activities once they are on the system The kernel ensures that security between users and between the system and users is always maintained For example, ... of their respective owners Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner,...

Ngày tải lên: 24/04/2014, 09:20

... provide newer features and functions, the operating system may not completely support these improvements because the software may have been released before the hardware In this case, the hardware ... the user and are used to track the users’ activities once they are on the system The kernel ensures that security between users and between the system and users is always maintained For example, ... of their respective owners Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner,...

Ngày tải lên: 13/08/2014, 04:21

... shell In this case, the user has been set up to use the bash shell instead of the other available shells We can verify to make sure that the stevem account has been added to the system as expected ... job may be members of the same group, where they need access to one or more text or database files On a new system, only a small handful of standard groups are defined and are usually related to ... Figure 3-15 In the example, the account of gwbush will be deleted The Delete Account window contains three selection items: Archive the Account’s Data, Delete the Account’s Data, and Leave the Account’s...

Ngày tải lên: 13/08/2014, 04:21

... with YES in the field Using the TAB key, navigate to the ethereal package and use the SPACEBAR to select it Then, select the Install (analyze)… menu item from the Actions menu and a new screen will ... with a new account didn’t completely remove the bang characters the first time Instead, the command needed to be repeated a second time before they were removed This is because two bang characters ... is accessed before the actual inactivity timer has expired 152 UNIX System Administration: A Beginner s Guide Expire Date This field denotes the absolute date when the account can’t be used any...

Ngày tải lên: 13/08/2014, 04:21

... operation and functions These keywords have associated values or parameters and are assigned with the equals (=) character Keywords can be either aliases or flags There are four alias types, as listed ... for all the systems (if there are just a few) or the IP address range (if there are several systems in the same range) If there are other systems in this IP address range that you are not the administrator ... a particular user Web server process Sun Remote Procedure Calls service SNMP master agent Table 7 -6 Standard NMAP Ports 218 UNIX System Administration: A Beginner s Guide Port Service Name Description...

Ngày tải lên: 13/08/2014, 04:21

... the SYN RECIEVED state Once the final ACK has been received, the ESTABLISHED state is reached and data transfer may begin When a TCP connection has been made, it will remain in the ESTABLISHED ... the path between node C and R1 become temporarily heavily loaded, for example, segments may be routed via the alternate path As a result, segments using the R2 path could arrive at the destination ... user authentication and the command interface When the user specifies a file transfer or executes a remote command, another session is established to service the transfer request After the transfer...

Ngày tải lên: 13/08/2014, 04:21

... the standard SNMP port of 161 For most needs, a single agent approach makes sense and is appropriate However, there are instances when more than one agent is necessary to achieve the desired level ... interface The data link protocol or hardware address The current administrative status of the interface The actual operating status of the interface The time when the interface became operational Additional ... value A data type representing zero or more octets, where each octet may take any value from to 255 A data type meant as a placeholder, but currently not used A data type representing an authoritatively...

Ngày tải lên: 13/08/2014, 04:21

... Solaris and HP-UX System Heartbeat A system heartbeat is used to determine the general health of a system In the case of SNMP, a system manager application uses a get request message to determine ... route fragments received datagrams reassembled reassembly failures datagrams fragmented fragmentation failures fragments created This output provides a quick snapshot of the network performance and ... output.file | wc -l 1 36 we see that a total of 1 36 packets were captured This is the number of packets needed to retrieve the interfaces table Please note that depending on the number of interfaces defined...

Ngày tải lên: 13/08/2014, 04:21

... Clear the lease of an existing assigned IP address Network Wizard Step-by-step process for creating a new network that can be used with the DHCP server Delete Networks Delete an existing network ... handles the processing of messages that have been sent by other programs; in the example above, the message was sent by the in.ftpd server As you can see from the message, the relevant information ... Make a copy of an existing IP address range Properties Display the properties of an existing IP address range Address Wizard Step-by-step process for IP address range creation Release Addresses...

Ngày tải lên: 13/08/2014, 04:21

... Make a file system available Make a new file system Simple command to make a new file system Change a user password Determine network node reachability Add a package on Solaris Remove a package ... this layer is known as a network repeater Data link and/or subnetwork layer: A device that operates on this layer includes a network bridge or switch Internet /network: A device that operates on ... object indicates the amount of time that has transpired since the network management agent was last started This doesn’t necessarily mean that the device itself has been operating since that...

Ngày tải lên: 13/08/2014, 04:21

... disease, a genetic disease, and even a disease of inflammation Bray (2004) considers obesity a “neurochemical” disease There is even a debate about whether obesity should be considered a disease at ... measurement of waist circumference As we can imagine, these measurements may vary considerably from examiner to examiner and even from one examination to another Often one examiner will take measurements ... take measurements several times in one area to get an average The measurements are also difficult to obtain accurately in very obese people Measurement of skinfold thickness is the least reliable of...

Ngày tải lên: 15/03/2014, 04:20

... likely to be smaller than conventional R P can even be negative since the ratio on the right-hand side of (2.5) can be greater than A negative P means that the forecast errors have a greater amount ... and especially the large ones, distorting the less extreme forecasts where the models are to be assessed Note also that the square of a variance error is the fourth power of the same error measured ... potentially be seen as a set similar to those tail observations provided that they are truly rare Outliers are by definition unusually large in scale They are so large that some have argued that...

Ngày tải lên: 22/03/2014, 23:20

... examples of the available methods for measuring the required parameters We not suggest that the methods illustrated are the only ones available Prueftechnik are specialists in the alignment and ... essential component of a viable maintenance strategy for rotating machines In isolation each strategy can help to reduce unexpected machine failure but taken together they form the hub of a proactive ... cooling tower fans or gas turbines, the catenary curve must be taken into consideration Machine catenary In a steam turbine for example the shafts are usually aligned to each other better than mils,...

Ngày tải lên: 08/08/2014, 11:21

... memory management as indicated rarely poses a problem There is another aspect of data warehouse tables that could cause some concern Data warehouse tables are denormalized and therefore the records ... bitmapped indexes have to be reconstructed Another disadvantage relates to the necessity to access the data tables all the time after the bitmapped indexes are accessed B-Tree indexes not require ... departmental data mart Next departmental data mart Gather departmental requirements, plan, and deploy the independe nt departmental one Gather departmental requirements, plan, and deploy the...

Ngày tải lên: 08/08/2014, 18:22

... language databases • LILACS/ CD-ROM Latin American and Caribbean Health Sciences Literature The only complete and updated database covering health related literature published in the Latin American ... because new web sites are continually added, and many change their location (URL) There are numerous search engines available Each search engine operates differently and consequently has different ... and new headings are regularly introduced The MeSH database can be searched from the MEDLINE/ PubMed web page Suggested MeSH titles will be provided for any search term entered by the searcher...

Ngày tải lên: 10/08/2014, 14:22

... qua Internet, VB6 có công cụ lập trình mà bạn cần thiết Các ấn Visual Basic Có ba ấn VB6: Learning, Professional Enterprise Chúng ta gát qua ấn Learning Bạn dùng ấn Professional hay Enterprise ... đ a compact cho VB6, tài liệu đính kèm gồm có sách Visual Studio Professional Features hai đ a CD Microsoft Developer Network (MSDN) Ấn Enterprise ấn Professional cộng thêm công cụ Back Office ... dụ thay đổi property Font Label thấy Label display Font chữ Khi bạn chọn Property control hay form Properties window, ph a bên phải chỗ value property display ba chấm ( .) hay tam giác ch a xuống...

Ngày tải lên: 22/03/2014, 12:20

... Inc All Rights Reserved Page of even available in versions suitable for home use The firewall creates a protective layer between the network and the outside world In effect, the firewall replicates ... Java Applets These devices enable animation and other special effects to run, making Web sites more attractive and interactive However, the ease with which these applications can be downloaded ... of a computer system Attacks Innumerable types of network attacks have been documented, and they are commonly classified in three general categories: reconnaissance attacks, access attacks, and...

Ngày tải lên: 14/03/2014, 22:20

... a table This feature means that the underlying query only needs to be executed once and then the results are available to all who need them From a database perspective, materialized views are ... mandatory keywords required to retrieve data from the database, there are three optional keywords Name them The optional parts of a select statement are the where clause, an order by statement, and ... need to be familiar when working with large databases These features are among the more advanced that you will encounter, but they're necessary, as databases are growing larger and larger When...

Ngày tải lên: 08/08/2014, 20:21