use of network operating system

Performance Analysis of Network-MIMO Systems

principles of network and system administration

... administration, the word system is used to refer both to the operating system of a computer and often, collectively the set of all computers that cooperatein a network. If we look at computer systems analytically, ... environmentA key task of network and system administration is to build hardware conﬁgura-tions, another is to conﬁgure software systems. Both of these tasks are performedfor users. Each of these tasks ... Multi-user operating systemsThe purpose of a multi-user operating system is to allow multiple users to sharethe resources of a single host. In order to do this, it is necessary to protect usersfrom...

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... and multiuser operating systems?6. What is meant by a securable operating system? 7. What is meant by a shell?8. What is the role of a privileged account? Do non-securable operating systemshave ... Unix at the forefront of new technology but has alsocreated a class of operating systems rather like disorganized piles of treasurein Aladdin’s cave.Unix-like operating systems are not tied ... normalization of the system. The principle of specialization also applies in system administration. Indeed, inrecent years the number of client-server systems has grown enormously, because 2.8....

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... Unix-like systems they are defined in the /etc/group file, like this:users::100:user1,mark,user2,user3The name of the group, in this case, is users, with group-id 100 and membersuser1, mark, user2 ... Unix-like systems provide shell scripts oruser interfaces for installing new users, but most of these scripts are useless,because they follow a model of system layout which is inadequate for a network environment, ... numbers of system groups vary with different flavors of Unix. Theroot group has superuser privileges.Unix groups can be created for users or for software which runs under a specialuser-id....

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... operating systems in a network environment is achallenge both to users and administrators. Each operating system services aspeciﬁc function well, and if we are to allow users to move from operating ... competing system toSNMP called COPS-PR [101]. 6.3. NETWORK ADMINISTRATION MODELS 2076.3 Network administration modelsThe management of clusters of systems leads to the concept of logistic networks.Here ... amount of disk space used by each user andwarn about users that exceed a ﬁxed quota. 200 CHAPTER 6. MODELS OF NETWORK AND SYSTEM ADMINISTRATION6.1.2 Unix legacy directoriesBefore networking...

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... top of a host operating system, often as an exter-nally available service, they usually have their own independent usernames andpasswords, separate from regular user accounts. Not all users of ... services,like web mail, often consist of a farm of PCs running FreeBSD Unix (this hasretained the record for the most efﬁcient network handling of all the operating systems to date), backed ... freak coincidence of humansocial structures; it is a property of a kind of network known as a small-world network [319].Deﬁnition 6 (Small-world network) . There is a class of highly clustered...

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... 303].More often than not, performance tuning is related to the availability or sharing of system resources. This requires tuning the system kernel. The most conﬁgurablepiece of software on the system ... X-terminal software, we need to increase many of the default system parameters. The maxusers parameter (actually in most Unix-like systems)is used as a guide to estimating the size of many tables ... payoff. The lower wavy line is the cumulativepayoff resulting from good users, while the upper line represents the payoff from bad users.The upper line doubles as the magnitude of the payoff...

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... SambaSamba is a free software solution to the problem of making Unix ﬁlesystemsavailable to Windows operating systems. Windows NT uses a system of network ﬁle sharing based on their own SMB (Server ... human–computer system. Anything that can cause a failure of those assumptions can result in loss,and must therefore be considered a threat. In system administration terms thisoften means a loss of data ... details of this are beyond the scope of the present book.3Example 14. The simplest kind of SLA is that offered by Internet Service Providers,using ADSL lines, who might offer a home user a...

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... access to the system, andall of our activities then occur within the scope of an identiﬁer which representsthat user. On Unix-like systems, the username is converted into a global uniqueuser-id ... security for individuals, we need to keep track of the identity of users who make requests of the system. Authentication meansdetermining whether the claim of identity is authentic. Usually we mean ... the case of an accident.In the unlikely event of every host being destroyed simultaneously, downloadingthe software again from the network is the least of your worries!Reconstructing a system...

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... impressions include the amount of dependency of a softwarecomponent on other software systems, hosts or processes; also the dependency of a software system on the presence of a human being. In ref. ... dominated by servicerequests from users.– Social patterns of the users– Systematic patterns caused by software systems.Identifying such patterns in the variation of the metrics listed above is ... outputchanges the state of the environment. Every piece of computer software is anopen system. Even an isolated total computer system is an open system aslong as any user is using it. If we...

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... burned into the network interface.ã Memory image: A copy of some software in the actual RAM of the system. Often used to refer to the resident size of a program, or the amount of memoryactually ... source: A software ‘trademark’ for software whose source ﬁles are madeavailable to users. This is similar to the idea of Free Software, but it does notnecessarily license users the ability to use ... available executable binaries for agiven type of platform. A binary server is operating system speciﬁc, sincesoftware compiled on one type of system cannot be used on another. (Seealso Home server.)ã...

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... competing product because the learning curve for this type of softwareis very steep. Similarly, Microsoft Word commands a good price because of a network externality effect: the number of people who ... PRICING AND COMMUNICATIONS NETWORKSa network increases as the square of the number of users. It relates to the idea of network externality and the fact that a larger network has a competitive ... one,because each of the larger network s users can communicate with a greater number of otherusers. It makes the growth of a large customer base especially important. With this in mind,a network...