use of network operating system
principles of network and system administration
Ngày tải lên :
03/06/2014, 01:29
... 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 cooperate
in a network. If we look at computer systems analytically, ... environment
A key task of network and system administration is to build hardware configura-
tions, another is to configure software systems. Both of these tasks are performed
for users. Each of these tasks ... Multi-user operating systems
The purpose of a multi-user operating system is to allow multiple users to share
the resources of a single host. In order to do this, it is necessary to protect users
from...
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Principles of Network and System Administration 2nd phần 2 doc
Ngày tải lên :
13/08/2014, 22:21
... 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 systems
have ... Unix at the forefront of new technology but has also
created a class of operating systems rather like disorganized piles of treasure
in Aladdin’s cave.
Unix-like operating systems are not tied ... normalization of the system.
The principle of specialization also applies in system administration. Indeed, in
recent years the number of client-server systems has grown enormously, because
2.8....
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Principles of Network and System Administration 2nd phần 3 pptx
Ngày tải lên :
13/08/2014, 22:21
... Unix-like systems they are defined in the /etc/group file, like this:
users::100:user1,mark,user2,user3
The name of the group, in this case, is users, with group-id 100 and members
user1, mark, user2 ... Unix-like systems provide shell scripts or
user 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. The
root group has superuser privileges.
Unix groups can be created for users or for software which runs under a special
user-id....
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Principles of Network and System Administration 2nd phần 4 potx
Ngày tải lên :
13/08/2014, 22:21
... operating systems in a network environment is a
challenge both to users and administrators. Each operating system services a
specific function well, and if we are to allow users to move from operating ... competing system to
SNMP called COPS-PR [101].
6.3. NETWORK ADMINISTRATION MODELS 207
6.3 Network administration models
The management of clusters of systems leads to the concept of logistic networks.
Here ... amount of disk space used by each user and
warn about users that exceed a fixed quota.
200 CHAPTER 6. MODELS OF NETWORK AND SYSTEM ADMINISTRATION
6.1.2 Unix legacy directories
Before networking...
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Principles of Network and System Administration 2nd phần 5 pot
Ngày tải lên :
13/08/2014, 22:21
... top of a host operating system, often as an exter-
nally available service, they usually have their own independent usernames and
passwords, separate from regular user accounts. Not all users of ... services,
like web mail, often consist of a farm of PCs running FreeBSD Unix (this has
retained the record for the most efficient network handling of all the operating
systems to date), backed ... freak coincidence of human
social 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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Principles of Network and System Administration 2nd phần 6 pot
Ngày tải lên :
13/08/2014, 22:21
... 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 configurable
piece 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 cumulative
payoff 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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Principles of Network and System Administration 2nd phần 7 doc
Ngày tải lên :
13/08/2014, 22:21
... Samba
Samba is a free software solution to the problem of making Unix filesystems
available 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 this
often means a loss of data ... details of this are beyond the scope of the present book.
3
Example 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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Principles of Network and System Administration 2nd phần 8 pps
Ngày tải lên :
13/08/2014, 22:21
... access to the system, and
all of our activities then occur within the scope of an identifier which represents
that user. On Unix-like systems, the username is converted into a global unique
user-id ... security for individuals, we need to keep track of
the identity of users who make requests of the system. Authentication means
determining 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, downloading
the software again from the network is the least of your worries!
Reconstructing a system...
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Principles of Network and System Administration 2nd phần 9 potx
Ngày tải lên :
13/08/2014, 22:21
... impressions include the amount of dependency of a software
component 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 service
requests 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 ... output
changes the state of the environment. Every piece of computer software is an
open system. Even an isolated total computer system is an open system as
long as any user is using it. If we...
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Principles of Network and System Administration 2nd phần 10 pps
Ngày tải lên :
13/08/2014, 22:21
... 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 memory
actually ... source: A software ‘trademark’ for software whose source files are made
available to users. This is similar to the idea of Free Software, but it does not
necessarily license users the ability to use ... available executable binaries for a
given type of platform. A binary server is operating system specific, since
software compiled on one type of system cannot be used on another. (See
also Home server.)
ã...
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principles of network and system administration phần 1 docx
Ngày tải lên :
14/08/2014, 12:20
... competing product because the learning curve for this type of software
is very steep. Similarly, Microsoft Word commands a good price because of a network
externality effect: the number of people who ... PRICING AND COMMUNICATIONS NETWORKS
a 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 other
users. It makes the growth of a large customer base especially important. With this in mind,
a network...
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