10 examples of network operating system
Principles of Network and System Administration 2nd phần 10 pps
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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 ... memory
image of a Perl program is often smaller than that of a shell script when all of the
sub-programs of a shell script are taken into account. We have barely scratched
the surface of Perl here. ... (11) :102 3 102 9, 1984.
[175] J.O. Kephart. A biologically inspired immune system for computers.
Proceedings of the Fourth International Workshop on the Synthesis and
Simulation of Living Systems...
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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, ... are some examples of the relationship between binary, octal and the
textual representation of file modes.
Binary Octal Text
001 1 x
010 2 -w-
100 4 r
110 6 rw-
101 5 r-x
- 644 rw-r r
10 CHAPTER ... security.
2.3.3 Securable operating systems
To distinguish them from insecure operating systems we shall refer to operating
systems like Unix and NT as securable operating systems. This should not...
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Principles of Network and System Administration 2nd phần 2 doc
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13/08/2014, 22:21
... There are
two types of Windows system with separate software licenses: workstations
and servers.Windowscanworkasastand-alonesystemorasaworkstation,
integrated into a system of network services. ... mach.
Knowing the operating system of a host is not sufficient. We also need to know
what kind of resources the host has to offer the network, so that we can later plan
60 CHAPTER 2. SYSTEM COMPONENTS
Net ... (255.255.255.0)
72 CHAPTER 2. SYSTEM COMPONENTS
3. What effect does temperature have on computer systems?
4. What is the function of an operating system? (Hint: how do you define an
operating system? )
5. Why...
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Principles of Network and System Administration 2nd phần 3 pptx
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13/08/2014, 22:21
... University of Edinburgh was
described in ref. [10] , and another from the University of Waterloo uses a file tree
/software to similar ends in ref. [273]. In the Soft environment [109 ], software
installation ... of software within a directory tree: some software
packages compile the names of important files into software binaries. Explain
why the use of a universal naming scheme guarantees that the software ... to the system before change strikes.
A plan is needed for testing new versions of software. Package systems for
software make this process easier, since one can allow several versions of software
to...
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Principles of Network and System Administration 2nd phần 4 potx
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13/08/2014, 22:21
... 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 ... territory of more
intelligent agent systems like cfengine and PIKT.
Despite the shortcomings of SNMP for host operations, many operating systems
do define their own MIBs for the collection of system ... build software
systems which apply certain principles to the problem of management. Network
management has, to some extent, been likened to the process of software develop-
ment in the System...
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Principles of Network and System Administration 2nd phần 5 pot
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13/08/2014, 22:21
... 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 ... 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 ... study of networks reveals that networks with the small-world property
also exhibit so-called ‘scale-free’ behavior, over a wide range of scales. In other
words, over a wide range of scales, the networks...
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Principles of Network and System Administration 2nd phần 6 pot
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13/08/2014, 22:21
... plan for loss of some of the hosts.
EXERCISES 327
8. What is meant by the environment of a system?
9. How does one find the boundary between system and environment?
10. What kind of faults can ... 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 ... graphical representation of the system to a human in
order to provide an executive summary of its state.
8.11. SYSTEM PERFORMANCE TUNING 317
Excessive network traffic is also a cause of impaired performance....
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Principles of Network and System Administration 2nd phần 7 doc
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13/08/2014, 22:21
... the case of network service), and must choose strategies for
maximizing their interests. We can therefore construct a ‘payoff’ matrix for each of
the two users (see tables 10. 1, 10. 2 and 10. 3). ... 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 ... forwarding path. A
404 CHAPTER 10. NETWORK- LEVEL SERVICES
Figure 10. 5: A simplified view of the approximately two-level hierarchy of the Internet. If
we arrange the Autonomous Systems in a circle, we...
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Principles of Network and System Administration 2nd phần 8 pps
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13/08/2014, 22:21
... 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 ... nature of possible threats to the security of a human–computer
system.
444 CHAPTER 11. PRINCIPLES OF SECURITY
Authentication is usually performed at the start of a session between client and
system. ... In
earlier times, it was normal to backup the operating system partitions of hosts to
tape. Today that practice is largely unnecessary: the operating system is readily
available on some straightforward...
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Principles of Network and System Administration 2nd phần 9 potx
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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. ... of the environment around it. The system is open
because input changes the state of the system s internal variables and output
changes the state of the environment. Every piece of computer software ... basis of programming
algorithms in computer software and the same thing applies to conglomerations of
different software systems. The same principle applies to the storage of any kind
of information....
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principles of network and system administration phần 1 docx
Ngày tải lên :
14/08/2014, 12:20
... . 245
10. 4AModelofTCP 247
10. 5AllocatingFlowsbyEffectiveBandwidth 249
10. 6UserAgents 250
10. 7PricingUncertainty 254
10. 8TheDifferentiatedServicesApproach 256
10. 8.1 ParisMetroPricing 257
10. 9TowardsaMarket-ManagedNetwork ... 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 ... to install it at the e dge of the network, rather than in each link of the network
separately. Complexity and service differentiation is pushed to the edges of the network.
The reduction in redundancy...
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principles of network and system administration phần 2 pot
Ngày tải lên :
14/08/2014, 12:20
... manner, without preallocating any slots. Examples of synchronous
networks are ISDN (Integrated Services Digital Network) , SDH and SONET. Examples of
asynchronous networks are the Internet, Frame Relay ... transmitted only if no other node of
the Ethernet network is transmitting. The transmission speeds are from 10 Mbps to 10 Gbps
in multiples of ten (and since the price of a 10 Gbps Ethernet adaptor card ... concrete examples of Service Level Agreements for ATM and Frame
Relay can be seen at the web sites of Nortel Networks (2002a) and (2002b).
The concepts of network service layering and quality of service...
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principles of network and system administration phần 3 potx
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14/08/2014, 12:20
... service of type i and such service requests
90 NETWORK CONSTRAINTS AND EFFECTIVE BANDWIDTHS
arrive at a rate of x
i
per T
i
units of time, then the mean number of services of type i in
the network ... lines
R
3
R
2
R
1
R
4
ATM network
virtual path
R
3
R
2
R
1
R
4
datagram
network
R
3
R
2
R
1
R
4
Figure 3 .10 Some possible virtual private networks. In (a) we show the logical network that
connects the four routers of ... the minimum of linear functions of x,the
right-hand side of (4.11) defines a concave function of x and so each A
t
is the complement
of a convex set (refer to Appendix A for definitions of concave...
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