5 examples of network operating system
Principles of Network and System Administration 2nd phần 5 pot
... 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 ... hour of the day (in the form Hr00, Hr01 Hr23). ã Minutes in the hour (in the form Min00, Min17 Min 45) . ã A ve-minute interval in the hour (in the form Min00 05, Min 05 10 Min 55 00) ã A day of the...
Ngày tải lên: 13/08/2014, 22:21
principles of network and system administration phần 5 docx
Ngày tải lên: 14/08/2014, 12:20
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 cooperate in a network. If we look at computer systems analytically, ... 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 ... basic standards in order to work systematically. The type of hardware limits the kind of software that can run on it. Software requires hardware, a basic operating system infras- tructure and a...
Ngày tải lên: 03/06/2014, 01:29
Principles of Network and System Administration 2nd phần 2 doc
... netmask 255 . 255 . 252 .0, the two following could have mask 255 . 255 . 254 .0, the next two could have separately 255 . 255 . 255 .0 and 255 . 255 . 255 .0 and then the next four could have 255 . 255 . 252 .0 again. ... this: 128.39.0.0 ( 255 . 255 . 252 .0) 128.39.1.0 128.39.2.0 128.39.3.0 128.39.4.0 ( 255 . 255 . 254 .0) 128.39 .5. 0 128.39.6.0 ( 255 . 255 . 255 .0) 128.39.7.0 ( 255 . 255 . 255 .0) 72 CHAPTER 2. SYSTEM COMPONENTS 3. ... class B network 128.39.0.0. With a netmask of 255 . 255 . 255 .0 everywhere on this network, we divide it up into 255 separate subnets, each of which has room for 254 hosts ( 256 minus the network...
Ngày tải lên: 13/08/2014, 22:21
Principles of Network and System Administration 2nd phần 3 pptx
... 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 ... which replace many of the older Unix equivalents, like ls and cp. GNU software has its own system of installation and set of standards. GNU will also eventually become an operating system in its own right. ... the advantage of allowing every host to mount the same filesystem, but the disadvantage of making the single filesystem very large. Software is installed in 5. 2. USER REGISTRATION 151 fileformatisthefollowing: mark:Ax7Wc1Kd8ujo2:123: 456 :Mark...
Ngày tải lên: 13/08/2014, 22:21
Principles of Network and System Administration 2nd phần 4 potx
... 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 ... with another. 222 CHAPTER 6. MODELS OF NETWORK AND SYSTEM ADMINISTRATION 6 .5. 5 Software synchronization In section 3.8.9 we discussed the distribution of data amongst a network com- munity. This technique ... 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...
Ngày tải lên: 13/08/2014, 22:21
Principles of Network and System Administration 2nd phần 6 pot
... 192.0.2.11; // Not this host! 192.0.2.0/24; // Net with 24 bit netmask set. i.e. 255 . 255 . 255 .0 192.0.74.0/23; // 23 . 255 . 255 . 254 .0 }; zone "domain.tld" { type master; file "master/domain.tld"; allow-transfer ... services Network services are the crux of network cooperation (see section 3 .5) . They distinguish a cooperative network from a loose association of hosts. A community is bound together by a web of ... 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...
Ngày tải lên: 13/08/2014, 22:21
Principles of Network and System Administration 2nd phần 7 doc
... control list for filesystems # which may be exported to NFS clients. See exports (5) . /site/cube/local *.college.edu/ 255 . 255 . 255 .0(rw) /site/cube/local 192.0.2./ 255 . 255 . 255 .0(rw) ... 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 ... compiler test program 11.1. FOUR INDEPENDENT ISSUES 4 25 Principle 56 (Security is a property of systems). Security is a property of entire systems, not an appendage that can be added in any one...
Ngày tải lên: 13/08/2014, 22:21
Principles of Network and System Administration 2nd phần 8 pps
... code string as an argument: key 659 ta 550 95 passwd: ******* 452 CHAPTER 11. PRINCIPLES OF SECURITY (b) DNSSec can use digital signatures to solve the problem of authenticity for zone transfers ... 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. ...
Ngày tải lên: 13/08/2014, 22:21
Principles of Network and System Administration 2nd phần 9 potx
... 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. ... credible? 4. If a piece of software has a MTBF of two hours and an average downtime of 15 seconds, does it matter that it is unstable? 5. Explain why one would expect measurements of local SMTP traffic ... 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...
Ngày tải lên: 13/08/2014, 22:21
Principles of Network and System Administration 2nd phần 10 pps
... size = 55 bytes from -> to IP D=192.0.2.238 S=192.0.2.10 LEN=41, ID =53 512 from -> to TCP D=23 S =54 657 Ack=82641 954 4 Seq=40 950 44478 Len=1 Win=8760 from -> to TELNET C port =54 657 m B.3 ... size = 55 bytes from -> to IP D=192.0.2.238 S=192.0.2.10 LEN=41, ID =53 523 from -> to TCP D=23 S =54 657 Ack=82641 956 0 Seq=40 950 44484 Len=1 Win=8760 from -> to TELNET C port =54 657 p ________________________________ to ... LEN=40, ID =54 348 from -> to TCP D=23 S =54 657 Ack=826420029 Seq=40 950 4 450 5 Len=0 Win=8760 from -> to TELNET C port =54 657 ________________________________ B.3 WWW AND CGI PROGRAMMING 57 9 #!/local/bin/perl # #...
Ngày tải lên: 13/08/2014, 22:21
principles of network and system administration phần 1 docx
... DiscussionofMarginalCostPricing 130 5. 5 CostRecovery 131 5. 5.1 RamseyPrices 131 5. 5.2 Two-partTariffs 133 5. 5.3 OtherNonlinearTariffs 1 35 5.6 FiniteCapacityConstraints 137 5. 7 Network Externalities . . ... 123 5. 4.3 DiscussionofAssumptions 124 5. 4.4 Peak-loadPricing 1 25 5.4 .5 Walrasian Equilibrium . . . . . . . . . . . . . . . . . . . . . . . . . 126 5. 4.6 ParetoEfficiency 127 5. 4.7 DiscussionofMarginalCostPricing ... . . . . . . . 51 3.3.2 OpticalNetworks 53 3.3.3 Ethernet 54 3.3.4 Synchronous Services . . . . . . . . . . . . . . . . . . . . . . . . . 56 3.3 .5 ATMServices 57 3.3.6 FrameRelay 59 3.3.7 InternetServices...
Ngày tải lên: 14/08/2014, 12:20
principles of network and system administration phần 2 pot
... multiples of 155 .52 Mbps. An important quality of service provided by SONET and SDH networks is the ability to recover in the event of fibre disruption or node failure. The nodes of SONET and SDH networks ... multiples of the basic 155 .52 Mbps container. For instance, a 2.488 Gbps SONET link can provide for a single 2.488 Gbps SONET service or four services of 622.08 Mbps, or two 622.08 Mbps and four 155 .52 ... 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...
Ngày tải lên: 14/08/2014, 12:20
principles of network and system administration phần 3 potx
... should produce more than 950 cells in a slot is about 0.0000 155 . Thus for a CLP of 1 :55 ð 10 5 , we can take x stat. D 900 and there is a statistical multiplexing gain of 900=190 D 4:74. This ... distributed as a binomial random variable B .5; 0:2/. Thus, h D 5andx peak D 950 =5 D 190. The mean number of cells that one source produces is m D 5 ð 0:2 D 1, and the number of cells that 900 sources produce ... 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...
Ngày tải lên: 14/08/2014, 12:20
principles of network and system administration phần 6 potx
Ngày tải lên: 14/08/2014, 12:20
