Principles of Network and System Administration 2nd phần 5 pot

... attempts to keep track of changes in individual systems using a method of revision control. A typical Unix system might consist of thousands of files comprising software and data. All of the files (except ... digested, understood and, not least, obeyed by users and system staff alike. • Determine the system policy. This is the prerequisite for all system mainte- nance. Kn...

Ngày tải lên: 13/08/2014, 22:21

... in 1994 by Kephart of IBM in ref. [1 75] and later expanded upon by Forrest et al. [118, 291, 121, 119, 156 , 290, 317, 155 , 94, 120, 238, 93]. The analogy between system administration and immunology ... 6 Models of network and system administration Understanding human–computer systems requires an ability to see relationships between seemingly distinct parts of a syst...

Ngày tải lên: 13/08/2014, 22:21

... 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 // Allows ls domain.tld in nslookup { // and ... 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...

Ngày tải lên: 13/08/2014, 22:21

... state of the system s internal variables and 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 ... 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 m...

Ngày tải lên: 13/08/2014, 22:21

... 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...

Ngày tải lên: 13/08/2014, 22:21

... 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. ... disk filesystem (called ufs, hfs etc.) (which means a physical disk) and the NFS network filesystem. If we mount a 4.2 filesystem it means that it is, by definition, a loc...

Ngày tải lên: 13/08/2014, 22:21

... 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) ... Scientific Principles of Network and System Administration, J. Wiley & Sons, 2004. 10.4. ALTERNATIVE NETWORK TRANSPORT TECHNOLOGIES 399 by N bits, or wavelengths of the bit signal,...

Ngày tải lên: 13/08/2014, 22:21

... 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 ... 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 betw...

Ngày tải lên: 13/08/2014, 22:21

... = 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 WWW AND ... 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...

Ngày tải lên: 13/08/2014, 22:21