A string is generally considered as a data type and is often implemented as an array data structure of bytes (or words) that stores a sequence of elements, typically characters, using some character encoding. String may also denote more general arrays or other sequence (or list) data types and structures.
Answer:
c. prompt(text[,default Input])
Explanation:
In javaScript the prompt() method displays a dialog box which allows the user input text required by the program.
The most popular Operating Systems are:
Android
IOS
Windows
The allocation methods define how the files are stored in the disk blocks.
There are three main disk space or file allocation methods:
1.Contiguous Allocation-in this scheme,each file occupies a set of blocks on the disk. For example if a file requires x blocks and is given a block y as the starting location,then the blocks assigned to the file be :x,y+1,y+2,......y+x-1.
This means that given the starting block address and the length of the file(in terms of blocks required) we can determine the blocks occupied by the file.
Advantages
-both the sequential and direct accesses are supported
-this is extremely fast since the number of seeks are minimal because of contiguous allocation of file blocks.
2.linked allocation-in this scheme,each file linked list of disk blocks which need not be contiguous disk blocks can be scattered anywhere on the disk.
Advantages
it is very flexible in terms of file size.file size can be increased easily since the system does not have to look for a contiguous chunk
of memory.
this method does not suffer from external fragmentation and it makes it relatively better in terms of memory utilization.
3.Indexed Allocation-in this scheme,a special block known as the index block contains the pointers to all the blocks occupied by a file.Each file has its own index block.the entry in the index block contains the disk address of the block
Advantages
it supports direct access to the blocks occupied by the file and therefore provides fast access to the file blocks
it overcomes the problem of external fragmentation.
Is an example of reactive, signature based IDS/IPS
Reactive, signature based IDPS technology is one of the many methodologies used to detect attacks. In a signature based IDS, a misuse detection identifies intrusions by watching for patterns of traffic and compare them against observed events or a database of signatures from known threats. Reactive IDS/IPS, on the other hand, will not only detect and alert malicious traffic but also take pre-defined proactive actions. Using MRTG, Ntop, and SNMPC in routers will monitor traffic and help network managers easily see issues like DOS attacks and security problems.
