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LO2 (Communication Methods 2.7: (SMS:A text messaging service component of…
LO2
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2.1 Types of software
Open source-
A type of computer software in which source code is released for anyone the code can be altered. e.g. Chrome
Closed Source-
The source code is not shared with the public for anyone to look at or change. The Code has to be paid in order to be accessed. e.g Microsoft
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Utility Software 2.3:
Anti virus software-
A computer program used to prevent, detect, and remove malware and viruses
Compression software- it can directly share your files with multiple recipients and perform encryption of files with passwords.
Disk defragmenter-A utility in Microsoft Windows designed to increase access speed by rearranging files stored on a disk to occupy contiguous storage locations, a technique called defragmentation.
Backup Software-
Computer programs used to perform backup they create supplementary exact copies of files, databases or entire computers.
Types of OS 2.4,2.5,2.6:
Multi User-A computer system that allows multiple users that are on different computers to access a single system's OS resources simultaneously. This can be used at school computers
Single Processor-System contains only one processor. So only one process can be executed at a time. E.g Nokia
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Multi processor:
Multiprocessor is a computer system having two or more processing units each sharing main memory and peripherals, in order to simultaneously process programs.
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2.9 Protocols:
Protocols:
A protocol is a set of rules and guidelines for communicating data. Rules are defined for each step and process during communication between two or more computers. Networks have to follow these rules to successfully transmit data.
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UDP:
Similar to TCP but it is used for established low latency and connection which tolerate loss and disordering of data packets.
SMTP(Simple Mail Transfer Protocol):
This protocol is responsible sending emails
Emails uses this protocol to communicate with mail servers.
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FTP(File Transfer Protocol):
Works alongside TCP/IP
Set of rules that govern hardware and software setting transferring files over the internet.
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SNMP(Simple Network Management Protocol):
Protocol which gathers statistics such as status on:
CPU
Memory
Buffer
Also collects error information
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