Access methods

-

Access methods
-       How data are go in and go out from cable
-       To make sure the data flow is correct

Two types of access method
-       CSMA
-       Token passing

CSMA (Carrier-sense multiple access)
Two types of CSMA
-CSMA/CD – with Collision Detection
-CSMA/CA – with Collision avoidance

CSMA/CD
-       All devices in the network listen to the network, if there is no one is using they send message
-       To detect and senses
-       If someone is sending a message , you need to wait to avoid collision
-       Listen first the cable if someone is using the cable

CSMA/CA
-       Take queue and orderly
-       All the devices need to inform the network if they want to send a message

Token passing
-       Usually use ring topology
-       when the token is free, than someone can send the message

Comments

Post a Comment

Popular posts from this blog

Log Review

-
Image
Describe the test and purpose of the test Log analysis is the term used for analysis of computer-generated records for helping organizations, businesses or networks in proactively and reactively mitigating different risks.  Log analysis helps in reducing problem diagnosis, resolution time and in effective management of applications and infrastructure. Checking all the log to find if there ordinary problem Discuss how it works Logs are usually created by network devices, applications, operating systems, and programmable or smart devices. They comprise of several messages that are chronologically arranged and stored on a disk, in files, or in an application like a log collector. Provide example Discuss the solution of there is vulnerability after a test If there is 
Read more

Social engineering

-
What is social engineering? Social engineering is the act of tricking someone information or taking action, usually through technology. How social engineering works? Baiting They lure users into a trap that steals their personal information or inflicts their systems with malware. Scareware Scareware involves victims being bombarded with false alarms and fictitious threats. Phishing Phishing is a cybercrime in which a target or targets are contacted by email, telephone, or text message to steal information. Email hacking and contact spamming Some criminals try to take advantage of this by commandeering email accounts and spamming account contact lists. How to prevent 1. Don’t open emails and attachments from suspicious sources 2. Install antivirus software or a security suite 3. Be wary of tempting offers 4. Keep your software up to date 5. Delete any request for personal information or passwords. References What is Social Engineering | Attack Techniq...
Read more

LO3 Know the features and function of information systems part 2

-
3.4 Types of information system 3.4.1 Management information systems - Computerized database of financial information organized and programmed in such a way that it produces regular reports on operations for every level of management in a company. 3.4.2 Others 3.4.2.1 Marketing information systems(sales performance,competitors etc) - System that analyzes and access marketing information, gathered from sources inside and out an organization. 3.4.2.2 Financial information system (financial costs, investment returns etc) - Type of business software used to input accumulate, and analyze financial and accounting data 3.4.2.3 Human resources information system (HR) (staffing, professional development etc) - basically an intersection of human resources and information technology through HR software. 3.5 Management Information system (MIS) 3.5.1 Features; Database Management - Ability to store data and make that data easy to retrieve by the system's users. Reporting - ...
Read more