Microsoft Excel : How to use Formulas in Excel

Know about How to use Formulas in Excel

Microsoft Excel 2013 : How to Create Graphs

Create Graphs in Microsoft Excel

Information Security: Denial of Service (DOS) Attack and Intrusion Deduction System

Denial of Service (DOS): It is an Attack on the Availability of network resources

Ways to Intitiate the DOS are :-

1. Transmission Failure
2. Traffic Redirection
3. DNS Attack
4. Connection Flooding

Types of Connection Flooding Attack

1. ECHO Chargen
2. Ping of Death
3. Smurf Attack
4. SYN Flood
5. Teardroop

Distributed Denial of Service Attack (DDoS): When a attacker uses a convenient method to distribute trojan horses to as many target machine  possible 

Security

Intrusion Detection System (IDS) : It is a device that monitors and deduct the suspicious events

Terminology used in IDS

• Anomaly
• Misuse
• Intrusion
• Audit
• Profiling

Goals of Intrusion Deduction System

• Detect Attach properly
• Monitor System Effectively with minimal resources

Response of IDS

• Monitor the Attack
• Protect system and reduce exposure
• Alter a human

Microsoft Excel : Basics

MapReduce

Hadoop

What is Hadoop?

Difference of Hadoop and SQL

Regression Testing

It is a testing performed during change management (when a function/ module/ program is changed or added to the existing software) in order to ensure that new/ changed functions executes properly and integrates with other module as expected.  

The purpose of regression testing is to confirm that a  recent program or code change has not adversely affected existing features.

Regression testing is nothing but full or partial selection of already executed test cases which are re-executed to ensure existing functionalities work fine.

This testing is done to make sure that new code changes should not have side effects on the existing functionalities. It  ensures that old code still works once  the new code changes are done.