Network Security

Network security consists of the provisions and policies adopted by a network administrator to prevent and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, which is controlled by the network administrator. Users choose or are assigned an ID and password or other authenticating information that allows them access to information and programs within their authority.

Network security concerns:

Secrecy

Secrecy has to do with keeping information out of the hands of unauthorized users. This is what usually comes to mind when people think about network security.

Authentication

Authentication deals with determining whom you are talking to before revealing sensitive information or entering into a business deal.

Non-repudiation and Integrity Control

Non-repudiation deals related with signatures. Assurance that a message received was really the one sent and not something that a malicious adversary modified in transit or concocted.

Physical Security

It is the most fundamental of all security levels because it deals with securing your technology equipment from damage or theft, protecting it against accidental power surges, and the like.

Common Network security risks (attacks): -

wiretapping

Port scanner

Idle scan

Denial-of-service attack

Spoofing

Man in the middle

ARP poisoning

Smurf attack

Buffer overflow

Heap overflow

Format string attack

SQL injection

Cyber Attack