Network Security | Computer Network


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 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 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): -

Port scanner
Idle scan
Denial-of-service attack
Man in the middle
ARP poisoning
Smurf attack
Buffer overflow
Heap overflow
Format string attack
SQL injection
Cyber Attack

Network security management:

AAA (Tripple – A: Authentication, Authorization, Auditing)
Firewall & UTM (Unified Threat Management) system
Cryptography and encryption
VPN (Virtual Private Network)
Policies and guidelines
Physical security