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