Network security consists of the policies, processes and practices adopted to prevent, detect and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources.
Network security is important for home networks as well as in the business world. Most homes with high-speed internet connections have one or more wireless routers, which could be exploited if not properly secured. A solid network security system helps reduce the risk of data loss, theft and sabotage.Securing a network requires a complex combination of hardware devices, such as routers, firewalls and anti-malware software applications.
Active Devices
These security devices block the surplus traffic. Firewalls, antivirus scanning devices, and content filtering devices are the examples of
such devices.
Passive Devices
These devices identify and report on unwanted traffic, for example, intrusion detection appliances.
Preventative Devices
These devices scan the networks and identify potential security problems. For example, penetration testing devices and vulnerability
assessment appliances.
Unified Threat Management (UTM)
These devices serve as all-in-one security devices. Examples include firewalls, content filtering, web caching, etc.
Privacy: Privacy means both the sender and the receiver expects confidentiality. The transmitted message should be sent only to the intended receiver while the message should be opaque for other users. Only the sender and receiver should be able to understand the transmitted message as eavesdroppers can intercept the message. Therefore, there is a requirement to encrypt the message so that the message cannot be intercepted. This aspect of confidentiality is commonly used to achieve secure communication.
Message Integrity: Data integrity means that the data must arrive at the receiver exactly as it was sent. There must be no changes in the data content during transmission, either maliciously or accident, in a transit. As there are more and more monetary exchanges over the internet, data integrity is more crucial. The data integrity must be preserved for secure communication.
End-point authentication: Authentication means that the receiver is sure of the sender?s identity, i.e., no imposter has sent the message.
Non-Repudiation: Non-Repudiation means that the receiver must be able to prove that the received message has come from a specific sender. The sender must not deny sending a message that he or she send. The burden of proving the identity comes on the receiver. For example, if a customer sends a request to transfer the money from one account to another account, then the bank must have a proof that the customer has requested for the transaction.
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