In order to ensure security, confidentiality and authenticity for a message over a network crossing, many things should be done with companies networks. Every network at each firm needs to ensure the security of there local network is completely safe. It is done using a variety of means.

 A renowned firewall is required for controlling and monitoring online traffic to and from the internet at the transport layer in order to ensure communications are the type of communication the companies allows using its security policy.

 To stop unwanted users from creating their own connections to the network stringent network security auditing is required, auditing the software that runs inside the network is pretty crucial so as to remove the chance of any spy software running. A firm policy is required to decided what users can access and how.

 At the physical layer, a firm can choose optical fibre in order to reduce the chance of snooping. But, it tends to prove impractical on a local area network. You should avoid the use of radio networks as much as possible because these can be easily snooped. If there is a dire need of radio communication, then it must be encryption at the data link layer is important.

Once the important data is to be sent over the network then the data-link layer and physical layer cannot be encrypted as stated before. It is because routers only operate at layer-3 the network layer to make routing decision therefore the payload inside data at the network layer doesn’t need to be decipherable but headers added at network layer are widely used to make routing decisions and do need to be readable.

 At network layer it is quite common to encrypt the data from the gateway to the internet at one company to the gateway of another company. These use a shared key which changes over time and all the data sent over the network is fully encrypted and deciphered at the another end. However, this mean that inside the networks of both companies the data travels unencrypted.

 In addition to this, it is possible to encrypt data at the transport layer for a known type of protocol that has to be agreed beforehand. This helps to encrypt a connection end-to-end for an application that means it travels over local encrypted network as well as through the public internet network.

 Transport layer security provides some level of authenticity that the network connection is to the person although it cannot provide full authentication. However, it is an excellebnt source of confidentiality as the only place data exists deciphered is in the remote and local machines and it shouldn’t be possible to snoop in order to find out the contents. A information security company can provide effective services to secure network with the help of latest security testing tools.