From the course: Network Forensics
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Subnets, subnet ID, and subnet mask
- [Instructor] A Subnet is a mechanism to divide a Local Area Network or LAN into multiple independent networks. Creating Subnets improves security by reducing visibility between hosts. A host in LAN Subnet is not able to communicate directly with its peers in another Subnet without going through a router which can monitor the traffic and block the packets of necessary. Think of a scenario in which there is only one network for an entire LAN. Once malicious users gain access to the network, they can scan the whole network and obtain the details of all the hosts in it. Therefore, splitting a network into multiple sections is one of the best network security practices. Creating Subnets or Subnetting occurs at the network layer which provides IP addresses. Therefore, we use IP addresses to define a Subnet. An IP Address consists of three parts, Network ID, Subnet ID and Host ID. Network ID is given to you by your Internet Service Provider or ISP. On a Google's Network ID is 64.233 which…
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