Maximum Transmission Unit (MTU) is the measurement of largest data packet that can be sent on a network between systems. Units used for MTU measured is bytes. MTU is property of data link layer. Some Data Link technology’s MTU are given below for your reference. Technology MTU Ethernet 1500 Wi Fi 2304 PPPoE 1492
Author: kingsanit
OS Discovery
In the Scanning sub phase of the Reconnaissance phase blog, we covered that in this phase, we gather information about the target. In the scanning process, we identify the active IP addresses on the network and active ports/services on each system. The next step is to identify the OS running the system. This process is…
Network Security
An enterprise comprises systems and applications. The systems are interconnected through a network. The systems, applications and network (Intranet) combined together becomes an infrastructure. The infrastructure is connected to the Internet for various purposes. The Internet is un-secured huge public network and the enterprise network is private secured network. There should be line of control…
Scanning
Scanning is part of the Reconnaissance phase where the attacker gathers information about a target. It is type of active reconnaissance during which the network and systems are scanned. In the scanning, the live systems (IP addresses) are found and then the active ports on a system are identified. Post which, OS type (Windows, Unix,…
Reconnaissance
Reconnaissance is the phase in which an attacker gathers information of the target to be attacked. The target can be a person or a system or an infrastructure. The following are the sub phases of Reconnaissance:
OSI Layers
The Open Systems Interconnection (OSI) model is a reference model that was developed by International Organization for Standardization (ISO) providing standardization of communication between systems connected over a network. The model has seven layers which are application, presentation, session, transport, network, data link and physical. Splitting a logically into seven layers brings flexibility and adaptability…
Network Mapper (NMAP)
NMAP (Network Mapper) is a free and open source utility for network discovery and security auditing. It is used to scan network to live systems and ports/services on the systems which helps network admins, system admins to get inventory and build infrastructure (Network, Systems, Services) topology. Nmap can do the following scans: IP Sweep Scan – Scans…
Integrity
Integrity is making sure, that the data is intact without any changes. This can be achieved by hashing the data. When data is being received or processed, the hashes can be validated against the original hash to make sure, the data has not been compromised.
Confidentiality
Confidentiality is process of making sure that only authorized subject (person or entity) can access the data. This can be achieved by encrypting data, providing access to only authorized using authentication, privilege levels.
CIA Triad
CIA stands for Confidentiality, Integrity and Availability. Confidentiality is process of making sure that only authorized subject (person or entity) can access the data. This can be achieved by encrypting data, providing access to only authorized using authentication, privilege levels. Integrity is making sure, that the data is intact without any changes. This can be…