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Found 825 Articles for Network
![Ajay yadav](https://www.tutorialspoint.com/assets/profiles/152707/profile/60_183870-1577075932.jpg)
70K+ Views
Nmap is a free open source tool, employed to discover hosts and services on a computer network by sending packets and analyzing the retrieved responses. Nmap offers some features for probing computer networks, including host discovery and service and operating system detection.Nmap can provide further information on targets, including reverse DNS names, device types, and MAC addresses.Host discovery – Identifying hosts on a network. For example, listing the hosts that respond to TCP and/or ICMP requests or have a particular port open.Port scanning – Enumerating the open ports on target hosts.OS detection – Determining the operating system and hardware characteristics ... Read More
![Ajay yadav](https://www.tutorialspoint.com/assets/profiles/152707/profile/60_183870-1577075932.jpg)
204 Views
If we think an advance level of anti-virus has been installed on our computer, and we are fully secure as it performs a full system threat infection scan regularly. However, there may be instances where the scan did not detect any threat, or you cannot perform a scan. In these scenarios, we recommend that to notice the aggressive methods or symptoms to detect threats or attack.If it has been noticed an unwarranted presence of PowerShell in the task manager then our computer is definitely under attack.If a connection found to be established on port 4444 or 445 without your cognizance ... Read More
![Pradeep Elance](https://www.tutorialspoint.com/assets/profiles/121076/profile/60_44312-1565945237.jpg)
812 Views
In a computer network, the network service runs a software in each of the computers that are part of the network. In Linux System this network software uses a protocol called TCP or UDP along with port number. TCP is known as transmission control protocol and UDP is known as user datagram protocol. In this article we will see how to watch the ports are sockets which are running on this protocols on a real time basis.List of Open PortsAs a first step we look for the open ports that are available in the system. Bye open we mean the ... Read More
![Moumita](https://www.tutorialspoint.com/assets/profiles/13507/profile/60_122499-1557898491.jpg)
509 Views
Orthogonal frequency division multiple access (OFDMA) is a multi-user version of digital data modulation scheme OFDM (orthogonal frequency division multiplexing). In OFDM, a single stream of data is divided into several separate sub-streams for transmission via multiple channels. OFDM uses the principle of frequency division multiplexing (FDM), where the available bandwidth is divided into a set of sub-streams having separate frequency bands.In OFDMA, multiple access is achieved by assignment of different subsets of subcarriers to individual stations. This permits transmission to go on simultaneously at lower data rate from several stations.The stations assigned to a given subcarrier alternate between sending ... Read More
![Moumita](https://www.tutorialspoint.com/assets/profiles/13507/profile/60_122499-1557898491.jpg)
2K+ Views
The IEEE 802.16 is a set of standards that lays down the specifications for wireless broadband technology. It has been commercialized as Worldwide Interoperability for Microwave Access (WiMAX) that is responsible for delivery of last mile wireless broadband access. It lays down the standards for both physical layer as well as medium access control (MAC) layer for WiMAX.Physical Layer Features of WiMAXThere are two popular services of the physical layer −Fixed WiMAX.Mobile WiMAX.WiMAX initially provided data rates of 30 – 40 Mbps. The updated version that came in 2011 provides up to 1 Gbps data rates for fixed stations.It operates ... Read More
![Moumita](https://www.tutorialspoint.com/assets/profiles/13507/profile/60_122499-1557898491.jpg)
2K+ Views
The IEEE 802.16 set of standards lays down the specifications for wireless broadband technology. It has been commercialized as Worldwide Interoperability for Microwave Access (WiMAX) and is responsible for delivery of last mile wireless broadband access.The IEEE 802.16 lays down the standards for both physical layer as well as medium access control (MAC) layer for WiMAX. The general structure of the IEEE protocol stack is shown as below −As shown in the diagram, IEEE 802.16 lays down the standards for physical layer and data link layer.Physical Layer − The two popular services of the physical layer are fixed WiMAX and ... Read More
![Moumita](https://www.tutorialspoint.com/assets/profiles/13507/profile/60_122499-1557898491.jpg)
5K+ Views
The IEEE 802.16 is a set of standards that lays down the specifications for wireless broadband technology. It has been commercialized as Worldwide Interoperability for Microwave Access (WiMAX) that is responsible for delivery of last mile wireless broadband access.The IEEE 802.16 architecture lays down the standards for both physical layer as well as medium access control (MAC) layer for WiMAX. It initially provided data rates of 30 – 40 Mbps. The updated version that came in 2011 provides up to 1 Gbps data rates for fixed stations. It operates in the frequency band of 2 GHz to 11 GHz. The ... Read More
![Moumita](https://www.tutorialspoint.com/assets/profiles/13507/profile/60_122499-1557898491.jpg)
3K+ Views
The 802.16 is a set of standards defined by IEEE (Institute of Electrical and Electronics Engineers) that lays down the specifications for wireless broadband technology. It has been commercialized as Worldwide Interoperability for Microwave Access (WiMAX) that is responsible for delivery of last mile wireless broadband access.The IEEE 802.16 lays down the standards for both physical layer as well as medium access control (MAC) layer for WiMAX. It initially provided data rates of 30 – 40 Mbps. The updated version that came in 2011 provides up to 1 Gbps data rates for fixed stations. It operates in the frequency band ... Read More
![Sharon Christine](https://www.tutorialspoint.com/assets/profiles/13517/profile/60_82215-1512649681.jpg)
4K+ Views
This article will help to know how to configure an NTP (Network Time Protocol) server and client on RHEL/Cent OS Linux to manage the system clock with to help of an NTP server.NTP (Network Time Protocol)NPT is used to synchronize a computer’s machine’s time with another time source. In RHEL / CentOS Linux we can use NTP or OpenNTPD server, which provides client and server software for time synchronization.Installing NTP SoftwareThe NTP package have utilities and daemons that will synchronize the machine time to Coordinated Universal Time (UTC) via the NTP protocol. The NTP package has ntpdate (Which updates the ... Read More
![Sharon Christine](https://www.tutorialspoint.com/assets/profiles/13517/profile/60_82215-1512649681.jpg)
130 Views
Sysdig is an open source application, It captures system state and activity from a running Linux instance, then saves, filters and analyzes. It is scriptable in Lua and consists of a command line interface and an effective interactive UI, Sysdig is a combination of strace + tcpdump + htop + iftop + lsof + transaction tracing + awesome sauce. This article explains about -“How To Monitor Your Ubuntu System with Sysdig”.Installing SysdigConfigure the apt repository with trusted Draios GPG key as shown below –# curl -s https://s3.amazonaws.com/download.draios.com/DRAIOS-GPG-KEY.public | apt-key add - # curl -s -o /etc/apt/sources.list.d/draios.list http://download.draios.com/stable/deb/draios.listTo update the package ... Read More