We live in a knowledge age. Businesses are more technologically advanced than ever before, and as technology progresses, so must organizations’ security postures. Network protection is becoming increasingly relevant as more devices connect over wired, wireless, or cellular networks. We’ll look at what network security is and what its main features are in this tutorial. [Read more…] about What is Network Security: An introduction to Network Security
The term variable-length subnet mask (VLSM) refers to the fact that a network can configure with different subnet mask. The basic idea behind VLSM is to offer more flexibility by dividing a network into multiple subnets while optimizing the allocation of varying amounts of host space between subnets. Without VLSM, only one subnet mask can apply to an entire network. It would restrict the number of hosts given the number of subnets required. If you select the subnet mask so that it has enough subnets, you might not be able to assign enough host numbers in each subnet. The same is true for hosts; A mask that allows enough hosts may not provide enough subnet space. VLSM provides the ability to assign subnets with varying numbers of hosts, allowing the network administrator to use the address space better. [Read more…] about What is Variable Length Subnet Mask (VLSM)? – Definition
The TCP / IP layer set corresponds to the OSI reference model levels as follows: [Read more…] about What is the difference between TCP/IP and OSI model?
The word network protocol designates a set of rules or conventions to carry out a particular task. In data transmission, the network protocol is used in a less broad sense to indicate the set of rules or specifications that are used to implement one or more levels of the OSI model. [Read more…] about What are Network Protocols? – Definition
UnGuided or also called wireless or wireless communication, transport electromagnetic waves without using a physical conductor. Instead, signals are radiated through the air (or, in a few cases, water) and therefore, are available to anyone with a device capable of accepting them. [Read more…] about UnBounded/UnGuided Transmission Media in Computer Networks
Guided means are those that provide a conductor from one device to the other and include twisted-pair cables, coaxial cables, and fiber optic cables. A signal traveling by any of these means is directed and contained by the physical limits of the medium. Twisted pair and coaxial cable use metallic (copper) conductors that accept and carry electrical current signals. Fiber optic is a glass or plastic cable that accepts and transports signals in the form of light. [Read more…] about Guided Transmission Media in Computer Networks
A network is a set of computers connected through a transmission medium, to transmit and receive information from other computers in the network. You can also define a network as a set of devices (often called nodes) connected by links from a physical medium. A node can be a computer, a printer, or any other device capable of sending and receiving data generated by other nodes of the network. The links connected to the devices, often referred to as communication channels. [Read more…] about What is a Communication Network? Network Effectiveness Criteria
FDDI stands for Fiber Distributed Data Interface. It is a high-speed, high-bandwidth network based on optical transmissions. It is most often used as a network backbone, for connecting high-end computers (mainframes, minicomputers, and peripherals), and for LANs connecting high-performance engineering, graphics, and other workstations that demand a rapid transfer of large amounts of data. It can transport data at a rate of 100 Megabits per second and can support up to 500 stations on a single network. FDDI was designed to run through fiber cables, transmitting light pulses to convey information between stations, but it can also run on copper using electrical signals. It is relatively expensive to implement, although the mixing of fiber-optic with copper cabling can hold down the cost. [Read more…] about What is a Fiber Distributed Data Interface (FDDI)? – Definition
Digital Equipment Corporation (DEC) has given support to network connectivity for networks of its own and networks of other vendors also. DEC has its own architecture known as Digital Network Architecture (DNA) the product that implements the architecture is known as DEC net. The DNA was developed during 1974, to provide communication facility between various DEC systems. [Read more…] about What is the Cisco Digital Network Architecture?
The Systems Network Architecture (SNA) from IBM uses a 7 layer architecture similar to the OSI model. [Read more…] about What is SNA (System Network Architecture)?
In general, a computer network composed of one or more servers, workstations, network interface cards, active and passive hub, routers, bridges, gateways, modem, software components like network operating systems, and other application software. The following components widely used for the construction of networks. [Read more…] about Computer Network Components
A computer network can be classified into different categories. Different criteria are used to classify computer networks. Following are the criteria widely used. [Read more…] about Classification of Computer Networks
The access point (abbreviated AP or WAP (for wireless access point)), is a networking hardware device, such as a wireless router, that transmits and receives data (sometimes referred to as a transceiver) and also can serve as the bridge between the WAP device and a wired LAN (Local Area Network), which facilitates connectivity between nearby wireless clients. A WAP (also known as a hotspot) acts as a central transmitter and receiver of wireless radio signals. [Read more…] about What is a Wireless Access Point (WAP)? – Advantages and Disadvantages
Definition: Storage area network is abbreviated as SAN. SAN is a network which is designed to attach computer storage devices such as disk array controllers and tape libraries to servers. SAN network can be accessed by multiple computers. It is a secure and high-speed data network. It is also known as SAN storage, SAN network, etc. [Read more…] about What is a Storage Area Network (SAN)? – Definition
Long-term Evolution abbreviated as LTE. We make use of LTE to refer to wireless broadband and other mobile network technologies. LTE standard was developed by the 3GPP (3rd Generation Partnership Project) in 2004. [Read more…] about What is LTE (Long Term Evolution)?
Definition: General Packet Radio Service is a packet-based wireless communication service. It promises data rate up to 114 kbps. It is a standard technology which extends the Global system. It abbreviated as GPRS. It is designed to replace the current circuit-switched services. [Read more…] about What is General Packet Radio Service (GPRS)?
Cluster computing or High-Performance computing frameworks is a form of computing in which bunch of computers (often called nodes) that are connected through a LAN (local area network) so that, they behave like a single machine. A computer cluster help to solve complex operations more efficiently with much faster processing speed, better data integrity than a single computer and they only used for mission-critical applications. [Read more…] about What is Cluster Computing? – Definition
Data Communication or Network Communication: It is the process of transporting data or information from one device to another.The channel or physical connection (path) through which the information is carried from sender(Source or origin) to the receiver(destination) is established using either cable (Physical media) or wireless media. The physical cable like twisted pair wire, coaxial cable, fiber-optic cable or wireless media like laser, radio waves, and microwaves. [Read more…] about What is the difference between computer networks and network communications?
A FQDN consists of a host, a second-level domain and top-level domain.
For example, www.ecomputernotes.com is a FQDN. www is the host; area is the tertiary sector; ecomputernotes is the second level domain is .com is the top field.
A CNAME is simply an alias for a host record. The CNAMEs allow you to have more than one DNS name for each host record. The CNAME points to the parameter A. So if you change your IP address in the parameter A, all your CNAME records follow the new IP address of the parameter A. [Read more…] about What is a CNAME?