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OSPF (Open Shortest Path First) and IGRP (Interior Gateway Routing Protocol) are two different routing protocols used in computer networks to determine the best paths for data transmission. Understanding their differences is crucial for network administrators when designing and implementing routing solutions. OSPF OSPF stands for Open Shortest Path First, which uses a link-state routing algorithm. It builds network topology using link-state information available in the router, then discovers the routing table for making forwarding decisions. OSPF supports both variable-length subnet masking (VLSM) and classless inter-domain routing (CIDR). As it uses Dijkstra's algorithm, it calculates the shortest ... Read More
VSAT (Very Small Aperture Terminal) is a two-way, low-cost ground microstation for transmitting data to and from communication satellites. A VSAT has a dish antenna with diameters between 75 cm to 1.2 meters, which is very small compared to the 10+ meter diameter antennas used in traditional satellite earth stations. VSATs access satellites in geostationary orbits (GEO) positioned approximately 36, 000 kilometers above the Earth's equator. Data transmission rates in VSAT networks typically range from 4 Kbps to 16 Mbps, making them suitable for various applications from simple data transactions to broadband internet access. ... Read More
In this article, we will show you how to set up multiple SSL certificates on a CentOS server with Apache using a single IP address. Traditionally, website administrators were restricted to using one SSL certificate per IP address, which required purchasing multiple IP addresses for HTTPS websites or additional hardware with multiple network adapters. This limitation is overcome by an extension to the SSL protocol called Server Name Indication (SNI). Most modern desktop and mobile web browsers support SNI, allowing you to secure multiple websites without purchasing additional IP addresses. Multiple SSL Certificates with ... Read More
General Packet Radio Service (GPRS) is a packet-switched data service that extends GSM (Global System for Mobile Communications) architecture to provide enhanced data transmission capabilities. While GSM uses circuit-switched technology for voice calls, GPRS introduces packet-switched services for efficient data communication. GPRS revolutionized mobile data communication by allowing multiple users to share the same radio resources simultaneously, achieving data rates from 9.6 to 171 kbps compared to GSM's 14.4 kbps circuit-switched data service. GPRS vs GSM Comparison Feature GSM GPRS Switching Method Circuit-switched Packet-switched Data Rate 14.4 kbps ... Read More
Amazon Drive is a cloud storage service launched by Amazon in 2011. It provides a secure cloud infrastructure built on AWS (Amazon Web Services), leveraging the same reliable D3 services used by many cloud companies for data storage. Amazon Drive offers 5 GB of free storage that can be expanded through paid plans. The service is integrated into Amazon Fire TV and Amazon Video applications, providing seamless access across the Amazon ecosystem. Amazon Drive Features Cloud storage and file sharing − Store files securely and share them with others Photo printing services − ... Read More
The two most popular wireless Internet access technologies are Wireless Local Area Network (WLAN) and Wide-area Wireless Access Network (WWAN). These technologies differ significantly in their coverage area, infrastructure, and use cases. WLAN (Wireless Local Area Network) WLAN uses locally placed radio transmitters called base stations or access points to provide Internet connectivity. End devices equipped with radio transceivers exchange data with these base stations to access network resources. Key Characteristics of WLAN Limited range − Coverage extends only a few tens of meters from the access point High-speed connectivity − Provides ... Read More
With rapid advancement of technology and growth of the internet, network security has become an increasingly important issue. Organizations and individuals alike are constantly at risk of cyber-attacks, and the consequences of a successful attack can be devastating. This article presents a comprehensive model for network security that organizations can implement to protect their networks. Network Security Model Perimeter Security Firewalls, IDS Access Control RBAC, Passwords Data Protection ... Read More
Wireless and mobile devices face numerous security threats due to their inherent connectivity and portability. Understanding these attack vectors is crucial for implementing effective security measures and protecting sensitive information from malicious actors. SMiShing (SMS Phishing) SMiShing uses Short Message Service (SMS) to deliver fraudulent text messages containing malicious links or requests for sensitive information. Attackers craft convincing messages that appear to come from legitimate sources like banks or service providers. Victims may unknowingly provide credit card numbers, account credentials, or personal information. Clicking malicious links can download malware onto the device, compromising security and potentially creating ... Read More
VLAN and VPN are two independent technologies in computer networking that serve different purposes. A Virtual Private Network (VPN) is a secure, encrypted connection established through a public network (such as the Internet) to connect remote users or networks to a private network. A Virtual Local Area Network (VLAN) is a logical network formed within a physical network infrastructure to segment devices into separate broadcast domains. VLAN vs VPN — Different Network Solutions VLAN Local Network Segmentation Layer 2 (Data ... Read More
The Internet of Things (IoT) is a network of interconnected, internet-connected objects that can gather and transmit data without the need for human interaction across a wireless network. In healthcare, IoT is revolutionizing patient care by enabling continuous monitoring, real-time data collection, and improved treatment outcomes. Kevin Ashton originated the term "internet of things" in 1999. The dot com boom was in full swing by the late 1990s, and academics like Neil Gershenfeld of the Massachusetts Institute of Technology (MIT) were coining phrases like "Things That Think" to characterize research into the use of sensors on common objects. ... Read More