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MCA Articles
Page 60 of 95
What are issues in congestion and Flow control in LANs?
Let us understand the concept of flow control and congestion control in LANs and the key issues that arise with each approach. Flow Control Flow control is handled by the receiving side and ensures that a sender transmits data only at a rate that the receiver can process and handle effectively. Flow control provides a mechanism to ensure that communication flows smoothly between sender and receiver. For example, if a sender has a high-speed fiber connection but the receiver is on a slower dial-up connection, the sender must throttle its transmission rate to match the receiver's capacity. ...
Read MoreWhat are security issues in IP protocol?
There are three major security vulnerabilities that affect the IP protocol in network communications. These security issues arise because IP was originally designed for a trusted network environment and lacks built-in security mechanisms. Packet Sniffing Packet Modification IP Spoofing Let us examine each security issue and understand how they can compromise network communications. Packet Sniffing Packet sniffing occurs when an unauthorized party intercepts and copies IP packets as they traverse the network. This is typically a passive attack where the attacker simply observes network traffic without altering it. The primary danger of packet ...
Read MoreWhat are the types of ICMP message types?
Internet Control Message Protocol (ICMP) is a network layer protocol that reports errors and provides diagnostic information about network connectivity issues. ICMP messages are categorized into specific types, each identified by a unique type number and accompanied by detailed codes. ICMP message types are divided into two main categories: Error Reporting Messages − Notify about network errors and problems Query Messages − Request and provide network status information ICMP Message Types Error Reporting ...
Read MoreDifferentiate between piconet and scatternet
Let us understand the concept of piconet and scatternet before learning the differences between them. Piconet A piconet is a network created by connecting multiple wireless devices using Bluetooth technology. In a piconet network, one master device exists that can connect to up to 7 slave devices, forming a network of maximum 8 devices total. The master device controls communication and coordinates access to the shared radio channel. Due to the limited number of active devices, channel bandwidth utilization is conservative but sufficient for short-range applications. Piconet Structure ...
Read MoreWhat are the different types of ISDN?
ISDN (Integrated Services Digital Network) is a telephone switched network that integrates voice and data transmission over digital lines simultaneously. It provides both circuit-switched and packet-switched network services, enabling multiple types of communication over a single connection. ISDN supports a comprehensive range of services including voice calls, video calls, electronic mail, database access, facsimile transmission, data transfer, internet connectivity, electronic fund transfer, and audio/video conferencing. ISDN Network Architecture User Equipment NT1 ...
Read MoreWhat is DSL technology and differentiate between DSL modem and DSLAM?
Digital Subscriber Line (DSL) is a technology that transmits digital data over traditional copper telephone lines. DSL enables high-speed internet access by utilizing higher frequency ranges of the telephone line, allowing simultaneous voice and data transmission without interference. Unlike dial-up connections that monopolize the phone line, DSL technology uses frequency division to separate voice calls (low frequencies) and internet data (higher frequencies). This allows users to make phone calls while browsing the internet simultaneously. How DSL Works DSL operates by splitting the available bandwidth on copper telephone wires into different frequency ranges. Voice communication uses frequencies below ...
Read MoreWhat is CIDR and how it works?
Classless Inter-Domain Routing (CIDR) is a method for allocating IP addresses and routing internet traffic more efficiently than the traditional classful addressing system. CIDR allows network administrators to create custom-sized networks by specifying exactly how many bits are used for the network portion of an IP address. Unlike classful addressing (Class A, B, C), CIDR eliminates the rigid boundaries of predefined address classes, enabling more flexible and efficient use of IP address space. This approach significantly reduces IP address wastage by allocating only the exact number of addresses needed. How CIDR Works CIDR uses slash notation to ...
Read MoreWhat is BGP and why do we need it?
BGP (Border Gateway Protocol) is a standardized exterior gateway protocol designed to exchange routing and reachability information between different autonomous systems (AS) on the Internet. It is classified as a path vector protocol, making routing decisions based on paths, network policies, and rule sets configured by network administrators. BGP is essential for Internet connectivity, as it enables different networks owned by various organizations to communicate and share routing information effectively. BGP: Connecting Autonomous Systems AS 100 ISP A R1 ...
Read MoreWhat is QOS and mobile and network QOS?
Let us understand the concept of Quality of Service (QoS) in networking and mobile communications. QoS in Networking Quality of Service (QoS) in networking refers to the ability of a network to provide reliable and predictable service levels to different types of traffic across various technologies including Ethernet, wireless, IP, and Asynchronous Transfer Mode. During network congestion, QoS mechanisms must account for various factors that cause performance degradation, such as limited bandwidth, high traffic on specific routes, or inefficient resource allocation. The routing protocol heavily impacts network QoS by determining how efficiently traffic is distributed across available ...
Read MoreWhat are security threats? Differentiate between wired and wireless threats
Security threats are potential risks and vulnerabilities that can compromise the confidentiality, integrity, and availability of computer systems and networks. These threats can originate from various sources and target different aspects of digital infrastructure. Common Security Threats Hardware threats − Physical damage, theft, or unauthorized access to computing equipment that can lead to data breaches or system failures. Software threats − Malicious programs, viruses, and vulnerabilities in applications that can corrupt or steal critical organizational data. Hacking − Unauthorized access to systems through exploitation of security vulnerabilities, often involving malicious programs to ...
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