Basics of NS2 and Otcltcl script

Satish Kumar
Updated on 06-Feb-2023 21:05:26
NS2 (Network Simulator version 2) is a discrete event network simulator that is widely used to simulate and analyze the behavior of computer networks. It is open-source software and is written in C++ and Otcl (Object-oriented Tool Command Language). The Otcl (Object-oriented Tool Command Language) is an extension of Tcl (Tool Command Language) and is used to create and control network entities and configure network scenarios in NS2. NS2 has two parts: the C++ part, which provides the underlying simulation engine, and the Otcl part, which provides the user interface and interaction between the user and the C++ part. The ... Read More

Basic Network Attacks in Computer Network

Satish Kumar
Updated on 06-Feb-2023 21:04:15
A network attack is any attempt to disrupt, compromise or gain unauthorized access to a computer network or its resources. Network attacks can be classified into several categories, depending on the method used, the target and the intent of the attacker. One way to classify network attacks is by their intent. Some attacks are designed to disrupt the normal operation of a network or its resources, while others are designed to steal sensitive information or take control of network resources. Another way to classify network attacks is by the method used. Some attacks involve exploiting known vulnerabilities in network software ... Read More

Basic Frame Structure of SDLC

Satish Kumar
Updated on 06-Feb-2023 21:03:28
The SDLC, or Software Development Life Cycle, is a process used by organizations to plan, design, build, test, and deploy software. The SDLC provides a framework for managing the entire software development process, and it typically consists of several distinct phases. The basic frame structure of the SDLC is as follows − Planning − This phase involves defining the project scope, objectives, and requirements. It also includes identifying stakeholders, analyzing the business case, and creating a project plan. Analysis − In this phase, the requirements are gathered and the system is analyzed in order to create a detailed design ... Read More

Basic configuration of Adaptive Security Appliance (ASA)

Satish Kumar
Updated on 06-Feb-2023 21:00:57
The Cisco Adaptive Security Appliance (ASA) is a security device that combines firewall, antivirus, intrusion prevention, and virtual private network (VPN) capabilities. The basic configuration of an ASA involves setting up basic networking, defining security policies, and configuring any desired VPN connections. Basic networking − Before configuring the ASA, you should make sure that the device has a valid IP address, subnet mask, and default gateway. You can configure these settings using the device's command-line interface (CLI). Security policies − The ASA uses access control lists (ACLs) to define security policies that control traffic flow. You can use the CLI ... Read More

Basic concept of TCP-Vegas

Satish Kumar
Updated on 06-Feb-2023 20:59:41
TCP Vegas is a variation of the Transmission Control Protocol (TCP) congestion control algorithm that aims to improve network performance by more accurately detecting and responding to network congestion. In standard TCP, the sender uses the number of packets that have been acknowledged by the receiver (the "congestion window") to control the rate at which it sends data. If the congestion window is large, the sender can send data more quickly, and if the congestion window is small, the sender sends data more slowly. However, this approach can be prone to errors, because the sender may not always accurately detect ... Read More

Bandwidth Allocation Protocol (BAP)

Satish Kumar
Updated on 06-Feb-2023 20:58:41
Bandwidth Allocation Protocol (BAP) is a protocol used to dynamically allocate bandwidth to different devices or applications on a network. The goal of BAP is to ensure that network resources are used efficiently, and that high-priority traffic, such as time-sensitive applications or real-time video, receives the bandwidth it needs to function properly. BAP can be implemented in several different ways, depending on the needs of the network and the devices that are connected to it. One common approach is to use Quality of Service (QoS) marking and prioritization to ensure that high-priority traffic receives priority over lower-priority traffic. This can ... Read More

Bandwidth Allocation Control Protocol (BACP)

Satish Kumar
Updated on 06-Feb-2023 20:57:19
Bandwidth Allocation Control Protocol (BACP) is a protocol used in Asynchronous Transfer Mode (ATM) networks to control the allocation of bandwidth among different virtual channels. It is used to ensure that bandwidth is allocated fairly among competing traffic streams, and to prevent any one traffic stream from monopolizing the network. BACP operates at the edge of the ATM network, in the ATM Adaptation Layer (AAL). When a virtual channel is established between two endpoints, BACP is used to negotiate the amount of bandwidth that will be allocated to that channel. BACP also monitors the usage of the channel, and adjusts ... Read More

Backing up Cisco IOS Router image

Satish Kumar
Updated on 06-Feb-2023 20:56:05
A Cisco IOS (Internetwork Operating System) image is a type of software that runs on a Cisco router. It contains the necessary system files and utilities to allow the router to function as a network device, such as routing protocols, management tools, and security features. Backing up Cisco IOS Router image Backing up the Cisco IOS image on a router is an important step in the event that the current image becomes corrupt or is accidentally deleted. It is always recommended to have a backup copy of the Cisco IOS image before making any changes to the router, such as ... Read More

Avalanche Effect in Cryptography

Satish Kumar
Updated on 06-Feb-2023 20:55:11
The avalanche effect in cryptography refers to the phenomenon where a small change in the input of a cryptographic function, such as a hash function, results in a significant and seemingly unrelated change in the output. This property is desirable in cryptographic functions because it makes it difficult for an attacker to predict the output of the function based on partial knowledge of the input. For example, consider a hash function that takes an input string and produces a fixed-size output. If the avalanche effect is strong, then making a small change to the input string, such as changing a ... Read More

Availability in Information Security

Satish Kumar
Updated on 06-Feb-2023 20:53:15
Availability in information security refers to the ability of authorized users to access and use data and systems as intended. Ensuring availability is an important aspect of information security because it ensures that users can access the resources they need to complete their work and maintain the operations of an organization. Threats to availability include things like network outages, hardware failures, and cyber attacks that disrupt access to systems or data. To ensure availability, organizations often implement measures such as redundant systems, backup and recovery processes, and incident response plans. Why availability is important Availability is an important aspect of ... Read More
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