Computer Network Tutorial

Introduction of Computer Network Types of Computer Network Network Topology Computer Networking Architecture Transmission Modes (Data Flow) Basic Networking Devices Integrate Services Digital Network (ISDN)


OSI Model TCP/IP Model

Physical Layer

Digital Transmission Analog Transmission Transmission Media Switching

Data Link Layer

Error detection and Error correction Data Link Control Multiple Access Aloha

Network Layer

Network Layer - Logical Address Address Mapping Unicast Routing Protocol

Transport Layer

Process to Process Delivery User Datagram Protocol Transmission Control Protocol Stream Control Transmission Protocol Session Layer and Presentation Layer

Application Layer

Domain Name System Application Protocol E-mail Cryptography


Classes of Routing Protocols Classification of Routing Algorithms Controlled Access Protocols in Computer Networks Differences between IPv4 and IPv6 Fixed and Flooding Routing Algorithms Advantages and Disadvantages of Fibre Optics Cable APIPA Difference between Active and Passive FTP Fiber Optics and its Types Method of Joining and Fusion of Fiber Optic Cable Define Framing in Computer Network Disadvantages of Computer Network Mesh Topology Diagram in Computer Network Ring Topology in Computer Network Star Topology in Computer Networks 4G Mobile Communication Technology Advantages and Disadvantages of LAN Advantages and Disadvantages of MAN Advantages and Disadvantages of WAN Application Layer in OSI Model Cyclic Redundancy Check Example Data link layer in OSI model Difference between Transport and Network Layer Hamming Code Example Network Layer in OSI Model Session Layer in OSI Model Transport Layer in OSI Model Two Port Network in Computer Networks Uses of Computer Networks What is Computer Network What is Framing in a Computer Network Advantages and Disadvantages of Bus Topology Difference between Star Topology and Bus Topology Subnetting in Computer Network Subnetting Questions and Answers What is Bus Topology What is Network Topology and Types in Computer Networks Access Control in Networking Basic Characteristics of Computer Network Benefits of SOCKS5 Proxy in Computer Networks Computer Network viva Questions Difference between BOOTP and RARP Difference Between Network Topologies and Network Protocols Difference between NFC and RFID Difference Between Point-to-Point Link and star Topology Network Differences Between MSS and MTU Differences Between Trunk Port and Access Port Different Modes of Communication in Computer Networks MIME Protocol in Computer Networks Modes of Communication in Computer Networks Network Attack in Computer Network Port Address in Networking Simplest Protocol in Computer Network Sliding Window Protocol in Computer Network Stop And Wait Protocol in Computer Networks TCP 3-Way Handshake Process in Computer Networks What is a Proxy Server What is APPN What is ICMP Protocol What is Point-to-Point Protocol What is Port Address in Networking What is the HDLC Protocol What is VRRP Protocol Difference Between Analog and Digital Signals Difference Between Hub and Repeater Difference between Repeater and Switch Difference Between Transparent Bridge and Source Routing Bridge Source Routing Bridge in Computer Networks Transparent Bridge in Computer Networks Transport Protocol in Computer Networks Types of CSMA in Computer Networks What is Wired and Wireless Networking Network Security in Computer Network Disadvantages of Extranet Difference Between TELNET and FTP Define Protocol in Computer Networks Guided Transmission Media in Computer Network What is a Gateway in a Computer Network IGMP in Computer Networks LAN Protocols in Computer Networks MAN Meaning in Computer Modulation Techniques in Computer Networks Switching in DCN TCP/IP Applications What is IGMP? What is Modem in Networking What is Non-Persistent CSMA Difference between Cell Splitting and Cell Sectoring Forouzen Computer Network Open Loop and Closed Loop Congestion Control Types of Cluster Computing WAP-Wireless Access Point What are the elements of the Transport Protocol Difference between Gateway and Switch Flow Control in Data Link Layer Body Area Network Flooding in Computer Network Token Ring in Computer Networks VoIP in Computer Networks What is Infrared Transmission Congestion Control Techniques Forward Error Correction (FEC) Switching Techniques What is Telnet in Computer Network

Network Security in Computer Network

Network security is an essential aspect of computer networks aimed at protecting the confidentiality, integrity, and information and resources on the network. Several measures have been implemented to protect the network from unauthorized access, data breaches, malicious attacks, and other potential threats.

Here are some basic features and practices in network security:

  • Firewalls: These network security devices monitor incoming and outgoing traffic based on predefined security rules. They act as a barrier between the internal network infrastructure and the outside world, helping to prevent unauthorized access and isolate potentially malicious traffic.
  • Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS): IDS and IPS are security technologies that detect and respond to suspicious or malicious network activity and alert employees to potential security issues. At the same time, IPS goes a step further by that prevents these problems.
  • Virtual Private Networks (VPNs): VPNs establish secure, encrypted connections over untrusted networks such as the Internet. They allow remote users or branch offices secure access to the leading network and ensure data privacy and integrity.
  • Access Control: Implementing appropriate access controls is critical to network security. That includes defining a user role, authorization, and authentication mechanism to ensure that only authorized individuals can access specific resources and data within the network.
  • Encryption: Data encryption ensures that even if unauthorized users access network traffic or encrypted data, the information cannot be decrypted without a valid key.
  • Network Segmentation: Dividing the network into smaller blocks or subnets helps protect against potential security breaches, limits attacks, and prevents attackers from moving laterally.
  • Regular updates and patch management: It is essential to keep your network devices, operating systems, and software up-to-date with the latest security patches that fix known vulnerabilities and protect against potential exploits.
  • Strong Password Policy: Entering a firm password policy and multifactor authentication adds another layer of protection to prevent unauthorized access to critical network resources.
  • Security assessment and monitoring: Regular security assessment and regular monitoring of network operations help to identify potential vulnerabilities, suspicious behaviour, and security incidents and enable rapid response and improvement.
  • Employee training and awareness: Educating employees about security best practices and potential threats such as phishing attacks and social engineering helps prevent human error and improves overall network security.
  • Incident Response Plan: A well-defined incident response plan enables an organization to respond more effectively to security incidents, reduce waste and quickly restore normal operations.

Network security is an ongoing process that requires a combination of technical, systems, and user expertise to maintain robust protection against evolving threats in an ever-changing cybersecurity landscape. In computer networks, network security is essential in ensuring data and resources' security, privacy, and protection. By implementing a solid security measure through pre-regulations to regulate access roads and using cover violence and violence of other dignitaries for traffic and criticism, the internal sensitive system (IPS) thoroughly analyses and resolves potential and unauthorized entry.

Secure virtual private networks (VPNs) create encrypted communication channels that allow employees and partners to connect securely over long distances. Encryption algorithms protect sensitive information and make it impossible for unauthorized persons to decipher it. Network segmentation divides the network into isolated segments, which limits the spread of attacks and increases network resilience.

Regular updates and patch management are critical to addressing known vulnerabilities and strengthening network protection against potential exploits. Employee training and awareness programs promote a culture of safety awareness, thereby reducing people-related safety risks. Continuous monitoring and security audits identify emerging threats and ensure rapid response to security incidents. Effective incident management enables organizations to effectively address disruptions, minimize waste, and quickly restore normal operations. A comprehensive networking strategy is needed to protect networks from constant cyber threats.

Network security in computer networks is critical to protecting sensitive information and resources from unauthorized access and cyber threats. That includes implementing various features, such as a firewall that controls incoming and outgoing traffic based on pre-set rules. Intrusion detection systems (IDS) and intrusion prevention systems (IPS) monitor and respond to suspicious activity and potential attacks. Virtual Private Networks (VPNs) create secure connections over the Internet and ensure data privacy for remote users. Access control mechanisms only monitor access and authentication to limit access to authorized persons. An encryption protocol protects data during transmission and storage, making it unreadable without a valid decryption key. Network segmentation divides the network into smaller units and reduces the impact of disruptions where they occur. Continuous updates and patch management allow the system to cope with known vulnerabilities.

Network security is a critical component of modern computer networks, ensuring confidentiality, integrity, and availability of data and services. The rapid growth of connected systems and increasing trust in the Internet have made the need for robust network security measures more important than ever. This article examines the importance, threats, and vulnerabilities of network security common, and methods and technologies for securing computer networks.

Importance of Network Security

In today's connected world, networks facilitate the simple exchange of information and services. But this connectivity also exposes networks to a host of security risks. Network security is essential to protect sensitive data, intellectual property, and personal information from unauthorized access, alteration, or disclosure. It ensures the proper functioning of critical services, prevents data breaches, and protects against cyberattacks.

General Threats and Vulnerabilities

Malware: Malicious software such as viruses, worms, Trojans, and ransomware pose a severe threat to network security. Malware can reach websites via various vectors, such as email attachments, malicious websites, or infected software.

  • Phishing Attacks: Phishing is a social engineering technique that tricks users into revealing sensitive information, such as login credentials and financial data. These attacks typically take the form of fraudulent emails or web pages worth it.
  • Denial of Service (DoS) Attacks: DoS attacks flood a network or service with excess traffic, exceeding its resources and causing disruption or downtime. Distributed Denial of Service (DDoS) attacks exacerbate this threat by exploiting multiple compromised devices.
  • Man-in-the-Middle (MITM) attack: In a MITM attack, the attacker intercepts and can modify the communication between two parties, allowing them to eavesdrop or manipulate data.
  • Internal Threats: Project actors, such as employees or disgruntled employees, can seriously threaten network security through intentional or unintentional harm.

Network Security Management and Technology

  • Firewalls: Firewalls act as a first line of defence by monitoring and controlling incoming and outgoing network traffic based on predetermined security protocols. They can be hardware or software; it depends on it and helps prevent unauthorized access.
  • Intrusion Detection and Prevention System (IDPS): The IDPS solution analyses network traffic to identify suspicious activity or patterns. The administrators can be automatically blocked or alerted to a potential threat.
  • Encryption: Encryption is necessary to protect the confidentiality of data during transmission and storage. Secure communication protocols, such as SSL/TLS, ensure that data remains unreadable by unauthorized parties.
  • Virtual Private Networks (VPNs): VPNs are secure, encrypted routes over public networks, allowing users to access private resources while ensuring data confidentiality.
  • Security measures: Network administrators use security measures to restrict user privileges and access to sensitive information based on roles and permissions.
  • Patch management: It is essential to regularly update software and firmware with security patches to address known vulnerabilities and protect against emerging threats.
  • Authorization and Authorization: Robust authentication mechanisms such as multifactor authentication (MFA) verify user identity, while authorization mechanisms control what resources each user can access.
  • Network segmentation: Dividing the network into smaller units with limited communication between them helps contain breaches and limits the damage that can be done to a compromised system.
  • Security Assessment and Monitoring: Continuous security assessment and regular network activity monitoring help identify potential vulnerabilities and security incidents early.

Emerging Challenges in Network Security

  • Internet of Things (IoT): The proliferation of IoT devices has expanded the range of attacks, complicating the security of these devices with fewer features and different security standards.
  • Artificial Intelligence (AI) and Machine Learning (ML) in Cyber Attacks: Cyber attackers increasingly use AI and ML to automate attacks and circumvent traditional security measures.
  • Cloud security: Cloud computing presents unique security challenges, including data breaches, misconfiguration, and potential exposure of sensitive data.
  • Advanced Persistent Threats (APTs): APTs are sophisticated, persistent cyberattacks targeting specific organizations, often backed by well-funded adversaries such as nation-states.


Network security is essential in protecting computer networks from the ever-changing threat landscape. Network administrators can mitigate risk and ensure the resilience and security of their computing networks through robust processes and up-to-date technologies that are essential for organizations to remain vigilant as technology continues to acquire development and take proactive measures to protect their assets, data, and users.