Firewall, IDS, IPS concepts

-

 

🔥 Firewall, IDS, IPS Concepts

These are essential network security technologies used to protect systems from cyber attacks.

🛡️ 1️⃣ Firewall

📘 What is a Firewall?

A Firewall is a network security device (hardware or software) that monitors and controls incoming and outgoing network traffic based on predefined security rules.

It acts as a barrier between trusted and untrusted networks.

🎯 Purpose

  • Block unauthorized access

  • Allow legitimate traffic

  • Protect internal network

  • Prevent external attacks

⚙️ How Firewall Works

Firewall checks:

  • IP address

  • Port number

  • Protocol (TCP/UDP)

  • Packet contents (advanced firewalls)

If traffic matches allowed rules → permitted
If not → blocked

📊 Types of Firewalls

1️⃣ Packet Filtering Firewall

  • Basic filtering

  • Checks IP and port

  • Fast but less secure

2️⃣ Stateful Inspection Firewall

  • Tracks active connections

  • More secure than packet filtering

3️⃣ Proxy Firewall

  • Acts as intermediary

  • Hides internal IP addresses

4️⃣ Next-Generation Firewall (NGFW)

  • Deep packet inspection

  • Application-level filtering

  • Intrusion prevention

  • Malware protection

🔥 Advantages

  • First line of defense

  • Easy to configure

  • Protects entire network

⚠ Limitations

  • Cannot detect internal threats

  • Cannot stop social engineering

  • Limited against advanced attacks

🕵️ 2️⃣ IDS (Intrusion Detection System)

📘 What is IDS?

An Intrusion Detection System (IDS) is a security system that monitors network or system activities and detects suspicious or malicious behavior.

It only detects and alerts — it does NOT block attacks.

🎯 Purpose

  • Identify potential attacks

  • Alert administrators

  • Monitor network traffic

📊 Types of IDS

1️⃣ Network-Based IDS (NIDS)

Monitors entire network traffic.

2️⃣ Host-Based IDS (HIDS)

Installed on individual systems.

🔎 Detection Methods

🔹 Signature-Based Detection

Detects known attack patterns.

🔹 Anomaly-Based Detection

Detects unusual behavior.

🛑 Limitation

  • Cannot block attacks

  • May generate false positives

🚫 3️⃣ IPS (Intrusion Prevention System)

📘 What is IPS?

An Intrusion Prevention System (IPS) is an advanced security system that detects and automatically blocks malicious traffic.

It is an upgraded version of IDS.

🎯 Purpose

  • Detect attacks

  • Block malicious traffic

  • Prevent network intrusion

⚙️ How IPS Works

IPS:

  1. Monitors network traffic

  2. Analyzes data packets

  3. Detects suspicious activity

  4. Automatically blocks or drops malicious packets

📊 Types of IPS

1️⃣ Network IPS (NIPS)

Protects entire network.

2️⃣ Host IPS (HIPS)

Protects individual system.

🔥 Advantages

  • Real-time protection

  • Automatic response

  • Prevents zero-day exploits (with anomaly detection)

📊 Firewall vs IDS vs IPS Comparison

FeatureFirewallIDSIPS
Filters trafficYesNoYes
Detects attacksLimitedYesYes
Blocks attacksYesNoYes
Generates alertsLimitedYesYes
Automatic preventionBasicNoYes

🔄 How They Work Together

Best security setup:

Internet → Firewall → IPS → Internal Network
IDS monitors traffic and alerts administrators.

Layered security = Strong protection.

🎓 Short Exam Definition

A Firewall controls network traffic based on security rules, an IDS detects suspicious activity and alerts administrators, and an IPS detects and automatically blocks malicious traffic to prevent attacks.

🔥 Important Keywords

  • Packet Filtering

  • Stateful Inspection

  • Deep Packet Inspection

  • Signature-Based Detection

  • Anomaly Detection

  • Network Monitoring

  • Intrusion Prevention

Comments

Post a Comment

Popular posts from this blog

Introduction to Computer

-
Image
Computers are electronic devices that are designed to process, store, and retrieve data. They are used for a wide variety of purposes, from personal computing to complex scientific simulations and industrial automation. A computer consists of various hardware components, including a central processing unit (CPU), memory, storage devices, input/output (I/O) devices such as keyboards, mice, and displays, and various other peripherals. Computers communicate with each other over networks, which are interconnected groups of computers that share resources and information. The internet is a global network that connects millions of computers around the world and enables communication and information sharing on an unprecedented scale. The field of computer science is concerned with the study of computers and computational systems, including their design, development, and application. It encompasses many subfields, including artificial intelligence, computer graphics, databases, programming lang...
Read more

History of Computer

-
Image
  History of Computer Topics  Definition of computer  Earliest computer  Computer History  Computer Generations Definition of Computer  Computer is a programmable machine.  Computer is a machine that manipulates data according to a list of instructions.  Computer is any device which aids humans in performing various kinds of computations or calculations.  Definition of Computer Three principles characteristic of computer:  It responds to a specific set of instructions in a well-defined manner.  It can execute a pre-recorded list of instructions.  It can quickly store and retrieve large amounts of data.  Earliest Computer  Originally calculations were computed by humans, whose job title was computers.  These human computers were typically engaged in the calculation of a mathematical expression.  The calculations of this period were specialized and expensive, requiring years of training in mathematics.  T...
Read more

Computer Generation

-
Image
 There are five generations of computer:  First generation– 1946 - 1958  Second generation– 1959 - 1964  Third generation– 1965 - 1970  Fourth generation– 1971 - today  Fifth generation– Today to future The First Generation   The first computers used vacuum tubes for circuitry and magnetic drums for memory, and were often enormous, taking up entire rooms.  They were very expensive to operate and in addition to using a great deal of electricity, generated a lot of heat, which was often the cause of malfunctions. The Second Generation   Transistors replaced vacuum tubes and ushered in the second generation of computers.  One transistor replaced the equivalent of 40 vacuum tubes.    Allowing computers to become smaller, faster, cheaper, more energy-efficient and more reliable.  Still generated a great deal of heat that can damage the computer. The Third Generation  The development of the integrated circuit was ...
Read more