Firewall
Delhi Police Exam
Understanding firewalls is crucial for both the Delhi Police exam and real-world cybersecurity. This topic frequently appears in computer awareness sections with questions on definition, types, and functions.
1. What is a Firewall?
A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
📝 Exam-Focused Definition:
"A firewall acts as a barrier between a trusted network and an untrusted network (like the internet) to prevent unauthorized access."
Purpose:
- Block unauthorized access
- Allow safe communication
- Prevent malware and hackers from entering the system
💡 Simple Trick:
"Think of a firewall as a 'security guard' for your computer or network."
2️. Types of Firewalls
| Type | Description | Example / Use |
|---|---|---|
| Hardware Firewall | Physical device between network & internet | Routers with built-in firewall |
| Software Firewall | Installed on computer to monitor traffic | Windows Firewall, ZoneAlarm |
| Packet Filtering Firewall | Checks each data packet | Simple & fast, basic security |
| Proxy Firewall | Acts as an intermediary | Filters requests, hides IP |
| Next-Generation Firewall (NGFW) | Advanced, includes malware detection & application control | Enterprise networks |
Exam Trick: Remember HW = Physical, SW = Software, NGFW = Smart & New Generation.
3️. Functions of a Firewall
Traffic Filtering
Blocks suspicious data packets
Access Control
Permits only authorized users
Monitoring & Logging
Keeps record of all network activities
Protection against Malware
Prevents viruses, worms, ransomware from spreading
4️. Delhi Police PYQ Style Questions
A firewall is used to:
Options: (a) Edit documents (b) Protect network from unauthorized access (c) Increase RAM (d) Speed up CPU
Category: Firewall Purpose
Show Answer
Protect network from unauthorized access
Which of the following is a software firewall?
Options: (a) Windows Firewall (b) Cisco Hardware Firewall (c) Router (d) Switch
Category: Firewall Types
Show Answer
Windows Firewall
Which type of firewall filters each data packet individually?
Options: (a) Proxy (b) Packet Filtering (c) Next-Generation (d) Hardware
Category: Firewall Types
Show Answer
Packet Filtering
Next-Generation Firewall (NGFW) includes which extra feature?
Options: (a) Printing (b) Malware detection & Application control (c) Disk cleanup (d) File compression
Category: Advanced Firewalls
Show Answer
Malware detection & Application control
A firewall acts as a:
Options: (a) Network barrier (b) Virus (c) Cloud storage (d) Email client
Category: Firewall Function
Show Answer
Network barrier
Short Answer Task
Question:
Explain in 50 words the purpose of a firewall and list two types commonly used in home computers.
Answer Guidelines:
Use keywords like software firewall, hardware firewall, network protection
Make your answer concise — around 50 words as specified
Sample Answer Structure:
A firewall is a network security system that monitors and controls incoming/outgoing traffic based on security rules. Its purpose is to block unauthorized access while allowing safe communication. Two common types used in home computers are software firewalls (like Windows Firewall) and hardware firewalls (built into routers).
5️. Quick Recap / Memory Tricks
| Feature | Trick to Remember |
|---|---|
| Firewall | "Security guard of network" |
| Hardware Firewall | Physical device at network entry |
| Software Firewall | Installed on PC, monitors traffic |
| NGFW | Smart firewall with malware detection |
Exam Tip: Delhi Police often asks definition + main types. Memorizing 3–4 types and purpose covers most PYQs.
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