Computer Networking for CRPF Radio Operator, Cipher, and Radio Fitter Entrance Exams

Computer Networking for CRPF Radio Operator : Computer networking is a critical skill for CRPF (Central Reserve Police Force) personnel, especially for roles like Radio Operators, Cipher Experts, and Radio Fitters. These roles require a deep understanding of how data is transmitted, secured, and managed across networks. Whether it’s setting up communication channels, encrypting sensitive information, or maintaining network equipment, a strong foundation in computer networking is essential.

This blog will guide you through the key networking concepts, technologies, and preparation strategies to help you excel in the CRPF entrance exams for these specialized roles.

Why is Computer Networking Important for CRPF Roles?

In the CRPF, effective communication is the backbone of successful operations. Radio Operators, Cipher Experts, and Radio Fitters are responsible for:

1. Establishing Communication Links: Ensuring seamless communication between teams in the field and command centers.
2. Securing Data: Encrypting and decrypting sensitive information to prevent unauthorized access.
3. Maintaining Equipment: Keeping networking and communication equipment in optimal condition.

A solid understanding of computer networking ensures that CRPF personnel can perform these tasks efficiently, even in challenging environments.

Key Topics to Focus On (Computer Networking for CRPF Radio Operator )

Here are the essential networking topics you need to master for the CRPF entrance exams:

1. Basics of Computer Networking

• Definition: A network is a collection of interconnected devices that communicate and share resources.
• Types of Networks: LAN (Local Area Network), WAN (Wide Area Network), MAN (Metropolitan Area Network), and PAN (Personal Area Network).
• Network Topologies: Star, bus, ring, mesh, and hybrid topologies.

2. OSI and TCP/IP Models

• OSI Model: The 7-layer model (Physical, Data Link, Network, Transport, Session, Presentation, Application).
• TCP/IP Model: The 4-layer model (Network Interface, Internet, Transport, Application).
• Comparison: Differences between OSI and TCP/IP models.

3. Network Devices

• Routers: Connect different networks and route data packets.
• Switches: Connect devices within a network and forward data based on MAC addresses.
• Hubs: Basic devices that broadcast data to all connected devices.
• Modems: Convert digital data to analog signals for transmission over telephone lines.

4. IP Addressing and Subnetting

• IPv4 and IPv6: Differences and uses.
• Subnetting: Dividing a network into smaller, manageable sub-networks.
• Private and Public IPs: Understanding their roles in networking.

5. Network Protocols

• HTTP/HTTPS: Protocols for web browsing.
• FTP: File Transfer Protocol for transferring files.
• SMTP/POP3/IMAP: Protocols for email communication.
• TCP and UDP: Transport layer protocols (TCP is connection-oriented, UDP is connectionless).

6. Wireless Networking

• Wi-Fi Standards: 802.11a, 802.11b, 802.11g, 802.11n, and 802.11ac.
• Bluetooth: Short-range wireless communication.
• Satellite Communication: Basics of satellite networks.

7. Network Security

• Firewalls: Protect networks from unauthorized access.
• VPNs (Virtual Private Networks): Secure remote access to networks.
• Encryption: Techniques like AES, RSA, and SSL/TLS for securing data.

8. Error Detection and Correction

• Parity Check: Simple error detection method.
• CRC (Cyclic Redundancy Check): Advanced error detection technique.
• Hamming Code: Error correction method used in digital communication.

9. Network Troubleshooting

• Ping and Traceroute: Tools for diagnosing network issues.
• Network Monitoring: Tools like Wireshark for analyzing network traffic.

Preparation Tips for CRPF Entrance Exams

1. Understand the Syllabus: Familiarize yourself with the exam syllabus and focus on the topics mentioned above.
2. Practice Numerical Problems: Many questions involve calculations (e.g., subnetting, transmission rates).
3. Study Previous Year Papers: Analyze past exam papers to understand the question pattern and difficulty level.
4. Use Reliable Study Materials: Refer to standard textbooks and online resources for networking.
5. Take Mock Tests: Regularly attempt mock tests to improve your speed and accuracy.
6. Focus on Practical Applications: Understand how theoretical concepts are applied in real-world scenarios, especially in CRPF operations.

NETWORKING

1. The method of internet access that requires a phone line, but offers faster access speed than dial-up is the ………. connection.
A) Cable access
B) Satellite access
C) Fiber optic serving
D) DSL
Answer: D) DSL

2. Which of the following cannot be part of an e-mail address?
A) Period (.)
B) @
C) Space ( )
D) Underscore (_)
Answer: C) Space ( )

3. For large networks ………. topology is used.
A) Mesh
B) Star
C) Ring
D) Bus
Answer: A) Mesh

4. …………. allows LAN users to share computer programs and data.
A) Communication server
B) Print server
C) File server
D) All
Answer: C) File server

5. Ethernet uses ……………
A) Bus topology
B) Ring topology
C) Mesh topology
D) All
Answer: A) Bus topology

6. ……….. is always required in WAN.
A) High bandwidth communication source link
B) High-speed processors
C) Both A and B
D) None
Answer: A) High bandwidth communication source link

7. Which of the following topologies is not of broadcast type?
A) Star
B) Bus
C) Ring
D) All
Answer: C) Ring

8. The consideration of a topology for networking depends on ……………..
A) No. of terminals to be used
B) Budget
C) Both (A) & (B)
D) None of the above
Answer: C) Both (A) & (B)

9. Which of the following is not a network protocol?
A) FDDI
B) Ethernet
C) STAR
D) ATM
Answer: C) STAR

10. When you use browse and request www.crpf.gov.in, www is ……….
A) Hostname
B) Top-level domain
C) Service
D) Country-level domain
Answer: C) Service

11. Normal Switches work on …………… layer of the OSI model.
A) Physical layer
B) Data link layer
C) Network layer
D) Transport Layer
Answer: B) Data link layer

12. …….. protocol defines how a file can be transferred from one host to another.
A) HTTP
B) SNMP
C) FTP
D) POP
Answer: C) FTP

13. ……….. file is required to install Lync on Windows XP/7 32-bit operating system.
A) LyncSetupEval.EXE
B) Rootca.PFX
C) Lynccert.PFX
D) Silverlight.Exe
Answer: A) LyncSetupEval.EXE

14. Loopback address of IPv4 is ……………
A) 126.0.0.1
B) 127.0.0.1
C) 128.0.0.1
D) 129.0.0.1
Answer: B) 127.0.0.1

15. Protocol used in CRPF VPN is …………….
A) PPTP
B) L2TP
C) PPP
D) All of these
Answer: D) All of these

16. In star topology ………. peripheral is compulsory to be used.
A) Switch
B) Router
C) Bridge
D) None of these
Answer: A) Switch

17. In IPv4, Class …………. address, the first two octets represent network address and two octets are host addresses.
A) Class A
B) Class B
C) Class C
D) Class D
Answer: B) Class B

18. ……….. EIA/TIA standard is used in UTP straight patch cable.
A) TIA568A
B) TIA568B
C) EIA569A
D) TIA596B
Answer: B) TIA568B

19. Terminator is used in …………… topology.
A) Star
B) Ring
C) Bus
D) Mesh
Answer: C) Bus

20. Switch is a ………. device.
A) Electrical
B) Networking
C) Layer 1
D) None of this
Answer: B) Networking

21. The …….. is a way to resolve meaningful and easy-to-remember names of IP addresses.
A) ARP
B) RARP
C) DNS
D) DMS
Answer: C) DNS

22. In network ………….. topology gives equal access permission.
A) Star
B) Mesh
C) Peer to Peer
D) Client Server
Answer: C) Peer to Peer

23. Multi-mode fiber cable uses …………. as a light source.
A) LED
B) LCD
C) LASER
D) IPS
Answer: A) LED

24. Bluetooth PANs are called …………….
A) Pironets
B) Piconets
C) LAN
D) WAN
Answer: B) Piconets

25. RJ in RJ45 stands for ……………….
A) Required Jack
B) Registered Jack
C) Recommended Jack
D) None of these
Answer: B) Registered Jack

26. Full Form of OSI is ………………………..
A) Open System Interface
B) Open Standard Interface
C) Open System Interconnect
D) Open System Interface
Answer: C) Open System Interconnect

27. OSI model consists of ……………….. no. of layers.
A) 4
B) 7
C) 8
D) 5
Answer: B) 7

28. Protocol used in the Internet is ………………
A) OSI
B) TCP/IP
C) LocalTalk
D) IPX
Answer: B) TCP/IP

29. Router reads …………….. address of the datagram.
A) MAC
B) IP
C) Physical Address
D) None
Answer: B) IP

30. The most important or powerful computer in a typical network?
A) Desktop
B) Network client
C) Network server
D) Network station
Answer: C) Network server

31. ……….. is a combination of hardware and software which provides the facility of exchanging information between the computing devices.
A) Network
B) Peripherals
C) Expansion board
D) Digital devices
Answer: A) Network

32. Servers are those computers which offer services to other …………. computers.
A) Network
B) Mainframe
C) Supercomputer
D) Client
Answer: D) Client

33. Which of the following refers to a small single-site network?
A) LAN
B) DSL
C) RAM
D) USB
Answer: A) LAN

34. Computers connected to a LAN can ……….
A) Go online
B) Share information
C) E-mail
D) None
Answer: B) Share information

35. If a computer on the network shares resources for others to use, it is called ………
A) Server
B) Client
C) Peer
D) Mainframe
Answer: A) Server

36. In ….. topology, if a computer’s network cable is broken, the whole network goes down.
A) Bus
B) Star
C) Mesh
D) All of these
Answer: A) Bus

37. In a ring topology, the computer in possession of the ………… can transmit data.
A) Packet
B) Data
C) Access method
D) Token
Answer: D) Token

38. Which of the following are true statements about modems?
A) Modems use telephone line
B) Modem stands for modulator and demodulator
C) Modems are no longer used in secure networks
D) Both A & B
Answer: D) Both A & B

39. Which of the following is not a network device?
A) Gateway
B) Router
C) Switch
D) Linux
Answer: D) Linux

40. Your company has a large internal network that you would like to subnet into smaller parts. Which of the following devices can you use to separate your LAN and still protect critical resources?
A) An internal firewall
B) A router between subnets
C) A switch between depots
D) All
Answer: B) A router between subnets

41. Which of the following are considered to be components of Ethernet LAN?
A) STP
B) Coaxial
C) Fiber
D) All
Answer: D) All

42. …………. is the device specially designed to forward packets to specific ports based on the packet’s address.
A) Specialty hub
B) Switching hub
C) Port hub
D) Filtering hub
Answer: B) Switching hub

43. Your company receives internet access through a network or gateway server. Which of the following devices is best suited to protect resources and subnet your LAN directly on the network server?
A) DSL modem
B) A multihomed firewall
C) VLAN
D) A router that acts both as a bridge and router
Answer: B) A multihomed firewall

44. Typical data transfer rate in LAN is ………
A) Bits per second
B) Mbps
C) Kbps
D) Tbps
Answer: B) Mbps

45. The advantage of LAN is …………
A) Sharing peripherals
B) Backing up your data
C) Saving all your data
D) Accessing the web
Answer: A) Sharing peripherals

46. To reset the password of a domain user, you should log in to the server by ……….
A) Domain admin
B) Local administrator
C) Local user
D) Domain user
Answer: A) Domain admin

47. Which class of IP address provides a maximum of only 254 host addresses per network ID?
A) CLASS A
B) CLASS B
C) CLASS C
D) CLASS D
Answer: C) CLASS C

48. If you use either Telnet or FTP, which is the highest layer you are using to transmit data?
A) Application layer
B) Presentation layer
C) Session layer
D) Transport layer
Answer: A) Application layer

49. How long is an IPv6 address?
A) 32-bit
B) 128-bit
C) 64-bit
D) 128 bytes
Answer: B) 128-bit

50. Which one of the following is non-volatile storage?
A) ROM Bios
B) CPU
C) RAM
D) None
Answer: A) ROM Bios

51. Which term is not related to wireless encryption?
A) WEP
B) WPA
C) AES
D) SMTP
Answer: D) SMTP

52. Which command is used for testing connectivity between computers in a network?
A) Tracert
B) ipconfig
C) Ping
D) cmd
Answer: C) Ping

53. What is the default subnet mask for class C network?
A) 127.0.0.1
B) 255.255.255.0
C) 255.255.0.0
D) 255.0.0.0
Answer: B) 255.255.255.0

54. How many hosts are attached to each of the local area networks at your sites?
A) 128
B) 254
C) 256
D) 228
Answer: B) 254

55. A distributed network configuration in which all data/information pass through a central computer is ……………..
A) Bus network
B) Star network
C) Ring network
D) Mesh network
Answer: B) Star network

56. Which one of the following is the fastest data transfer?
A) RS-232
B) USB
C) Parallel
D) SATA 6.0
Answer: D) SATA 6.0

57. The ………………. chipset handles communications between the CPU, RAM, AGP, and PCI Express.
A) Northbridge
B) CMOS
C) BIOS
D) SouthBridge
Answer: A) Northbridge

58. Which type of communication media is most widely used for data transfer for long-distance communication today?
A) Cat-5
B) Twisted pair
C) Co-axial
D) Optical fibre
Answer: D) Optical fibre

59. ………….. protocol is used for secured websites.
A) http
B) ftp
C) smtp
D) https
Answer: D) https

60. Component of a server that controls the user area is called ……………..
A) DHCP
B) DNS
C) DOMAIN
D) Terminal Server
Answer: D) Terminal Server

61. A …….. is a device that forwards packets between networks by processing the routing information included in the packet.
A) Bridge
B) Firewall
C) Router
D) All of these
Answer: C) Router

62. Which one of the following extends a private network across public networks?
A) LAN
B) VPN
C) WWW
D) NAS
Answer: B) VPN

63. The OSI model has ……….. layers.
A) 4
B) 5
C) 6
D) 7
Answer: D) 7

64. TCP/IP model does not have …………….. layer but OSI model has this layer.
A) Session layer
B) Presentation layer
C) Application layer
D) Both (A) and (B)
Answer: D) Both (A) and (B)

65. Which layer is responsible to process delivery?
A) Network layer
B) Transport layer
C) Session layer
D) Data link layer
Answer: B) Transport layer

66. Which layer provides the services to the user?
A) Application layer
B) Session layer
C) Presentation layer
D) None of these
Answer: A) Application layer

67. The 4-byte IP address consists of ………………
A) Network address
B) Host address
C) Both A & B
D) None of these
Answer: C) Both A & B

68. If you want to find the number of routers between a source and destination, the utility to be used is …………..
A) Route
B) Ipconfig
C) Ifconfig
D) Traceroute
Answer: D) Traceroute

69. DHCP (Dynamic Host Configuration Protocol) provides …………. to the client.
A) IP address
B) MAC address
C) URL
D) None of these
Answer: A) IP address

70. DHCP is used for ……………….
A) IPv6
B) IPv4
C) Both A & B
D) None of these
Answer: C) Both A & B

71. Physical or logical arrangement of a network is ……………
A) Topology
B) Routing
C) Networking
D) None of these
Answer: A) Top

Conclusion

Computer networking is a cornerstone of modern communication systems, and its importance cannot be overstated for CRPF roles. By focusing on the key topics, practicing diligently, and understanding the practical applications, you can not only ace the CRPF entrance exams but also contribute significantly to the force’s mission.

Good luck with your preparation! Stay focused, stay motivated, and remember that your hard work will pave the way for a rewarding career in the CRPF.

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