LPIC 1 Networking and Security Quiz

1. What does DNS stand for?

Dynamic Name System

Domain Name System

Data Network Service

Digital Network Security

2. Which protocol operates at the Transport Layer and provides connectionless communication?

TCP

UDP

ICMP

IGMP

3. What is the primary role of the sudo command in Linux security?

Create user accounts

Allow authorized users to execute commands as superuser

Encrypt file systems

Configure network interfaces

4. Which file contains the mapping of IP addresses to hostnames for local network resolution?

/etc/resolv.conf

/etc/hosts

/etc/hostname

/etc/network/interfaces

5. The subnet mask 255.255.255.0 corresponds to which CIDR notation?

/16

/24

/25

/32

6. Which authentication method uses a key pair for secure login without passwords?

Password authentication

Public key authentication

Biometric authentication

Token-based authentication

7. What is the primary purpose of a firewall in network security?

Encrypt all network traffic

Filter and control incoming and outgoing network traffic

Compress network packets

Assign IP addresses automatically

8. Which command displays all network connections and listening ports on a Linux system?

Ifconfig

Netstat -tuln

Route

Arp

9. The /etc/shadow file stores______ in an encrypted format.

User passwords

Hostnames

Network routes

Firewall rules

10. Which protocol is used for secure file transfer as a replacement for FTP?

SFTP

HTTPS

FTPS

Both A and C

11. Which layer of the OSI model is responsible for routing data packets between networks?

Data Link Layer

Network Layer

Transport Layer

Application Layer

12. Which command is used to configure firewall rules on a Linux system using iptables?

Firewall-cmd

Ufw

Iptables

All of the above

13. In Linux, what permission octal value represents read, write, and execute for the owner?

5

6

7

8

14. Which utility is used to test network connectivity by sending ICMP echo requests?

Traceroute

Netstat

Ping

Dig

15. What does CIDR notation 192.168.1.0/24 represent?

A single host address

A network with 256 usable host addresses

A network with 254 usable host addresses

A broadcast-only network

16. Which file in Linux stores user account information including usernames and UIDs?

/etc/shadow

/etc/passwd

/etc/sudoers

/etc/hosts

17. What is the default SSH port number?

20

21

22

23

18. In Linux file permissions, what does the sticky bit do when set on a directory?

Only the owner can delete files in that directory

Files are automatically compressed

All users get read access

The directory becomes hidden

19. Which command displays the current network configuration and IP address on a Linux system?

Ifconfig or ip addr

Netstat -a

Route -n

Arp -a

20. What does TCP stand for in networking?

Transfer Control Protocol

Transmission Control Protocol

Transfer Communication Protocol

Transmission Cellular Protocol

LPIC 1 Basic Networking and Security Quiz