Question 1:

Which of the following is the primary purpose of a router in a network?
A. To connect different types of network segments
B. To assign IP addresses to devices on the network
C. To prevent unauthorized access to a network
D. To store and forward email messages
Correct Answer: A. To connect different types of network segments
Explanation: A router is used to route data between different networks, enabling communication between different network segments (e.g., LAN and WAN).

Question 2:

Which of the following protocols is used for secure communication over a network?
A. HTTP
B. FTP
C. HTTPS
D. POP3
Correct Answer: C. HTTPS
Explanation: HTTPS (Hypertext Transfer Protocol Secure) is the secure version of HTTP and uses encryption (SSL/TLS) to secure data during transmission.

Question 3:

Which layer of the OSI model is responsible for end-to-end communication and error handling?
A. Data Link Layer
B. Transport Layer
C. Network Layer
D. Session Layer
Correct Answer: B. Transport Layer
Explanation: The Transport Layer (Layer 4) is responsible for end-to-end communication, ensuring reliable data transfer, error handling, and flow control.

Question 4:

In an IP address, what does the subnet mask determine?
A. The network portion of the address
B. The range of available host IP addresses
C. The default gateway address
D. The DNS server address
Correct Answer: A. The network portion of the address
Explanation: The subnet mask defines the boundary between the network portion and the host portion of an IP address, helping to determine which addresses belong to the local network.

Question 5:

Which of the following topologies allows for a direct connection between each device?
A. Star
B. Mesh
C. Bus
D. Ring
Correct Answer: B. Mesh
Explanation: In a mesh topology, each device is directly connected to every other device, providing high redundancy and fault tolerance.

Question 6:

Which device is used to connect multiple devices within a local area network (LAN)?
A. Router
B. Switch
C. Bridge
D. Hub
Correct Answer: B. Switch
Explanation: A switch is used to connect multiple devices within a LAN and forwards data to the correct device based on its MAC address.

Question 7:

Which of the following is the default port number for HTTP?
A. 21
B. 25
C. 80
D. 443
Correct Answer: C. 80
Explanation: Port 80 is the default port used for HTTP (Hypertext Transfer Protocol) communication.

Question 8:

What does NAT (Network Address Translation) primarily do?
A. Encrypts data for secure transmission
B. Translates private IP addresses to public IP addresses
C. Assigns IP addresses to devices in a network
D. Routes packets between different subnets
Correct Answer: B. Translates private IP addresses to public IP addresses
Explanation: NAT is used to map private IP addresses within a local network to a public IP address for communication on the internet.

Question 9:

Which of the following is an example of a class B private IP address?
A. 10.0.0.1
B. 172.16.0.1
C. 192.168.1.1
D. 224.0.0.1
Correct Answer: B. 172.16.0.1
Explanation: The private IP address range for Class B is 172.16.0.0 to 172.31.255.255.

Question 10:

Which Wi-Fi security protocol provides the highest level of security?
A. WEP
B. WPA
C. WPA2
D. WPA3
Correct Answer: D. WPA3
Explanation: WPA3 is the latest and most secure Wi-Fi security protocol, offering stronger encryption and protection against brute-force attacks.

Question 11:

Which of the following is a valid IPv6 address format?
A. 192.168.1.1
B. 3001:0:0:0:0:0:0:0
C. 255.255.255.0
D. 172.16.1.1
Correct Answer: B. 3001:0:0:0:0:0:0:0
Explanation: IPv6 addresses are written as eight groups of four hexadecimal digits separated by colons.

Question 12:

Which OSI layer is responsible for data encryption and decryption?
A. Physical Layer
B. Data Link Layer
C. Transport Layer
D. Presentation Layer
Correct Answer: D. Presentation Layer
Explanation: The Presentation Layer (Layer 6) is responsible for data formatting, including encryption and decryption.

Question 13:

Which of the following protocols is used to resolve domain names to IP addresses?
A. HTTP
B. FTP
C. DNS
D. SMTP
Correct Answer: C. DNS
Explanation: The Domain Name System (DNS) resolves human-readable domain names to IP addresses to facilitate communication over the internet.

Question 14:

What type of attack involves disrupting network traffic by overwhelming a target with excessive data?
A. Phishing
B. Denial of Service (DoS)
C. Man-in-the-middle
D. SQL Injection
Correct Answer: B. Denial of Service (DoS)
Explanation: A DoS attack overwhelms a target system or network with traffic to disrupt normal operations.

Question 15:

Which of the following is a public IPv4 address?
A. 192.168.1.1
B. 10.1.1.1
C. 172.16.5.1
D. 8.8.8.8
Correct Answer: D. 8.8.8.8
Explanation: 8.8.8.8 is a public IP address used by Google as a public DNS server. The other options are private IP addresses.

Question 16:

Which of the following devices is used to filter traffic based on predetermined rules?
A. Hub
B. Switch
C. Router
D. Firewall
Correct Answer: D. Firewall
Explanation: A firewall is used to monitor and filter incoming and outgoing network traffic based on security rules.

Question 17:

What is the maximum transmission unit (MTU) for an Ethernet frame?
A. 512 bytes
B. 1024 bytes
C. 1500 bytes
D. 2048 bytes
Correct Answer: C. 1500 bytes
Explanation: The standard MTU for Ethernet frames is 1500 bytes, which is the maximum size for data packets.

Question 18:

Which of the following IP address ranges is designated for Class C networks?
A. 192.168.0.0 – 192.168.255.255
B. 10.0.0.0 – 10.255.255.255
C. 172.16.0.0 – 172.31.255.255
D. 192.0.0.0 – 223.255.255.255
Correct Answer: D. 192.0.0.0 – 223.255.255.255
Explanation: Class C networks are assigned IP addresses in the range 192.0.0.0 to 223.255.255.255.

Question 19:

Which protocol does SMTP use to send email?
A. TCP
B. UDP
C. HTTP
D. FTP
Correct Answer: A. TCP
Explanation: SMTP (Simple Mail Transfer Protocol) uses TCP to ensure reliable email delivery over the network.

Question 20:

What is the main function of a DHCP server?
A. Assigning IP addresses to devices on the network
B. Encrypting data for secure transmission
C. Routing traffic between networks
D. Providing web hosting services
Correct Answer: A. Assigning IP addresses to devices on the network
Explanation: The DHCP (Dynamic Host Configuration Protocol) server automatically assigns IP addresses to devices on a network.