CodeHS Cyber Network Security

What is the purpose of a firewall in network security?

• Firewalls are only necessary for small networks

• Firewalls are designed to block all network traffic

• Firewalls are used to increase network speed

• The purpose of a firewall in network security is to monitor and control network traffic to protect against unauthorized access and cyber attacks.

Explain the role of SSL/TLS in securing network communications.

• SSL/TLS slows down network communication by adding unnecessary overhead

• SSL/TLS makes network communication vulnerable to cyber attacks

• SSL/TLS only focuses on data integrity without encryption

• SSL/TLS encrypts data, ensuring confidentiality, integrity, and authenticity of network communication.

What is the difference between WPA and WPA2 in wireless security protocols?

• WPA uses stronger encryption methods than WPA2

• WPA2 is less secure than WPA due to outdated security features

• WPA2 is more secure than WPA due to stronger encryption methods and security features.

• WPA and WPA2 provide the same level of security

Describe the function of VPNs in network security.

• VPNs slow down network performance without providing any security benefits

• VPNs have no impact on network security and are purely for show

• VPNs weaken network security by exposing data to unauthorized access

• VPNs enhance network security by creating encrypted connections over insecure networks, ensuring data confidentiality and integrity while allowing secure remote access to private networks.

What is the significance of implementing multi-factor authentication in network security?

• Multi-factor authentication slows down network performance

• Multi-factor authentication increases the risk of security breaches

• Multi-factor authentication is only necessary for personal accounts, not business networks

• Multi-factor authentication enhances security by requiring multiple forms of verification before granting access.

How does DNSSEC enhance the security of domain name system?

• DNSSEC enhances security by blocking access to DNS servers.

• DNSSEC enhances security by increasing the speed of DNS resolution.

• DNSSEC enhances security by encrypting DNS records.

• DNSSEC enhances security by adding cryptographic signatures to DNS records.

Discuss the importance of intrusion detection systems (IDS) in network security.

• IDS are unnecessary and do not contribute to network security.

• IDS only slow down network performance without providing any benefits.

• IDS are only useful for monitoring network traffic but do not prevent any security breaches.

• IDS play a vital role in identifying and responding to potential threats, enhancing overall network security.

Explain the concept of packet filtering in the context of network security.

• Packet filtering involves encrypting all data packets to ensure secure transmission.

• Packet filtering is a technique used to physically separate network cables to prevent interference.

• Packet filtering is a method used to increase network speed by removing unnecessary data packets.

• Packet filtering is a method used in network security to control the flow of data packets based on predefined rules.

What are some common encryption algorithms used in network security protocols?

• DES

• AES, RSA, SSL/TLS

• MD5

• 3DES

How do network security protocols help prevent unauthorized access to sensitive data?

• Network security protocols prevent unauthorized access to sensitive data by disabling all security measures.

• Network security protocols prevent unauthorized access to sensitive data by sharing passwords with everyone.

• Network security protocols prevent unauthorized access to sensitive data by encrypting data transmissions, authenticating users, and implementing firewalls.

• Network security protocols prevent unauthorized access to sensitive data by broadcasting data openly.