Network+/Objectives/Network Security

4.1 Explain the importance of basic network security concepts.

• Logical security
  • Encryption
    • Data in transit
    • Data at rest
  • Certificates
    • Public key infrastructure (PKI)
    • Self-signed
  • Identity and access management (IAM)
    • Authentication
    • Multifactor authentication (MFA)
    • Single sign-on (SSO)
    • Remote Authentication Dial-in User Service (RADIUS)
    • LDAP
    • Security Assertion Markup Language (SAML)
    • Terminal Access Controller Access Control System Plus (TACACS+)
    • Time-based authentication
    • Authorization
    • Least privilege
    • Role-based access control
  • Geofencing

• Physical security
  • Camera
  • Locks
• Deception technologies
  • Honeypot
  • Honeynet
• Common security terminology
  • Risk
  • Vulnerability
  • Exploit
  • Threat
  • Confidentiality, Integrity, and Availability (CIA) triad
• Audits and regulatory compliance
  • Data locality
  • Payment Card Industry Data Security Standards (PCI DSS)
  • General Data Protection Regulation (GDPR)
• Network segmentation enforcement
  • Internet of Things (IoT) and Industrial Internet of Things (IIoT)
  • Supervisory control and data acquisition (SCADA), industrial control system (ICS), operational technology (OT)
  • Guest
  • Bring your own device (BYOD)

Further reading

• Remote access service (RAS)
• Wireless LAN controller (WLC)

4.2 Summarize various types of attacks and their impact to the network.

• Denial-of-service (DoS)/distributed denial-of-service (DDoS)
• VLAN hopping
• Media Access Control (MAC) flooding
• Address Resolution Protocol (ARP) poisoning
• ARP spoofing
• DNS poisoning
• DNS spoofing

• Rogue devices and services
  • DHCP
  • AP
• Evil twin
• On-path attack
• Social engineering
  • Phishing
  • Dumpster diving
  • Shoulder surfing
  • Tailgating
• Malware

4.3 Given a scenario, apply network security features, defense techniques, and solutions.

• Device hardening
  • Disable unused ports and services
  • Change default passwords
• Network access control (NAC)
  • Port security
  • 802.1X
  • MAC filtering

• Key management
• Security rules
  • Access control list (ACL)
  • Uniform Resource Locator (URL) filtering
  • Content filtering
• Zones
  • Trusted vs. untrusted
  • Screened subnet