Chapter 5
Networking Devices

THE FOLLOWING COMPTIA NETWORK+ EXAM OBJECTIVES ARE COVERED IN THIS CHAPTER:

✓ 1.1 Explain the purposes and uses of ports and protocols

• DHCP 67, 68
• DNS 53

✓ 1.2 Explain devices, applications, protocols, and services at their appropriate OSI layers

• Layer 1—Physical
• Layer 2—Data link
• Layer 3—Network
• Layer 4—Transport
• Layer 5—Session
• Layer 6—Presentation
• Layer 7—Application

✓ 1.3 Explain the concepts and characteristics of routing and switching

• Properties of network traffic
  • Broadcast domains
  • CSMA/CD
  • CSMA/CA
  • Collision domains
  • Broadcast
  • Multicast
  • Unicast
• Performance concepts
  • Traffic shaping

✓ 1.4 Given a scenario, configure the appropriate IP addressing components.

• IP reservations

✓ 1.8 Explain the functions of network services

• DNS service
  • Record types
    • A, AAA
    • TXT (SPF, DKIM)
    • SRV
    • MX
    • CNAME
    • NS
    • PTR
  • Internal vs. external DNS
  • Third-party/cloud-hosted DNS
  • Hierarchy
  • Forward...