Computer Networks/Network Services

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This lesson introduces network services.

Objectives and Skills[edit]

Objectives and skills for the network services portion of Network+ certification include:[1]

  • Install and configure the following networking services/applications
    • DHCP
      • Static vs dynamic IP addressing
      • Reservations
      • Scopes
      • Leases
      • Options (DNS servers, suffixes)
      • IP helper/DHCP relay
    • DNS
      • DNS servers
      • DNS records (A, MX, AAAA, CNAME, PTR)
      • Dynamic DNS
    • Proxy/reverse proxy
    • NAT
      • PAT
      • SNAT
      • DNAT
    • Port forwarding
  • Compare and contrast the following ports and protocols
    • 80 HTTP
    • 443 HTTPS
    • 137-139 NetBIOS
    • 110 POP
    • 143 IMAP
    • 25 SMTP
    • 5060/5061 SIP
    • 2427/2727 MGCP
    • 5004/5005 RTP
    • 1720 H.323
    • TCP
      • Connection-oriented
    • UDP
      • Connectionless
  • Given a scenario, configure and apply the appropriate ports and protocols
    • 20,21 FTP
    • 161 SNMP
    • 22 SSH
    • 23 Telnet
    • 53 DNS
    • 67,68 DHCP
    • 69 TFTP
    • 445 SMB
    • 3389 RDP

Readings[edit]

  1. Wikipedia: Dynamic Host Configuration Protocol
  2. Wikipedia: Domain Name System
  3. Wikipedia: Proxy server
  4. Wikipedia: Network address translation
  5. Wikipedia: Port forwarding

Multimedia[edit]

  1. YouTube: DHCP Addressing Overview - CompTIA Network+ N10-006 - 1.3
  2. YouTube: DHCP Reservations - CompTIA Network+ N10-006 - 1.3
  3. YouTube: DHCP Scopes - CompTIA Network+ N10-006 - 1.3
  4. YouTube: DHCP Leases - CompTIA Network+ N10-006 - 1.3
  5. YouTube: DHCP Options - CompTIA Network+ N10-006 - 1.3
  6. YouTube: An Overview of DNS - CompTIA Network+ N10-006 - 1.3
  7. YouTube: DNS Records - CompTIA Network+ N10-006 - 1.3
  8. YouTube: Dynamic DNS - CompTIA Network+ N10-006 - 1.3
  9. YouTube: Proxy Servers - CompTIA Network+ N10-006 - 1.3
  10. YouTube: Understanding Network Address Translation - CompTIA Network+ N10-006 - 1.3
  11. YouTube: Common TCP and UDP Ports - CompTIA Network+ N10-006 - 5.9
  12. YouTube: Application Ports and Protocols - CompTIA Network+ N10-006 - 5.10

Activities[edit]

  1. Review Wikipedia: ipconfig. Use the ipconfig command to view, renew, release, and obtain an IP address through DHCP.
  2. Review Wikipedia: nslookup. Use the following commands to display and query DNS information.
  3. Compare private and public IP addresses.
    • Review Wikipedia: Private network.
    • Use ipconfig to display your IP address. Compare your address to the private network address spaces. Is your local IP address a private or public IP address?
    • Perform an Internet search for "What's my IP". Use the returned information or one of the available sites to identify your public IP address. If this address is different, determine what device is providing NAT services for your network.
    • Use the tracert command to trace the route from your computer to Google's DNS server at 8.8.8.8. Can you find the NAT device in the trace?
  4. Review Wikipedia: netstat. Use the netstat command to display network connections and statistics.

Lesson Summary[edit]

Key Terms[edit]

See Also[edit]

References[edit]