Supporting Network Services

Key Concepts

• Understand common network services: DHCP, DNS, file/print servers
• Recognize protocols related to network services (SMB, FTP, SMTP, IMAP, POP3)
• Understand virtual networks: VLANs and VPNs
• Understand how DNS queries and records work (A, AAAA, CNAME, MX, SPF, DKIM, DMARC)
• Describe the role of directory and authentication services (LDAP, AAA)
• Understand remote access technologies (SSH, RDP, Telnet)

Homelab

1. Open Command Prompt
2. Use Commands:
   • nslookup google.com (A record)
   • nslookup -query=AAAA google.com (IPv6)
   • nslookup -query=CNAME www.microsoft.com
3. Note IP addresses and aliases
4. Look up MX records for a domain: nslookup -query=MX gmail.com
5. Use online tools (MXToolbox) to check SPF, DKIM, DMARC for popular domains

Alternate Lab

1. On Windows:
   • Create a shared folder (Right Click → Properties → Sharing)
   • Access it from another device on the same network
2. Use FTP server software (FileZilla Server)
   • Set up a local FTP server
   • Connect to it with an FTP client (FileZilla CLient) from another device