DHCP, DNS, NAT, NTP, SNMP, syslog, QoS, SSH.
The supporting services that make a network usable: dynamic addressing, name resolution, address translation between private and public space, time synchronization, monitoring, and the management protocols you'll use every day.
Welcome to module 5. DHCP, DNS, NAT, NTP, SNMP, syslog, QoS, SSH. I'll meet you again at the top of every chapter — this module's course coverage is 14%, so don't rush it. Pick chapter 5.1 below to start.
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DHCP gives every host an IP, mask, gateway, and DNS without anyone touching the keyboard. This chapter walks through the DORA exchange, configures a router as a DHCP server, and explains the ip helper-address relay.
Four supporting services every production network depends on: DNS resolves names to IPs, NTP keeps clocks accurate, SNMP polls device health, and syslog records events centrally for forensics.
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NAT translates private RFC 1918 addresses to a public address so private hosts can reach the Internet. PAT (overload) is the variant that maps many private hosts onto a single public IP via port numbers — the configuration almost every home and small office uses.