DNS and DHCP Configuration Charles Warren

The Basics of IP Addressing What are the two methods of assigning an IP address to a host?

Static IP Assignments The advantages of static assignments are that you can also refer to that host by the IP that you have specified. This is crucial when setting up a server environment. The disadvantages of statically assigning IP addresses is the amount of time and documentation that is required.

Dynamic IP Assignments The advantages of dynamic assignments are that they can all be easily viewed, created, and cleared through a DHCP server. The disadvantage of dynamically assigning addresses is that key central services require static addresses.

DHCP – Dynamic Host Configuration Protocol DHCP is the method of which dynamic IP addresses are assigned. Key Terms Scope – The address pool, exclusions, and options. Reservations – A static addressed assigned by a DHCP server by specifying the MAC Address of a particular host. Exclusions – An address that has been removed from the pool. Options – Additional configuration options Ex. Default Gateway, DNS Servers.

DNS – Domain Name Service DNS takes fully qualified domain names (FQDNs) and maps them to IP addresses. Ex. www.google.com -> 8.8.8.8 A DNS Server maintains host mappings for a domain through different types of records.

DNS Records Record Types: A – Maps a hostname to an IPv4 Address. AAAA – Maps a hostname to an IPv6 Address. PTR – Maps an IP Address to a hostname. CNAME – Creates an alias for an already existing A or AAAA record. MX – Defines the mail servers for a domain.