Module 3 / Unit 3 Name Resolution and IPAM Flashcards
On completion of this unit, you will be able to: □ Describe the format of host names and Fully Qualified Domain Names. □ Understand the process of name resolution using HOSTS and DNS. □ Identify basic configuration parameters for a DNS server, including different types of DNS records. □ Use nslookup and dig to verify and troubleshoot name resolution. □ Understand the role of IPAM tools.
What is a generic top-level domain?
FQDNs are arranged in a hierarchy from the root. Top-level domains are those farthest to the right. Generic TLDs are those maintained by ICANN (.com, .org, .net, .info, .biz) - the other main sets of TLDs are country codes and sponsored
What characters are allowed in a DNS host name?
Up to 63 alphanumerics and the hyphen, though the hyphen cannot be used at the beginning or end of the name.
What is the location of the hosts file?
Under Windows it is %SystemRoot%\system32\drivers\etc\ while under Linux it is usually placed in the /etc directory.
What type of DNS record resolves IPv6 addresses?
AAAA.
What type of DNS server is likely to accept recursive queries?
A local name server providing DNS resolution for ordinary workstations. Queries between name servers are usually iterative.
What use is a PTR DNS record?
A pointer maps an IP address to a host name enabling a reverse lookup. Reverse lookups are used (for example) in spam filtering to confirm that a host name is associated with a particular IP address.
What types of DNS records have priority or preference values?
Typically mail (MX) and service (SRV) records.
What type of DNS record is used to prove the valid origin of email?
Sender Policy Framework (SPF) and DomainKeys Identified E-mail (DKIM) records can be used to validate the origin of email and reject spam. These are configured in DNS as TXT (text) records.
What type of DNS enables clients to report a change of IP address to a DNS server?
Dynamic DNS.
What is the function of the command “nslookup – 8.8.8.8”?
To start nslookup in interactive mode with the DNS server set to 8.8.8.8 (Google’s public DNS server).
What is the function of a dig subcommand such as “+nostats”?
Control what is shown by the tool. You can use these commands to suppress certain kinds of output, such as sections of the response from the DNS server.
What type of server infrastructure is IPAM designed to monitor?
IP Address Management (IPAM) is used to monitor (and manage) DHCP and DNS services (and Domain Controllers in a Windows network environment).
