unit 3.2(b)

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 type of DNS record resolves IPv6 addresses?

AAAA.

What type of DNS enables clients to report a change of IP address to a DNS server?

Dynamic DNS.

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 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 types of DNS records have priority or preference values?

Typically mail (MX) and service (SRV) records.

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 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 command would you use to view cached NetBIOS name entries?

nbtstat -c