The host name of the fully qualified domain name (FQDN) mail.exchange.corp.nwtraders.com is:

The host name of the fully qualified domain name (FQDN) mail.exchange.corp.nwtraders.com is:
A . corp
B . com
C . nwtraders
D . exchange
E . mail

Answer: E

Explanation:

Hostnames are composed of series of labels concatenated with dots, as are all domain names. For example, let’s break mail.google.com into its component parts:

mail is the host or local hostname; and google.com is the domain or parent domain name.