TCP/IP IPv6 and IPv4

Which process provides a mechanism whereby DNS can attempt to satisfy name resolution requests locally before attempting them remotely, thereby greatly improving the speed of such name resolution?

Which record is used to route SMTP-based e-mail on the Internet and identify the IP address for a domain's master e-mail server?

Which command is an essential tool for testing when configuring or troubleshooting a DNS server?

Not all the data in a DNS cache has an expiration value.

When a TCP/IP client uses a resolver to send a name query to a DNS server, that client obtains the address for the DNS server it queries from its TCP/IP configuration data.

Data associated with domain names, address records, and other specific data of interest to the Domain Name System is stored on a DNS server in special database records called which of the following?

Twenty-six root name servers (named A.ROOT-SERVERS.NET., B.ROOT-SERVERS.NET., etc.) act as the top of the DNS hierarchy worldwide. They provide the ultimate source for all name lookups that cannot be resolved through other means. Indicate the answer choice that best completes the statement or answers the question.

Which resource record lists the IP-based services, such as Telnet, FTP, HTTP, and so forth, that an Internet host can supply?

DNS servers cache name and address pairs for addresses they resolved, and they keep information about name requests that result in error messages. What is this information called?

What type of servers are used to store recently accessed DNS records from other domains to avoid incurring the performance overhead involved in making a remote query each time a resource outside the local domain is accessed?

Which type of resource record stores IP address-to-domain name translation data and supports the operation known as a reverse DNS lookup?

The structure of the DNS database mirrors the structure of the domain namespace itself.

An application or service that encounters a domain name for which it needs an IP address is known as which of the following?

It is important to understand that the zone data on a secondary server always originates from which type of server?

When one DNS server receives a recursive request, that DNS server issues which of the following to the name servers in its hierarchy, or to servers provided as pointers in reply to earlier requests, until an answer is received?

What are the files called that map addresses to domain names for reverse lookups?

Which command is used to show active TCP connections, listening ports, Ethernet statistics, IPv4 statistics, and IPv6 statistics

Domains (such as ibm.com) can be broken into subdomains (such as clearlake.ibm.com), as needed.

The records in which file are provided to support reverse DNS lookups?

What type of query is known as a query that keeps working until an answer of some kind is forthcoming?