LAB : CONFIGURING DNS RECORDS

Exercise9.1 Managing DNS Resource Records

Overview

In the previous lab, you created several zones. With the exception of default resource records that are created when you create a zone, you need to add resource records. Therefore, during this exercise, you create resource records.

Mindset

The Host (A or AAAA) resource record is the most common resource record, which is used to resolve IP addresses from host names. However, you also need to be familiar with other common resource records (such as PTR, MX, and CNAME resource records).

Exercise9.2 Configuring Round Robin

Overview

By default, DNS Round Robinis enabled. Round robin operates by providing one DNS server IP address to a given query, then provides a different IP address for the next query, and so on, until a configured list of DNS server IP addresses runs out.

The last query causes a loop-around to the first IP address and begins the sequence over again. In this exercise, you create two resource records to demonstate round robin switching between two separate DNS IP addresses

Mindset

Round robin is a DNS balancing mechanism that distributes network load among multiple servers by rotating resource records retrieved from a DNS server.

Exercise9.3 Configuring Zone Scavenging

Overview

With dynamic addresses, often resource records will be added to a DNS zone, and will remain there unless they are manually deleted or scavanged. During this exercise, you configure zone scavenging.

Mindset

When you want DNS zone scavenging, you must enable scavenging at the server and at the zone.

Exercise9.4 Troubleshooting DNS

Overview

In Exercise 9.2, you used nslookup to show name/IP resolution. However, during this exercise, you use nslookup in other ways to test DNS. You also use the DNS built-in tools to test DNS.

Mindset

Because DNS is an essential service that can bring any network down when it is not available, you need to know how to troubleshoot it. Microsoft provides several tools to help you troubleshoot DNS problems, including the IPConfig command, the NSLookup command, and the DNS console.

LAB REVIEW QUESTIONS

1. In Exercise 9.1,what is the most commonly used DNS resource record?

2. In Exercise 9.1, where is the default TTL stored?

3. In Exercise 9.1, where are PTR records stored?

4. In Exercise 9.1, what view do you need to be in to modify the TTL for an individual record?

5. In Exercise 9.2, how did you enable round robin?

6. In Exercise 9.3, to enable zone scavenging, what two places did you have to configure?

7. In Exercise 9.4, what tool is used to test DNS queries?

Lab Challenge Using the DNSCMD Command to Manage Resource Records

Overview

To complete this challenge, you must demonstrate how to use the DNSCMD command.

Mindset

In the last lab, you were introduced to the dnscmd command to create zones. In this lesson, you can also use the dnscmd command to manage resource records.