4.5.10

You need to enable hosts on your network to find the IP address of logical names, such as srv1.myserver.com. Which device should you use?

DNS server

Listed below are several DNS record types. Match each record type on the left with its function on the right.

A CNAME PTR AAAA MX

You want to implement a protocol on your network that allows computers to find a host's IP address from a logical name. Which protocol should you implement?

DNS

Which of the following services automatically creates and deletes host records when an IP address lease is created or released?

Dynamic DNS

If dynamic DNS is in use, which of the following events causes a dynamic update of the host records? (Select two.)

Enter the ipconfig /registerdns command on a workstation. Renew the DHCP server's IP address lease.

You are the network administrator for a small consulting firm. The firm has recently rolled out a new intranet site, and you are responsible for configuring the DNS. You are able to connect to the intranet site by using the IP address, but you cannot connect when you use the hostname. Which of the following do you need to configure so that the site can be accessed with the hostname?

Forward lookup zone

Which of the following is the first place a computer looks at during the name resolution process?

HOSTS file

What is the process of a DNS server asking other DNS servers to perform name resolution known as?

Recursive lookup

You are the network administrator for a consulting firm. A website that users on your network visit has a habit of frequently changing its IP address. When these IP mappings change, users are unable to connect until you clear the DNS cache. Which of the following settings should you configure so that the cache does not need to be manually cleared every time?

Time to live

In this scenario, you would most likely need to configure the forward lookup zone. The forward lookup zone matches the hostname to the IP address. You wouldn't need to configure the reverse lookup zone since you can access the intranet site using the IP address. A reverse lookup zone matches the IP address to the hostname. Dynamic DNS (DDNS) enables clients or the DHCP server to update records in the zone database automatically. This occurs whenever an IP address lease is created or renewed. This is not necessary in this scenario. The CNAME record provides alternate names (or aliases) to hosts that already have a host record. Using a single A record with multiple CNAME records means that when the IP address changes, only the A record needs to be modified. This is not necessary in this scenario.

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