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07 - DNS Tutorial Overview.
Setting up the third DNS server computer
And imagine when someone queries your DNS, your server1 and server2 each gets 50/50 chance (Many DNS illiterate people believe server1 is the one being queried first, then server2, server3 and so on) and are being queried randomly. When a server3 is added, the chance becomes 33/33/33 (forget the round off). Mathematically you should get 66% when one goes down. At the same time, when additional server is added, the down time rate (all 3 combined) goes up.

Creating a new delegated domain name
DNS provides the option of dividing up the namespace into one or more zones, which can then be stored, distributed, and replicated to other DNS servers. When deciding whether to divide your DNS namespace to make additional zones, consider the following reasons to use additional zones: 1 A need to delegate management of part of your DNS namespace to another location or department within your organization.2 A need to divide one large zone into smaller zones for distributing traffic loads among multiple servers, improve DNS name resolution performance.

Connecting to the 3rd new DNS server from the DNS manager
You can use DNS Manager to perform the following basic administrative server tasks: 1- Performing initial configuration of a new DNS server. 2- Connecting to and managing a local DNS server on the same computer or remote DNS servers on other computers. 3- Adding and removing forward and reverse lookup zones, as necessary. 4- Adding, removing, and updating resource records in zones. 5- Modifying how zones are stored and replicated between servers. 6-Modifying how servers process queries and handle dynamic updates. 7- Modifying security for specific zones or resource records.

Adding the third DNS server to the DNS servers list in DNS manager
In addition, you can also use DNS Manager to perform the following tasks: 1-Perform maintenance on the server. You can start, stop, pause, or resume the server or manually update server data files. 2-Monitor the contents of the server cache and, as necessary, clear it. 3-Tune advanced server options. 4-Configure and perform aging and scavenging of stale resource records that are stored by the server. In addition, you can also operate DNS Manager from a workstation to remotely administer DNS servers. You can use DNS Manager only to manage DNS servers running Windows Server operating systems. The console cannot be used to manage other DNS servers, such as BIND servers.


DNS Quiz Questions.

  1. Soccer Goals Company, with offices in 4 states, has been acquired by Soccer Equipment Enterprises, which has offices in 14 states and is a highly diversified organization. Although the various companies are managed independently, the parent company is very interested in minimizing costs by taking advantage of any shared corporate resources; it also wants to have overall central control. This means that you, the network administrator for Soccer Goals Company, will manage your own DNS namespace but will still be under the umbrella of the parent organization. Which of the following will best accomplish these goals?

    Have each location, including yours, register its own namespace and manage its DNS system independently.
    Have each location, including yours, register its own namespace and add it on a single DNS server at corporate headquarters to provide name resolution across the enterprise.
    Register a single domain name for Soccer Equipment Enterprises and use delegated subdomains on DNS servers installed at each location to provide name resolution across the enterprise.
    Register a single domain name for Roadrunner Enterprises and use delegated subdomains on a single DNS server at corporate headquarters to provide name resolution across the enterprise.


  2. A DNS client sends a recursive query to its local DNS server, asking for the IP address of www.PCTechStream.com. The DNS server finds no local zones corresponding to the requested domain name, so it sends a request to a root name server. What does the root name server reply with?

    The IP address of the name server for the PCTechStream.com domain.
    The IP address of the name server for the .com top-level domain.
    The DNS name of the .com top-level domain.
    The IP address of www.PCTechStream.com.


  3. You have a private network that contains several DNS zones and servers, including a couple of root name servers. You never need to change any of your DNS data. You find that the load on one of your name servers is inordinately high. What can you do to reduce this load?

    Increase the TTL on the affected name server.
    Decrease the TTL on the affected name server.
    Add a service record to the affected name server.


  4. A spammer is attempting to send junk mail through an unsuspecting mail server. The spammer uses a fake DNS name from which they think the mail server will accept mail, but the mail is rejected anyway. How does the mail server know to reject the spammer's mail?

    The spammer's DNS name is not in the cache file of the primary DNS server that serves the mail server's domain, so it gets rejected.
    A fake DNS name is automatically detected if the IP address isn't recognized by the mail server.
    The spammer does not have an MX record in the database of the DNS server that serves the mail server's domain.
    The mail server employs a reverse lookup zone to verify that DNS names are not fake.


  5. Your web server's hostname within the LAN is DC.PCTS.com. However, you need to add a DNS entry so that it can be found with the name www.PCTS.com What type of record should you add to the DNS zone for PCTS.com in order for this to be configured properly?

  06 - Creating a new DNS domain - Moving host and pointer records from parent to child DNS domain - Changing the client's default DNS server and IP address - Configuring the client with the new primary DNS suffix


  07 - Setting up the third DNS server computer - Creating a new delegated domain name - Connecting to the 3rd new DNS server from the DNS manager - Adding the third DNS server to the DNS servers list

07 - DNS Diagram Tutorial


  08 - Testing the new DNS configuration settings in a Windows 7 client computer - Troubleshooting the Nslookup "unknown" response for the default DNS server name - Creating the first DNS forwarder


  09 - Configuring the new fourth Caching-only DNS server - Diagram/Explanation to illustrate Caching-only DNS - Connecting to the DNS-CACHE server from the DNS manager - Setting up new IP addresses in the forwarders tab


  10 - Configuring two public DNS and Web server to host a new Website - Diagram/Explanation to illustrate Web Hosting - Creating forward lookup zones for a new master DNS database server







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