Feel free to donate to help support PCTechStream.com Thank you so much to all of those who have contributed!

09 - DNS Tutorial Overview.
Configuring the new fourth Caching-only DNS server
Although all Domain Name System (DNS) servers cache queries that they have resolved, caching-only servers have only one function: they perform queries, cache the answers, and return the results. Caching-only DNS servers are not authoritative for any domains, and the information that they contain is limited to what they cache while they resolve queries.

Diagram/Explanation to illustrate Caching-only DNS
A caching-only DNS server can be useful at a site where DNS functionality is needed locally but it is not desirable—from the administrative perspective—to create a separate domain or zone for that location, such as a branch office. Query-resolution information is obtained over time from other servers as client requests are serviced.

Connecting to the DNS-CACHE server from the DNS manager
Consequently, the peak network traffic between the caching-only server and other DNS servers occurs when the caching-only server is first put into service. However, if you are dealing with a slow-speed, wide area network (WAN) link between sites, this option might be ideal.

Setting up new IP addresses in the forwarders tab
DNS forwarding is the services that you should resort to if you need to speed up the DNS name resolution process. It is very useful in cases when a request for a domain name is sent by the user but the DNS server, responsible for converting the name into its corresponding IP address, can't locate the matching IP address in its cache and its zones of authority. Via the forward-DNS-resolution-request functionality the queries for a specific non-resolvable address can be directed to alternative name servers.


DNS Quiz Questions.

  1. You're visiting PCTechStream.com. You need to check the new videos. You log in to the PCTechStream.com network but you cannot access the database server hosting the tutorials that has the required videos you need to watch. You find that you cannot ping the database server hosting the tutorials by host name but can by IP address. What is the MOST probable cause of this problem?

    The DHCP server is down.
    The print server is down.
    The DNS server is down.
    The remote access server is down.


  2. You work as the LEVEL II Tech at PCTechStream.com. You have been asked to investigate a connectivity issue to the www.PCTechStream.com web site. You try to ping the web site by name but keep receiving a time outs. You verify that the TCP/IP configuration on the local computer is correct and you can successfully ping the default gateway and the web server by using the IP address. Which of the following suggestions is not the probable cause of this problem?

    A. The DHCP is down.
    B. A, D
    C. The DNS server is down.
    D. The router is down.


  3. How can a user access a Web site when his DNS server is down?

    By using Web server's IP address.
    By using Web server's MAC address.
    By using IPSec.


  4. You work as a LEVEL III network Tech at PCTechStream.com. A trainee asks you what might be wrong if you cannot attach to a server using its host name but you can still attach to it using the IP (internet Protocol) address. Why?

    The server has been moved to another subnet.
    The DHCP registration for the server that they are trying to connect to has expired.
    WINS (Windows Internet Name Service) is enabled on the server that they are trying to connect to.
    The server that they are trying to connect to has lost its registration in DNS (Domain Name Service).


  5. You work as a network administrator at PCTS.com. You have removed the DNS server from the network for maintenance purposes. What affect will this have on the workstations in the PCTS.com network?

  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


  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

09 - DNS Diagram Tutorial


  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







< Previous
Next >