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Domain Name System (DNS)

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The Domain Name System (DNS) is a distributed database system that translates human-readable domain names (e.g., www.example.com) into their corresponding IP addresses (e.g., 192.0.2.0) used by devices to locate resources on the internet or private networks. DNS operates using a hierarchical struct…

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CompTIA Network+ - Domain Name System (DNS) Example Questions

Test your knowledge of Domain Name System (DNS)

Question 1

A large company is unable to resolve internal domain names. You suspect an issue with their DNS server. What should you check first?

Correct Answer: Check if the DNS server service is running

The most effective initial step when diagnosing an internal Domain Name System (DNS) issue is to first check if the DNS server service is running. If it's not running, it cannot resolve domain names. Restarting the Dynamic Host Configuration Protocol (DHCP) server won't necessarily resolve DNS issues, because while DHCP assigns IP addresses, DNS translates domain names to IP addresses, which are two distinct services. Checking if the company's website is up can help diagnose external domain resolution but does not necessarily apply to internal domain names. Also, resetting all client computers is an inefficient first step, as the issue may lie with the DNS server, not the clients.

Question 2

A user is experiencing slow access to resources on the company's network. The network administrator believes it is a DNS issue. How can the administrator check if the DNS resolution is working correctly?

Correct Answer: Use nslookup or dig

The best way to check if the DNS resolution is working correctly is to use server diagnosis tools like nslookup or dig. These commands are used to query Domain Name Servers (DNS) and get DNS details, which can help detect if there are any DNS-related issues. 'Check network adapter properties' is not the correct answer because it does not provide information on DNS resolution. 'Inspect physical connections' is also incorrect because physical connections would affect overall network connectivity rather than specifically causing DNS issues. Lastly, 'Reboot the computer' could help in certain cases with resolving network issues but it doesn't provide the necessary diagnostics for DNS issues specifically.

Question 3

An administrator is configuring a new DNS zone for their company. They need to ensure the zone is highly available and can handle a vast amount of queries. What type of zone should they implement?

Correct Answer: Primary and secondary zones

The setup with Primary and Secondary zones would ensure the highest availability and the ability to handle a large number of queries. In this configuration, the Primary zone holds the master copy of the data, and changes are replicated to the Secondary zone for backup purposes. This allows for data redundancy and load balancing as queries can be spread between the two zones. On the other hand, the Primary zone only and the Secondary zone only setups lack this redundancy and distribution of load. A Stub zone wouldn't be a good fit for handling a large amount of queries because it only contains pointers to the full DNS data, and not the data itself.

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