DNS Essentials Quiz: Understanding How DNS Works Quiz

1. DNS Basics

   Which component is responsible for translating a domain name, like www.example.com, into its corresponding IP address?

   1. DNS Resolver
   2. DHCP Server
   3. HTTP Proxy
   4. FTP Client
   5. DMS Resolver

2. The Purpose of DNS

   Why do we need DNS when accessing websites by their domain names?

   1. It converts domain names into IP addresses so browsers can locate servers.
   2. It blocks malicious websites automatically.
   3. It compresses web content for faster loading.
   4. It speeds up the internet by caching all images.
   5. It formats data packets for faster transfer.

3. DNS Query Types

   Which type of DNS query asks a DNS server to find out the required information on behalf of the client if it doesn't already have it cached?

   1. Recursive Query
   2. Iterative Query
   3. Reverse Query
   4. Cyclic Query
   5. Resursive Query

4. Host File Fallback

   If you type 'www.testsite.com' into your browser, what does your computer check first before querying a DNS server?

   1. Local Hosts File
   2. Remote DNS Server
   3. ISP Gateway
   4. Root Name Server
   5. Host Directory

5. Root Server Role

   During DNS resolution, which server is contacted after the local DNS resolver cache is empty and before the TLD server?

   1. Root Name Server
   2. Authoritative Nameserver
   3. Secondary DNS Server
   4. ISP Proxy Server
   5. Route Name Server

6. DNS Lookup Path

   In a typical DNS lookup, which order is correct from the initial user request to receiving the IP address?

   1. Client → Resolver → Root Server → TLD Server → Authoritative Nameserver
   2. Client → Authoritative Nameserver → Resolver → Root Server → TLD Server
   3. Client → TLD Server → Resolver → Root Server → Authoritative Nameserver
   4. Client → Resolver → TLD Server → Root Server → Authoritative Nameserver
   5. Client → TLD Server → Root Server → Resolver → Authoritative Nameserver

7. Practical Scenario

   Suppose 'www.myshop.com' points to the IP 192.168.0.50. Which DNS record type would be used to define this mapping?

   1. A Record
   2. MX Record
   3. CNAME Record
   4. NS Record
   5. AA Record

8. Typos and Troubleshooting

   If you mistype a domain, such as 'gogle.com' instead of 'google.com', why might the DNS resolver still attempt to resolve it?

   1. DNS does not check spelling; it resolves any syntactically correct domain name.
   2. DNS only works with popular websites.
   3. DNS servers autocorrect typos by default.
   4. Browsers store only correct domains.
   5. DNS ignores unregistered names.

9. Caching Benefits

   What is the main benefit of DNS caching for end-users?

   1. Faster website loading by avoiding repeated lookups
   2. Support for larger e-mails
   3. Boosting device memory
   4. Encrypting internet traffic
   5. Avoiding webpage formatting errors

10. Authoritative Nameserver

    What is the specific role of an authoritative nameserver in DNS resolution?

    1. It provides the final answer for a specific domain's IP address.
    2. It routes queries between clients and root servers.
    3. It maintains cache for all client lookups globally.
    4. It manages internet bandwidth allocation.
    5. It converts IP addresses back to MAC addresses.