DNS Demystified: The Ultimate Domain Name Resolution Quiz Quiz

1. DNS Resolution Start

   Where does the DNS resolution process typically begin when a user types a URL into their browser?

   1. The root DNS server
   2. The user's local DNS resolver (recursive resolver)
   3. The authoritative DNS server for the domain
   4. The browser's cache
   5. The top-level domain (TLD) server

2. Authoritative DNS Servers

   What is the primary role of an authoritative DNS server?

   1. To cache DNS records for faster lookups
   2. To provide the final answer (IP address) for a specific domain
   3. To resolve domain names recursively
   4. To route internet traffic
   5. To manage the root DNS zone

3. DNS Record Types - A Record

   Which DNS record type is used to map a hostname to an IPv4 address?

   1. CNAME record
   2. MX record
   3. A record
   4. AAAA record
   5. PTR record

4. DNS Record Types - AAAA Record

   Which DNS record type is used to map a hostname to an IPv6 address?

   1. CNAME record
   2. MX record
   3. A record
   4. AAAA record
   5. PTR record

5. DNS Caching

   What is the purpose of DNS caching?

   1. To permanently store all DNS records
   2. To reduce the load on authoritative DNS servers and speed up resolution
   3. To encrypt DNS traffic
   4. To prevent DNS spoofing attacks
   5. To automatically update DNS records

6. TTL (Time To Live)

   What does the TTL (Time To Live) value in a DNS record indicate?

   1. The maximum size of the DNS record
   2. The time a DNS record is cached by resolvers
   3. The time it takes for a DNS server to respond to a query
   4. The number of times a DNS query can be forwarded
   5. The expiration date of the domain name

7. Troubleshooting - 'dig' command

   Which command-line tool is commonly used to query DNS servers and diagnose DNS-related issues?

   1. ping
   2. traceroute
   3. dig
   4. nslookup
   5. ifconfig

8. Troubleshooting - DNS Propagation

   After updating a DNS record, what is DNS propagation?

   1. The process of immediately updating all DNS servers globally
   2. The time it takes for the new DNS record to be cached by all resolvers
   3. The process of registering a new domain name
   4. The process of transferring a domain name to a new registrar
   5. The delay before changes appear in DNS records across the internet

9. DNS Security - DNSSEC

   What is DNSSEC and what problem does it address?

   1. A protocol for encrypting DNS queries
   2. A set of DNS record types for handling email
   3. A security extension that adds digital signatures to DNS data to prevent spoofing
   4. A system for load balancing DNS traffic
   5. A method for compressing DNS records

10. CNAME Records and Aliases

    What is the purpose of a CNAME record?

    1. To define the mail server for a domain
    2. To create an alias for a hostname, pointing it to another hostname
    3. To map a hostname to an IPv6 address
    4. To specify the start of authority for a DNS zone
    5. To perform reverse DNS lookups