200-301 · Question #398
What is a DNS lookup operation?
The correct answer is D. responds to a request for IP address to domain name resolution to the DNS server. A DNS lookup operation involves a DNS client querying a DNS server to translate a domain name into its corresponding IP address. The DNS server then provides the requested IP address, enabling the client to connect to the desired resource.
Question
What is a DNS lookup operation?
Options
- ADNS server pings the destination to verify that it is available
- Bserves requests over destination port 53
- CDNS server forwards the client to an alternate IP address when the primary IP is down
- Dresponds to a request for IP address to domain name resolution to the DNS server
How the community answered
(40 responses)- A5% (2)
- B3% (1)
- C3% (1)
- D90% (36)
Why each option
A DNS lookup operation involves a DNS client querying a DNS server to translate a domain name into its corresponding IP address. The DNS server then provides the requested IP address, enabling the client to connect to the desired resource.
Pinging a destination to verify availability is an ICMP operation, not a DNS lookup.
While DNS uses port 53, 'serves requests over destination port 53' describes a characteristic of the DNS service, not the lookup operation itself.
Forwarding clients to alternate IP addresses for redundancy or failover is a function of certain network services or load balancers, not the primary definition of a DNS lookup.
A DNS lookup operation fundamentally involves a client sending a request for a domain name, and the DNS server responding with the associated IP address or vice-versa. This process of resolving domain names to IP addresses is the core function of DNS lookups.
Concept tested: DNS name resolution process
Source: https://learn.microsoft.com/en-us/windows-server/networking/dns/what-is-dns
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