Exam AZ-104 topic 5 question 82 discussion

Correct Answer C: comp2.contoso.com only A record: Is used to map a DNS/domain name to an IP Ref:https://www.cloudflare.com/learning/dns/dns-records/dns-a-record/ TXT records in a lot of cases get used to prove ownership of a domain, it has other purposes too. Reference: https://support.google.com/a/answer/2716800?hl=en#:~:text=TXT%20records%20are%20a%20type,and%20to%20ensure%20email%20security. PTR: A Reverse DNS lookup is used by remote hosts to determine who 'owns' an IP address. Reference: https://www.mailenable.com/kb/content/article.asp?ID=ME020206 CNAME records get used to redirect a DNS name or subdomain name to another DNS name or domain name or subdomain name. reference: https://support.dnsimple.com/articles/cname-record/ It would do good to read up on DNS record types and what they are used for, you will be lost if you don't have a basic understanding of it. https://ns1.com/resources/dns-types-records-servers-and-queries DNS is a key component In the IT field. I hope this info will help.

tested this, i say it is C - comp2.contoso.com ONLY. i created each of the records in my Azure DNS zone, a TXT record is not resolvable, an A record is resolvable, the CNAME is pointing to comp1 which again is not resolvable, and the PTR record should be an IP to a name, when i created the PTR record it wanted me to enter a domain name eg. contoso.com, not an IP address but i put the IP address in anyway, and it did not resolve. So i say it is C - comp2 ONLY

it´s C

'I need to ping a VM, I know, I will just consult the DNS records to find out how to do that!' Honestly!! These Questions!!!!! (got to be the most frustrating exam I have done so far!)

C is correct. comp1.contoso.com: TXT record (TXT records are not used for pinging). comp2.contoso.com: A record (A records can be used for pinging, resolves to 10.0.0.5 which is VM2's IP). comp3.contoso.com: CNAME record (CNAME can be used for pinging, points to comp1.contoso.com). comp4.contoso.com: PTR record (PTR records are used for reverse DNS lookups, typically not used for pinging).

C is right

C must be correct. When you ping an IP address, the DNS resolver is not involved. The rest of the choices will require the DNS resolver. BTW the PTR record is wrong. Its value must be domain and not IP.

anybody know why we cant use comp3 ?

A record resolves ip address 10.0.0.5 to comp2.contoso.com. The only other name we could find is a alias name (CNAME) record. But there is no CNAME entries listed for comp2 so C is the answer

C is the answer. https://learn.microsoft.com/en-us/azure/dns/dns-zones-records#record-types Each DNS record has a name and a type. Records are organized into various types according to the data they contain. The most common type is an 'A' record, which maps a name to an IPv4 address.

You can't ping a txt record even if the text in the record is formatted as an IP address Pinging a CNAME that points to a text record has the same result. You can't ping a PTR record Basically you can only ping an A record or a CNAME pointing to an A record (ignoring IP6)

Was in the 09/01/2023 exam

Correct answer schould be Comp2.contoso.com AND Comp3.contoso,com, because comp in the end also resolves to wanted IP. but that aswwr is not there, so only C

C. comp2 only. A record resolves fwd lookup.

Who creates these sorts of answers? Can't get any more wrong!

C Comp 1 - TXT - it's just a text record used for domain validation, and is not used for resolving address Comp2 - A Record - the actual record for IPv4-to-Domain resolution (others are CNAME and AAAA). Comp 3 - CNAME - This is CNAMing to another computer and not Comp2 Comp4 - PTR - this record does not resolve to an IP. It resolves to a domain name. Only correct choice is 'C'

So many people saying B? The question clearly states what you can -ping- VM2 with. Answer is C.