AZ-104 Certification Practice Question #247

Question

You have the Azure virtual machines shown in the following table.

VNET1 is linked to a private DNS zone named contoso.com that contains the records shown in the following table.

You need to ping VM2 from VM1.
Which DNS names can you use to ping VM2?

Accepted Answer

To ping VM2 from VM1 using a DNS name, the DNS name must successfully resolve to VM2's IP address (10.0.0.5). 
- `comp2.contoso.com` is an **A** record that maps directly to VM2's IP, which resolves successfully.
- `comp1.contoso.com` is a **TXT** record. TXT records are informational and do not resolve to IP addresses for network routing.
- `comp3.contoso.com` is a **CNAME** record pointing to `comp1.contoso.com`, which fails to resolve to an IP since its target is a TXT record.
- `comp4.contoso.com` is a **PTR** record, which is used for reverse lookup (mapping IP to name) and cannot be queried for forward name resolution (name to IP) by the client ping utility.

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