A server technician is working at one of the company's branch offices. The technician is unable to access a server at the corporate office. The technician receives a "destination host unreachable" when trying to PING the server name. The technician is able to PING the IP address of the server. Which of the following DNS records should the technician check?

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A. A record An A (Address) record maps a hostname to an IPv4 address. If the technician can ping the IP address but not the hostname, it means the IP connectivity is working, but the DNS server is failing to translate the server's name into its correct IP address.

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B. CNAME record A CNAME (Canonical Name) record is an alias for another hostname; while it can be involved in name resolution, the primary record for a host-to-IP mapping is the A record.

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C. PTR record A PTR (Pointer) record performs reverse DNS lookup, mapping an IP address to a hostname, which is not the issue when forward name resolution fails.

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D. MX record An MX (Mail Exchanger) record specifies mail servers for a domain and is irrelevant to resolving a server's hostname for basic connectivity.

A server technician is working at one of the company's branch offices. The technician is unable to access a server at the corporate office. The technician receives a "destination host unreachable" whe

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