cname.example.com is CNAME record.
example.com is A record.
6.7.8.9 is the ip of cname.example.com and example.com
ns1.example.com (1.2.3.4) and ns2.example.com (1.2.3.5) are authoritative dns.

I ping cname.example.com from a win xp shell.
This is wireshark output:

Domain Name System (query)
    [Response In: 4]
    Transaction ID: 0x0002
    Flags: 0x0100 (Standard query)
    Questions: 1
    Answer RRs: 0
    Authority RRs: 0
    Additional RRs: 0
    Queries
        cname.example.com: type A, class IN
            Name: cname.example.com
            Type: A (Host address)
            Class: IN (0x0001)

Domain Name System (response)
    [Request In: 3]