How does the AR router obtain a DNS address from a carrier

The AR obtains the DNS address from a carrier as follows:
[Huawei] interface dialer 0
[Huawei-Dialer0] ppp ipcp dns admit-any //Configure the AR to receive the DNS server address specified by the remote end.
[Huawei-Dialer0] ppp ipcp dns request //Configure the AR to request the DNS server address specified by the remote end.

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