在PPP网络中，两台路由器通过串口相连，配置接口如下所示。以下关于该配置的描述，正确的是哪些项？(多选题)[R1]aaa
[R1-aaa]local-user huawei password cipher huawei123
[R1-aaa]local-user huawei service-type ppp
[R1]interface Serial 1/0/0
[R1-Serial1/0/0]link-protocol ppp
[R1-Serial1/0/0]ppp authentication-mode chap
[R2]interface Serial 1/0/0
[R2-Serial1/0/0]link-protocol ppp
[R2-Serial1/0/0]ppp chap user huawei
[R2-Serial1/0/0]ppp chap password cipher huawei1234()
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