单选题By default, which PPP mechanism does the ERX Edge Router use to monitor the session for a PPP over ATM client?（）ApingBhelloCget requestDecho request
单选题
By default, which PPP mechanism does the ERX Edge Router use to monitor the session for a PPP over ATM client?（）
A
ping
B
hello
C
get request
D
echo request
参考解析
解析：
暂无解析
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