多选题In JUNOS Software， which three packet elements can be inspected to determine if asession already exists？（）AIP protocolBIP time-to-liveCsource and destination IP addressDsource and destination MAC addressEsource and destination TCP/UDP port
题目
多选题
In JUNOS Software， which three packet elements can be inspected to determine if asession already exists？（）
A
IP protocol
B
IP time-to-live
C
source and destination IP address
D
source and destination MAC address
E
source and destination TCP/UDP port