单项选择题
A.Hosts belonging to DHCP pool 1 and pool 2 will retain their IP settings for 30 hours before theymust renew
B.Hosts will receive IP settings from pool 1 until the addresses run out， and then hosts will receivethe settings from pool 2
C.Hosts in the 10.10.20.0/24 subnet will use 10.10.20.50 as its DNS server
D.DHCP pool 0 needs to have the ip dhcp excluded-address command to exclude the defaultrouter and DNS servers
多项选择题 OnrouterR1，whichthreeofthefollowingprotocolswillbeforwardedtoahostspecifiedbythe"iphelper-address"interfaceconfigurationcommandiftheconfigurationhasnotbeenmodifiedbythe"ipforward-protocoludp"globalconfigurationcommand？（）
多项选择题 Refer to the exhibit. Which two statements are true？（）
单项选择题 Refer to the exhibit. Based upon the information in the exhibit， which statement is true？（）
