多项选择题
Which are valid modes for a switch port used as a VLAN trunk?（）
A.transparent
B.auto
C.on
D.desirable
E.blocking
F.forwarding
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相关考题
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多项选择题
An inbound access list has been configured on a serial interface to deny packet entry for TCP and UDP ports 21, 23 and 25. What types of packets will be permitted by this ACL?（）
A.FTP
B.Telnet
C.SMTP
D.DNS
E.HTTP
F.POP3 -
多项选择题
Given the address 192.168.20.19/28, which of the following are valid host addresses on this subnet?（）
A.192.168.20.29
B.192.168.20.16
C.192.168.20.17
D.192.168.20.31
E.192.168.20.0 -
多项选择题
A national retail chain needs to design an IP addressing scheme to support a nationwide network. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme?（）
A.255.255.255.0
B.255.255.255.128
C.255.255.252.0
D.255.255.255.224
E.255.255.255.192
F.255.255.248.0
