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单选题
At which of the following layers does the UDP protocol operate?（）
A
Layer 1
B
Layer 4
C
Layer 6
D
Layer 7
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At which of the following layers does the TCP protocol operate?()
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Which of the following is a connectionless transport layer protocol？（）A、 TCPB、 HTTPC、 SMTPD、 UDP
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单选题Which of the following is a reason to block FTP at the corporate firewall?（）A
It does not transfer encrypted files.B
It cannot be tunneled in a VPN.C
It is a deprecated protocol.D
It transmits passwords in clear text
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单选题Which of the following is a disadvantage of using the EIGRP protocol?（）A
It does not scale wellB
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单选题Which of the following OSI model layers is used for logical addressing?（）A
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NetworkD
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考题
多选题Which three of the following protocols will be forwarded to a host specified by the ip helper - address interface configuration command if the configuration has not been modified by the ip forward - protocol udp global con figuration command?（）ABOOTPBTFTPCARPDDNSEproxy - ARPFFTP
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TCPB
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