N10-004单项选择题每日一练(2019.01.20)

单项选择题
At which of the following layers does the TCP protocol operate?（）
A.Layer 1
B.Layer 4
C.Layer 6
D.Layer 7
单项选择题
Which of the following attacks occurs when a hijacker intercepts traffic, modifies it, then sends thetraffic?（）
A.DoS
B.Smurf
C.Man-in-the-middle
D.Phishing
单项选择题
A user reports that the wireless network is slow and is able to see and access shared folders that areunknown to the user.Which of the following is the cause of the problem?（）
A.The SSID broadcast is disabled.
B.Wireless router is improperly configured.
C.The user is connecting to the wrong SSID
D.The wireless NIC is defective.
单项选择题
Which of the following WAN technologies uses a telephone cable?（）
A.POTS
B.FDDI
C.SONET
D.Cable modem
单项选择题
Which of the following is a performance optimization technology?（）
A.QoS
B.Trunking
C.Spanning
D.VoIP