N10-004单项选择题每日一练(2019.01.12)

单项选择题
Which of the following ports does POP3 services use, by default?（）
A.25
B.110
C.143
D.443
单项选择题
Which of the following is a valid IP address in the public addressing scheme?（）
A.10.20.1.1
B.168.192.10.1
C.233.10.20.1
D.172.20.10.1
单项选择题
On which of the following cables would a technician find a BNC connector installed?（）
A.CAT6
B.RG-6
C.Fiber
D.CAT3
单项选择题
A user plugged a cable between two network jacks that attach to the same switch and caused a broadcast storm.Which of the following would have prevented the broadcast storm?（）
A. Spanning tree
B. VLAN tagging
C. 802.1x
D. Port mirroring
单项选择题
Session affinity is a feature of which of the following devices?（）
A. DNS server
B. DHCP server
C. Load balancer
D. IPS