1.A network administrator wants to control which user hosts can access the network based on their MAC address. What will prevent workstations with unauthorized MAC addresses from connecting to the network through a switch?

　　A: BPDU

　　B: port security

　　C: RSTP

　　D: STP

　　E: VTP

　　F: blocking mode

　　Correct Answers:　B

　　2.Which of the following statements are true regarding the command ip route 172.16.3.0 255.255.255.0 192.168.2.4? (Choose two.)

　　A:The command is used to establish a static route.

　　B:The default administrative distance is used.

　　C:The command is used to configure the default route.

　　D:The subnet mask for the source address is 255.255.255.0.

　　E:The command is used to establish a stub network.

　　Correct Answers:　A, B

　　3.After the show ip route command has been entered, the following routes are displayed. Which route will not be entered into the routing table of a neighboring router?

　　A: R 192.168.8.0/24 [120/1] via 192.168.2.2, 00:00:10, Serial0

　　B: R 192.168.11.0/24 [120/7] via 192.168.9.1, 00:00:03, Serial1

　　C: C 192.168.1.0/24 is directly connected, Ethernet0

　　D: R 192.168.5.0/24 [120/15] via 192.168.2.2, 00:00:10, Serial0

　　Correct Answers:　D

　　4.How will Spanning Tree affect the operation of the network devices shown in the graphic?