单项选择题
A. an OSPF update for network 192.168.0.0/16
B. a static router to network 192.168.10.0/24
C. a static router to network 192.168.10.0/24 with a local serial interface configured as the next hop
D. a RIP update for network 192.168.10.0/24
E. a directly connected interface with an address of 192.168.10.254/24
F. a default route with a next hop address of 192.168.10.1
单项选择题 A receiving host computes the checksum on a frame and determines that the frame is damaged.The frame is then discarded.At which OSI layer did this happen?（）
单项选择题 Given an IP address 172.16.28.252 with a subnet mask of 255.255.240.0, what is the correct network addres?（）
单项选择题 Which command can be used to verify the DLCI destination address in a Frame Relay static configuration?（）