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?（）
A. session
B. network
C. physical
D. data link
E. transport
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Given an IP address 172.16.28.252 with a subnet mask of 255.255.240.0, what is the correct network addres?（）
A. 172.16.16.0
B. 172.16.24.0
C. 172.16.0.0
D. 172.16.28.0 -
单项选择题
Which command can be used to verify the DLCI destination address in a Frame Relay static configuration?（）
A. show frame-relay end-to-end
B. show frame-relay map
C. show frame-relay lmi
D. show frame-relay pvc -
单项选择题
Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）
A. Frame Relay
B. HDLC
C. x.25
D. PPP
