Refer to the graphic.Host A is communicating with the seiver. What will be the source MAC address of the frames received by Host A from the server?（）

多项选择题Which of the following correctly describe steps in the OSI data encapsulation process?（）

A.The transport layer divides a data stream into segments and may add reliability and flow control information.
B.The data link layer adds physical source and destination addresses and an FCS to the segment.
C.Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information.
D.Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
E.The presentation layer translates bits into voltages for transmission across the physical link.

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

单项选择题A network administrator is verifying the configuration of a newly installed host by establishing an FTP connection to a remote server. What is the highest layer of the protocol stack that the nework administrator is using for this operation?（）

A. application
B. presentation
C. session
D. transport
E. internet
F. data link

单项选择题Refer to the exhibit, Host A pings interface S0 0 on router 3, what is the TTL value for that ping?（）

A. 253
B. 252
C. 255
D. 254

单项选择题Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?（）

A.transport
B.network
C.presentation
D.session
E.application