200 câu hỏi về CCNA - Tiếng anh

1/ What is a PDU? 
a) corruption of a frame during transmission 
b) data reassembled at the destination 
c) retransmitted packets due to lost communication 
d) a layer specific encapsulation 
2/ What is the primary purpose of Layer 4 port assignment? 
a) to identify devices on the local media 
b) to identify the hops between source and destination 
c) to identify to the intermediary devices the best path through the network 
d) to identify the source and destination end devices that are communicating 
e) to identify the processes or services that are communicating within the end devices 
3/ What are two functions of encapsulation? (Choose two.) 
a) tracks delay between end devices 
b) allows modification of the original data before transmission 
c) enables consistent network paths for communication 
d) ensures that data pieces can be directed to the correct receiving end device 
e) identifies pieces of data as part of the same communication 
4/ During the encapsulation process, what occurs at the data link layer? 
a) The physical address is added. 
b) No address is added. 
c) The process port number is added. 
d) The logical address is added.
 Download