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After HostA pings HostB, which entry will be in the ARP cache of HostA to support this transmission? 

A. Exhibit A 

B. Exhibit B 

C. Exhibit C 

D. Exhibit D 

E. Exhibit E 

F. Exhibit F 



When a host needs to reach a device on another subnet, the ARP cache entry will be that of the Ethernet address of the local router (default gateway) for the physical MAC address. The destination IP address will not change, and will be that of the remote host (HostB). 


8. A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port? 

A. This is a 10 Mb/s switch port. 

B. This is a 100 Mb/s switch port. 

C. This is an Ethernet port operating at half duplex. 

D. This is an Ethernet port operating at full duplex. 

E. This is a port on a network interface card in a PC. 



Modern Ethernet networks built with switches and full-duplex connections no longer utilize CSMA/CD. CSMA/CD is only used in obsolete shared media Ethernet (which uses repeater or hub). 


9. 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. transport 

C. network 

D. data link 

E. physical 



The Data Link layer provides the physical transmission of the data and handles error notification, network topology, and flow control. The Data Link layer formats the message into pieces, each called a data frame, and adds a customized header containing the hardware destination and source address. Protocols Data Unit (PDU) on Datalink layer is called frame. According to this question the frame is damaged and discarded which will happen at the Data Link layer. 


10. Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two.) 

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. 

Answer: AD 

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