(5) 14. A and B communicate with the same web server at C through a N private ne
ID: 2266188 • Letter: #
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(5) 14. A and B communicate with the same web server at C through a N private network Internet At point 1 response datagrams sent back from C to A and C to B contain (a) different destination IP addresses and the same destination port numbers (b) different destination IP addresses and the same source port numbers (c) different destination IP addresses and different destination port numbers (d) the same destination IP addresses and different destination port numbers (e) the same destination IP addresses and different source port numbers (t) the same destination IP addresses and the same destination port numbers (5) 15. Consider the Ethernet LAN configuration emploving two switches and one hub, shown at right below. Assume that initially both switches routing tables are empty. A frame is transmitted from E to D. Immediately thereafter a frame is transmitted from A to E. The switch and hub ports on which this A to E frame is forwarded are (a) 11,9,7 (b) 11,9,6,7 (c) 4,2,11,9,7 (d) 4,2,11,9,6,7 hub switch switch (f) 11,5,1,9,6,7 (5) 16. A laptop connected to Ethernet sends a DNS request. What is the sequence of packet headers on this request packet as it leaves the laptop (moving left to right starting from the outermost header, i.e., [outermost header, ..., innermost header (a) Ethernet, IP, UDP, DNS (b) DNS, UDP, IP, Ethernet (c) DNS, IP, TCP (d) DNS, IP, TCP, Ethernet (e) Ethernet, IP, TCP, DNS (f) Ethernet, IP, DNSExplanation / Answer
14. Same IP address represents a group of computers the frame from the internet contains the same IP address. The devices in the group are differentiated by their port number therefore the frame C contains different destination port address.
option d is correct
15. switch sends the message to only target comnputer therefore message goes following port 11 and 9 and reaches the hub which sends the message to all the connected devices so it then goes to 6 an 7 both.
therefore option B is correct
16. format is MAC header then IP header then UDP header then DNS section.
option A is correct
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