$6.$ How does information get passed from one layer to the next in the Internet model?$7.$ What are headers and trailers, and how do they get added and removed?$8.$ What are the concerns of the physical layer in the Internet model?$9.$ What are the responsibilities of the data link layer in the Internet model?$10.$ What are the responsibilities of the network layer in the Internet model?$11.$ What are the responsibilities of the transport layer in the Internet model?$12.$ What is the difference between a port address, a logical address, and a physical address?$13.$ Name some services provided by the application layer in the Internet model$\mathrm{.}14.$ How do the layers of the Internet model correlate to the layers of the OSI model? Part B$1.$ Assume nine devices are arranged in a mesh topology. How many cables are needed?How many ports are needed for each device? $2.$ For each of the following four networks, discuss the consequences if a connection fails.a$.$ Five devices arranged in a mesh topologyb. Five devices arranged in a star topology $($not counting the hub$)$c$.$ Five devices arranged in a bus topologyd. Five devices arranged in a ring topology $3.$ You have two computers connected by an Ethernet hub at home. Is this a LAN, aMAN, or a WAN? Explain your reason. $4.$ Draw a hybrid topology with a star backbone and three ring networks. $5.$ Performance is inversely related to delay. When you use the Internet, which of thefollowing applications are more sensitive to delay?a$.$ Sending an e$-$mailb. Copying a filec. Surfing the Internet $6.$ Match the following to one or more layers of the OSI model:a$.$ Route determinationb. Flow controlc. Interface to transmission mediad. Provides access for the end user $7.$ Match the following to one or more layers of the OSI model:a$.$ Reliable process$-$to$-$process message deliveryb. Route selectionc. Defines framesd. Provides user services such as e$-$mail and file transfere. Transmission of bit stream across physical medium $8.$ Match the following to one or more layers of the OSl model:a$.$ Communicates directly with user's application programb. Error correction and retransmissionc. Mechanical, electrical, and functional interfaced. Responsibility for carrying frames between adjacent nodes $9.$ Match the following to one or more layers of the OSI model:a$.$ Format and code conversion servicesb. Establishes, manages, and terminates sessionsc. Ensures reliable transmission of datad. Log$-$in and log$-$out procedurese. Provides independence from differences in data representation $10.$ Suppose a computer sends a frame to another computer on a bus topology LAN.The physical destination address of the frame is corrupted during the transmission.What happens to the frame? How can the sender be informed about the situation? $11.$ Suppose a computer sends a packet at the network layer to another computersomewhere in the Internet. The logical destination address of the packet is corrupted. What happens to the packet? How can the source computer be informed of the situation? $12.$ Suppose a computer sends a packet at the transport layer to another computersomewhere in the Internet. There is no process with the destination port addressrunning at the destination computer. What will happen? $13.$ If the data link layer can detect errors between hops, why do you think we needanother checking mechanism at the transport layer?