Please help answer these Data Communications Questions ASAP.

QUESTION 18 Match the following to one or more layers of TCP/IP model (use the answers multiple times) Transmission of bits A. Internet Encoding and decoding B. Transport MySeneca C Datalink D. Application Segments exchanges between processes E. Physical URL Frames Router Bluetooth QUESTION 19 Use the diagram below and answer the following questions. Proxy server Client Switch RI ABC web server R2 Proxy server Switch a. How many physical links are there between a client machine and ABC server? b. How many data-link layers are there from the client to the server? c. How many packets are created when a request is sent from the client to the web server? Save Answer QUESTION 20 10 points Write your answer in the space provided. Answer any 2 of the following questions. If you answer more than 2 only the first 2 will be marked. Use proper sentences and grammar. Each question is worth 5 marks. Provide sufficient detail to earn 5 marks. 1. Compare and contrast between the asynchronous and synchronous communication. 2. Explain 2 types of signals and any 2 types of errors that can affect the receiving hosts ability to read the signal correctly. 3. Explain the differences between IPv4 and IPv6 address spaces. 4. If a client/host at Seneca wants to access Google webserver. Explain how the web page request travels down the TCP/IP protocol stack of the client machine. Support your answer with the encapsulation at each layer. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac)