Chapter 5 Mini Case: Network and Transport Layers

Running head: CHAPTER 5 MINI CASE: NETWORK AND TRANSPORT LAYERS
CHAPTER 5 MINI CASE: NETWORK AND TRANSPORT LAYERS
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Author’s note:

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CHAPTER 5 MINI CASE: NETWORK AND TRANSPORT LAYERS
Answer of question 1:
Answer B: The browser issues a DNS request and passes it to the TCP layer, which
creates a UDP datagram and passes it to the Network layer, which eventually is resolved by a
DNS server. This option has been selected as when any URL has been provided in any
browser, then these stages are followed:
Stage 1: If the requested object is in the browser cache, then move to stage 7.
Stage 2: The DNS lookup to search IP address of server.
Stage 3: The browser starts the TCP connection with server.
Stage 4: The browser sends the HTTP request to server.
Stage 5: The server handles incoming request.
Stage 6: The browser gains HTTP response.
Stage 7: the browser displays HTML content
Stage 8: The client then interacts with the server
Answer of question 2:
Answer A: The packets arrive at the TCP layer with the name of the destination
application because when any user concerns the command, which utilises any TCP/IP
application layer protocol, there are sequences of actions that has been commenced. The
command of the user or the message is allowed to passes through TCP/IP protocol stack on
local system (FitzGerald, Dennis and Durcikova, 2014). Then this message or command is
allowed to pass across network media to all the protocols on remote system. Protocol at
respective layer on sending the host adds the information to original data. The packet is
common information unit, which has been transmitted across this network.