Network and Transport Layers Mini Case Analysis - Chapter 5 Solution

This assignment provides solutions to a chapter 5 mini case study focusing on network and transport layers. The case involves a scenario of a user accessing an article on a website and explores the underlying processes, including how the destination IP address is obtained, the function of TCP, the number of hops involved in the process, the delivery of files, and the prioritization of streaming applications. The solution explains the steps involved in the URL resolution using DNS, the role of TCP in packet delivery, the routing hops, the assembly of packets, and the prioritization of network traffic for streaming applications like GoToMeeting. The assignment provides clear explanations of the answers with supporting justifications.

Running head: CHAPTER 5 MINI CASE: NETWORK AND TRANSPORT LAYERS
CHAPTER 5 MINI CASE: NETWORK AND TRANSPORT LAYERS
Name of student
Name of university
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.

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CHAPTER 5 MINI CASE: NETWORK AND TRANSPORT LAYERS
Answer of question 3:
Answer b: 8 hops
This option has been selected because the hopping initiates from laptop to Wi-Fi
access point then this hop moves from Wi-Fi access point to router 2. Then from router 2, the
message jumps to the router 1, and then to border router in autonomous system C, it then
moves to border router in Autonomous system B. From the autonomous system B, it travels
to the border router in Autonomous system A. From the Autonomous system A, it moves to
the router 2 and ultimately to the destination router 1, from where information would be
accessed.
Answer of question 4:
Answer b: The PDF file is delivered to the browser only after all the frames/packets
have arrived and the TCP has assembled them into a complete message.
This option has been selected because as any application creates the data that has to
be transmitted to any remote application, data is required to be arranged for being sent
through this media in the adaptable pieces. The TCP describes the services that segments the
data from application layer (FitzGerald, Dennis and Durcikova, 2014). It comprises of
encapsulation, which is required on respective pieces of the data. Each of the pieces of
application data needs the headers that has to be included at the transport layer for clear
indicating to which the communication is related with it. At the receiving host, the pieces of
data might be focused to suitable application. These particular pieces are reassembled into the
whole data stream (FitzGerald, Dennis and Durcikova, 2014).
Answer of question 5:
Answer a: RSVP, RTSP, RSVP: GoToMeeting given priority

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CHAPTER 5 MINI CASE: NETWORK AND TRANSPORT LAYERS
This option has been selected because the internet requirement of the streaming
application is most and it needs to provide the real time information to the users for allowing
simplified information sharing.

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CHAPTER 5 MINI CASE: NETWORK AND TRANSPORT LAYERS
References
FitzGerald, J., Dennis, A. and Durcikova, A. (2014). Business data communications and
networking.