answer each question in a couple sentences summarizing the answer to the questio
ID: 3880504 • Letter: A
Question
answer each question in a couple sentences summarizing the answer to the question. The overall question has 5 parts (1-5). I give good feedback and thumbs up.
Answer the following questions: 1) What is the different between OSI reference model and TCP/IP protocol stack? 2) What are the advantage of disadvantage of OSI reference model? 3) For a point-to-point link, whether network layer is necessary? 4) What is the different of the error controls performed at data linklayer and transport layer? 5) If each packet has been verified by data link layer in each hop, why does the whole message, consisting of multiple packets, need to be checked again by transport layer?Explanation / Answer
Answer:
Answer 1:
OSI model has 7 layers i.e physical layer, Data link layer, Network layer, Transport layer, session layer, Presentation layer, Application Layer while the TCP/IP has 4 layers i.e. Network layer, Internet layer, Transport Layer, Application Layer.
OSI model follows vertical approach while the TCP/IP uses the vertical approach.
OSI model is the reference model around which the network is built, while the TCP/IP model is the way of implementing the OSI model.
Answer 2:
Advantage:
Disadvantage:
Answer 3:
Point-to-point link uses the data link, which is the second layer in OSI model and it does not need the network layer for functionality because all the packets are sent through the wired connection.
Answer 4:
In data link layer a method to verify the frame when they are transmitted to the media. The receiving side can verify if the received frame they have received damaged on transmit. So if the link layer detects a damaged frame then it is discards the frame and could ask for retransmission
In case of Transport layer when a user is seeing packet to another user and if in between there is a connection loss or the packet is damaged over the transport layer i.e. going form user A to user B it discards the packet and will ask for retransmission of the packet.
Answer 5:
This is because when sending packet, between send and the receiving side there could be a lot of intermediate routers. During the transit there be problem like packets are dropped, packet, get lost, packet loss there original order etc. So that is why packet need to be checked again by transport layer.
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