ISO-OSI-layers
Question 1 |
Assume that Source S and Destination D are connected through an intermediate router R. How many times a packet has to visit the network layer and data link layer during a transmission from S to D?
Network layer – 4 times, Data link layer – 4 times | |
Network layer – 4 times, Data link layer – 6 times | |
Network layer – 2 times, Data link layer – 4 times | |
Network layer – 3 times, Data link layer – 4 times |
Question 1 Explanation:
Source and destination are hosts. The hosts have all layers but routers have only 3 layers
i.e physical,data link and network layer. The purpose of routers is to just pass on the packet between hosts or networks.
Therefore ,
Therefore ,
Question 2 |
__________ provide a method to recover data that has been delivered but not get used :
Segmentation | |
Concatenation | |
Translation | |
Synchronization |
Question 2 Explanation:
→ Translation provide a method to recover data that has been delivered but not get used.
→ The presentation layer handles translation, encryption, authentication and compression.
→ The presentation layer is layer 6 and serves as the data translator for the network. It is sometimes called the syntax layer.
→ The presentation layer handles translation, encryption, authentication and compression.
→ The presentation layer is layer 6 and serves as the data translator for the network. It is sometimes called the syntax layer.
Question 3 |
Which layers of the OSI reference model are host-to-host layers ?
Transport, Session, Presentation, Application | |
Network, Transport, Session, Presentation | |
Data-link, Network, Transport, Session | |
Physical, Data-link, Network, Transport |
Question 3 Explanation:
Question 4 |
Which of the OSI layers handles each of the following:
(i) Dividing the transmitted bit stream into frames
(ii) Determining which route through the subnet to use
(i) Data link layer. (ii) network layer | |
(i) Data link layer. (ii) transport layer | |
(i) session layer. (ii) network layer | |
(i) physical layer. (ii) MAC layer |
Question 4 Explanation:
Dividing the transmitted bit stream into frames is called framing and framing is one by Data link layer.
Determining which route through the subnet to use is called switching and it is done by network layer
Determining which route through the subnet to use is called switching and it is done by network layer
There are 4 questions to complete.