Problem 1 Which OSI layer is responsible for the following ? a) Adding a header

Question

Problem 1 Which OSI layer is responsible for the following ? a) Adding a header that includes routing information. b) Combining messages and segments into packets c) Providing mechanical connection to the network d) Determining the best path to route packets e) Providing end-to-end communications with reliable service. 1) Providing node-to-node communications with reliable service. g) Supporting data compression and encryption. h) Enabling the user to access the network, and providing user interfaces and support for services such as email and remote file access and transfer )Transmitting individaal frames from one node to the next Transmitting individual bits from one node to the next Problem 2 Assume six devices are arranged in a mesh topology. How many cables are needed? How many ports are needed for each device? Problem 3 For each of the following four networks, discuss the consequences if a connection fails a. Five devices arranged in a mesh topology b. Five devices arranged in a star topology (not counting the hub) c. Five devices arranged in a bus topology d. Five devices arranged in a ring topology Problem 4 a) Draw a hybrid topology with a star backbone and three ring networks b) Draw a hybrid topology with a ring backbone and two bus networks

Explanation / Answer

PROBLEM 1

a) Adding a header that includes routing information- Network layer

b) Combines messages and segments into packets-Network layer

c) Providing mechanical connection to the network-Physical layer

d) Determing the best path to route packets-Network Layer

e)Providing end-to-end communications with reliable service- Transport layer

f)Providing node-to-node communications with reliable service-Datalink layer

g) supporting data compression and encryption-presentation layer

h) application layer

i) transmitting individual frames from one node to next- data link layer

j)transmitting individual bits from one node to next- phyiscal layer

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