Why do you think OSI 7 layers is important?

• Because it can be used in real world.

• Because it has 7 layers.

• Because it can be used as a reference model

• Because it is very popular

As we know, layer 1 is physical layer and how data is transfered in this layer?

Moreover, give me some layer 1 devices.

• As packets

  routers , switches

• As datagram

  switches , hubs

• As bits

  switches , hubs

• As bits

  hubs , Wireless Access Points

How layer 7 is called in OSI model?

Give some functions of this model.

• Transport Layer

  . switching services

  . session services

• Application Layer

  . logical addressing

  . routing services

• Presentation Layer

  . physical addressing

  . session services

• Application Layer

  . application services

  . Encapsulation and Decapsulation

Which type of network device operates at layer 1 of the OSI model and requires connected devices to operate at half-duplex using CSMA/CD?

• Switch

• Router

• Hub

• Bridge

Which of the following applies to data as it travels from Layer 1 to Layer 7 of the OSI model?

• Tagging

• Encapsulation

  and

  Decapsulation

• Encapsulation

• Decapsulation

Which of the following are the functions of the network layer of the OSI model?

• 1. Encryption and Compression

• 1. Error detection and correction

• 1. Delivery of packet from source to destination

• 1. All of the above

_______ is also termed as a logical address.

• Port Address

• IP Address

• MAC Address

• None of these

15. Which of the following statements correctly describe the process of data encapsulation in the OSI model? (Choose any two)

• 1. The presentation layer translates the data into a common format and performs encryption and compression.

• 1. The physical layer adds the physical address to the data frames and transmits them through the communication media.

• 1. The transport layer splits the data into smaller chunks called segments and adds TCP or UDP header before passing it to the lower layer.

• 1. All of the above statement is correct.

  Answer

  
  

In University of Computer Studies( Thaton ), there are many lab rooms. In this rooms, at least 40 computer are connected as LAN.

So what do you think what devices are used in this room to create a LAN.

• Hubs , Switches

• Bridges , Switches

• Switches

• Routers , Hubs

According to the OSI model, at which of the following layers is data encapsulated into a frame?

• Layer 1

• Layer 2

• Layer 3

• Layer 4