4.5: Components of LAN (Doshi)

Question 1

OSI Layer and devices

Answer 1

The higher the layer, more intelligent the devices will be.

Question 2

At which OSI layer Hub and repeater operate

Answer 2

Hub & repeater are usually called dumb devices.

They operate at the physical layer or layer 1

Question 3

At which OSI layer switch & bridge operate

Answer 3

Switches and bridges have more capability than hub. They operate at the Datallink layer or layer 2

Question 4

At which OSI layer Routers operate

Answer 4

Routers have more capability than switch & bridge .They operate at the Network layer or layer 3

Question 5

At which OSI layer gateway operate

Answer 5

They operate at the application layer or layer 7. They are the most intelligent device.

Question 6

Repeater

Answer 6

an electronic device that receives a signal and

re-transmits it.

Question 7

what are repeater used for :

Answer 7

Repeaters are used to extend transmissions so that the signal can cover longer distances or be received on the other side of an obstruction

Question 8

Hub roles

Answer 8

Connect many devices together for exchange of data. Hub broadcast message to all connected devices.

Collisions occur commonly in setups using Hubs
HUB cannot learn or store MAC address

Question 9

Switch

Answer 9

Is more advanced/intelligent version of a hub. Switch sends message to only required device.

No collusion occurs in full duplex switch
Switch store MAC addresses in a lookup up table

Question 10

Bridge

Answer 10

contains few ports of LAN connectivity . Has the capacity to store frames and act as storage and forward devices.

Question 11

Router

Answer 11

Connect two separate networks