OSI stands for open system interconnect.

Routers supports filtering and encapsulation. 

Gateway connects decimal networks LAN. 

Operates on all 7 layers of OSI reference model. 

Protocol conversion from one LAN to another.

Router operates on network layer of OSI reference model.

Router used to connect similar and dissimilar network.

Repeater works in physical layer of OSI reference model. 

Hubs - physical layer 

Bridge - capable to read Mac address of devices. Works on Data Link Layer of OSI reference model. 

Switch - like hub, inteligent, determine source and destination and pass data to only targeted destination. 

Switch can operate on coaxial, UTP, OFC

switch is manageable by SNMP ( SIMPLE NETWORK MANAGEMENT PROTOCOL) 

L2 switch, L3 switch 

What is MAC address?

Describe NIC card

Types of topology 

• Bus
• Ring
• Mesh
• Hybrid 
• Star

Describe LAN, CAN, MAN, WAN. 

LAN - LOCAL AREA NETWORK 

CAN - CAMPUS AREA NETWORK 

MAN - METROPOLITAN  AREA NETWORK 

WAN - WIDE AREA NETWORK (PACKET SWITCHING, CIRCUIT SWITCHING)

What is Point to point networks?