NICs And Ethernet

Question 1

What are NICs?

Answer 1

Network Interface Card
Aka network adaptor
Wired or wireless

Question 2

What are characteristics of the NICs?

Answer 2

Operates at layers 1 and 2
Includes connectors, transceivers, bus interfaces
Contain Mac addresses
Determines when ok to transmit 
Assembles/disassembles frames

Question 3

What is the three tier switching model?

Answer 3

CORE LAYER
\_\_\_\_\_\_\_\_\_\_\_\_\_\_
All about performance
Low latency
Frame forwarding only 

DISTRIBUTION LAYER
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
Routing
Filtering
NAT
Firewall

ACCESS LAYER
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
Access control
Security policy 
Endpoint devices