Link Layer 1

Question 1

What are the four types of services the link layer provides?

Answer 1

• Framing
• Link Access
• Reliable Delivery (Retransmission)
• Error Detection and Correction

Question 2

What are the four types of Access Control?

Answer 2

• Random Access Control
• Carrier Sense Multiple Access
• Carrier Sense Multiple Access with Collision Detection
• Turn-Based Access Control

Question 3

What are the main differences between a switch and a router?

Answer 3

• A switch is a layer 2 device
• Switches support broadcasting
• Switches can only send frames between directly connected interfaces
• Routers are network layer devices
• Routers can send datagrams to any host on the internet
• Routers do not support broadcast