Chapter 6: Link Layer and LAN's

Question 1

Link Layer Introduction

Answer 1

• Node -> host and routers
• Links -> communication channels that connect adjacent nodes along communication paths
• Frame -> layer 2 packet frame , encapsulates datagram

Question 2

Link layer transportation analogy

Answer 2

Trip from X to Y
datagram : tourist
communication link : transport segment
link-layer protocol : transport mode
routing algorithm: travel agent

Question 3

Link layer services

Answer 3

• Framing, link access

- Reliable delivery between adjacent nodes