The Session Layer

1
The Session Layer

• Shawn Shuoh-Ren Tsai
• Cisco Academy Training Center
• David Ta-Wei Shih
• CGUIC

2
Dialogue Control

• two-way simultaneous communication
• Full-duplex
• collisions can only occur as two messages pass
  each other, and cause confusion in either, or
  both, communicating hosts.
• two-way alternate communication.
• Half-duplex
• each host to take turns

3
Dialogue Separation

• the orderly initiation, termination, and managing
  of communication between two applications.
• Check points
• Send a sync. Message
• perform the following routine
• back up the particular files
• save the network settings
• save the clock settings
• make note of the end point in the conversation

4
Examples of Layer 5 Protocol

• Network file system (NFS)
• AppleTalk Session Protocol (ASP)
• Structured Query Language (SQL)
• Remote Procedure Call (RPC)
• X-Window System
• Digital Network Architecture Session Control
  Protocol (DNA SCP)