|  | 13.1 | The Session Layer
| 13.1.5 | Layer 5 protocols

Layer 5 has a number of important protocols. You should be able to recognize these protocols when they appear in a login procedure or in an application. Examples of Layer 5 protocols are:

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