|  | 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)