After concluding the proposed exams they send a printed diploma to your house and best of all - it's free.
Here's a snippet from their site:
Welcome to SMC Networks’ comprehensive e-training for everybody who wants to start networking or expand its networking knowledge. By successfully completing the online examination you will be officially recognized as “SMC Networking Graduate”.
The concept as a self-paced and module based network training course allows for maximum flexibility in terms of time and learning priorities. All modules are self-contained so that networking experts can skip basic modules and focus on the more advanced areas to enhance their knowledge and skills.
The SMC Networks Academy consists of three levels:
This pre-study backgrounder is designed to provide a basic understanding of network concepts and terminology. It covers the first two layers of the OSI reference model, explains the different network components and gives a general overview of Internetworking and the TCP/IP protocol.
The intermediate level focuses mainly on solutions for the networked home and small office, covering topics such as Wireless LAN, VoIP, NAS, IP Camera, unmanaged switches, and the broadband routers. More advanced topics include antenna and VDSL technologies.
This module provides in-depth explanation of advanced Layer 2/3 switching features and products including policy-based networking and IP routing. Furthermore it includes: Link Aggregation, Port Mirroring, VLAN, QoS/ CoS, Spanning Tree, LAN Security, and IP Multicasting.