Certexams.com updated netsim for ccna with the following:
1. Book marking of labs
2. Color coding labs so that a candidate would be able to identify labs that had been completed, under progress, and to be completed.
3. Progress indicator for a lab, which enables a user to view how much of the lab exercise has been completed and what is remaining.
Download the limited version of the netsim here:
CCNA Labsim
The labsim consists of dozens of exercises that provide handson experience in designing and configuring networks using Cisco routers and switches. Commands like ping, trace route and ipconfig are also supported.