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CcndKnowledge » History » Revision 2

Revision 1 (Junxiao Shi, 01/18/2014 10:30 PM) → Revision 2/5 (Junxiao Shi, 06/09/2014 08:24 PM)

# knowledge about ccnd 

 ccnd is the original reference implementation of CCN/NDN architecture, and the only NDN forwarder that has been used with real applications. 

 ## ccnd tables 

 **FIB** is organized as a tree that is stored in a hashtable, and also contains runtime measurement information. 
 **PIT** is stored in a hashtable, where each PIT entry is linked to a FIB entry. 
 See [ccnd FIB and PIT data structure](https://www.dropbox.com/s/ms7hp1zgpfgvyru/ccnd-FIB-PIT_20140118.docx) for details. 

 **ContentStore** is stored in a hashtable, and a skip list maintains a total order over all stored ContentObjects. 
 See [ccnd ContentStore data structure](https://www.dropbox.com/s/0lw5pqno4wjesiv/ccnd-CS_20130703.docx) for details. 

 ## ccnd strategy 

 ccnd has a default forwarding strategy, but it's not easily replaceable. 
 See [[CcndStrategy|ccnd default strategy]].