The document discusses Content Centric Networking (CCN), which is a new approach that focuses on disseminating information based on content names rather than network connections. CCN stores mappings between names and data, and replicates data throughout the network to increase efficiency and resilience. CCN uses interest and data packets, and each node has a content store, pending interest table, and forwarding information base. The architecture processes interests by checking local storage and forwarding tables before inserting pending interests.

1. Content Centric Networking
SOK Phearin
MBC Laboratory,
Konkuk University, Seoul

2. Content
 Overview of CCN
 CCN Architecture
 CCN Operation
 References

3. Content Centric Networking
 A new approach to networking that
 enables networks to self-organize and push relevant
content where needed at anywhere, anytime, and
with any devices
 makes the name and attributes of content the
principle objects upon which the network acts
 Focus on dissemination of information, not on the
maintenance of network connections

4. Content Centric Networking
 Confidentiality, Availability, and Integrity (CIA)
of data
 CCN stores mappings between names and
data items
 Data replication and movement throughout the
CCN to increase efficiency and provide
resiliency to network failures and attacks

5. CCN Architecture: Packets
Interest Data
Content Name Content Name
Signature
Selector
(digest algorithm, witness, ...)
(order
preference, publisher Signed Info
filter, scope, ...) (publisher ID, key locator, stale time,
...)
Nonce Data
 There are just two CCN packet types - interest (similar to
http “get”) and data (similar to http response).
 Both are encoded in an efficient binary XML.

6. CCN Architecture: Node Model
Face 1
Content Store
Wireless
Face 2
Pending Interest
Table (PIT)
CCN Forwarding Wired
Logic
Face 3
Forwarding Information Application
Base (FIB)
CCN Forwarding Engine
Each CCN entity has 3 main data structures
Content Store, Pending Interest Table, Forwarding Information Base
Uses multicast/broadcast
Uses “longest prefix matching” lookup for content names

7. CCN Architecture: Interest Processing
Start
Receive an Interest
Exist in
Content Send data through the arrival face
yes
Store?
No
Exist in Update PIT if request came from
PIT? yes different Face
No
Exist in Send interest over the Faces in FIB
FIB? entry except the arrived Face
yes
No Insert to PIT
Stop

8. CCN Architecture: Interest Processing

9. CCN Operation

10. CCN Operation

11. CCN Operation

12. CCN Operation

13. CCN Operation

14. CCN Operation

15. CCN Operation

16. CCN Operation
 Content goes only where there’s
interest.
 It takes at most one trip across
any link.
 Average latency is minimized.
 Total bandwidth is minimized.
 There’s no routing or control traffic
associated with the replicas.

17. Reference
 http://www.ccnx.org
 http://www.named-data.net

18. Thank You!