Delay tolerant networks (DTNs) allow communication in networks with intermittent connectivity by using a store-carry-forward approach. DTNs employ a set of protocols that store messages during network disconnections and forward them when connectivity is available. They can provide communication even when end-to-end paths do not exist. Key properties of DTNs include high latency, low data rates, disconnection, long queuing delays, short contact ranges, and dynamic topologies. Potential applications of DTNs include telemedicine in remote areas, social networking, communication under censorship, file sharing, and sharing cellular minutes.

1. Advanced Computer Networks
Topic: Delay Tolerant Network
Shashikant V. Athawale
Assistant Professor
Department of Computer Engineering,
AISSMS COE ,Pune

2. Agenda
 What is Delay Tolerant Network.
 Key Properties Of Delay Tolerant Network.
 Characteristics Of Delay Tolerant Network.
 Delay Tolerant Network Architecture
 Delay Tolerant Network Applications

3. What is Delay Tolerant
Network
 Delay-tolerant networking (DTN) is an
approach to computer network which address the
technical issues in heterogeneous net work that
may lack network connectivity.
 Delay tolerant Network is set of protocols act
together performing store carry and forward
communication.

4. Contd..
• Communication is possible even if end-to-
end connectivity is never achievable.
• Exploiting node’s mobility.
• Using store-carry-forward fashion.

5. How Delay tolerant Network
Works

6. Contd..

7. Key Properties Of DTNs
 High Latency
 Low Data Rate
 Disconnection
 Long Queuing Delay
 Short Range Contact
 Dynamic Network Topology

8. Characteristics of DTN.
 Characteristics of DTN
◦ No end-to-end path
◦ Intermittent connectivity
◦ Dynamic topology
◦ Long delay
 DTN routing
◦ Flooding-based: redundancy
◦ Forwarding-based: require topology
information

9. Delay Tolerant Network
Architecture

10. Delay Tolerant Network
Applications
 Telemedicine for Developing
Regions
 DTN-based Social Network Service
 Communication in the Presence of
Oppressive Governments
 File Sharing and Bulk Data Transfer
 Share Air Minutes