Mobile Ad hoc Networks (MANET) has become an exciting and important technology in recent years because of the rapid proliferation of wireless devices. A mobile adhoc network consists of mobile nodes that can move freely in an open environment. Communicating nodes in a Mobile Adhoc Network usually seek the help of other intermediate nodes to establish communication channels. In such an environment, malicious intermediate nodes can be a threat to the security of conversation between mobile nodes. The security experience from the Wired Network world is of little use in Wireless Mobile Ad hoc networks, due to some basic di_erences between the two Networks. Therefore, some novel solutions are required to make Mobile Adhoc Network secure.

1. Mobile Ad-hoc Networks (manet)

2. •MANET is MOBILE AD-HOC NETWORK.
•ADHOC MEANS ‘FOR THIS PURPOSES’.
•MANET IS SELF-CONFIGURING LESS
INFRASTRUCTURE WIRELESS NETWORK
THAT TRANSMITS FROM COMPUTER TO
COMPUTER.
•DEVICES ARE FREE TO MOVE
INDEPENDENTLY.

3. CHARACTERISTICS :-
1. DYNAMIC TOPOLOGY- Topology changes
rapidly and unpredictably
2. POSSIBLY UNITE- directional links
3. CONSTRAINED RESOURCES- battery power
4. WIRELESS TRANSMITTER RANGE- Routers
move randomly free

4. TYPES OF MANET:-
• VEHICULAR ADHOC NETWORK(VANETs)
• INTELLIGENT VEHICULAR ADHOC
NETWORK(INVANETs)
• INTERNET BASED MOBILE ADHOC
NETWORK(IMANETs)

5. ROUTING IN MANET:-
PRO -ACTIVE (TABLE DRIVEN) ROUTING
REACTIVE (ON DEMAND) ROUTING
HYBRID ROUTING (BOTH PROACTIVE AND
REACTIVE)
BACKPRESSURE ROUTING

6. Routing Protocols for MANETs

7. APPLICATION & USES OF MANET:-
MILITARY OR POLICE EXCERICES
DISASTER RELIEF OPERATION
MINE SITE OPERATION
ROBOT DATA ACQUISITOIN
SUITABLE FOR ALL EMERGENCY SITUATIONS

8. ADVANTAGES OF MANET:-
PROVIDE ACCESS TO INFORMATION AND
SERVICES REGARDLESS OF GEOGRAPHIC
AREA
NETWORK CAN BE SETUP AT ANY PLACE AND
AT ANY TIME
WORKS WITHOUT ANY INFRASTRUCTURE
WIRELESS COMMUNICATION
HIGH MOBILITY
SMALL & LIGHT EQUIPMENT

9. DISADVANTAGES OF MANET:-
Limited resources
Limited physical security
Lack of authorization facilities
Security protocols for wired networks
cannot work for ad-hoc network

10. SOME EXAMPLES OF MANET:-
LARGE IT CAMPUS
EMPLOYEES OF COMPANY MOVING WITH IN
A LARGE CAMPUS WITH LAPTOPS &CELL
PHONES
MOVING SOLDIERS WITH WERABLE
COMPUTERS
SHOPPING MALLs, RESTAURANTs , COFFEE
SHOPS CUSTOMERS SPEND PART OF THE DAY
IN A NETWORK WHICH IS MANET NETWORK

11. CONCLUSION:-
THUS FROM ABOVE WE CONCLUDE THAT
MANET IS A WIRELESS NETWORK WITH MANY
ADVANTAGES AND A FEW DISADVATAGES.
MANET HAS MANY TYPES.
MANET ALSO HAS MANY USES
&APPLICATION.

12. REFERENCES:-
[1]. Tomas Krag and Sebastian Büettrich (2004-01-24).
"Wireless Mesh Networking". O'Reilly Wireles dev center.
[2]. H K SONI (2011-03-22). "Ad hoc network". DoS attack
in MANET.
[3]. http://en.wikipedia.org
[4]. http://www.ics.uci.edu/~keldefra/manet.htm
[5]. http://www.wifinotes.com/how-to-setup-ad-hoc-
network.html
[6]. http://www.antd.nist.gov/wahn_mahn.shtml
[7].
http://www.oreillynet.com/pub/a/wireless/2004/01/22/wir
elessmesh.html