unable to start mongod

Good afternoon, I'm following a course on mongoDB created by openclassrooms . However after installing it by link it was not able to use it with the commando mongodb . In effect it tells me that there is a ERROR: dbpath (/data/db) does not exist.

The complete output is:

:~/mongodb-linux-x86_64-ubuntu1604-3.4.3/bin$ mongod
mongod --help for help and startup options
2017-04-06T23:24:30.258+0200 [initandlisten] MongoDB starting : pid=23743 port=27017 dbpath=/data/db 64-bit host=antoine-Inspiron-3543
2017-04-06T23:24:30.258+0200 [initandlisten] db version v2.6.10
2017-04-06T23:24:30.258+0200 [initandlisten] git version: nogitversion
2017-04-06T23:24:30.258+0200 [initandlisten] OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
2017-04-06T23:24:30.258+0200 [initandlisten] build info: Linux lgw01-12 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 BOOST_LIB_VERSION=1_58
2017-04-06T23:24:30.258+0200 [initandlisten] allocator: tcmalloc
2017-04-06T23:24:30.258+0200 [initandlisten] options: {}
2017-04-06T23:24:30.258+0200 [initandlisten] exception in initAndListen: 10296 
*********************************************************************
 ERROR: dbpath (/data/db) does not exist.
 Create this directory or give existing directory in --dbpath.
 See http://dochub.mongodb.org/core/startingandstoppingmongo
*********************************************************************
, terminating
2017-04-06T23:24:30.258+0200 [initandlisten] dbexit: 
2017-04-06T23:24:30.258+0200 [initandlisten] shutdown: going to close listening sockets...
2017-04-06T23:24:30.258+0200 [initandlisten] shutdown: going to flush diaglog...
2017-04-06T23:24:30.258+0200 [initandlisten] shutdown: going to close sockets...
2017-04-06T23:24:30.258+0200 [initandlisten] shutdown: waiting for fs preallocator...
2017-04-06T23:24:30.258+0200 [initandlisten] shutdown: lock for final commit...
2017-04-06T23:24:30.259+0200 [initandlisten] shutdown: final commit...
2017-04-06T23:24:30.259+0200 [initandlisten] shutdown: closing all files...
2017-04-06T23:24:30.259+0200 [initandlisten] closeAllFiles() finished
2017-04-06T23:24:30.259+0200 [initandlisten] dbexit: really exiting now