Abstract: Wireless computer network that associates two or more devices using a wireless distribution method often using spread-spectrum or OFDM within a limited zone such as a campus or small building. IEEE 802.11 agrees for fragmentation tuning and rate selection to attain highest throughput. Fragmentation is the procedure by which 802.11 frames are divided into smaller fragments that are transmitted independently to the destination. The aim of this study is to study the performance of IEEE 802.11 of throughput and packet delay by using two types of algorithms, i.e., Constant contention window and binary exponential back-off.