TY - JOUR T1 - Network Security: Internal and External Attacks AU - Sharma, Ujjwal AU - Sharma, Princi AU - Rawal, Vivek AU - Narwal, Priti JO - Journal of Engineering and Applied Sciences VL - 12 IS - 24 SP - 7494 EP - 7500 PY - 2017 DA - 2001/08/19 SN - 1816-949x DO - jeasci.2017.7494.7500 UR - https://makhillpublications.co/view-article.php?doi=jeasci.2017.7494.7500 KW - DDOS KW -SQL injection KW -intrusion prevention system KW -VPN KW -intrusion detection system KW -security AB - Network security is highly needed to protect legitimate files from unauthorized access, misuse, modification, destruction or improper disclosure. Recent activities in the field of cyber world proves that network attacks can cause huge amount of loss to governments, private enterprises and the general public in terms of money, data confidentiality and reputation. There always occurs a collision between the security specialists and the attackers frequently. In this study, we present an overview of different types of network vulnerabilities and brief discussion about preventive measures from such attacks including classification of IDS and IPS. ER -