Named Data Networking (NDN) is based on the principle of Content-Centric Networking (CCN) that aims to overcome the weaknesses of the current host-based Internet architecture. Like traditional networks, it is identified that NDN is also vulnerable to many security threats including denial-of-service (DoS) or distributed DoS (DDoS) and might offer avenues for new DoS/DDoS attacks. DDoS attacks can be triggered in NDN to exhaust resources within an NDN router or the content producer(s). This survey paper focuses on different types of possible distributed denial-ofservice (DDoS) attacks; in particular, we address Interest flooding, where an adversary with limited resources can implement this attack and significantly impact thenetwork performance and their proposed countermeasures. Keywords:Named Data Networking, Interest flooding, denial-of-service.