\documentclass[../review_1.tex]{subfiles}
\graphicspath{{\subfix{../img/}}}
\begin{document}

\chapter{Abkürzungsverzeichnis}\thispagestyle{fancy}
\begin{description}
    \item[DDoS] Distributed Denial-of-Service
    \item[DoS] Denial-of-Service
    \item[DRoS] Distributed Reflected Denial-of-Service
    \item[Gbps] Giga bit pro sekunde
    \item[Mpps] Million packets per second
\end{description}

\end{document}