code: public List<Link> connect(int bandwidth, Switch sw, List<? extends PhysicalElement> pelts) {
          return pelts.stream().map(pe -> connect(bandwidth, sw, pe)).collect(Collectors.toList());
      }
docs: Create connections between a single switch and multiple physical elements
  
  @param bandwidth the maximal bandwidth for the connection
  @param sw        the switch to connect
  @param pelts     a list of physical elements to connect
  @return a list of links