Based on the results of the network test described, at which Layers of the OSI model can be the network be assumed to be operating end$-$to$-$end? L$1=$ Layer $1,$ L$2=$ Layer $2,$ and so on$.$

$\backslash$table$[[$successful ping,L$1,$ L$2,$ L$3,$ L$4],[\backslash$table$[["$show ip int brief $"$ command shows a$],[$port$\text{'}$s status as up$/$up$],[$entering a URL into a browser address bar$],[$returns a web page$]],\backslash$table$[[],[$L$1,$ L$2,$ L$3,$ L$4,$ L$5,$ L$6],[$L$1,$ L$2,$ L$3,$ L$4],[$L$1,$ L$2,$ L$3,$ L$4,$ L$5,$ L$6,$ L$7],[$L$1],[$L$1,$ L$2,$ L$3],[$L$1,$ L$2,$ L$3,$ L$4,$ L$5,$ L$6,$ L$7$ but not necessarily DNS$],[$L$1,$ L$2]]],[\backslash$table$[[$entering an IP address into a browser$],[$address bar returns a web page$]],],[$you are able to $SSH$ into a remote router,$]]$