portas de diversos protocolos, permitindo a depuracao de problemas com protocolos que trafeguem em texto (como HTTP, POP, IMAP, SMTP, etc).Sintaxe:$ telnet [host] [porta]Para encerrar uma conexao telnet, utiliza-se a combinacao de teclas Ctrl+].Para sair do modo interativo (shell telnet, com prompt telnet>), utiliza-se o comando quit. 7. tcpdumpFlexivel sniffers para capturar trafego de rede.O formato de arquivo utilizado pelo tcpdump (libpcap)-i <interface>: especifica a interface na qual o tcpdump deve se conectar, ou seja, de onde ele deve capturar trafego.~$ tcpdump -i eth2tcpdump: verbose output suppressed, use -v or -vv for full protocol decodelistening on eth2, link-type EN10MB (Ethernet), capture size 96 bytes19:16:02.386321 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 358227321:358228769, ack 817888255, win 4163, options [nop,nop,TS val 2774418790 ecr 8994875], length 144819:16:02.386432 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 1448:2896, ack 1, win 4163, options [nop,nop,TS val 2774418790 ecr 8994875], length 144819:16:02.386546 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 2896:4344, ack 1, win 4163, options [nop,nop,TS val 2774418790 ecr 8994875], length 144819:16:02.386667 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 4344:5792, ack 1, win 4163, options [nop,nop,TS val 2774418790 ecr 8994875], length 144819:16:02.386791 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 5792:7240, ack 1, win 4163, options [nop,nop,TS val 2774418790 ecr 8994875], length 144819:16:02.386913 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [.], seq 7240:8688, ack 1, win 4163, options [nop,nop,TS val 2774418790 ecr 8994875], length 144819:16:02.387039 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 8688:10136, ack 1, win 4163, options [nop,nop,TS val 2774418790 ecr 8994875], length 144819:16:02.387198 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 10136:11584, ack 1, win 4163, options [nop,nop,TS val 2774418790 ecr 8994875], length 144819:16:02.387286 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 11584:13032, ack 1, win 4163, options [nop,nop,TS val 2774418790 ecr 8994875], length 144819:16:02.387407 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 13032:14480, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 144819:16:02.387532 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 14480:15928, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 144819:16:02.387652 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [.], seq 15928:17376, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 144819:16:02.387776 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 17376:18824, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 144819:16:02.387906 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [.], seq 18824:20272, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 144819:16:02.388025 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 20272:21720, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 144819:16:02.388144 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [.], seq 21720:23168, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 144819:16:02.388273 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [.], seq 23168:24616, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 144819:16:02.388371 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 24616:25816, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 120019:16:02.388386 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 25816:26064, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 24819:16:02.388524 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 26064:27512, ack 1, win 4163, options [nop,nop,TS val 2774418791 ecr 8994875], length 144819:16:02.388647 IP mirror.fis.unb.br.www > pc-dti02.local.33527: Flags [P.], seq 27512:28960,