GET ftp://ftp:@ftp.prenhall.com/pub/esm/computer_science.s-041/stallings/Figures/LAN6e_PDF_Figures/CHAP_2.zip
GET ftp://ftp:@ftp.prenhall.com/pub/esm/computer_science.s-041/stallings/Figures/LAN6e_PDF_Figures/CHAP_3.zip