Internal Internal memory: 512 MB Flash memory: 32 MB Firmware upgradeable Ethernet LAN IEEE 802.3, IEEE 802.3ab, IEEE 802.3u IPv4/IPv6, HTTP, HTTPS, FTP, TFTP, Port 9100, LPD, IPP, Secure-IPP, WS Discovery, IPsec/Firewall, DHCPv6, MLDv1, ICMPv6, Auto-IP, SLP, Telnet, IGMPv2, BOOTP/DHCP, WINS, IP Direct Mode, WS Print, IPX/SPX, AppleTalk, NetWare NDS, Bindery, NDPS, iPrint Ethernet LAN (RJ-45) ports: 1 Black The HP Jetdirect 640n is a reliable print networking device that offers high-speed wired functionality, easy set-up, full manageability, backward compatibility and enterprise-class security features.Print at high speed over gigabit networks.Quickly connect to shared printers and MFPs throughout your office, over a gigabit network.Strengthen your network security and help protect data.Protect your print network with advanced encryption and authentication via IPsec, SNMPv3, Kerberos, 802.1x, SSL/TLS, ACL, PWD protection, and IPP over TLS.Keep track of devices and easily manage you