NAT, routing, Windows Firewall, multicast. Services and protocols SMTP, NNTP, POP3. PKI: CA, EFS, email encryption, IIS HTTPS. IPSec and VPN (PPTP and L2TP), RADIUS. Active Directory: sites, services, replication, GC, domain groups, the database and LDAP, partitions and replication, integration with DNS and NetBIOS. SQL Server: installation, system and user databases, object types, primary and foreign keys, Query Analyzer, Network Libraries, Enterprise Manager, MSDE, security, database structure and system tables, transactions, locks, logs, database files, backup and restore, replication, monitoring, DTS.