What's new in Cisco Packet Tracer 7.3 ?
Packet Tracer 7.3 main new feature is the support of the CCNA 7 package which is not compatible with previous Packet Tracer versions. For CCNA 6 (and older versions), Cisco recommends instructors and students to stay with Packet Tracer 7.2.2. Students learning both CCNA 6 and 7 should use Packet Tracer 7.3.0.
Packet Tracer 7.3 workspace improvements :
New workspace themes
Aligned workspace objects
Ability to deploy network devices to a specific rack
Accessibility update
Ability to name a physical rack
Protocol and software improvements :
IP OSPF Point-to-Point on Ethernet interface
IPv6 OSPF Point-to-Point on Ethernet interface
Dynamic ARP inspection
WLC GUI fixes and enhancements
DHCP snooping fixes and enhancements
Section output modifier for show commands
Accessibility, security, and usability enhancements and optimizations for all platforms
Upgraded PTSA and PTMO support
Various enhancements to existing protocols
New devices in Packet Tracer 7.3 :
Cisco 4331 Integrated Services Router
Cisco Wireless Lan Controller 3504