Detailed Explanation:In RSTP, there are three port states: Discarding, Learning, and Forwarding. These states replace the five traditional STP states by combining them to optimize network convergence.

* IP Address Uniqueness on VLANIF Interfaces:Each VLANIF interface represents a different logical interface, often tied to distinct subnets. IP addresses for VLANIF interfaces must be unique on the same switch to prevent address conflicts and routing issues.
* Correct answer:TRUE. The IP addresses of VLANIF interfaces on the same switch must be different.

Detailed Explanation:The ACL (Access Control List) configuration only permits IP address 172.16.105.2. By applying this ACL to the Telnet server, only devices from this IP can establish a Telnet connection, while all others are denied access. (Reference: HCIA-Datacom Training Material, ACLs and Telnet Access Control)

Detailed Explanation:The default Router Dead Interval in OSPF is 40 seconds for broadcast and point-to- point networks. This interval defines the time period a router waits to receive hello packets before declaring a neighbor as down. (Reference: HCIA-Datacom Training Material, OSPF Hello and Dead Intervals)