In RSTP, a port in the discarding state neither forwards data frames nor learns MAC addresses. A port in the learning state does not forward data frames but starts learning MAC addresses. Therefore, options A and B are correct, while C and D are incorrect due to misunderstandings of these states .

For first-time configuration of a newly purchased network device, administrators typically use the console port. This direct connection is secure and independent of network configuration, making it suitable for initial setups. Telnet, SNMP, or FTP require prior IP configuration, which is not feasible during the initial setup phase .

The operator between if-match clauses under a node is AND, meaning all conditions must be satisfied.
However, the operator between nodes is OR, meaning a route matching any node will pass the route-policy .

GRE Characteristics
* GRE does not inherently support encryption or authentication. It is a tunneling protocol for encapsulating packets, and data security features must be implemented using other protocols such as IPsec.
* Other correct attributes of GRE include:
* B. Supports multicast transmission.
* C. Acts as a Layer 3 VPN encapsulation technology.
* D. Can work with VPN protocols like IPsec for better security.
HCIP-Datacom-Core Reference
* GRE features and limitations are discussed in VPN encapsulation technology chapters.