H12-811_V1.0 Practice Questions

B (Correct) - HTTP: Uses TCP port 80 for web traffic.

C (Correct) - FTP: Uses TCP ports 20/21 for file transfer.

A (Incorrect) - TFTP: Uses UDP port 69, not TCP.

D (Incorrect) - Ping: Uses ICMP, which is neither TCP nor UDP.

Thus, the correct answers are B and

C.  

Comprehensive Explanation: In STP (Spanning Tree Protocol), ports can be in several states, including:

Discarding: The port is not forwarding traffic, either because it is in a blocking state or not participating in active forwarding.

Listening: The port is processing BPDUs and is preparing to transition to either the learning or forwarding state. No data frames are forwarded during this state.

Forwarding: The port is actively forwarding traffic as part of the active network topology.

The " Disabled " state is not part of the STP protocol but rather represents a port that is administratively shut down or not participating in the STP process.

Detailed Explanation:OSPF (Open Shortest Path First) has several key advantages:

It can load balance traffic among equal-cost routes.

OSPF supports hierarchical area structures, allowing for network scalability and reduced routing table sizes.

OSPF supports strong security measures through packet authentication (MD5 or plain text).

It supports Classless Inter-Domain Routing (CIDR), allowing for more efficient IP address allocation and route aggregation.