H12-811_V1.0 Exam Dumps : HCIA-Datacom V1.0 Exam

An access port is a switch port assigned to a single VLAN and used to connect end devices (such as PCs or printers).

Access ports do not send VLAN tags. They remove the VLAN tag before forwarding frames to the connected device because most end devices do not support VLAN tagging.

Option A (Incorrect): Tagged frames are sent only by trunk ports, not access ports.

Option B (Correct): The access port strips the VLAN tag before forwarding the frame to ensure compatibility with non-VLAN-aware devices.

Option C (Incorrect): VLAN tags are not exchanged between inbound and outbound ports.

Option D (Incorrect): The access port does not attach PVID information to the frame when sending it out.

Thus, the correct answer is B.

In Spanning Tree Protocol (STP), Topology Change (TC) BPDUs are used to notify switches about network topology changes.

The Root Bridge generates BPDUs with TC bits set, which are forwarded through the network.

Non-root switches forward these BPDUs through their Designated Ports.

Option A (Incorrect - Root Port): The Root Port receives BPDUs from the Root Bridge but does not forward them.

Option B (Correct - Designated Port): Designated ports are responsible for forwarding BPDUs down the tree towards other switches.

Option C (Incorrect - Backup Port): Backup ports are blocking and do not forward BPDUs.

Option D (Incorrect - Alternate Port): Alternate ports are in a blocking state and do not forward BPDUs.

Thus, the correct answer is B.

Encapsulation is the process of adding headers and trailers to data at each layer of the OSI model as the data moves from the application layer to the physical layer. Decapsulation is the reverse process when data is received. These processes are critical in implementing network communication, ensuring the proper function of protocols, and assisting in locating faults during data transmission. They do not, however, shorten packet length​