Which two statements regarding this switch and its operations are true? (Choose two.)

A switch has just come online and currently has no learned unicast entries in its bridge table.
Which two statements regarding this switch and its operations are true? (Choose two.)

A switch has just come online and currently has no learned unicast entries in its bridge table.
Which two statements regarding this switch and its operations are true? (Choose two.)

A.
All frames received through a switch port will be flooded out all other switch ports belonging to the same VLAN.

B.
All broadcast frames received through a switch port will be flooded out all switch ports, regardless of the VLAN.

C.
The switch will dynamically add MAC entries to the bridge table for the destination MAC address listed in received frames.

D.
The switch will dynamically add MAC entries to the bridge table for the source MAC address listed in received frames.

Explanation:
A transparent bridge is a data-link layer (layer 2) relay device that connects two or more networks or network systems. When a transparent bridge powers up, it automatically begins learning the network topology by examining the media access control (MAC) source address of every incoming packet. The bridge then creates an entry in the forwarding table consisting of the address and associated interface where the packet was received.

More specifically, a transparent bridge performs all of the following actions to learn the network topology:

* LearningThe bridge examines the MAC address of every incoming packet, records the MAC address and associated interface in the forwarding table, and manages the database of MAC addresses and their associated interfaces.
* FloodingWhen a packets destination address does not match any entries in the forwarding table, the bridge transmits (floods) the packet on all bridge interfaces to all network segments except the interface on which the packet was received.
* ForwardingOnce the bridge has learned a packets destination address (that is, has a matching entry in its forwarding table), the bridge uses the associated port and interface information to send the packet toward its destination.
* FilteringIf the bridge detects that a packets source and destination addresses are on the same network segment, it ignores (filters) that packet. Filtering is the process by which the bridge can screen network traffic for certain characteristics and determine whether to forward or discard (drop) that traffic based on user-defined criteria. On E Series routers, filtering criteria can include the MAC source address, MAC destination address, and protocol type.
* AgingWhen a bridge adds a dynamic (learned) MAC address entry to the forwarding table, it assigns an age to the entry. The bridge updates this age each time it receives a packet. To manage MAC entries more efficiently, you can configure an entrys aging time, which is the maximum time that an entry can remain in the forwarding table before it ages out.



Leave a Reply 0

Your email address will not be published. Required fields are marked *