cisco ccna pearson vue

cisco ccna pearson vue.The LAN switch is a device that can connect multiple workstations in full-duplex mode. In this way, each port of the switch will create a separate conflict field for each of the smart card points, and no conflicts will occur between the workstations connected to it (when transmitting data). In Figure 1.16, for example, the switch is connected to four hosts, each host has a separate channel for sending and receiving data, so that each port of the switch is actually circled a conflict domain. Note that for this case, it does not make any sense to refer to a switch port as a conflict domain. In fact, it can be assumed that there is no conflict domain at all, since no conflict occurs at all.How does the switch forward frames? While the HUB can only replicate the same information through all ports, the switch is much smarter in its operation and forwards the frame to the correct workstation based on the value of the frame's destination MAC address field. A simple example of a switch forwarding a frame is shown in Figure 1-17.1.3 Layer 2 Basics and Technologies 23Figure 1-17 Forwarding a frame with a switchAfter receiving a frame, how does the switch know which port to send it out from? Before explaining this forwarding mechanism of the switch, the following three concepts need to be discussed.The MAC address table: This table holds the correspondence between the MAC address and the physical port of the switch to which the host with that MAC address is attached. A simplified MAC address table is shown in Figure 1.18.0200.1111.1111 F0/10200.3333.3333 F0/3Figure 1-18 Simplified MAC Address TableDynamic MAC address learning: while it is not impossible to manually populate the MAC address table, it is too much of a hassle The dynamic learning mechanism for OMAC addresses is a mechanism that automatically populates the switch MAC address table. When an Ethernet frame is received from a port, the switch records the source MAC address of the frame and inserts a record in the MAC address table that marks this MAC address as learned from that port.