Addressing

Switching

Messages are sent over the network of transmission media when a person uses the internet or another computer network from a location other than their immediate area. Switching is the term used to describe this method of moving data between computer networks....

Ethernet

Devices connected to the same Ethernet segment typically use this sort of communication on LAN networks to listen to the network media to determine whether they can transmit or whether they need to wait. Switches allow several devices to access the media simultaneously while hubs only allow one device to broadcast at once. There are three different methods of message transmission in Ethernet communication: Unicast, Multicast, and Broadcast....

Addressing

Physical addresses, which are frequently MAC addresses, are the type of addressing utilized in Ethernet. The address used to transmit frames is this one. Frames are created when packets are received from the network layer. This entails including details like the source and destination MAC addresses....

MAC Address

The MAC address is the address used in Ethernet which is of 48 bits that make up the address and are represented by hexadecimal numerals. When discussing layer 3 addressing, we stated that an IP address is divided into two segments: the network segment and the host segment. A MAC address is also divided into two parts. OUI (Organizational Unique Identifier)  the number is given to the vendor The first 24 bits of the MAC address make up the OUI. Typically, it is the code that the IEEE has assigned to a specific vendor. For instance, the OUI in Cisco switches is typical: 0009.7C The vendor for that specific device often assigns a number to the next 24 bits. It gives the hardware of the device a distinct identity. The complete MAC address is often permanently hard-coded into the switch’s circuitry....

Operation modes in Ethernet

There are two modes of operation for Ethernet networks; the duplex decides whether the communication is unidirectional or bidirectional. There are two duplex modes: Half Duplex and Full Duplex....

MAC Address Table

The routing decisions routers make are based on the data in the routing table. Similarly, the switches include an address database. The MAC-Address table is a database that serves as the foundation for how to switch forward frames. This database is used by the switch to identify the source and destination of frames when communicating. Following are the actions that are conducted when a switch wants to forward a frame....

Configuring the Switch

The many configuration modes included the interface configuration, the global configuration mode, the privileged executive mode, the user executive mode, and several more specific configuration modes. Here, we will set up some of a switch’s fundamental settings, such as:...

Port Security

Switches are susceptible to a variety of attacks, including:...