cisco ccna passing score

cisco ccna passing score.4. Ethernet AddressesWhen passing Ethernet frames between hosts, they rely on the values of the frame's source and destination MAC address fields. The Ethernet address is called a MAC address, which is also fashionably known as an ExtendedUniqueIdentifier (EUI), and is 48 bits long (MAC-48 or EUI.48). There are also MAC addresses that are 64 bits long (MAC-64 or EUI-64), if you count all the MAC addresses specified in the voluminous IEEE802 standard.MAC addresses are usually expressed as hexadecimal numbers, and there are several ways to write them to make them easier to read. The following two writing styles are more commonly used. 01 -23-45-67-89-ab (IEEE802 representation).0123.4567.89ab (Cisco representation)./iiS MAC addresses are divided into 3 types.Broadcast address: The broadcast MAC address is obtained by setting all bits in the destination MAC address field to 1. It is written similarly to FFFF.FFFF. frames with a destination MAC address field value of broadcast address are sent to all devices within the LAN.Multicast address: Frames with a destination MAC address field value of multicast address are sent to all devices belonging to a particular device group.Unicast addresses: each unicast MAC address is attached to the NIC or port of a particular device and consists of two parts20 Chapter 1 Network Protocols and Network Device Basicscomponents. The first part of the unicast MAC address (the first 24 bits of the 48-bit MAC address) contains the Organization Unique Identifier (OUI) assigned to each organization (network equipment vendor). o OUIs are globally unique, and the same organization can apply for multiple OUIs. o For example, Cisco has multiple registered OUIs. o The second part of the unicast MAC address (the last 24 bits of the 48-bit MAC address) can be assigned by each organization. 24 bits) can be assigned by each organization.