ccna 200 301 booksmart trailer english

ccna 200 301 booksmart trailer english.3.1.1 Conflict DomainsAs already mentioned briefly in Chapter 2, punchline is an Ethernet term that describes a specific environment where a device sending packets in this network segment forces other devices in the same physical segment to pay attention to its sending behavior. This is not a good approach, because if two devices in the same physical segment send data at the same time, a conflict (digital signals from two devices colliding on the same cable) will occur and will force both devices to resend data later. Conflicts can have an extremely negative impact on network performance, so you definitely want to avoid them!The scenario described above would typically occur in a hub environment, where all hosts are connected together through a hub, forming a conflict domain and a broadcast domain. Let's then look at one of the issues mentioned in Chapter 2: What is a broadcast domain?3.1.2 Broadcast DomainsWritten Definition: a wide comedian or denotes a group of devices in a network segment that receives all broadcasts sent to this segment.Although a broadcast domain usually represents a boundary separated by a physical medium (such as devices like switches and routers), it can also represent a logical division of a network segment in which all hosts find each other via data link layer (hardware address) broadcasts.These are just the basics; now let's look at the conflict detection mechanisms used in half-duplex Ethernet.3.1.3 CSMA/CDEthernet networks interconnect using CSMA/CD (Carrier Supervised Multiple Access with Conflict Detection), a protocol that enables devices to share bandwidth equally, avoiding the situation where two devices are transmitting data into the network medium at the same time. CSMA/CD was first developed to deal with the occurrence of conflicts, which occur when different devices send data at the same time. Trust me - good conflict management mechanisms are critical because when a device sends data in a CSMA/CD network, all other devices in the network need to accept and check the transmission behavior of that device. Only bridges and routers can effectively prevent data from being replicated across the network!So how does the CSMA/CD protocol actually work? Let's start with Figure 3.1.