Chapter 9

This article tackles about Ethernet first we must define what is Ethernet it is a family of network technology for local area network that has been commercially introduce in 1980. The characteristics of Ethernet it has a 3 principal categories Ethernet and IEEE 802.3 and 100-Mbps Ethernet lastly 1000-Mbps Ethernet. Through Ethernet the emergence of LAN switches these will help to avoid and manage vast collision of Ethernet based networks. The state of the art gigabit Ethernet by point-to-point topology. Ethernet is defined in the data link layer and physical layer in the physical layer we have the MAC (Media Access Control) it operates in the physical to the lower sublayer of the Datalink layer with its IEEE standard 802.3 its function is data encapsulation and in the upper portion of the datalink layer operates the LLC (Logical Link Control). As this implies limitation of layer 1 that will be aided by layer 2 is that layer 1 cannot communicate with the upper layer, cannot identify devices, only recognize bits, cannot determine the source of destination when multiple devices is transmitting then we have layer 2 functions it can connect to the upper layer via LLC, uses addressing schemes, frames for recognition of bits MAC for transmission. MAC’s further function is we have CSMA/CD or the Carrier Sense Multiple Access with collision Detection this controls access to shared media  then we have Ethernet characteristics which is the Ethernet timing simply means the time taken to travel from sending to receiving. Layer 2 of the Ethernet unicast, multicast and broadcast this are the types of transmission. Then will go to the protocol for addressing we have the Addressing Resolution Protocol (ARP) a critical function in multiple-access networks. ARP enables frames to be sent and removing address mappings and broadcast issue. Now after knowing the process happens in the hardware will go to the physical devices that implement the Ethernet we have switches, UTP, Fiber connector. These are all about the chapter 9 discussion of the CISCO. Thank you for reading my blog.

1.       Ethernet - is a family of computer networking technologies for local area networks (LANs) commercially introduced in 1980. Standardized in IEEE 802.3, Ethernet has largely replaced competing wired LAN technologies.

2.       LLC - Logical Link Control (LLC) data communication protocol layer is the upper sub-layer of the Data Link Layer in the seven-layer OSI reference model.

3.       MAC - data communication protocol sub-layer, also known as the Medium Access Control, is a sublayer of the Data Link Layer specified in the seven-layer OSI model (layer 2)

4.       CSMA/CD - performance by terminating transmission as soon as a collision is detected, thus shortening the time required before a retry can be attempted.

5.       ARP - is a telecommunications protocol used for resolution of network layer addresses into link layer addresses