cisco ccna lab equipment list 2020

cisco ccna lab equipment list 2020.Be sure to know the terms listed in Table 25.1, as well as LMI and the uses of FECN and BECN. Don't forget to receive regular full status updates from the operator's switch, which contains a list of VCs and the configuration and status of those VCs. It is important to know that DLCIs are used to travel to destinations and that they are only locally relevant: study Figure 25.5 and the discussion in the "DLCI Example" section.Configuring Frame RelayKeep in mind the two Frame Relay encapsulation types: Cisco and IETF, with IETF being used in multi-vendor environments. If you do not configure the LMI type, the Cisco router will automatically detect it. o The commands show interfaces and show frame-relay Imi indicate whether the router sent a status query and whether it received an answer from the carrier switch. Understand how to use the command frame-relay map to resolve Layer 3 addresses to local DLCI,and how to use the parameter broadcast to allow routing updates to be propagated through the VC. Know how to troubleshoot manually resolved VC configurations. Be familiar with how reverse ARP works and how to use the command show frame-relay pvc to view dynamically resolved VCs. know the three states of VCs: active, inactive, and deleted, and how to troubleshoot VCs based on their state.Non-Broadcast Multiple Access EnvironmentsBe sure to familiarize yourself with the connectivity and routing issues that exist in NBMA networks and how to solve horizontal segmentation problems. The recommended solution is to use subinterfaces, where each subinterface is associated with a VC and a subnet. Know how to use the command command show frame-relay pvc to associate a DLCI to a subinterface.25.5 Authentication SummaryFrame Relay uses VCs to provide connectivity. VCs are logical connections between two devices and come in two types: PVCs, which are similar to leased lines, and SVCs, which are similar to circuit-switched calls. the advantage of VCs over leased lines is that it is easy to add new VCs and to adjust the bandwidth allocated to users or applications after the physical connection is laid. When connecting Frame Relay routers in a fully meshed manner, the following formula can be used to calculate the number of connections required: (NX(N-l))/2oThe LMI specifies how the Frame Relay DTE (router) will exchange with the Frame Relay DCE (carrier switch). There are three types of LMI: Gang ofFour, ANSIAnnex D, and ITU-T Q.933Annex AoLMI messages are only transmitted between the two devices (router and Frame Relay switch) and are never forwarded to other devices. By default, LMI messages are sent by the DTE. Cisco routers generate one LMI message every 10 seconds, and one out of every six messages is a full status update. An address is assigned to each VC - DLCIoDLCI also makes sense only locally and can be different in different network segments. Two network segments withDLCI addressing differ, the operator switch will modify the DLCI number in the Frame Relay frame header accordingly. Operators use two methods to transmit Frame Relay frames in their networks.There are a number of parameters that can be used to control the rate and congestion of VCs. CIR is the guaranteed average VC rate; Be is the average rate higher than the CIR that