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In this article we will create a Frame Relay in GNS3 to learn how to configure Frame-Relay. Note: If you need to revise your Frame Relay knowledge, we recommend you to read our Frame Relay tutorial first. To configure Frame-Relay on R0, R2 and R3 we need to enable Frame-Relay encapsulation and specify a type of LMI (ansi – in this case). Note: Data link connection identifiers (DLCIs) are numbers that refer to paths through the Frame Relay network. By default, Cisco uses Inverse ARP to map remote IP address of the PVC with the DLCI of the local interface as we can see here. The show frame-relay pvc command is used to display the status of all configured connections, traffic statistics, BECN and FECN packets received by the router. Verify that the router and frame relay provider are properly exchanging LMI.Use the command show frame-relay lmi to see the status of this. Local Management Interface (LMI) is a signaling standard protocol used between your router (DTE) and the first Frame Relay switch. LMI includes: + A keepalive mechanism, which verifies that data is flowing + A multicast mechanism, which provides the network server (router) with its local DLCI.
In our example, when HeadQuarter is configured with Frame Relay, it sends an LMI Status Inquiry message to the DCE. Notice that three types of LMI are not compatible with each others so the LMI type must match between the provider Frame Relay switch and the customer DTE device. From Cisco IOS Release 11.2, the router attempts to automatically detect the type of LMI used by the provider switch. Note: LMI is required for Inverse ARP to function because it needs to know that the PVC is up before sending out Inverse ARP Request.
Now you learn most of Frame Relay mentioned in CCNA, some other Frame Relay’s characteristics you should know are mentioned below. High-Level Data Link Control (HDLC): The default encapsulation type for Cisco routers on point-to-point dedicated links and circuit-switched connections. If you want to learn how to configure Frame Relay in GNS3, please read my Frame Relay Lab in GNS3 tutorial. The first command 2950Switch(config-if)#switchport port-security is to enable the port-security in a switch port. In the second command 2950Switch(config-if)#switchport port-security mac-address sticky, we need to know the full syntax of this command is switchport port-security mac-address sticky [MAC]. A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices.
A – Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port security mac-address command.
C – Use the switchport port-security MAC address sticky command on all the switch ports that have end devices connected to them. D – Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security.

B – The interfaces of two OSPF routers connected to the Border router are in the same subnet.
C – The router is actively broadcasting to establish a link to the Frame Relay switch. D – The router is connected to the local Frame Relay switch, but not to the far end device.
Users have been complaining that their Frame Relay connection to the corporate site is very slow. If one of the intermediate Frame Relay switches encounters congestion, it will set the BECN (Backward Error Congestion Notification) bit on packets being returned to the sending device and the FECN (Forward Error Congestion Notification) bit on the packets being sent to the receiving device. A FECN tells the receiving device that the path is congested so that the upper layer protocols should expect some delay. The DE (Discard Eligibility) bit is used to identify less important traffic that can be dropped during periods of congestion. This switch IOS supports VLAN because we can see VLAN 1 in the exhibit -> D is not correct. They just put the INTERFACE VL1 admin down, the vlan 1 is still on the switch, and the switch will be just fine will all ports in vlan 1.
Also answers from question 272 and 274 from ACME are wrong, but i will let you decide what is the right answer :). In this case, VLAN 1 has been shutdown so we can’t remote access to this switch -> B is correct. Q7 is very tricky B is the right answer for what they are saying, but C would be a correct anser if this was a security question. PVC STATUS = INACTIVE means that theres no connection between FR switch and the far end router. PVC Status= Deleted… means that there is a configuration issue on the provider end, most likely nothing is configured on the provider side of the PVC. How can you determine this to be the answer with such limited information from the diagram? B – The interfaces of two OSPF routers connected to the Border router are in the same subnet. I meant the serial interfaces between the OSPF routers are in the same subnet, respectively. Notice that R1 will be Frame-Relay switch in this lab so its interfaces don’t need IP addresses. Notice that Inverse ARP is enabled by default on Cisco routers so we don’t need to type anything to activate it. In practical, the Frame-Relay switch (R1) is placed at the ISP side so its interfaces should be set to DCE. The response from the DCE might be a small Hello message or a full status report about the PVCs in use containing details of all the VCs configured (DLCI 23 & 51).
The output shows the LMI type used by the Frame Relay interface and the counters for the LMI status exchange sequence, including errors such as LMI timeouts.

The former is often used to connect two Cisco routers while the latter is used to connect a Cisco router to a non-Cisco router. If it receives the update from Branch 1 then wouldn’t it need to use the same int to send update to Branch 2?
The STICKY keyword is used to make the MAC address appear in the running configuration and you can save it for later use.
Users on the Holyoke router are unable to access the intranet server attached to interface E0 of the Chicopee router. Which of these statements correctly describes the state of the switch once the boot process has been completed?
BECN is the information sent back to the local router indicating the link to the partner is being congesting. Point-to-Point Protocol (PPP): Provides connections between devices over several types of physical interfaces, such as asynchronous serial, High-Speed Serial Interface (HSS1), ISDN, and synchronous.
If you do not specify any MAC addresses after the STICKY keyword, the switch will dynamically learn the attached MAC Address and place it into your running-configuration. Inspection of the routing table of the Holyoke router shows that an entry for the Chicopee E0 network is missing. Based on the partial output of the Router#show frame relay pvc command shown in the graphic, which output value indicates to the local router that traffic sent to the corporate site is experiencing congestion? I have to first of all give praise to whoever created your theme and second of all to you for writing what i can only describe as an fabulous article. WRONG (since a Hello was received on this interface with no debug indicating timers were mistmatched, we must assume neighbors were formed). Which command will configure the Holyoke router with a path to the intranet server network?
I honestly believe there is a skill to writing articles that only very few posses and honestly you got it. PPP can use either Password Authentication Protocol (PAP) or Challenge Handshake Authentication Protocol (CHAP) for authentication.
The combining of demonstrative and upper-class content is by all odds super rare with the astronomic amount of blogs on the cyberspace. CIR defines how much bandwidth the customer is “guaranteed” during normal network operation. Any data transmitted above this purchased rate (CIR) is available for discard by the network if the network doesn’t have available bandwidth.
Asynchronous Transfer Mode (ATM): International standard for cell relay using fixed-length (53-byte) cells for multiple service types. ATM takes advantage of high-speed transmission media such as E3, T3, and Synchronous Optical Network (SONET).

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