Cisco Certifications Tutorials

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31 http:\\ciscocertifications.info Router(config-if)# ipx access-group 810 out Extended IPX Access Lists Extended IPX Access Lists can filter based upon: · Source Network/Node · Destination Network/Node · IPX Protocol (SAP, SPX etc) · IPX Socket access-list <number 900-999> <permit/deny> <protocol> <source address> <socket> <desti- nation address> <socket> *Keypoints: If you do not enter the argument "in" or "out" at the end of the access-group command, then "out" is assumed. You can use the "show interface" command to see if an access list has been enabled on a particular interface. The 2 steps to configure and apply a standard access list to an interface are 1) define the access list and its parameters, 2) enable an interface to become part of the access list group. IPX SAP Filters IPX Sap Filters are used to filter out SAP broadcasts. They use the number range 1000-1099. Access-list <number 1000-1099> <permit/deny> <source address> <service type> access-list 1020 permit 3a.0000.0000.0001 0 int e0 ipx input-sap-filter 1020 This would allow only the server on IPX network 3a.0000.0000.0001 to be seen by the outside world. The service type of 0 matches all services. *Keypoints: Know that SAP filters should be placed close to source router. Local Area Networks (LANs) Full-Duplex Ethernet Can provide double the bandwidth of traditional Ethernet, but requires a single workstation on a single switch port, and the NIC must support it. Collision free because there are separate send and receive wires, and only one workstation is on the segment. Half-Duplex Must provide for collision detection, therefore can only use 50% of bandwidth available. Both hosts on either end of a half-duplex communication use the same wire and must wait for one host to complete its transmission be for the other can respond over the same wire. Ethernet networks generally operate using broadcasts. This caused problems in older bus networks due to broadcast storms reducing each client's bandwidth. The CSMA/CD contention method also states that only one node can transmit at the same time so the more nodes the lower the actual effective band- width for each node.