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23 Cards in this Set
- Front
- Back
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Which command displays learned MAC addresses per port on a switch?
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sh mac address-table
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How do you configure port security?
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#int fa 0/0
#switchport port-security [aging, mac-address, maximum, violation] |
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How do you configure port security for 2 sticky mac-addresses? Furthermore the port needs to be disabled if more than two computers connect to this port.
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#switchport port-security mac-address sticky
#switchport port-security maximum 2 #switchport port-security violation shutdown |
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What is a BPDU?
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A Brideg Protocol Data Unit
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What is the make-up of the Bridge ID?
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Bridge Priority + MAC address
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What is Port Cost?
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Port cost determines the best path when multiple liks are used btw. two switches.The cost is determined by the bandwith
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What is the Root Port?
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The root port is the link directly connected to the root bridge or shortest path to the root bridge.
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How to find out, the switch in question is a root bridge?
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#show spanning-tree
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How to change the priority of the switch?
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#spanning-tree vlan1 priority 4096
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List the spanning Tree Port states
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1. Blocking (no forwarding of frames, just listens to BPDUs)
2. Listening (Prepares to forward data frames. Not populating MAC table) 3. Learning (Populating MAC Table) 4. Forwarding 5. Disabled (Not STP enabled, for example by using PortFast) |
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Describe what Spanning Tree does?
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A spanning tree uses the spanning-tree algorithm (STA), which senses that the switch has more than one way to communicate with a node, determines which way is best and blocks out the other path(s). It also keeps track of the other path(s), just in case the primary path is unavailable.
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What is a designated port?
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A designated port is the connection used to send and receive packets on a specific segment. By having only one designated port per segment, all looping issues are resolved.
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How do you enable Port 0/1 - 12 with PortFast most efficiently?
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# int range FastEthernet 0/1 - 12
# spanning-tree portfast |
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What is UplinkFast?
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Allows a switch to find alternative path to the root bridge *before* the primary link fails.
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List two versions of Etherchannel
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Port Aggregation Protocol (Cisco)
Link Aggregation Protocol (IEEE 802.3) |
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What is UplinkFast?
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Allows a switch to find alternate paths to the root bridge *before* the primary link fails
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Which enhancements are included in RSTP?
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UplinkFast, PortFast, BackboneFast
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List two versions of Etherchanel?
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Link Aggregation Protocol (IEEE 802.3ad)
Port Aggregation Protocol (Cisco) |
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How to set a default gateway on a switch
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#ip default-gateway 192.168.1.1
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What is BPDUGard?
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If on a port configured with PortFast a BPDU packet is detected, the port becomes "error disabled".
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What is BPDUFilter?
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If on a Port configured with PortFast a BPDU Packet is detected, to port disables PortFast on the port in question.
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How to enable BPDUFilter?
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#spanning-tree bpdufilter enable
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How to enable UplinkFast?
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#config t
spanning-tree uplinkfast (Global command. Enabled on all ports) |
