Cisco CCNA ICND book (CIsco Press Book)
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| you just unpacked a 2950 from the box what commands are necessary to be able to remotely access the swtich | int vlan1; ip address <addr> <subnet>; ip default-gateway <address>
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| how would you set the speed on interface 15 on a 2950 | int f0/15 speed 100
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| how would you set full duplex on port 20 on a 2950 | int f0/20 duplex full
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| how would you define port security for a particular mac address | int f0/20 switchport port-security mac-address <addr_here>
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| how would you set port security violation of shutdown on port 21 on a 2950 | int f0/21 switchport port-security violation shutdown
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| how would you see a one line status on all of the interfaces on a 2950 | show int status
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| how would you view port security on interface 10 | show port-security interface f0/10
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| how would you erase a startup configuration on a 2950 | erase startup-config
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| how would you view trunking information on a 2950 | show trunk
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| how would you view status information on vlan 14 on a 2950 | show interfaces vlan 14
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| how would you view the mac address table on a 2950 | show mac-address-table dynamic
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| what is the difference between sticky and non sticky port security | sticky the first time a system is plugged it and packets traverse the switch the mac address associated with that system will stick and any other system will in hence be in violation
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| how would you set interface 16 into port-security with a sticky configuration | int f0/16; switchport port-security mac-address sticky
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| root bridge is what | the switch that does all of the forwarding based on election
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| what protocol defines STP | 802.1d
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| the protocol defines the bridge priority field as a N byte field that can contain values of | 2 bytes 0-65535 lower being higher
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| with the STP process what happens once a root has been identified | the other switches stop advertising themselves as root and start advertising the hello sent by the better switch except they will increase the cost
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| how does a switch determine root port | port with the lowest cost
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| what is the cost heirarchy with the new IEEE | 10GB 2; 1GB 4; 100MB 19; 10MB 100
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| what is the default interval for STP on 2950 | 2 seconds
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| what is the max time fror STP | 20 seconds 10 times hello before trying to change STP topology
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| forward delay is what | delay that affects the time involved when an interface changes from blocking to forwarding. A port stays in listening state and then learning state for a number of seconds defined here
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| what happens when a switch no longer hears hellos from the root bridge | after the maxage timer expires the switch will announce itself as the root via hello
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| if you have a situation where you have 3 switches and each are connected to eachother and the connection between 1 and 3 fails what happens | after maxage expires switch 3 starts to announce itself as the root bridge, however, hello are still coming in with switch root as the root bridge with a higher cost as going through switch 2. Switch 3 cedes to swtich 1 and sets the link between 3 and 2
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| how long would it take to converge if you have a three switches each connected to eachother and the link between 1 and 3 fails | 50 seconds because 20 seconds for maxage, then transition from listening to forwarding takes forward delay takes 15 seconds, then forward delay to forwarding takes another 15
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| when a switch precipitates a network change what does it do | after the maxage time runs out it sends a Topology change notification (TCN) BPDU out the other port. Other switch gets it and times out all MAC entries using maxage and forwards TCN BPDU to root switch.
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| by default it takes 50 seconds to converge all the switches if a link goes down what are some of the best ways to decrease the times it takes to go through that process | make use of etherchannel for trunks STP treats the etherchannel as a single interface
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| by default it takes 50 seconds to converge all the switches if a link goes down what are some of the best ways to decrease the times it takes to go through that process | RSTP 802.1w
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