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17 Cards in this Set

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  • Back
[101] Describe how a switch decides what to do with a frame it receives.
[101] 1. The switch receives a frame 2. If the frame is broadcast or multicast, it forwards the frame to all ports except the port of origin 3. If there is no matching entry in the bridge table the switch forwards the frame to all ports except the port of origin 4. If there is a matching entry, and it is not the port of origin, it forwards the frame to the correct port 5. Otherwise it filters the frame
[102] How does a switch know which devices are connected to which ports?
[102] It listens to network traffic, and any time it sees a new MAC address it adds an entry in its Bridge Table, or MAC Address Table, associating that address with whatever port the frame was received on
[103] How do switches avoid loops?
[103] The STP, or Spanning Tree Protocol
[104] What commands would you have to enter if you want to log in to a console session on a switch and enter configuration mode?
[104] "enable", "configure terminal"
[105] What command sets the configuration context to consol config mode?
[105] "line con 0"
[106] What is Vty mode, and how do you set the configuration context to edit it?
[106] vty = telnet session. "line vty 0 15"
[107] What sequence of commands would you have to enter if you're already in configuration mode and you want to set port 8 to 100/Full?
[107] "interface fastethernet0/8", "duplex full", "speed 100"
[108] How do you take a port down for management and bring it back up?
[108] "shutdown", and "no shutdown"
[109] How do you set the IP address used for managing a switch remotely?
[109] "interface vlan 1", "ip address", "no shutdown"
[110] How do you set the default gateway for a switch, and what configuration context must you be in?
[110] "ip default-gateway" - it is a global command, so you shouldn't be in any configuration context
[111] What are two commands to show the running config?
[111] "show running-config" and "write terminal"
[112] What are two commands to show the config that will be used the next time the switch restarts?
[112] "show startup-config" and "show config"
[113] How do you save configuration changes made so they are used when the switch restarts?
[113] "copy running-config startup-config"
[114] What is port security? What two methods can be used to set it up?
[114] Port security is used to allow only specific MAC addresses to send traffic on specific ports. Either you can manually tell the switch the MAC address or addresses allowed to send on each port, or you can tell it to save the MAC address of the first frame it receives on the port and allow only that address to send.
[115] How do you enable port security and how do you tell the switch which MAC address is allowed to connect?
[115] First set the port mode to Access (as opposed to trunk) with "switchport mode access", then enable port security with "switchport port-security", then set the allowed MAC address with "switchport port-security mac-address 0200.1111.1111"
[116] What command would be used to tell the switch to use the MAC address of the first frame it receives when configuration port security?
[116] "switchport port-security mac-address sticky"
[117] How can you view the current port security config for a given port (port 13)?
[117] "show port-security interface fastethernet 0/13"