Ccna Icnd Chapter 1

Front 1

[101] Describe how a switch decides what to do with a frame it receives.

Back 1

[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

Front 2

[102] How does a switch know which devices are connected to which ports?

Back 2

[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

Front 3

[103] How do switches avoid loops?

Back 3

[103] The STP, or Spanning Tree Protocol

Front 4

[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?

Back 4

[104] "enable", "configure terminal"

Front 5

[105] What command sets the configuration context to consol config mode?

Back 5

[105] "line con 0"

Front 6

[106] What is Vty mode, and how do you set the configuration context to edit it?

Back 6

[106] vty = telnet session. "line vty 0 15"

Front 7

[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?

Back 7

[107] "interface fastethernet0/8", "duplex full", "speed 100"

Front 8

[108] How do you take a port down for management and bring it back up?

Back 8

[108] "shutdown", and "no shutdown"

Front 9

[109] How do you set the IP address used for managing a switch remotely?

Back 9

[109] "interface vlan 1", "ip address 10.1.1.1 255.255.255.0", "no shutdown"

Front 10

[110] How do you set the default gateway for a switch, and what configuration context must you be in?

Back 10

[110] "ip default-gateway 10.1.1.2" - it is a global command, so you shouldn't be in any configuration context

Front 11

[111] What are two commands to show the running config?

Back 11

[111] "show running-config" and "write terminal"

Front 12

[112] What are two commands to show the config that will be used the next time the switch restarts?

Back 12

[112] "show startup-config" and "show config"

Front 13

[113] How do you save configuration changes made so they are used when the switch restarts?

Back 13

[113] "copy running-config startup-config"

Front 14

[114] What is port security? What two methods can be used to set it up?

Back 14

[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.

Front 15

[115] How do you enable port security and how do you tell the switch which MAC address is allowed to connect?

Back 15

[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"

Front 16

[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?

Back 16

[116] "switchport port-security mac-address sticky"

Front 17

[117] How can you view the current port security config for a given port (port 13)?

Back 17

[117] "show port-security interface fastethernet 0/13"