2 - Icnd2 - Switch Ports And Mgt

Front 1

Switch ports: CLI interface commands to set interface speed and duplex?

Back 1

#speed {10|100|1000}
duplex {half|full}

Front 2

Switch ports: Two CLI commands to show the speed and duplex of an interface

Back 2

#show interfaces
#show interfaces status

Front 3

Switch ports: How to tell if an interface is using autonegotiated speed and duplex?

Back 3

#show interfaces status
autonegotiated settings prefixed with an "a-"

Front 4

Switch ports: If no response to autonegotiation, what is the default duplex setting?

Back 4

Per IEEE:
10 or 100 Mbps default to half-duplex
1 GB default to full duplex

Front 5

Switch ports: What happens if duplex settings do not match?

Back 5

Interface will connect in an up/up state
Poor performance likely

Front 6

Switch Ports: CLI command to determine port-security status

Back 6

show port-security
lists all interfaces that have port-security turned on

Front 7

Switch Ports: 3 possible states when a port-security violation occurs.

Back 7

shutdown (err-disabled state)
restrict(remains connected, increment violoations counter)
protect(remains connected, increment violations counter)

Front 8

Switch ports: CLI command to show port security violations

Back 8

#show port-security interface <interface number>

Front 9

Switch ports: how to take an interface out of err-disabled state?

Back 9

#shutdown
#no shutdown

Front 10

Switch ports: Is trunking allowed on a port after the switchport access vlan x command?

Back 10

Yes. Switchport mode access is required to stop trunking

Front 11

Switch ports: IOS command to show which port a given mac address is on?

Back 11

#show mac address table dynamic address aaaa.bbbb.cccc

Front 12

Switch ports: What is Etherchannel?

Back 12

Etherchannel combines up to 8 parallel segments of equal speed into a single channel.
Avoids need for STP convergence.

Front 13

Switch ports: CLI commands to setup an Etherchannel

Back 13

#interface fa0/1
#channel-group 1 mode on
#interface fa0/2
channel-group 1 mode on
note: both switches must agree on the group number for the channel

Front 14

Switch ports: CLI command for Etherchannel setup - mode options

Back 14

#channel-group <n> mode { on | auto | desirable }
When the "on" keyword is used, if the other switch is not configured correctly, switches will not forward traffic.

Front 15

Switch ports: CLI command to show Etherchannel

Back 15

#show etherchannel <n> summary

Front 16

Switch ports: CLI commands to setup trunking on a Etherchannel

Back 16

The etherchannel is assigned a pseudo-interface Port-Channel<x>, abbreviated Po<x>
#interface Po1
#switchport mode trunk
#switchport trunk encapsulation dot1q

Front 17

Switches: What is the IOS command for setting the configuration register?

Back 17

config-register

Front 18

Switches: What is the default sequence which a router searches for IOS when powering on?

Back 18

Flash, TFTP, ROM (limited version)

Front 19

Switches: What are the three types of banners, and in which order to they display?

Back 19

motd, login, exec

Front 20

Switches: Can a synchronous serial port be used for dial-up communications?

Back 20

Yes

Front 21

Switches: What is the IOS command to specify device and config file used to boot?

Back 21

boot config

Front 22

Switches: How many serial ports are on a Cisco 2501 router?

Back 22

2

Front 23

Switches: Default administrative status for a serial interface, once confgured with ip address, clock rate, etc.

Back 23

It is up, unless a no shutdown is explicit

Front 24

Switches: IOS command to view general information about the router when it reports a problem?

Back 24

#show tech-support

Front 25

Switches: IOS command to view the contents of the boot environment and bootldr environment variables?

Back 25

#show bootvar

Front 26

Switches: IOS command used to view the ReadOnly and the upgrade ROM monitor image versions on the router

Back 26

rommon> showmon

Front 27

Switches: IOS command to view the status of SSH server connections

Back 27

#show ssh

Front 28

Switches: SSH client and server - describe encryption algorithms, login banners, applications supported

Back 28

DES and 3DES
Login banner supported in v.2 only
Execution shell is only application

Front 29

Switches: IOS command used to configure SSH control parameters

Back 29

#ip ssh