Section 4: Cisco IOS

Question 1

NX-OS

Answer 1

• Cisco Nexus and MDS data center switch

Question 2

IOS-XR

Answer 2

• NCS
• CRS
• ASR9000
• XR12000

Question 3

IOS-XE

Answer 3

• ASR1000

Question 4

IOS

Answer 4

• remains the OS used on the majority of Cisco enterprise grade network devices
• other OS have been developed for some more recent router and switch platforms

Question 5

What needs to be done before a Cisco device can be connected to over the network?

Answer 5

• assign IP address

Question 6

What console cable is used to directly connect to a Cisco device for initial configuration?

Answer 6

• DB9 (serial) to RJ45
• Called DB9 because 9 pins go into the cable connector
• Requires a USB to Serial adapter in order to connect the DB9 end to the laptop

Question 7

How do you know that you are in user exec mode?

Answer 7

ROUTER>

Question 8

What command allows you to see the available commands?

Answer 8

ROUTER> ?

Question 9

What command enters privileged exec mode?

Answer 9

ROUTER> enable
or
ROUTER> en

Question 10

How do you know you are in privileged exec mode?

Answer 10

ROUTER#

Question 11

What command switches back to user exec mode from privilege exec mode?

Answer 11

ROUTER# disable

Question 12

What command allows you to see all the commands that start with ‘sh’?

Answer 12

ROUTER# sh?

Question 13

How would you show all the possible “show” commands?

Answer 13

ROUTER# sh ? (add a space between ‘sh’ and ‘?’)
or
ROUTER# show ?

Question 14

When you enter “sh run ?”, one of the options is …what does this mean?

Answer 14

• that you could enter “sh run” as a command and that would be complete
• nothing else needs to come after ‘run’ in the command

Question 15

What is the command to get to the global configuration mode?

Answer 15

ROUTER# configure terminal
or
ROUTER# conf t

Question 16

How do you know when you are in global configuration mode?

Answer 16

ROUTER(config)#

- there is (config) in the prompt

Question 17

How do you execute the “show” command in global config mode?

Answer 17

ROUTER(config)# do show

Question 18

What command displays the available interfaces on the router?

Answer 18

ROUTER(config)# do show ip interface brief

Question 19

What command would you enter to configure the interface FastEthernet0/0?

Answer 19

ROUTER(config)# interface fastEthernet 0/0

Question 20

How do you know that you are in Interface Configuration mode?

Answer 20

ROUTER(config-if)#

Question 21

Can you go directly to Interface Configuration mode from user exec mode?

Answer 21

• No, you must first go to the Global Config mode

Question 22

What command shows the enter Router config?

Answer 22

ROUTER# show running-config

Question 23

What command shows the config for the FastEthernet 0/0?

Answer 23

ROUTER# sh run int fast0/0

Question 24

What command shows the the running config starting at “hostname”, and then everything afterwards?

Answer 24

ROUTER# sh run | begin hostname

Question 25

What command shows the lines in the running config that start with the word “interface”?

Answer 25

ROUTER# sh run | in int

- ‘in’ is short for ‘include’

Question 26

What command shows the entire “interface” section in the running config?

Answer 26

ROUTER# sh run | section interface