cisco labs

Question 1

which commands configures dns on a router

Answer 1

ip domain-lookup
ip name-server ip address of dns(no subnet)

Question 2

where do you set up a management IP on a switch to manage it remotely

Answer 2

vlan of your choice

Question 3

do you need a subnet mask when configuring dns and default gateway

Answer 3

no, not needed

Question 4

can you ping a switch with management ip on a vlan if the vlan interface is down

Answer 4

no, vlan interface has to be up to ping other devices on the network

Question 5

what will happen if an interface connecting two devices has two different speed and duplex settings

Answer 5

the link will remain down despite no shut command on the interfaces

Question 6

if a switch interface connecting a router interface is up but router end is down, what happens to switch interface

Answer 6

the switch interface will remain down until router end interface is up despite no shut command.

Question 7

name two conditions needed for cdp to work in devices

Answer 7

the interface has to be up on both sides
cdp has to be configured on that particular device/interface

Question 8

which command configures cdp globally on a device

Answer 8

cdp run on global configuration and no cdp run to disable cdp

Question 9

which command configures cdp on an interface

Answer 9

cdp enable on that particular interface and no cdp enable to disable

Question 10

which commands refreshes cdp on a device

Answer 10

no cdp run then followed by cdp run

Question 11

which commands factory resets a router or switch

Answer 11

write erase
reload

Question 12

which command configures a router or switch to boot into the rommon prompt

Answer 12

config-register 0x2120

Question 13

which command in rommon mode configures router or switch to ignore startup-config and reboot.

Answer 13

confreg 0x2142
reset

Question 14

which command removes enable secret

Answer 14

no enable secret (do not copy the encrypted or password part)

Question 15

which command enables the router to boot normally using the startup config

Answer 15

config-register 0x2102

Question 16

which command copies running config or startup config to flash memory

Answer 16

copy run flash (remember the names in flash are case sensitive)

Question 17

which command copies start or running configuration to tftp server

Answer 17

copy run/start tftp(you will be required to give the tftp server address and name of the server)

Question 18

how to copy IOS system image from router to tftp server

Answer 18

copy flash tftp
enter source filename
enter address of tftp server
enter destination filename

Question 19

if you delete the system image in flash what will happen during your next boot up

Answer 19

boot will fail and will display a rommon prompt

Question 20

which command deletes the system image contained in flash memory

Answer 20

delete flash:c2900-universalk9-mz.SPA.151-4.M4.bin(name of file name in flash)

Question 21

what is the work of tftpdnld command in rommon mode

Answer 21

used to download and install a new cisco IOS image from the tftp server(you start the download by invoking tftpdnld on rommon, then enter the ip address, subnet mask, default gateway,tftp server address, tftp file then finish with tftpdnld, after the download is complete finish with reset command to exit rommon and boot normally

Question 22

how to use tftp server to upgrade IOS image

Answer 22

copy tftp flash(enter tftp server address and the file to which you want to upgrade to, destination on flash is same as file name)
boot system with old filename in global config
copy run start
reload(upgrade complete)

Question 23

differences between tftp and ftp

Answer 23

ftp uses port 21 while tftp uses port 69
ftp uses username and password for authentication while tftp does not support authentication
ftp encrypts data transfer while tftp does not encrypt data transfer
ftp can recover from errors while transferring while tftp does not have error recovery
ftp supports both ASCII and binary transfer modes while tftp supports only binary transfer mode
ftp supports resuming interrupted transfers while tftp does not support any transfer options