CDP & LLDP

Question 1

What is the MAC address for CDP multicast messages?

Answer 1

0100.0CCC.CCCC

Question 2

T/F: CDP is enabled on all Cisco devices by default

Answer 2

T

Question 3

T/F: When a device receives a CDP message, it processes and discards the message (doesn’t forward)

Answer 3

T

CDP messages are never forwarded. Therefore, only adjacent neighbors can receive CDP messages from a device

Question 4

T/F: When a device receives a CDP message, it forwards the message to other Cisco devices

Answer 4

F

CDP messages are never forwarded. Therefore, only adjacent neighbors can receive CDP messages from a device

Question 5

What is the default CDP message interval?

Answer 5

60 seconds

Question 6

What is the default CDP hold time

Answer 6

180 seconds

If a message isn’t received within this time frame, the neighbor is removed from the CDP table

Question 7

T/F: There are 2 versions of CDP, and the default is V1

Answer 7

F

CDPv2 is the default

Question 8

T/F: There are 2 versions of CDP, and the default is V2

Answer 8

T

CDPv2 is the default

Question 9

Command to show CDP information such as version, holdtime, etc.

Answer 9

sh cdp

Question 10

Command to show CDP neighbor information

Answer 10

sh cdp neighbors

Question 11

Command to show CDP related traffic metrics, including packets I/O, errors, etc.

Answer 11

sh cdp traffic

Question 12

Command to show CDP related information on interfaces

Answer 12

sh cdp interface

Question 13

What command should you use to view the information in a Cisco device’s neighbor table?

Answer 13

sh cdp neighbors

Question 14

Command to show verbose information on CDP neighbors

Answer 14

sh cdp neighbors detail

Question 15

What CDP command should be used to identify a native VLAN mismatch?

Answer 15

sh cdp neighbors detail

Question 16

What CDP command should be used to identify speed/duplex configuration mismatches?

Answer 16

sh cdp neighbors detail

Question 17

What CDP command should be used to view verbose information about one CDP neighbor

Answer 17

sh cdp entry neighbor-hostname

Question 18

What is the output of

sh cdp

Answer 18

Basic CDP information, including timers, version, etc.

Question 19

What is the output of

sh cdp traffic

Answer 19

How many CDP messages have been sent and receives, and errors

Question 20

What is the output of

sh cdp interface

Answer 20

Displays which interfaces CDP is enabled on, and related per-device information

Question 21

What is the output of

sh cdp neighbors

Answer 21

Lists CDP neighbors and basic information about each neighbor, including hostname and what port they are connected to on both sides

Question 22

What is the output of

sh cdp neighbors detail

Answer 22

Lists each CDP neighbor with verbose, detailed information

Question 23

What is the output of

sh cdp entry hostname

Answer 23

Displays the same information as sh cdp neighbors detail, but for only the neighbor with the specified hostname

Question 24

T/F: If running all Cisco devices and CDP use is desired, then configuration is required on each device

Answer 24

F

CDP is configured as necessary by default on all Cisco devices

Question 25

Command to disable CDP on an entire device

Answer 25

from global config mode: no cdp run

Question 26

Command to enable CDP, if it isn't enabled already

Answer 26

from global config mode: cdp run

Question 27

Command to disable CDP on an interface

Answer 27

from interface config mode: no cdp enable

Question 28

Command to enable CDP on an interface, if it isn't already

Answer 28

from interface config mode: cdp enable

Question 29

Command to adjust CDP message timer

Answer 29

from global config mode: **cdp timer** *seconds*

Question 30

Command to adjust CDP holdtime:

Answer 30

from global config mode: **cdp holdtime** *seconds*

Question 31

Command to enable/disable CDP V2

Answer 31

from global config mode: [no] cdp advertise-v2

Question 32

What is the IEEE standard for LLDP

Answer 32

IEEE 802.1AB

Question 33

T/F: LLDP is usually disabled on Cisco devices by default

Answer 33

T

Question 34

T/F: LLDP is usually enabled on Cisco devices by default

Answer 34

F Must be configured for use on Cisco devices

Question 35

What is the multicast MAC address for LLDP

Answer 35

0180.C200.000E

Question 36

T/F: When a device receives an LLDP message, it processes it and discards it

Answer 36

T

Question 37

T/F: When a device receives an LLDP message, it processes it and forwards it

Answer 37

F LLDP messages are discarded after being processed, so that only adjacent neighbors ever receive LLDP messages

Question 38

What is the default message timer for LLDP

Answer 38

30 seconds

Question 39

What is the default hold time for LLDP

Answer 39

120 seconds

Question 40

What is the default re-initialization delay for LLDP

Answer 40

2 seconds

Question 41

What is the purpose of the LLDP re-initialization timer

Answer 41

If LLDP is enabled either globally or on a specific interface, this timer will delay the actual initialization of LLDP. This is to help in cases of flapping, where LLDP is rapidly disabled and re-enabled This is likely not on the CCNA exam

Question 42

T/F: On Cisco devices, LLDP is usually disabled both globally and on each interface

Answer 42

T

Question 43

T/F: On Cisco devices, LLDP is usally enabled globally but disabled on each interface

Answer 43

F LLDP is disabled globally and on each int by default

Question 44

T/F: On Cisco devices, LLDP is usually disabled globally but enabled on each interface

Answer 44

F LLDP is disabled globally and on each int by default

Question 45

What is the command to enable LLDP globally on Cisco devices

Answer 45

lldp run

Question 46

What is the command to enable LLDP on an interface in the transmit direction

Answer 46

From interface config mode: lldp transmit

Question 47

What is the command to enable LLDP on an interface in the receive direction

Answer 47

From interface config mode: lldp receive

Question 48

What is the command to adjust the LLDP message timer

Answer 48

lldp timer

Question 49

What is the command to adjust the LLDP hold timer

Answer 49

lldp holdtime

Question 50

What is the command to adjust the LLDP re-init timer

Answer 50

lldp reinit

Question 51

Command to show basic information about LLDP

Answer 51

sh lldp

Question 52

Command to show LLDP message counters and errors

Answer 52

sh lldp traffic

Question 53

Command to show which interfaces LLDP is operating on (tx or rx)

Answer 53

sh lldp interface

Question 54

Command to list LLDP neighbors and basic info on neighbors

Answer 54

sh lldp neighbors

Question 55

Command to show detailed information about LLDP neighbors

Answer 55

sh lldp neighbors detail

Question 56

Command to show detailed information for a single LLDP neighbor

Answer 56

sh lldp entry

Question 57

What is shown by the following command: sh lldp

Answer 57

Basic LLDP configuration information

Question 58

What is shown by the following command: sh lldp traffic

Answer 58

LLDP message counters, including errors

Question 59

What is shown by the following command: sh lldp interface

Answer 59

Which interfaces LLDP tx/rx is enabled on

Question 60

What is shown by the following command: sh lldp neighbors

Answer 60

LLDP neighbors and basic information about each neighbor

Question 61

What is shown by the following command: sh lldp neighbors detail

Answer 61

Detailed information about each LLDP neighbor

Question 62

What is shown by the following command: sh lldp entry

Answer 62

Detailed information about a single specified LLDP neighbor

Question 63

What command should be used to restore the LLDP hold timer configuration to its default value?

Answer 63

**no lldp holdtime**