arp_flashcards

Question 1

[…] allows a device to respond to ARP requests for IP addresses that are not its own.

Answer 1

Proxy ARP

Question 2

Display all IP ARP entries: R1# […]

Answer 2

show ip arp

Question 3

Display all ARP entries: R1# […]

Answer 3

show arp

Question 4

In the output of show arp, what value is displayed in the ‘Type’ column of Ethernet ARP entries?

Answer 4

ARPA

Question 5

In the ARP table of a Cisco IOS device, what does ‘Type: ARPA’ stand for?

Answer 5

Ethernet II (ARPA = Advanced Research Projects Agency, part of American Department of Defense)

Question 6

In Cisco IOS, will a device refresh a host’s ARP entry if it receives a non-ARP message from that host?

Answer 6

No

Question 7

Cisco devices refresh ARP entries when they receive […] messages from a host.

Answer 7

ARP

Question 8

Enable ARP message debugging: R1# […]

Answer 8

debug arp

Question 9

What value in the ARP OPER field indicates an ARP Reply?

Answer 9

2

Question 10

What value in the ARP OPER field indicates an ARP Request?

Answer 10

1

Question 11

What value in the ARP PTYPE field indicates IPv4?

Answer 11

0x0800

Question 12

What value in the ARP HTYPE field indicates Ethernet?

Answer 12

1

Question 13

Before sending an ARP request to learn a MAC address, a Cisco IOS device will create a/an […] entry in the ARP table.

Answer 13

incomplete

Question 14

IPv4/Ethernet ARP messages are […] in length.

Answer 14

28 bytes *not including the Ethernet header/trailer

Question 15

ARP EtherType: […]

Answer 15

0x0806

Question 16

ARP messages are encapsulated directly within […]

Answer 16

Ethernet frames

Question 17

ARP is used to map a known Layer […] address to an unknown Layer […] address.

Answer 17

3 / 2

Question 18

Layer […] deals with indirectly (and directly) connected devices.

Answer 18

3

Question 19

Layer […] deals with directly connected devices.

Answer 19

2

Question 20

Layer […] provides hop-to-hop addressing.

Answer 20

2

Question 21

Layer […] provides end-to-end addressing.

Answer 21

3

Question 22

ARP Request Message: Ethernet header destination MAC: […] ARP message Target Hardware Address: […]

Answer 22

FFFF.FFFF.FFFF / 0000.0000.0000

Question 23

In Cisco IOS, the default ARP timeout is […]

Answer 23

4 hours/240 minutes/14400 seconds

Question 24

Configure the ARP timeout: R1(config-if)# […]

Answer 24

arp timeout seconds

Question 25

Display the ARP table: R1# [...]

Answer 25

show arp

Question 26

Clear dynamic entries from the ARP table: R1# [...]

Answer 26

clear arp

Question 27

View detailed information about an ARP table entry: R1# [...]

Answer 27

show arp ip-address detail

Question 28

Manually configure an Ethernet ARP entry: R1(config)# [...]

Answer 28

arp ip-address mac-address arpa

Question 29

Gratuitous ARP Message: Ethernet header destination MAC: [...] ARP message Target Hardware Address: [...]

Answer 29

FFFF.FFFF.FFFF and FFFF.FFFF.FFFF

Question 30

Will Cisco IOS devices refresh an ARP Table entry if they receive a gratuitous ARP message from the device?

Answer 30

Yes

Question 31

Will Cisco IOS devices create a new ARP Table entry if they receive a gratuitous ARP message?

Answer 31

No

Question 32

A [...] message is an ARP Reply message sent without receiving an ARP Request.

Answer 32

Gratuitous ARP

Question 33

Enable local proxy ARP on an interface: R1(config-if)# [...]

Answer 33

ip local-proxy-arp

Question 34

Enable proxy ARP on an interface: R1(config-if)# [...]

Answer 34

ip proxy-arp

Question 35

Disable proxy ARP globally: R1(config)# [...]

Answer 35

ip arp proxy disable

Question 36

In Cisco IOS, Local Proxy ARP is [enabled/disabled] on interfaces by default.

Answer 36

disabled

Question 37

In Cisco IOS, Proxy ARP is [enabled/disabled] on interfaces by default.

Answer 37

enabled

Question 38

In Cisco IOS, Proxy ARP is globally [enabled/disabled] by default.

Answer 38

enabled