Packet Tracer - Examine the ARP Table
Please click here to download topology 5.2.1.7 Packet Tracer - Examine the ARP Table
Topology
Addressing Table
|
Device
|
Interface
|
MAC Address
|
Switch Interface
|
|
Router0
|
Gig0/0
|
0001.6458.2501
|
Gig1/1
|
|
Se0/0/0
|
N/A
|
N/A
|
|
|
Router1
|
Gig0/0
|
00E0.F7B1.8901
|
Gig1/1
|
|
Se0/0/0
|
N/A
|
N/A
|
|
|
10.10.10.2
|
Wireless
|
0060.2F84.4AB6
|
Fa0/2
|
|
10.10.10.3
|
Wireless
|
0060.4706.572B
|
Fa0/2
|
|
172.16.31.2
|
Fa0
|
000C.85CC.1DA7
|
Fa0/1
|
|
172.16.31.3
|
Fa0
|
0060.7036.2849
|
Fa0/2
|
|
172.16.31.4
|
Gig0
|
0002.1640.8D75
|
Fa0/3
|
Objectives
Part 1: Examine an ARP Request
Part 2: Examine a Switch MAC Address
Table
Part 3: Examine the ARP Process in
Remote Communications
Background
This activity is optimized for viewing
PDUs. The devices are already configured. You will gather PDU information in
simulation mode and answer a series of questions about the data you collect.
Part 1: Examine an ARP Request
Step 1:
Generate ARP requests by
pinging 172.16.31.3 from 172.16.31.2.
a.
Click 172.16.31.2 and open the Command
Prompt.
b.
Enter the arp -d command to clear the ARP table.
c.
Enter Simulation mode and enter the command ping 172.16.31.3. Two PDUs will be generated. The ping command cannot complete the ICMP
packet without knowing the MAC address of the destination. So the computer sends
an ARP broadcast frame to find the MAC address of the destination.
d.
Click Capture/Forward once. The ARP PDU moves Switch1 while the ICMP PDU disappears, waiting for the ARP reply.
Open the PDU and record the destination MAC address. Is this address listed in
the table above? _______
e.
Click Capture/Forward to move the PDU to the next device. How many copies
of the PDU did Switch1 make? _______
f.
What is the IP address of the
device that accepted the PDU? ______________
g.
Open the PDU and examine Layer
2. What happened to the source and destination MAC addresses? ____________________________________________________________________________________
h.
Click Capture/Forward until the PDU returns to 172.16.31.2. How many copies of the PDU did the switch make during
the ARP reply? _______
Step 2:
Examine the ARP table.
a.
Note that the ICMP packet
reappears. Open the PDU and examine the MAC addresses. Do the MAC addresses of
the source and destination align with their IP addresses? _______
b.
Switch back to Realtime and the ping completes.
c.
Click 172.16.31.2 and enter the arp
–a command. To what IP address does the MAC address entry correspond?
______________
d.
In general, when does an
end device issue an ARP request?
____________________________________________________________________________________
Part 2: Examine a Switch MAC Address Table
Step 1:
Generate additional traffic to
populate the switch MAC address table.
a.
From 172.16.31.2, enter the ping
172.16.31.4 command.
b.
Click 10.10.10.2 and open the Command
Prompt.
c.
Enter the ping 10.10.10.3 command. How many replies were sent and received?
______________
Step 2:
Examine the MAC address table
on the switches.
a.
Click Switch1and then the CLI
tab. Enter the show mac-address-table
command. Do the entries correspond to those in the table above? _______
b.
Click Switch0, then the CLI
tab. Enter the show mac-address-table
command. Do the entries correspond to those in the table above? _______
c.
Why are two MAC
addresses associated with one port?
____________________________________________________________________________________
Part 3: Examine the ARP Process in Remote Communications
Step 1:
Generate traffic to produce ARP
traffic.
a.
Click 172.16.31.2 and open the Command
Prompt.
b.
Enter the ping 10.10.10.1 command.
c.
Type arp –a. What is the IP address of the new ARP table entry?
______________
d.
Enter arp -d to clear the ARP table and switch to Simulation mode.
e.
Repeat the ping to 10.10.10.1.
How many PDUs appear? _______
f.
Click Capture/Forward. Click the PDU that is now at Switch1. What is the target destination IP destination address of
the ARP request? ______________
g.
The destination IP
address is not 10.10.10.1. Why?
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
Step 2:
Examine the ARP table on
Router1.
a.
Switch to Realtime mode. Click Router1
and then the CLI tab.
b.
Enter privileged EXEC
mode and then the show mac-address-table
command. How many MAC addresses are in the table? Why?
____________________________________________________________________________________
____________________________________________________________________________________
c.
Enter the show arp command. Is there an entry for 172.16.31.2? _______
d.
What happens to the
first ping in a situation where the router responds to the ARP request?
____________________________________________________________________________________
Suggested Scoring Rubric
|
Activity Section
|
Question Location
|
Possible Points
|
Earned Points
|
|
Part
1: Examine an ARP Request
|
Step 1
|
10
|
|
|
Step 2
|
15
|
|
|
|
Part 1 Total
|
25
|
|
|
|
Part
2: Examine a Switch MAC Address Table
|
Step 1
|
5
|
|
|
Step 2
|
20
|
|
|
|
Part 2 Total
|
25
|
|
|
|
Part
3: Examine the ARP Process in Remote Communications
|
Step 1
|
25
|
|
|
Step 2
|
25
|
|
|
|
Part 3 Total
|
50
|
|
|
|
Total Score
|
100
|
|
|
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