Exhibit
R1# show interfaces gigabitEthernet 0/0
GigabitEthernet0/0 is up, line protocol is up
Hardware is ISR4331-2x1GE, address is aabb.cc00.0100 (bia aabb.cc00.0100)
Internet address is 10.1.1.1/30
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is RJ45
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
12345 packets input, 1234567 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
3456 input errors, 3456 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
12345 packets output, 1234567 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
R1# show interfaces gigabitEthernet 0/0 status
Port Name Status Vlan Duplex Speed Type
Gi0/0 connected 1 Full 100 10/100/1000BaseTX
R1# show running-config interface gigabitEthernet 0/0
Building configuration...
Current configuration : 90 bytes
!
interface GigabitEthernet0/0
ip address 10.1.1.1 255.255.255.252
duplex half
speed 100
end- A
Remove the manual speed and duplex settings on R1's GigabitEthernet0/0 with 'no speed' and 'no duplex' to allow auto-negotiation.
This is correct because the interface was manually set to 100 Mbps half duplex, causing a duplex mismatch with R2's auto-negotiating interface. Removing these settings restores auto-negotiation, which will match R2's settings and establish 1 Gbps full duplex, eliminating CRC errors.
- B
Change the duplex setting to 'full' and speed to '1000' on R1's GigabitEthernet0/0.
Why wrong: This is incorrect because while setting speed 1000 and duplex full would work if R2 were also manually configured, the question states R2 is set to auto. Manually setting speed and duplex on one side while the other side auto-negotiates can still cause a mismatch if the auto side does not match the manual settings correctly. The safer approach is to remove manual settings.
- C
Replace the cable between R1 and R2 with a crossover cable.
Why wrong: This is incorrect because modern Gigabit Ethernet interfaces support Auto-MDIX, which automatically detects and corrects cable type. The issue is not cable type but a speed/duplex mismatch caused by manual configuration.
- D
Configure R2's GigabitEthernet0/0 with 'speed 100' and 'duplex half' to match R1's settings.
Why wrong: This is incorrect because matching the wrong settings would stabilize the link at 100 Mbps half duplex, but the requirement is for 1 Gbps full duplex. This would not resolve the speed/duplex mismatch but would instead lock both sides into suboptimal settings.
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