Exhibit
R1# show interfaces GigabitEthernet0/0
GigabitEthernet0/0 is up, line protocol is up
Hardware is Gigabit Ethernet, address is aaaa.bbbb.cccc (bia aaaa.bbbb.cccc)
Internet address is 192.0.2.1/30
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is SFP
output flow-control is unsupported, input flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:02, 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 2000 bits/sec, 2 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
500 packets input, 45000 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
150 input errors, 150 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
400 packets output, 40000 bytes, 0 underruns
0 output errors, 0 collisions, 2 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 running-config interface GigabitEthernet0/0
Building configuration...
Current configuration : 120 bytes
!
interface GigabitEthernet0/0
ip address 192.0.2.1 255.255.255.252
duplex auto
speed auto
media-type sfp
negotiation auto
end
R1# show interfaces transceiver
Interface Vendor Type Serial Part No. Distance
Gi0/0 Cisco SFP-GE-SX ABC123 SFP-GE-SX 550m
R2 (via show): R2's Gi0/0 is configured with: speed 1000, duplex full- A
Configure speed 1000, duplex full, and no negotiation auto on Gi0/0, then replace the SFP-GE-SX with SFP-GE-L.
This is correct because R1 must match R2's hardcoded 1000/full settings. Disabling auto-negotiation with 'no negotiation auto' ensures no mismatch. The SFP-GE-SX only supports 550m, so replacing it with SFP-GE-L (1000BASE-LX/LH) supports the required 2 km distance.
- B
Configure speed 1000 and duplex full on Gi0/0, then replace the SFP-GE-SX with SFP-GE-SX-MM.
Why wrong: This is incorrect because while the speed and duplex settings are correct, the SFP-GE-SX-MM is a multimode SFP that still only supports up to 550m, not the required 2 km.
- C
Configure speed 100 and duplex full on Gi0/0, then replace the SFP-GE-SX with SFP-GE-L.
Why wrong: This is incorrect because setting speed to 100 would cause a speed mismatch with R2's 1000 Mbps setting, leading to the interface not coming up or further errors.
- D
Configure no negotiation auto on Gi0/0, then replace the SFP-GE-SX with SFP-GE-L.
Why wrong: This is incorrect because disabling auto-negotiation without explicitly setting speed and duplex leaves the interface in a default state that may not match R2's hardcoded 1000/full, causing a duplex mismatch.
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