Exhibit
R1# show interfaces gigabitethernet 0/0
GigabitEthernet0/0 is up, line protocol is down
Hardware is GigabitEthernet, address is aabb.cc00.0100 (bia aabb.cc00.0100)
Description: Link to SW1
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)
Auto-duplex, Auto-speed
input errors: 0 CRC, 0 frame, 0 overrun, 0 ignored
output errors: 0 collisions, 0 interface resets
unknown protocol drops: 0
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
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
0 packets output, 0 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 interfaces gigabitethernet 0/0 transceiver
GigabitEthernet0/0: SFP is not present
R1# show running-config interface gigabitethernet 0/0
Building configuration...
Current configuration : 60 bytes
!
interface GigabitEthernet0/0
description Link to SW1
ip address 192.0.2.1 255.255.255.252
no shutdown
end
R1# show ip interface brief
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 192.0.2.1 YES manual up down
GigabitEthernet0/1 unassigned YES unset administratively down down- A
Set speed 100, duplex full; replace SFP with 1000BASE-LX; use single-mode fiber (SMF).
This is correct because the switch port is manually set to 100 Mbps/full duplex, so R1 must match those settings to avoid a mismatch. CRC errors indicate a duplex mismatch or faulty cabling; after fixing the mismatch, replacing the SFP with 1000BASE-LX (which supports up to 5 km over single-mode fiber) and using SMF resolves the distance requirement.
- B
Set speed 100, duplex half; replace SFP with 1000BASE-SX; use multimode fiber (MMF).
Why wrong: This is incorrect because the switch port is set to full duplex, so setting duplex half on R1 would cause a duplex mismatch, leading to CRC errors. Additionally, 1000BASE-SX supports only up to 550 m over MMF, not 5 km.
- C
Set speed 1000, duplex full; replace SFP with 1000BASE-LX; use single-mode fiber (SMF).
Why wrong: This is incorrect because the switch port is set to 100 Mbps, not 1000 Mbps. Setting speed 1000 would cause a speed mismatch, and the interface would not come up. The SFP and fiber type are correct for 5 km, but the speed must match the switch.
- D
Set no speed, no duplex (auto); replace SFP with 1000BASE-LX; use single-mode fiber (SMF).
Why wrong: This is incorrect because leaving speed and duplex on auto will not match the switch's manual settings, causing a mismatch. The switch port is manually set to 100/full, so auto-negotiation on R1 will fail, leading to a duplex mismatch and CRC errors.
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