Cisco 2501 - Router - EN Manual de usuario descargar pdf (Pagina 52)

230

Chapter 4

Introduction to the Cisco IOS and SDM

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Auto-duplex, Auto Speed, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output 00:02:07, 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

0 packets input, 0 bytes

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog

0 input packets with dribble condition detected

16 packets output, 960 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

Router#

As you probably guessed, we’re going to discuss the important statistics from this output, but

first, for fun (this is all fun, right?), I’ve got to ask you, What subnet is the FastEthernet 0/0 a

member of and what’s the broadcast address and valid host range?

And, my friend, you really have to be able to nail these things NASCAR fast! Just in case

you didn’t, the address is 192.168.1.33/27. And I’ve gotta be honest—if you don’t know what

a /27 is at this point, you’ll need a miracle to pass the exam. (A /27 is 255.255.255.224.) The

fourth octet is a block size of 32. The subnets are 0, 32, 64, …; the FastEthernet interface is

in the 32 subnet; the broadcast address is 63; and the valid hosts are 33–62.

If you struggled with any of this, please save yourself from certain doom

and get yourself back into Chapter 3 now! Read and reread it until you’ve

got it dialed in!

The preceding interface is working and looks to be in good shape. The show interfaces

command will show you if you are receiving errors on the interface, and it will show you the

maximum transmission units (MTUs), bandwidth (BW), reliability (255/255 means perfect!),

and load (1/255 means no load).

Continuing to use the previous output, what is the bandwidth of the interface? Well, other

than the easy giveaway of the interface being called a FastEthernet interface, we can see that

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