#sho int se 0/0
Serial0/0 is up, line protocol is up
  <Interface is recieving a carrier signal and Layer 2 Keepalives.>

Hardware is PQUICC with Fractional T1 CSU/DSU
  <The hardware is a T1 WIC with a Built in CSU/DSU>

Description: This is the description
  <description is is in Interface config mode with the description command>

Internet address is 192.168.15.246/30
  <The IP address.  Seeing this implies that IP routing is enabled>

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
  <MTU/BW -Info about largest data unit the media can handle.>

reliability 255/255, txload 18/255, rxload 58/255
  <reliability - 5 minute weighted average reliablity as a percentage of 
0/255, Txload - 5 minute weighted average Transmit load, RxLoad - 5 minute 
weighted average Recieve Load. These values are based on the interface 
config mode command Bandwidth that defaults to T1 (1.54mbps)>

Encapsulation HDLC, loopback not set
  <Using Cisco's Flavor of HDLC, and the interface is not in Loopback mode>

Keepalive set (10 sec)
  <transmitting/expecting layer 2 keepalives every 10 seconds>

Last input 00:00:00, output 00:00:00, output hang never
  <packets last input 00:00 mm:ss ago, packets last output 00:00 mm:ss ago>

Last clearing of "show interface" counters never
  <priveledged mode "clear counters" has never been done.>

Queueing strategy: fifo
  <First-in, First out... do a cissco search for queueing, if you have 
bandwidth problems, it could be weighted fair or priority..>

Output queue 0/40, 58 drops; input queue 0/75, 0 drops
  <Output queue is empty/40 packets in size, but has dropped 58 packets 
because the buffer was full since the last time the counters were cleared.  
Input queue is empty/75 packets in size, and has dropped no packets since 
the last time the counters were cleared.>

1 minute input rate 355000 bits/sec, 99 packets/sec
  <In the last 60 seconds, the average input traffic was 99 packets/sec, and 
355000 bits/sec>

1 minute output rate 112000 bits/sec, 100 packets/sec
  <In the last 60 seconds, the average output traffic was 100 packets/sec, 
and 112000 bits/sec>

308965907 packets input, 1014294053 bytes, 0 no buffer
  <Total packets/bytes in since the last clear counters>

Received 883558 broadcasts, 0 runts, 0 giants, 0 throttles
11847 input errors, 6343 CRC, 5249 frame, 0 overrun, 0 ignored, 255
abort
  <information about the types of packets recieved and any errors>

314404702 packets output, 3738494911 bytes, 0 underruns
0 output errors, 0 collisions, 5 interface resets
0 output buffer failures, 0 output buffers swapped out
  <information about the types of packets sent and errors>

1 carrier transitions
  <The carrier signal (Like a Physical Layer Keepalive) has gone from down 
to up, or up to down 1 time>

DCD=up DSR=up DTR=up RTS=up CTS=up
  <DCD is the carrier signal, the others are standard serial interface 
signals.  You can look them up in the Rs-232 or rs-242 or... 
specificatiosn.>



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