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Table Of Contents  CertiGuide to Network+
 9  Chapter 0101:  TCP/IP
      9  IV  Loopback Addressing and Connections

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Hardware Loopback Connections
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Crossover Connection Between Two Computers

You can also test networking between two computers connected via UTP, without involving any other devices such as hubs, by means of a specially-constructed crossover cable, as described in our discussion of LAN Cabling, which switches the transmit and receive lines so that an intermediate hub is not required When using a crossover connector between 2 computers, the signal crosses over the TX (transmit)(signal out) line to the RX (receive) (signal in) line so that the signal is then redirected back to the computer to test or connect 2 computers.

This of course works well if properly made and should be considered part of every network administrator’s tool kit.

[spacer]Local Host

Know that the address 127.n.n.n is reserved for local host and that you will see a response measured in time, given by the PING command if TCP/IP is correctly installed on a machine.


Table 7: Class Addressing Chart

Class

Address Range

Host Range
N=Network
H=Host

Private Network Address Range

A

1-126

n.0.0.1- n.255.255.254
N.H.H.H

10.0.0.0 - 10.255.255.255

N/A

127

N/A

N/A

B

128.0 - 191.254.0.0

n.n.0.1 - n.n.255.254
N.N.H.H

172.16.0.0 - 172.31.255.255

C

192.0. - 223.255.255.0

n.n.n.1 - n.n.n.254
N.N.N.H

192.168.0.0 - 192.168.255.255

D

224-239
Reserved Multicasting

N/A

N/A


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