Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) Instrukcja Użytkownika Pobierz pdf (Strona 17)

16 CHAPTER 1  CLICK 340/341/342 MANAGED SWITCHES

IP addresses can be represented in decimal or hexadecimal form. In decimal notation, bytes

are separated by dots (dotted decimal notation) to show the logical grouping of the indi-

vidual bytes.

Example

The decimal points do not divide the address into a network and user address. Only

the value of the ﬁrst bits (before the ﬁrst zero) speciﬁes the network class and the

number of remaining bits in the address

e gure below shows the possible address combinations (see Figure 2.2).

Figure 2.2 – Structure of IP addresses

Certain IP addresses are reserved for special functions. e following addresses should not

be used as standard IP addresses:

 127.x.x.x Addresses – e Class A network address “127” is reserved for a loopback

function on all computers, regardless of the network class. is loopback function may

only be used on networked computers for internal test purposes.

If a telegram is addressed to a computer with the value 127 in the rst byte, the receiver

immediately sends the telegram back to the transmitter.

e correct installation and conguration of the TCP/IP soware, for example, can be

checked in this way.

As Layers 1 and 2 of the ISO/OSI reference model are not included in the test they

should be tested separately using the ping function.

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Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) Instrukcja Użytkownika Strona 17