Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) Uživatelský manuál stáhnout pdf (Strana 16)

CHAPTER 1  CLICK 340/341/342 MANAGED SWITCHES 15

switch.

Assigning IP Addresses

e IP address is a 32-bit address, which consists of a network part and a user part. e

network part consists of the network class and the network address (see Figure 2.1).

Figure 2.1 – Position of Bits Within the IP Address

ere are currently ve dened network classes; Classes A, B and C are used in modern

applications, while Classes D and E are used rarely. It is therefore usually sucient if a net-

work device only recognizes Classes A, B and C.

With binary representation of the IP address the network class is represented by the rst

bits. e key factor is the number of “ones” before the rst “zero.” e assignment of classes

is shown in the following table (see Table 2.1). e empty cells in the table are not relevant

to the network class and are already used for the network address.

Bit 1 Bit 2 Bit 3 Bit 4 Bit 5

Class A

Class B

1 0

Class C

1 1 0

Class D

1 1 1 0

Class E

1 1 1 1 0

Table 2.1 – Assignment of Classes

e bits for the network class are followed by those for the network address and the user ad-

dress (see Table 2.2). Depending on the network class, a dierent number of bits are avail-

able, both for the network address (network ID) and the user address (host ID).

Network ID Host ID

Class A

7 bits 24 bits

Class B

14 bits 16 bits

Class C

21 bits 8 bits

Class D

28-bit multicast identiﬁer

Class E

27 bits (reserved)

Table 2.2 – Bits for the Network and User Addresses

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 75 76

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Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) Uživatelský manuál Strana 16