Page 163 - Computer_Science_F5

Computer Science inter-process communication, as shown and up to 254 valid hosts per network.
in Table 3.2.
Class C addresses range from 192.0.0.0
to 223.255.255.255 in decimal notation,
Class B
encompassing the range from 192 to 223
Class B addresses are assigned to for the first octet, as shown in Table 3.2.
FOR ONLINE READING ONLY
networks ranging from medium-sized to
large-sized. In a Class B address, the two Class D
highest-order bits are always set to binary Class D addresses are specifically reserved
10. The following 14 bits (completing for IP multicast addresses. In a Class D
the first two octets) form the network address, the four highest-order bits are
ID, while the remaining 16 bits (last always set to binary 1110. The remaining
two octets) represent the host ID. This bits are used for the multicast group address
allocation allows for 16,384 networks that interested hosts recognise. Class D
and up to 65,534 valid hosts per network. addresses are supported by applications
Class B addresses span from 128.0.0.0 to multicast data to hosts capable of
to 191.255.255.255 in decimal notation,
encompassing the range from 128 to 191 receiving multicast on an internetwork.
for the first octet, as shown in Table 3.2. Class D addresses range from 224.0.0.0
to 239.255.255.255 in decimal notation,
Class C covering the first octet values from 224
Class C addresses are assigned to small- to 239, as shown in Table 3.2.
sized networks. In a Class C address,
the three highest-order bits are always Class E
set to binary 110. The following 21 bits Class E is an address class designated
(completing the first three octets) form for experimental purposes and reserved
the network ID, while the remaining 8 for future use. In a Class E address, the
bits (last octet) represent the host ID. This four highest-order bits are set to binary
allocation allows for 2,097,152 networks 1111, as shown in Table 3.2.

Table 3.2: Five IP address classes

Class First First IP range Subnet mask Hosts per Number of
octet octet Network networks
decimal binary ID
(Range) (Range)

24
A 0 - 127 0xxxxxxx 0.0.0.0 - 127.255.255.255 255.0.0.0 2 - 2 2 (128)
7
14
16
B 128 - 191 10xxxxxx 128.0.0.0 - 191.255.255.255 255.255.0.0 2 - 2 2 (16,384)
C 192 - 223 110xxxxx 192.0.0.0 - 223.255.255.255 255.255.255.0 2 - 2 2 (2,097,152)
8
21
D 224 - 239 1110xxxx 224.0.0.0 - 239.255.255.255 Not applicable Not Not applicable
applicable
E 240 - 255 1111xxxx 240.0.0.0 - 255.255.255.255 Not applicable Not Not applicable
applicable
154
for Advanced Secondary Schools

Computer Science Form 5.indd 154 23/07/2024 12:33