Page 165 - Computer_Science_F5

Computer Science 1. (a) How would you determine the 3. (a) How would you determine
(e) 01000111 00110110
Exercise 3.6

10110011 00011111
class for a given IP address in
Network ID and Host ID parts
dotted decimal notation?
FOR ONLINE READING ONLY
for a given IP address?
(b) Identify class for the following
IP addresses in dotted decimal (b) Identify Network ID and Host
ID parts for the following IP
notation: addresses:
(i) 100.31.21.11 (i) 125.100.90.10
(ii) 165.10.11.1 (ii) 201.198.168.72
(iii) 242.12.13.14 (iii) 165.19.20.6

(iv) 200.200.200.200 4. Calculate the number of Network
(v) 230.13.56.100 IDs and Host IDs for each IP address
class. Then, pick one network ID
2. How would you determine the class from each class and list all possible
for a given IP address in binary IP addresses that can be assigned
notation? Identify class for the within that network.
following IP addresses in binary
notation: Network masks
(a) 11110001 11111000 A network mask, also known as an
10110011 00011001
default mask, is a 32-bit value used to
(b) 11100111 00001111 differentiate the network ID from the
01110000 11110001 host ID in any given IP address. The
network mask is defined as follows:
(c) 11000111 00111110
00110011 00000000 (a) All bits that correspond to the network
ID are set to 1.
(d) 10110011 10111110 (b) All bits that correspond to the host
00110011 11111111 ID are set to 0.

Network masks are typically shown in binary or dotted decimal notation, as seen
in Table 3.5.

Table 3.5: Binary and dotted decimal representation of default network masks

Address class Bits for network mask Network mask

Class A 11111111 00000000 00000000 00000000 255.0.0.0
Class B 11111111 11111111 00000000 00000000 255.255.0.0
Class C 11111111 11111111 11111111 00000000 255.255.255.0

156
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Computer Science Form 5.indd 156 23/07/2024 12:33