"O Level Internet Tech" Last 10 years Paper Solution- Part 2(Paid)

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IP Address
• As with any other network-layer protocol, the IP addressing scheme is integral to
the process of routing IP datagrams through an internetwork.
• Each IP address has specific components and follows a basic format. These IP
addresses can be subdivided and used to create addresses for subnetworks.
• Each host on a TCP/IP network is assigned a unique 32-bit logical address that
is divided into two main parts
 Network number
 Host number
• Network Number
 The network number identifies a network and must be assigned by the
Internet Network Information Center (InterNIC) if the network is to be part of
the Internet.
 An Internet Service Provider (ISP) can obtain blocks of network addresses
from the InterNIC and can itself assign address space as necessary.
• Host number
 The host number identifies a host on a network and is assigned by the local
network administrator.
• IP Address Format
 The 32-bit IP address is grouped eight bits at a time, separated by dots, and
represented in decimal format (known as dotted decimal notation).
 Each bit in the octet has a binary weight (128, 64, 32, 16, 8, 4, 2, 1).
 The minimum value for an octet is 0, and the maximum value for an octet is
255.
 The following FIG 2.9 shows the basic format of an IP address. An IP address
consists of 32 bits, grouped into four octets.

• IP Address Classes
 IP addressing supports five different address classes: A, B,C, D, and E.
 Only classes A, B, and C are available for commercial use.
 The left-most (high-order) bits indicate the network class. The following table
provides reference information about the five IP address classes.

IP address formats for commercial use
 The class of address can be determined easily by examining the first octet of
the address and mapping that value to a class range in the following table.
 In an IP address of 172.31.1.2, for example, the first octet is 172. Because 172 falls between 128 and 191, 172.31.1.2 is a Class B address


Most Important Questions with Solution
1. Different between
i. Slip Vs PPP
ii. Peer to Peer Vs Client Server
iii. Lan Vs Man
iv. Ipv6 and ipv4
2. Define
i. MIME
ii. ISDN
iii. Role of DNS
iv. Network topology
v. URL
vi. Meta Search Engine
vii. E-mail encryption
viii. Firewall
3. Short Notes
i. SMTP/POP3/IMAP
ii. FDDI
iii. Java Script program to display “ hello computer”
iv. E- commence
v. CGI
vi. Public Key Cryptography
vii. telnet
viii. ftp
4. Must Learn
i. Packet Switching Technology
ii. Osi MODEL
iii. TCP/IP MODEL
iv. Network Topologies
v. IP CLASSES