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Welcome to Early Bird Class

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Presentation on theme: "Welcome to Early Bird Class"— Presentation transcript:

1 Welcome to Early Bird Class
Networking And IT Security Ravi Chandra Gurung

2 Computer Operating System
Our Game Plan Computer Networking Day 1: Introduction to Networking Day 2: IP address system DHCP Gateway NAT Router Setup Computer Operating System Day 3: Introduction to Operating System Day 4: Basic Linux Command OS Installation File Sharing Day 5: Web Server Configuration DNS Server Configuration FTP Server Configuration Computer Security Day 6: Introduction to Security Types of attack Process of attack Introduction to hacking tools and techniques Counter Measures against attack

3 Review of Day 1 Applications of Networks LAN, MAN & WAN
Network Components (Physical Media, Interconnecting Devices, Computers, Networking Software and Applications)

4

5 1 2 3 4 5 6

6 Introduction to Computer Networks
IP address An IP address is a unique global address for a network interface An IP address: - is a 32 bit long identifier - encodes a network number (network prefix) and a host number

7 Introduction to Computer Networks
IP address An IP address is a unique global address for a network interface An IP address: - is a 32 bit long identifier - encodes a network number (network prefix) and a host number

8 Dotted Decimal Notation
Introduction to Computer Networks Dotted Decimal Notation IP addresses are written in a so-called dotted decimal notation Each byte is identified by a decimal number in the range [0..255]: Example: 1st Byte = 128 2nd Byte = 143 3rd Byte = 137 4th Byte = 144

9 Network prefix and Host number
Introduction to Computer Networks Network prefix and Host number The network prefix identifies a network and the host number identifies a specific host (actually, interface on the network). How do we know how long the network prefix is? The network prefix is implicitly defined (see class-based addressing) The network prefix is indicated by a netmask. network prefix host number

10 IPv4 Address Classes Introduction to Computer Networks
Class D Addresses A Class D address begins with binary 1110 in the first octet. First octet range 224 to 239. Class D address can be used to represent a group of hosts called a host group, or multicast group. Class E Addresses First octet of an IP address begins with 1111 First octet range 240 to 255. Class E addresses are reserved for experimental purposes and should not be used for addressing hosts or multicast groups. 

11 IP Addresses as Decimal Numbers
Introduction to Computer Networks IP Addresses as Decimal Numbers

12 Introduction to Computer Networks
Private Addresses

13 Introduction to Computer Networks
DHCP a network protocol that enables a server to automatically assign an IP address to a computer from a defined range of numbers (i.e., a scope) configured for a given network. DHCP allows a computer to join an IP-based network without having a pre-configured IP address. DHCP is a protocol that assigns unique IP addresses to devices, then releases and renews these addresses as devices leave and re-join the network.

14 Introduction to Computer Networks
DHCP Internet service providers usually use DHCP to help customers join their networks with minimum setup effort required. Likewise, home network equipment like broadband routers offers DHCP support for added convenience in joining home computers to local area networks (LANs). DHCP environments require a DHCP server setup with the appropriate configuration parameters for the given network. Key DHCP parameters include the range or "pool" of available IP addresses, the correct subnet masks, plus network gateway and name server addresses.

15 DHCP Introduction to Computer Networks

16 Introduction to Computer Networks
Gateway (router) A network gateway is an internetworking system capable of joining together two networks that use different base protocols. A network gateway can be implemented completely in software, completely in hardware, or as a combination of both.

17 Gateway (router) Introduction to Computer Networks

18 Network Address Translation (NAT)
Introduction to Computer Networks Introduction to Computer Networks Network Address Translation (NAT) Network Address Translation (NAT) is designed for IP address conservation. It enables private IP networks that use unregistered IP addresses to connect to the Internet. NAT operates on a router, usually connecting two networks together, and translates the private addresses in the internal network into legal addresses. As part of this capability, NAT can be configured to advertise only one address for the entire network to the outside world. This provides additional security by effectively hiding the entire internal network behind that address.

19 Network Address Translation (NAT)
Introduction to Computer Networks Introduction to Computer Networks Network Address Translation (NAT)

20 Wireless Communication (Wi-Fi)
Introduction to Computer Networks Introduction to Computer Networks Wireless Communication (Wi-Fi) Wi-Fi allows networking of computers and digital devices without the need for wires. Data is transferred over radio frequencies, allowing Wi-Fi capable devices to receive and transmit data when they are in range of a Wi-Fi network. Wi-Fi, or Wireless Fidelity, is a term that is used generically to refer to any product or service using any type of technology. Wi-Fi networks operate in the unlicensed 2.4 and 5 GHz radio bands

21 Wireless Communication (Wi-Fi)
Introduction to Computer Networks Introduction to Computer Networks Wireless Communication (Wi-Fi)

22 Router Setup IP address DHCP NAT WIFI GATEWAY
Introduction to Computer Networks Introduction to Computer Networks Router Setup IP address DHCP NAT WIFI GATEWAY

23 Thank you Day 3: Introduction to Operating System


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