1. Network Concepts

2. Outlines What is Network ? Types of Networks Network Topologies
Some of Network Devices and cables
What is protocol
CCNA

3. What is Network ?
Computer network : A collection of computing devices that are connected in various ways in order to communicate and share resources .
Usually, the connections between computers in a network are made using physical wires or cables
However, some connections are wireless, using radio waves or infrared signals .
The generic term node or host refers to any device on a network

4. What is Network ? cont….
Gateway
Servers
Firewall
Switches
Clients

5. Types of Networks
Local Area Network
(LAN)
Wide Area Network
(WAN)

6. Types of Networks cont…
Local Area Network (LAN) :
A network that connects a relatively small number of machines in a relatively close geographical area
Wide Area Network (WAN) :
A network that connects two or more local-area networks over a potentially large geographic distance

7. LAN Network Topologies
Bus Topology
Star
Topology
Ring Topology

8. LAN Network Topologies cont…
Bus Topology:
All nodes are connected to a single communication line that carries messages in both directions
CSMA/CD : Carrier Sense Multi Access / Collation Detection
Disadvantages :
Adding more computers will reduce the access speed on the network.
Collations
Terminator

9. LAN Network Topologies cont…
Ring Topology:
A configuration that connects all nodes in a closed loop on which messages travel in one direction
Token : In this topology, to transmit on the wire your computer must have control of the token or wait for the token to be free
Disadvantages :
that a single malfunctioning workstation can disable the whole network

10. LAN Network Topologies cont…
Star Topology:
A configuration that centers around one node to which all others are connected and through which all messages are sent
Disadvantages :
Expensive
if a central device was to fail then all computers connected to that device would not be able to see the network

11. Network Devices

12. Network Devices What is a Hub?
A hub is usually a small rectangular box, often made of plastic, which receives its power from an ordinary wall outlet
A hub joins multiple computers (or other network devices) together to form a single network segment
On this network segment, all computers can communicate directly with each other
Larger hubs contain 8, 12, 16, and even 24 ports
Many times the last port is reserved for "uplink" which is the connecting of one hub to another hub or similar device (joining two segments together).

13. Network Devices cont…. What is a Hub? a packet: types of hubs :
Essentially, a hub simply receives incoming packets, possibly amplifies the electrical signal, and broadcasts these packets out to all devices on the network - including the one that originally sent the packet!
a packet:
is a formatted block of data carried by a computer network
types of hubs :
Passive : do not amplify the electrical signal of incoming packets
Active : amplify the electrical signal of incoming packets back to their original level
Intelligent: is typically stackable (built in such a way that multiple units can be placed one on top of the other to conserve space).

14. Network Devices cont…. What is a Network Switch?
A network switch is a small hardware device that joins multiple computers together within one local area network (LAN)
Unlike hubs, network switches are capable of inspecting data packets as they are received, determining the source and destination device of that packet, and forwarding it appropriately
By delivering each message only to the connected device it was intended for, a network switch conserves network bandwidth and offers generally better performance than a hub

15. Network Devices cont…. What is a Router? A Gateway:
Routers are physical devices that join multiple wired or wireless LAN networks together
Technically, a wired or wireless router is a Layer 3 gateway device
A Gateway:
is a device that acts like a security guard and only allows data in or out if it has the right network headers

16. Network Cables

17. What is protocol Protocols:
are the rules governing the transfer of data information, it can also be compared to how humans use languages (to get your point across you must talk in the same language as the person you are speaking to).
Home “networkers” often use an Internet Protocol (IP) wired or wireless for communication

18. Cisco Certified
Network Associate

19. CCNA Certification Adaptive Testing 1 Paper : 150 US $
Course Information
CCNA Certification
Adaptive Testing
1 Paper : 150 US $
Time Limit : 90 minutes
No. Questions : 55 – 65
Passing Score : 849/1000
Questions Format :
Single Choice
Multiple Choice
Drag & Drop
Fill in the Blanks
Router Simulations
Scenario Based

20. CCNA Routing and Switching Study Guide by Todd Lammle
Reference Books
Reference Books
CCNA Routing and Switching Study Guide by Todd Lammle

21. CCNA Course Overview Day 1 : OSI Layers
Day 2 : IP Addressing & Subnetting
Day 3 : Subnetting, VLSM & CIDR
Day 4 : Initial Configuration &
Internal & External of Routers
Day 5 : Wan Interface Configuration &
Static & Default Routing
Day 6 : Dynamic Routing : RIP & IGRP
Day 7 : Dynamic Routing : OSPF & EIGRP
Day 8 : Access List - Standard, Extended & Named
Day 9 : Switching
Day 10 : VLAN – Virtual Lan
Day 11 : Integrated Service Digital Network
Day 12 : Frame- Relay
Day 13 : Troubleshooting of Leased Line

22. Thank You

23. Questions ???