The Mouse

The history of the computer mouse begins in the 1960s when Dr. Douglas C. Engelbart and his team at Stanford Research Institute (SRI) created the original mechanical pointing device
that is widely credited as being the first mouse. That mouse and Engelbart’s
Criteria Paper computer monitors

Computer monitors with cathode-ray tube (CRT)
The CRT monitors make use of the cathode-ray tube technology, which was the dominant one until the beginning of the 21st century. Nowadays, there are manufacturers and the
Components of the System Unit

The System Unit
The case of the system unit, or chassis, is made of metal or plastic and protects the electrical components inside.  The trend is towards a smaller form factor, or size and shape, of desktop
computers.
KEYBOARD

INTRODUCTION TO THE KEYBOARD
They Keyboard is the primary means of input for a computer.  Most computer functions are triggered
by key commands, many of which cannot be performed with the mouse alone.
Random Accessn Memory

Random Access Memory (RAM)
è  Sends/Receives data quickly between CPU
è  This is way quicker than using just the HDD
è  RAM holds temporary data used by any open application or
active / running process
HDD Hard Dive

Hard drive: most important secondary storage
device
• Hard drive technologies have evolved rapidly
- Hard drive capacities and speeds have increased
- Interfaces with the computer have also changed
Read Only Memory (ROM)

ROM (Read Only Memory)
• Read-only memory (usually known by its
acronym, ROM) is a class of storage media used
in computers and other electronic devices.
How a switch works

What You Will Learn
On completing this chapter, you will be able to:
✔ Differentiate among unicast, multicast, and broadcast transmission
methods
Routers and Routing

Routing Protocols and Concepts - CCNA2
• Routing and packet forwarding
• Static routing
• Dynamic routing protocols
HUB

A hub, also called a network hub, is a common connection point for devices in a network. Hubs are devices commonly used to connect segments of a LAN. The hub contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.
Network Interface Cards (NIC)

Short for Network Interface Card, the NIC is also referred to as an Ethernet card and network adapter. It is an expansion card that enables a computer to connect to a network; such as a home network, or the Internet using an Ethernet cable with an RJ-45 connector.
Computer Firewalls

Firewalls
• A firewall is an integrated collection of security
measures designed to prevent unauthorized
electronic access to a networked computer system.
Network Firewalls

The Need for Firewalls
In the early years, the Internet supported a small community of compatible users who valued
openness for sharing and collaboration. This view was challenged by the Morris Worm .
However, even without the Morris worm, the end of the open, trusting community
would have come soon through growth and diversification.
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