Computer Networks - 01.pptx powerpoint presentation
- 1. Module 1: Networking Today Introduction to Networks v7.0 Selection
- 2. 2 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Networks Affect Our Lives
- 3. 3 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Networking Today No Boundaries • World without boundaries • Global communities • Human network
- 4. 4 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Network Components
- 5. 5 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Network Components End Devices An end device is where a message originates from or where it is received. Data originates with an end device, flows through the network, and arrives at an end device.
- 6. 6 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Network Components Intermediary Network Devices An intermediary device interconnects end devices. Examples include switches, wireless access points, routers, and firewalls. Management of data as it flows through a network is also the role of an intermediary device, including: • Regenerate and retransmit data signals. • Maintain information about what pathways exist in the network. • Notify other devices of errors and communication failures.
- 7. 7 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Network Components Network Media Communication across a network is carried through a medium which allows a message to travel from source to destination. Media Types Description Metal wires within cables Uses electrical impulses Glass or plastic fibers within cables (fiber-optic cable) Uses pulses of light. Wireless transmission Uses modulation of specific frequencies of electromagnetic waves.
- 8. 8 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Common Types of Networks
- 9. 9 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Common Types of Networks LANs and WANs Network infrastructures vary greatly in terms of: • Size of the area covered • Number of users connected • Number and types of services available • Area of responsibility Two most common types of networks: • Local Area Network (LAN) • Wide Area Network (WAN).
- 10. 10 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Common Types of Networks The Internet The internet is a worldwide collection of interconnected LANs and WANs. • LANs are connected to each other using WANs. • WANs may use copper wires, fiber optic cables, and wireless transmissions. The internet is not owned by any individual or group. The following groups were developed to help maintain structure on the internet: • IETF • ICANN • IAB