CCNA_ITN_Chp6 (1).pptx – Chapter 6 Network Layer CCNA Routing and Switching Introduction to Networks v6.0 Chapter 6 Sections Objectives 6.1 Network

CCNA_ITN_Chp6 (1).pptx – Chapter 6 Network Layer CCNA Routing and Switching Introduction to Networks v6.0 Chapter 6 Sections Objectives 6.1 Network

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Chapter 6: Network Layer CCNA Routing and Switching Introduction to Networks v6.0

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2 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential  6.1 Network Layer Protocols • Explain how network layer protocols and services support communications across data networks • Describe the purpose of the network layer in data communication. • Explain why the IPv4 protocol requires other layers to provide reliability. • Explain the role of the major header fields in the IPv4 packet. • Explain the role of the major header fields in the IPv6 packet.  6.2 Routing • Explain how routers enable end-to-end connectivity in a small to medium-sized business network. • Explain how network devices use routing tables to direct packets to a destination network. • Compare a host routing table to a routing table in a router. Chapter 6 – Sections & Objectives

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3 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential  6.3 Routers • Explain how devices route traffic in a small to medium-sized business network • Describe the common components and interface of a router. • Describe the boot-up process of a Cisco IOS router.  6.4 Configuring a Cisco Router • Configure a router with basic configurations. • Configure initial settings on a Cisco IOS router. • Configure two active interfaces on a Cisco IOS router. • Configure devices to use the default gateway Chapter 6 – Sections & Objectives (Cont.)

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4 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 6.1 Network Layer Protocols

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5 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Network Layer in Communications The Network Layer  To Communicate with anyone who is not on your local network, you must have access to routers.  If you want to send an email to a someone who lives in another city, or even another country. This person is not on the same network as you. A simple switched network cannot get your message any further than the end of your own network.  A router is an intermediary networking device that operates at layer 3 – the Network layer of the OSI model. A router forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet as well as other roles.

Image of page 5 6 © 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Network Layer in Communications The Network Layer • The network layer, which resides at OSI Layer 3, provides services that allow end devices to exchange data across a network. • The network layer uses four processes in order to provide end-to-end transport: • Addressing of end devices – IP addresses must be unique for identification purposes. • Encapsulation – The protocol data units from the transport layer are encapsulated by adding IP header information including source and destination IP addresses. Image of page 6 Image of page 7 // Placeholder $(‘input, textarea’).placeholder();

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