Lecture Introduction to Networks - Chapter 6: Network Layer

After studying this chapter students will be able to: Explain how network layer protocols and services support communications across data networks, explain how routers enable end-to-end connectivity in a small to medium-sized business network, determine the appropriate device to route traffic in a small to medium-sized business network, Configure a router with basic configurations.
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Lecture Introduction to Networks - Chapter 6: Network Layer Chapter 6: Network Layer Introduction to NetworksPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 1 Chapter 6: Objectives Students will be able to:  Explain how network layer protocols and services support communications across data networks.  Explain how routers enable end-to-end connectivity in a small to medium-sized business network.  Determine the appropriate device to route traffic in a small to medium-sized business network.  Configure a router with basic configurations.Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2Chapter 6 6.1 Network Layer Protocols 6.2 Routing 6.3 Routers 6.4 Configuring a Cisco Router 6.5 SummaryPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 3Network LayerNetwork LayerPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 4Network Layer ProtocolsNetwork Layer in CommunicationPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 5Network Layer in CommunicationThe Network LayerEnd to End Transport processes Addressing end devices Encapsulation Routing De-encapsulatingPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 6Network Layer in CommunicationNetwork Layer ProtocolsCommon Network Layer Protocols Internet Protocol version 4 (IPv4) Internet Protocol version 6 (IPv6)Legacy Network Layer Protocols Novell Internetwork Packet Exchange (IPX) AppleTalk Connectionless Network Service (CLNS/DECNet)Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 7Characteristics of the IP protocolCharacteristics of IPPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 8Characteristics of the IP protocolIP - ConnectionlessPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 9Characteristics of the IP protocolIP – Best Effort DeliveryPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 10Characteristics of the IP protocolIP – Media IndependentPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 11IPv4 PacketEncapsulating IPPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 12IPv4 PacketIPv4 Packet HeaderVersion, Differentiated Services (DS), Time-to-Live(TTL),Protocol, Source IP Address, Destination IP Address Byte 1 Byte 2 Byte 3 Byte 4 IP Header Differentiated Services Version Total Length Length DSCP ECN Identification Flag Fragment Offset Time To Live Protocol Header Checksum Source IP Address Destination IP Address Options (optional) PaddingPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 13IPv4 PacketIPv4 Header FieldsInternet Header Length (IHL), Total Length, Header Checksum,Identification, Flags, Fragment Offset Byte 1 Byte 2 Byte 3 Byte 4 IP Header Differentiated Services Version Total Length Length DSCP ECN Identification Flag Fragment Offset ...