W4_Ether Basics1.pptx - Ethernet and Routing Basics I March 2017 <Change information classification in footer> All Rights Reserved \u00a9 Alcatel-Lucent

W4_Ether Basics1.pptx - Ethernet and Routing Basics I March...

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All Rights Reserved © Alcatel-Lucent 2014 <Change information classification in footer> Ethernet and Routing Basics I March 2017
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All Rights Reserved © Nokia 2017 Topics 1. Warm up 2. Layer 2 Ethernet Overview 3. ARP and ICMP
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All Rights Reserved © Nokia 2017 1 Warm Up
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All Rights Reserved © Alcatel-Lucent 2014 What Do We Know About Routing? If you don’t know how to go to an address... Somebody tells you!
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All Rights Reserved © Alcatel-Lucent 2014 What Do We Know About Routing? Same as process of telling somebody an address Internet I want to go to Google, how can i go there? hat is IP address of ? =74.125.128.104 74.125.128.104 Web Server
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All Rights Reserved © Alcatel-Lucent 2014 What Do We Know About Routing? Computer asks the the way to 74.125.128.104 to closest router So how can i go to 74.125.128.104? Internet 74.125.128.10
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All Rights Reserved © Alcatel-Lucent 2014 What Do We Know About Routing? Routing is: o Forwarding IP packets to the destination that they want to reach based on the destination IP addresses in their header !!!!
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All Rights Reserved © Alcatel-Lucent 2014 Layer 3 Connects Multiple Layer 2 Networks 8 | Alcatel-Lucent
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All Rights Reserved © Alcatel-Lucent 2014 Layer 3 Routing vs. Layer 2 Switching 9 | Alcatel-Lucent Internet 74.125.128.104 IP Routing is about forwarding datagrams end-to- end , most often through multiple hops (routers) Layer 2 Switching is about forwarding datagrams to the immediate next-hop , which can be connected on a point-to-point link, or a broadcast environment. 00:e0:b1:88:0d:c0 00:e0:b1:a4:38:fd 00:e0:b1:5a:e5:3c 00:b8:73:fb:c1:58 Broadcast Point-to-Point
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All Rights Reserved © Nokia 2017 2 Layer 2 Ethernet Overview
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All Rights Reserved © Alcatel-Lucent 2014 Layer 2 Overview 11 | Alcatel-Lucent Why do we need Layer 2? Required for higher-layer data transfer Characteristics of Layer 2 Scope Local network Encapsulating the packet into a frame for Layer 2 forwarding Layer 2 Framing Addressing/Identification, MTU Examples of Layer 2 Protocols Ethernet, ATM , Frame Relay , TDM
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All Rights Reserved © Alcatel-Lucent 2014 Scope of Data Link Layer 12 | Alcatel-Lucent L2 frames are transmitted only to devices and hosts within the same network L2 networks are separated by routers The PCs on the left side of Ethernet network do not require anything than L2 Ethernet framing to communicate each other
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