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Chapter 5 Study Guide

Chapter 5 Study Guide - SEMESTER 1 Chapter 5 OSI Network...

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SEMESTER 1 Chapter 5 OSI Network Layer V 4.0 5.1.1. 1 What services does the network layer provide? The Network layer, or OSI Layer 3, provides services to exchange the individual pieces of data over the network between identified end devices. What are the 4 basic processes used at the network layer? Addressing Encapsulation Routing Decapsulation What is the PDU of the network layer? Layer 3 What information is contained in the layer 3 PDU? When referring to the Network layer, we call this PDU a packet. When a packet is created, the header must contain, among other information, the address of the host to which it is being sent. What is the role of a router? Intermediary devices that connect the networks are called routers. The role of the router is to select paths for and direct packets toward their destination. This process is known as routing. What is it called when a packet passed through an intermediary device? Hop What happens to the transport layer PDU as the packet moves through the network? As the packet is forwarded, its contents (the Transport layer PDU), remain intact until the destination host is reached. What does the network layer protocol specify? Network layer protocols specify the packet structure and processing used to carry the data from one host to another host. 5.1.1. 2 List the 5 Network layer protocols. IPv4, IPv6, IPX, Apple Talk, Connectionless Network Service (CLNS/DECnet) Which protocol will be the focus of this class? IPv4 and IPv6 5.1.2. 1 What are the basic characteristics of IPv4? Connectionless, best effort(unreliable), Media independant 5.1.3 Describe what a connectionless service in networking means? IP packets are sent without notifying the end host that they are coming. What is the main issue that may occur in a connectionless exchange? Connectionless packet delivery may, however, result in packets arriving at the destination out of sequence. 5.1.4 What does unreliable mean in networking? Unreliable means simply that IP does not have the capability to manage, and recover from, undelivered or corrupt packets.
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Which layer is responsible for adding reliability to packet delivery? Network layer 3 5.1.5 Describe media independent. The Network layer is also not burdened with the characteristics of the media on which packets will be transported. Any individual IP packet can be communicated electrically over cable, as optical signals over fiber, or wirelessly as radio signals. What layer is responsible for preparing a packet for the media? Network Layer 3 What is the one characteristic of the network layer that is dependent on the media? Maximum Transmission Unit (MTU). 5.1.6 What portion of the IP packet does a router use to make forwarding decisions? IP Header
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Chapter 5 Study Guide - SEMESTER 1 Chapter 5 OSI Network...

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