Figure 52 network layer and data link layer encapsulation. View essay 5 network layer and ipv4 from computer 21 at university of baghdad. Routers layer3 devices are specified at the network layer and provide the routing services within an internetwork. The second level of the open system interconnection osi model is the data link layer. What is the destination address for the packets network layer.
This is effectively the manner in which they maintain an open channel between the two devices. During the encapsulation process, layer 3 receives the layer 4 pdu and adds a layer 3 header, or label, to create the layer 3 pdu. Network layer protocol an overview sciencedirect topics. The layer 3 switch functions at the network layer and performs the multiport, virtual lan, data pipelining functions of a standard layer 2 switch.
Osi network layer osi layer 3 university of babylon. Notice that the bottom layer is identified as the first layer. Osi network layer ite i chapter 6 2006 cisco systems, inc. It is designed to provide an additional opportunity to practice the skills and knowledge presented in the. The light forms an electromagnetic carrier wave that is. To ease the transition from ip to osirm protocols, integrated is is or dual.
Network layer of the ccna 1 course with lots of ummms. Which characteristic of the network layer in the osi model allows. Chapter 5 osi network layer router computing internet. Presentation application session transport network data link physical layer 7 layer 6 layer 5 layer 4 layer 3 layer 2 layer. It can also perform basic routing functions between virtual lans. The data link layer is adjacent to the physical layer, so they are associated pretty closely together. The function of each layer should be chosen according to the internationally standardized protocols. Provides the means to both send and receive data when. Tcp is reliable chapter 4 ip is unreliable ip makes a best effort to deliver packets tcp can be relied on delivery problems. Match the characteristic to the forwarding method not all options are used. Identify the role of the network layer, as it describes communication from one end device to another end device examine the most common network layer protocol, internet. The network access layer of the tcpip model performs the same functions as the physical and data link layers of the osi model. Chapter 1 introduction to networking and the osi model. The mac sublayer is also responsible for adding a header and a trailer to the network layer protocol data unit pdu.
Network fundamentals, ccna exploration companion guide. To accomplish this endtoend transport, layer 3 uses four basic processes. Cisco public 1 osi network layer network fundamentals. Chapter 4 osi transport layer free download as powerpoint presentation. Fiberoptic cables are the second type of media used.
When referring to the network layer, we call this pdu a packet. The number of layers should be large enough that distinct functions should not be put in the same layer and. Foundation topics the tcpip and osi networking models cisco. However, at lower levels of the osi model, there is no permanent connection but. Ccna exploration network chapter 5 free download as powerpoint presentation. Chapter 1 living in a networkcentric world 1 chapter 2 communicating over the network 33 chapter 3 application layer functionality and protocols 63 chapter 4 osi transport layer 99 chapter 5 osi network layer 5 chapter 6 addressing the network. In todays quiz within the overarching curriculum of the cisco certified network associate, well be taking a look at a very important topic youll need to know about if you want to make it in the networking industry. The session layer of the open system interconnection osi model defines how the data is formatted between the devices on either side of the link. Osi network layer network fundamentals chapter 5 modified by.
Network processes to applications data representation interhost communication 7 6 5 4 3 2 1 application presentation session transport network data link physical. Eigrp and ospf are not considered application layer protocols, rather they are network layer protocols since they are respectively using ip protocol 88 and ip protocol 89 to communicate, you can refer the ipv4 header diagram and check the details of protocol field where there is dedicated port under the protocol field for each layer 3 protocol. Choose from 500 different sets of cisco ccna 1 chapter 10 flashcards on quizlet. The network layer sends packets between peer network layers. Application layer protocols help exchange data between programs running on the source and destination hosts. Fiberoptic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. Later chapters examine the transport layer in more detail, and discuss more. Most tcpip application layer protocols were developed before pcs, guis and multimedia objects. Multiplexing the data from upper layer applications, hiding any network dependent information from the upper layers which will only confuse them and breaking down session layer layer 5 datagrams into segments are some of a range of support activities this layer performs. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Objectives identify the role of the network layer, as it describes communication from one end device to another end device examine the most common network layer protocol, internet protocol ip, and its features for providing connectionless and. In this chapter, you will learn about the core concepts behind osi layer 3. In network layer protocols, specifically in the ip, addresses identify network adapters. Network layer processes addressing network layer must provide a mechanism for addressing the end devices.
The port density of the switch is determined by the cisco ios. The network layer, or osi layer 3, provides services to exchange the individual pieces of data over the network between identified end devices. Chapter 5 osi network layer free download as powerpoint. Next step is to have each node locally run the dijkstra algorithm on the. A layer should be created where different level of abstraction is needed.
Define the basic role of the network layer in data networks. Configure two active interfaces on a cisco ios router. It is designed to provide an additional opportunity to practice the skills and knowledge presented in the chapter and to prepare for the chapter 4 exam. Objectives describe the purpose of the transport layer in managing the transportation of data in end toend communication. Cisco chapter 5 test answers quizlet start studying cisco 2 chapter 2 exam. A network team is comparing topologies for connecting. Ipv4 171 chapter 7 osi data link layer 243 chapter 8 osi physical layer 279 chapter 9 ethernet 3.
Host in an ipv4 network is an end device with network layer address. When you finish this chapter, you will be able to explain the basic osi terminology and network layer protocols used in osi, the way in which networks and interfaces are represented in isis, the basic principles of area routing, and the use of isis in. The link layer corresponds to the osi data link layer and may include similar functions as the physical layer, as well as some protocols of the osis network layer. The application layer of the tcpip model represents the session, presentation, and application. The arp protocol resolves ipv4 addresses to mac addresses and maintains a table of mappings. Each node on an ip network has both a mac address and an ip address. The course, the first of four in the new curriculum, is based on a topdown approach to networking. Download pdf chapter 2 test online examanswers download pdf chapter 3 test. Chapter 5 ethernet lecture from the intro to networks course at around 4.
Learn cisco ccna 1 chapter 10 with free interactive flashcards. Connectionless packet delivery may, however, result in packets arriving at the destination out of sequence. It also explains the terminology behind the osi networking model in. If outoforder or missing packets create problems for the application using the data, then upper layer services will have to resolve these issues. The application layer acts as interface between the applications and the underlying network. This is effectively the manner in which they maintain an open channel between. The seven layers of the osi model application layers upper layers. Second, the network layer must provide encapsulation. The internetwork layer equates to the network layer of the osi model. Cisco public 1 osi network layer network fundamentals chapter 5. The tcpip application layer performs the functions of the upper three layers of the osi model. Figure 2 5 outlines the basic idea behind how tcp notices lost data and. Whereas the physical layer deals with the actual physical media the cables and so forth that the data move over, the data link. These comparisons are based on the original sevenlayer protocol model as defined in iso 7498, rather than refinements in the internal organization of the network layer.
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