ccna exploration chapter 5 osi network layer

... a destination network H c vi n m ng Bách khoa - Website: www.bkacad.com Network Layer Protocols and Internet Protocol (IP) • • Define the basic role of the Network Layer in data networks The protocols ... networks The protocols of the OSI model Network layer specify addressing and processes that enable Transport layer data to be packaged and transported The Network layer encapsulation allows its ... need to know network portion (network address) to indicate the best path to reach the network H c vi n m ng Bách khoa - Website: www.bkacad.com 35 Routing Protocols • Routing is an OSI Layer function...

Ngày tải lên: 22/12/2013, 13:17

... www.bkacad.com Physical Layer Protocols & Services • The OSI Physical layer provides the means to transport across the network media the bits that make up a Data Link layer frame H c vi n m ng ... Physical layer signaling and encoding as they are used in networks Identify the basic characteristics of copper, fiber and wireless network media Describe common uses of copper, fiber and wireless network ... receiver circuitry on the network devices At this stage of the communication process, the user data has been segmented by the Transport layer, placed into packets by the Network layer, and further encapsulated...

Ngày tải lên: 22/12/2013, 13:17

... Website: www.bkacad.com Transport Layer Role and Services • Explain the purpose of the Transport layer • Enables multiple applications • • to communicate over the network at the same time on a single ... ng Bách khoa - Website: www.bkacad.com Transport Layer Role and Services • Major functions of the transport layer and the role it plays in data networks – Tracking the individual communication ... Overview • • • • Explain the role of Transport Layer protocols and services in supporting communications across data networks Analyze the application and operation of TCP mechanisms...

Ngày tải lên: 22/12/2013, 13:17

Ngày tải lên: 22/06/2014, 16:20

... upper OSI model layers • • • • • • provide network services to end user applications Describe how the TCP/IP Application Layer protocols provide the services specified by the upper layers of the OSI ... created a network model that helps vendors create networks that are compatible with other networks The Open System Interconnection (OSI) reference model released in 1984 was the descriptive network ... of the top three layers of the OSI model: Application, Presentation and Session layers H c vi n m ng Bách khoa - Website: www.bkacad.com OSI and TCP/IP Model • The Presentation layer has three...

Ngày tải lên: 12/12/2013, 14:15

... describe network functionality Describe the role of each layer in two recognized network models: The TCP/IP model and the OSI model Describe the importance of addressing and naming schemes in network ... multiple individual networks to form an internetwork Examples of intermediary network devices are: – Network Access Devices (Hubs, switches, and wireless access points) – Internetworking Devices ... Internet – A Network of Networks • • • A global mesh of interconnected networks (internetworks) meets these human communication needs The Internet is created by the interconnection of networks belonging...

Ngày tải lên: 12/12/2013, 14:15

... Overview • • • • • • Describe how networks impact our daily lives Describe the role of data networking in the human network Identify the key components of any data network Identify the opportunities ... computer data networks each have their own individual versions of the four basic network elements H c vi n m ng Bách khoa - Website: www.bkacad.com Converged Networks Converged networks • Technology ... these disparate networks onto one platform - a platform defined as a converged network H c vi n m ng Bách khoa - Website: www.bkacad.com Converged Networks • • Intelligent Information Networks: The...

Ngày tải lên: 12/12/2013, 14:15

Ngày tải lên: 01/04/2014, 12:20

Ngày tải lên: 06/07/2014, 06:21

... Design an addressing scheme for an inter -network and assign ranges for hosts, network devices and the router interface Compare and contrast the importance of network designs H c vi n m ng Bách khoa ... Design an Addressing Scheme for an Inter -network • There are many reasons to divide a network into subnets: • ? – Manage Broadcast Traffic – Different Network Requirements – Security Counting ... ports H c vi n m ng Bách khoa - Website: www.bkacad.com Basic Network Media Required to Make a LAN Connection Factors to Consider in Choosing a Router • Similar to the switch, cost and interface...

Ngày tải lên: 22/12/2013, 13:17

... Another Layer of Addressing H c vi n m ng Bách khoa - Website: www.bkacad.com Layer addressing and its Impact on Network Operation and Performance Data Link Layer • OSI Data Link layer (Layer 2) ... c n m ng Bách khoa - Website: www.bkacad.com Layer addressing and its Impact on Network Operation and Performance Network Layer • Network layer (Layer 3) addresses, such as IPv4 addresses, provide ... is the lower Ethernet sublayer of the • • Data Link layer MAC is implemented by hardware, typically in the computer Network Interface Card (NIC) The Ethernet MAC sublayer has two primary responsibilities:...

Ngày tải lên: 22/12/2013, 13:17

... • To support a wide variety of network functions, the Data Link layer is often divided into two sublayers: an upper sublayer and an lower sublayer – The upper sublayer defines the software processes ... www.bkacad.com Connecting Upper Layer Services to the Media • • The Data Link layer exists as a connecting layer between the software processes of the layers above it and the Physical layer below it As such, ... completion of this chapter, you will be able to: • Explain the role of Data Link layer protocols in data transmission • Describe how the Data Link layer prepares data for transmission on network media...

Ngày tải lên: 22/12/2013, 13:17

... URL:http://mike.passwall.com/networking/netmodels/isoosi7layermodel.html [4] R Feig, “The OSI Reference Model”, Date Unknown, URL:http://www2.rad.com/networks/1994 /osi/ osi.htm [5] H S Ha, OSI Layer , 2000 URL:http://userpages.umbc.edu/~hha1 /network/ protocol.html ... Applying the OSI seven -layer model to Information Security Layer Four - Transport Layer fu ll r igh ts The Transport Layer is concerned with the transmission of data streams into the lower layers of ... Applying the OSI seven -layer model to Information Security Layer Six- Presentation Layer fu ll r igh ts The Presentation Layer deals with the organization of data passed from the application layer into...

Ngày tải lên: 05/03/2014, 21:20

... addresses Solution a There must be no leading zero (0 45) b There can be no more than four numbers c Each number needs to be less than or equal to 255 d A mixture of binary notation and dotted-decimal ... a 00000001 00001011 00001011 11101111 b 11000001 10000011 00011011 11111111 c 14.23.120.8 d 252 .5. 15. 111 Solution a The first bit is This is a class A address b The first bits are 1; the third ... 19.30 Figure 19.4 A network configuration for the block 2 05. 16.37.32/28 19.31 Note The first address in a block is normally not assigned to any device; it is used as the network address that...

Ngày tải lên: 06/03/2014, 12:20

... Internet as a Datagram Network Internet as a Connectionless Network 20.2 Figure 20.1 Links between two hosts 20.3 Figure 20.2 Network layer in an internetwork 20.4 Figure 20.3 Network layer at the source, ... 20-1 INTERNETWORKING In this section, we discuss internetworking, connecting networks together to make an internetwork or an internet Topics discussed in this section: Need for Network Layer Internet ... the source, router, and destination 20 .5 Figure 20.3 Network layer at the source, router, and destination (continued) 20.6 Note Switching at the network layer in the Internet uses the datagram...

Ngày tải lên: 06/03/2014, 12:20

... with a multicast address from 224.0.0.0 to 239. 255 . 255 . 255 is masked and delivered to the Ethernet interface 21 .50 Example 21.9 (continued) 21 .51 ... 130.23.43. 25 and physical address A4:6E:F4 :59 :83:AB The two hosts are on the same Ethernet network Show the ARP request and reply packets encapsulated in Ethernet frames Solution Figure 21 .5 shows ... of bytes as 64 This is the total number of bytes in the ICMP packet (56 + 8) 21.24 Example 21.3 (continued) 21. 25 Figure 21. 15 The traceroute program operation 21.26 Example 21.4 We use the traceroute...

Ngày tải lên: 06/03/2014, 12:20

... 22-1 DELIVERY The network layer supervises the handling of the packets by the underlying physical networks We define this handling as the delivery of a packet ... 22.2 Route method versus next-hop method 22 .5 Figure 22.3 Host-specific versus network- specific method 22.6 Figure 22.4 Default method 22.7 Figure 22 .5 Simplified forwarding module in classless ... 180.70. 65. 140 Solution The router performs the following steps: The first mask (/26) is applied to the destination address The result is 180.70. 65. 128, which does not match the corresponding network...

Ngày tải lên: 06/03/2014, 12:20

... these disparate networks onto one platform - a platform defined as a converged network 34 Converged Networks 35 Architecture of the Internet Network Architecture A fault tolerant network is one ... changing to keep up with the evolution of this global network Network Centric World Using Networks in our lives Using Networks in our work Networks are no longer just a luxury, but a necessity ... readdress 28 Network as a Platform What is Networking? Networking - the interconnection of workstations, peripherals, terminals and other devices Whatis.com: “In information technology, networking...

Ngày tải lên: 01/04/2014, 12:20

Ngày tải lên: 01/04/2014, 12:20

Ngày tải lên: 01/04/2014, 12:20