1. Release 16/07/2009Jetking Infotrain Ltd. Assembling and Cabling Cisco Devices Chapter 3

2. Release 16/07/2009 Jetking Infotrain Ltd. Chapter Objectives Explain Network Devices Connect Network Devices to the Router Explain WAN Devices Compare the Network Devices

3. Release 16/07/2009 Jetking Infotrain Ltd. Recall - I Different layers of TCP/IP stack include:  Application layer  Transport layer  Internet Layer  Network interface layer Protocols that function at the application layer are:  Hyper Text Transfer Protocol (HTTP)  Simple Network Management Protocol (SNMP)  File Transfer Protocol (FTP)  Telnet

4. Release 16/07/2009 Jetking Infotrain Ltd. Recall - II Protocols that function at the transport layer include:  TCP  User Datagram Protocol (UDP) Protocols that function at the internet layer include:  Address Resolution protocol (ARP)  Reverse Address Resolution Protocol (RARP) IP address is a 32-bit binary number that is unique for each device Smaller groups of a large network are known as subnets

5. Release 16/07/2009 Jetking Infotrain Ltd. Hubs A hub joins multiple network segments together to form a single segment At a particular time, only one computer connected to the hub can transmit data The number of ports in a hub range from 4 to 24

6. Release 16/07/2009 Jetking Infotrain Ltd. Switches Switches are data-link layer devices that connect multiple LAN segments to form a single network segment Switches examine the data packets for source and destination addresses Switches minimize the possibility of collisions of data packets by reducing collision domains

7. Release 16/07/2009 Jetking Infotrain Ltd. Switches Types of Switches ManagedUnmanaged

8. Release 16/07/2009 Jetking Infotrain Ltd. Switches Types of Switching Cut through Switch Store and Forward Switch Fragment Free Switching

9. Release 16/07/2009 Jetking Infotrain Ltd. Routers Routers are devices that forward data to their appropriate destinations Routers decide the best possible route that a packet needs to take to reach its destination Routers maintain a routing table to decide the route for the data

10. Release 16/07/2009 Jetking Infotrain Ltd. Routers The functions of routers are:  Provide traffic management  Do not pass broadcast traffic  Connect different network segments

11. Release 16/07/2009 Jetking Infotrain Ltd. Case Study The Blue Diamond Steel Company has decided to shift the Finance department from the Hyderabad branch to the primary branch in Gujarat. Suddenly, the LAN connected to the finance department was not processing any requests. This lead to delay in sending the payroll details to HR department in Hyderabad and Gujarat.

12. Release 16/07/2009 Jetking Infotrain Ltd. Problem After troubleshooting the router connected to the LAN of finance department, the network administrator identified that the router gets heated up this is stopping the transfer of information between the networks

13. Release 16/07/2009 Jetking Infotrain Ltd. Suggested Solution The network administrator suggests that he had configured a Cisco 1700 series router and it can be connected to the LAN.

14. Release 16/07/2009 Jetking Infotrain Ltd. Repeaters Repeater is a device that increases the strength of the data signals sent across the network It obtains a weak signal from the network, amplifies it and passes it on to the next network segment

15. Release 16/07/2009 Jetking Infotrain Ltd. WAN Devices Wide Area Network (WAN) is a communication network that spans over a wide geographical area WAN technologies function at the lower three layers of the OSI model, the physical layer, the data link layer and network layer Devices that are used in WAN are  WAN Switch  Access Server  Modem  Channel Service Unit  ISDN Terminal Adapter

16. Release 16/07/2009 Jetking Infotrain Ltd. Bridges Bridges are devices that divide the network into different segments thereby, enabling you to reduce traffic on the network It decides the network segment where the data has to travel in order to reach its destination It verifies the source and destination addresses of the data packet from the routing table that it builds

17. Release 16/07/2009 Jetking Infotrain Ltd. Summary - I A hub joins multiple network segments together to form a single segment The active hubs regenerate the signals sent over the network reducing attenuation Attenuation refers to the phenomenon of weakening of signals transmitted over the network Passive hubs do not regenerate the signals but pass them on to all the ports on the network Hybrid hubs enable you to create a hub-based network

18. Release 16/07/2009 Jetking Infotrain Ltd. Summary - II Switches are data-link layer devices that connect multiple LAN segments to form a single network segment Collision domains are the network segments between two network devices Microsegmentation is a technique by which the switches cut down the collision domain into smaller segments Routers are devices that forward data to their appropriate destinations using a process known as routing

19. Release 16/07/2009 Jetking Infotrain Ltd. Summary - III A repeater is a device that amplifies the data signals that are sent across the network WAN or Wide Area Network is a communications network that spans over a wide geographical area Channel Service Unit (CSU) device provides a digital interface for connecting routers to digital circuits ISDN Terminal Adapter enables you to connect an ISDN interface to a router