release 16/07/2009jetking infotrain ltd. assembling and cabling cisco devices chapter 3
TRANSCRIPT
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
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
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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
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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
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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
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Switches
Types of Switching
Cut through Switch
Store and ForwardSwitch
Fragment FreeSwitching
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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
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Routers
The functions of routers are: Provide traffic management Do not pass broadcast traffic Connect different network segments
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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.
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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
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Suggested Solution The network administrator suggests that he had
configured a Cisco 1700 series router and it can be connected to the LAN.
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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
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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
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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
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
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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
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