Assembling and Cabling Cisco Devices

Chapter 3

Chapter 3 2

Chapter Objectives

Explain Network Devices Connect Network Devices to the Router Explain WAN Devices Compare the Network Devices

Chapter 3 3

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

Chapter 3 4

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

Chapter 3 5

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

Chapter 3 6

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

Chapter 3 7

Switches

Types of Switches

Managed Unmanaged

Chapter 3 8

Switches

Types of Switching

Cut through Switch

Store and ForwardSwitch

Fragment FreeSwitching

Chapter 3 9

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

Chapter 3 10

Routers

The functions of routers are: Provide traffic management Do not pass broadcast traffic Connect different network segments

Chapter 3 11

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.

Chapter 3 12

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

Chapter 3 13

Suggested Solution The network administrator suggests that he had

configured a Cisco 1700 series router and it can be connected to the LAN.

Chapter 3 14

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

Chapter 3 15

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

Chapter 3 16

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

Chapter 3 17

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

Chapter 3 18

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

Chapter 3 19

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