The chapter discusses different networking devices used to connect networks and their functions. It explains that hubs connect multiple network segments but only one device can transmit at a time. Switches improve on hubs by examining address information and reducing collision domains. Routers forward data between networks by maintaining routing tables. WAN devices like switches, modems and CSUs are used to connect networks over long distances.

1. Assembling and Cabling Cisco
Devices
Chapter 3

2. Chapter Objectives
 Explain Network Devices
 Connect Network Devices to the Router
 Explain WAN Devices
 Compare the Network Devices
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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
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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
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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
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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
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7. Switches
Types of Switches
Managed Unmanaged
Chapter 3 7

8. Switches
Types of
Switching
Cut Store and Forward Fragment Free
through Switch Switch Switching
Chapter 3 8

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
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10. Routers
 The functions of routers are:
 Provide traffic management
 Do not pass broadcast traffic
 Connect different network segments
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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.
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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
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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 13

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
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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
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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
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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
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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
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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
Chapter 3 19