Lab 5 : Networking Devices

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HWD101-Lab 5 – Networking Devices
There are four major networking devices. They are: Hubs, Switches, Routers, Bridges
1) How does a hub work?
Ans: The common connection point for devices in a network is called hub and are usually used to connect sections of a LAN. A hub contains many ports. When a packet arrives at one port, it is copied to the other ports so that all parts are visible to the LAN. A hub just takes the data that comes into a port and transmits it out all the other ports. In a hub, a frame is passed to every one of its ports. It doesn 't matter that the frame is only destined for one port. The hub has no way of differentiate which port a frame should be sent to. So it passes it to every port to ensure that it reaches its
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It works at the logical level that is the layer 2 in the OSI model, which means that it can filter frames so that it passes only that data whose destination address matches to a machine located on the other side of the bridge. It is also used to segment a network, holding back the frames intended for the local LAN while transferring those meant for other networks. This reduces traffic on all networks, and increases the level of privacy.

5) There are 7 layers to the OSI Model. Name them, and give some protocols that exist at each layer, as well as a physical device that ‘exists’ at each layer. Some layers may NOT have a device, so in this case, write in NA (not applicable)
#

Name
Protocols that ‘exist’ at this layer
Devices that ‘exist’ at this layer
Name of the Datagram
7

(A)pplication
HTTP, FTP, SNMP, TELNET, DHCP, IMAP, POP3, DNS
NA
Data
6

(P)resentation
TLS , SSL
NA
Data
5

(S)ession
Netbios and PPTP
NA
Data
4

(T)ransport
TCP, UDP
NA
Segment
3

(N)etwork
IP, ARP, IPSec, Appletalk and ICMP
Routers
Packet
2

(D)atalink
PPP, Ethernet and ATM
Switch or Bridge
Frame
1
(P)hysical

Ethernet, USB , Bluetooth, IEEE 8.2.11
Network Cards
Bit

6) What is a broadcast domain? Any computer that is connected to a router is a member of the same broadcast domain.
Ans: A broadcast domain is a rational division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. It can be within the
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