ITS270HW7
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Purdue University, Northwest *
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Computer Science
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Dec 6, 2023
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ITS 270
Homework 7
Please put Course number, your Full Name, Assignment number on top right. Submit your homework on
Blackboard Learn using file name as “ITS270HW7FirstNameLastName.(doc, docx)”. Any failure to do so
will result in deduction. Please show all your work for full credit.
1.
Explain how LAN reduce the broadcast traffics. (5 points)
Stations (host, server, etc.) could move anywhere without changing IP address.
Within the switched network, VLANs provide segmentation and organizational flexibility.
Group switch ports and assign them into logically defined communities of interest.
2.
Briefly discuss the advantages of VLAN. (5 points)
Security
Improve performance
Improve manageability
Flexible
Make it simple
Easier fault management
3.
Briefly discuss the “VLAN Trunking” and explain why it is important in VLAN configuration. (5
points)
Switch can distinguish traffic from different broadcast domains
Forwarding decision is based on VLANS
Between switches, BLAN information should be carried with packet to maintain the proper segregation.
This process is called VLAN “Trunking”
4.
Discuss the difference between access port and trunk port. (5 points)
The access port belongs to and carries the traffic of only one VLAN and provides the access to end
station which does ot need to understand the VLAN. A trunk port carries the traffic of multiple VLANs at a
time and used to connect switches to other switches or to the routers if necessary. This port support
tagged and untagged traffic.
5.
Briefly discuss the purpose of frame tagging in VLAN. What are the two types of Frame tagging?
(5 points)
The purpose of frame tagging in VLAN is that it is used to transmits message between
switches containing VLAN information. VLAN Tag, helps networks send the data packets, First
switch adds tag, Last switch removes tag.
6.
Discuss the difference between 802.1Q and ISL. (5 points)
802.1Q
Supports: port based, MAC address based
Uses VLAN tags
4-bytes of VLAN tag is added in frame
ISL
Enable VLANs across a switched network backbone
Cisco proprietary
ISL header is adding to encrypted original data
7.
Consider below network configuration where PC A is in VLAN 10 and PC B is in VLAN 20 and the
transmission from PC A to B.
PC A
PC B
Router
MAC address
00D0.5849.CBCA
0040.0B53.99C9
000A.F356.9601
IP address
192.1698.10.5
192.168.20.10
192.168.10.1
192.168.20.1
a.
What are the source and destination of IP and MAC addresses of the packet PC A
transmitting?
(5 points)
MAC address
IP address
Source
Destination
Source
Destination
00D0.5849.CBC
A
(PC-A)
000A.F356.9601
(Router)
192.1698.10.5
(PC-A)
192.168.20.10
(PC-B)
b.
What are the source and destination of IP and MAC addresses of the packet PC B
receiving?
(5 points)
MAC address
IP address
Source
Destination
Source
Destination
000A.F356.9601
(Router)
0040.0B53.99C9
(PC-B)
192.1698.10.5
(PC-A)
192.168.20.10
(PC-B)
8. Consider the network configuration shown below and VLAN information shown below.
Switch 1: Vlan 10, Vlan 20
Switch 2: Vlan 10, Vlan 20
Switch 3: Vlan 10, Vlan 20
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