Transcript Slide 1 - IT, Sligo

IT. Support
Networking
Threaded Case Study
School: R.E. Miller
By:
Shane Coyne.
Andrea Martyn.
Gary Hall.
Barry Gray.
Presented by:
Gary Hall & Andrea Martyn
On Fri 6th June 2003 @ 11:45am
WAN TOPOLOGY
(Wide Area Network)
SECTION 1.
Wide Area Network (WAN)
The WAN will connect the schools and the administrative offices with
the district office for the purpose of delivering data
The WAN will be based on two layer hierarchical model.
TCP/IP & Novell IPX are the only protocols accepted for WAN
IGRP is the routing protocol we used for the WAN
•3 Regional Hubs.
•Phoenix N. W (data centre)
•Greenway (service centre)
•Shaw Butte school
Logical Addressing Scheme
•
•
We have decided to use a class c
addressing scheme
10.10.1.x – students
10.10.2.x – teachers/admin
LAN TOPOLOGY
(Local Area Network)
Local Area Network (LAN) & Wiring Scheme
Cable types for transport:
1) Ethernet 10base-t
2) 100base-TX
3) 100base-FX
Horizontal cabling: cat 5 unshielded twisted pair(100mb)
Vertical (backbone) cabling: fiber optic multimode cable
MDF at central point of LAN (all cabling will be terminated here)
POP (point of presence) for wan will be at the MDF.
Routers/LAN switches will be placed in the MDF
There will be three IDFs at the re miller
Each room must have 4 cat 5 UTP cable runs, with one terminated at the teachers
workstation. The other three are for the students.
A total of 325 computers will be installed at the R.E.Miller school.
Servers
DNS/E-mail Server
Each school will contain a host for DNS and e-mail service (local post office /
mail server) Enterprise Server. (One Machine can handle both DNS and E-Mail)
DNS update process will flow from individual school to the hub server then to the
district hub.
All regional Hubs can use Mesh topology.
Administrative Server
Each School should contain an Administrative Server.
Server will run TCP/IP as its OSI Layer 3 & 4 protocols.
Library Server
Online information / retrieval system (Enterprise Server).
Uses Layers 3 & 4 (TCP/IP) of the OSI model.
Application Server
Located at central location (Enterprise Server).
Will run programs such as word, excel, and power point.
Other Servers
All other servers will be departmental servers (Workgroup Servers).
Security
•Utilize a double firewall implementation.
•Internet-exposed applications residing on a public backbone network.
•All connections initiated from the Internet into the schools private network will be refused.
•3 logical network classifications: administrative, curriculum, and external (with secured
•connections between them)
•2 physical LAN infrastructures 1 administrative and 1 curriculum.
•Place each server according to its function and placed on the appropriate LAN.
•Each School should have a file server.
•Using ACL on routers all traffic from the curriculum LAN will be prohibited on the
admins LAN.
•E-Mail and directory service should pass freely between the two physical LANS.
•ACL’s are to be controlled at the District office (TFTP).
•A user ID and Password policy will be published and strictly enforced on all computers
LAN TOPOLOGY
(Local Area Network)
Main Distribution Facility (MDF)


The storage space which contains the hardware
for the main hub of the network.
In the next floor plan, the rooms shaded in blue
represent data media termination points. The
Red shaded represents the POP. This will also be
the location of the MDF (Main Distribution
Facility).
MDF
2 LanSwitch 3548 XL enterprise edition
Cisco 3660 6-slot Modular Router-AC
Intermediate distribution facility
(IDF)
 The
central point of a star
topology where the hub is
located.
 There
should be one on each
floor and/or within a 1000 sq.
meter radius.
(IDF)
2 Patch Panel 64 RJ-45 ports
2 LanSwitch 3548 XL Enterprise Edition
In this room, the location of the MDF to the rooms is more than 90m, so
two IDFs are needed to connect the rooms. The green shading
represents the rooms connected with the IDF to the far left.
Wiring Diagram
Logical Topology (Star Topology)
Equipment required
Server: 1.5GHz Intel® Pentium® 4 Processor with 512MB Ram, an ATI
Radeon 32Mb Video and
80GB of Drive Space.
Switch: 24-port 10/100 Base-TX Fast Ethernet Switch.
Patch Panel: CTG's Enhanced CAT5 with 110-Type termination, meeting and
exceeding EIA/TIA TSB-40 CAT5e connecting hardware specifications.
Why use Vlans?
 They
logically segment the Network
 Can use existing hubs & switches
 Control Broadcasts ( prevent who the
data is sent to Eg prevent students
getting access to the administration
network)
 Save money because less
administration depending on if port
centric, static or dynamic
VLAN’s
Two VLANS are required
 Curriculum
– Student
 Administrative
– Teachers, Admin staff
Access Control Lists (ACL’s)
 Allows
us to permit or deny users /
or an entire network from the
network.
 Limits traffic on the Network,
therefore increasing the network
performance.
 Can be standard (1-99) or Extended
(100-199)
Who gets Access to what?

Students Access
– Application Sever
– Internet
– Library

Students Denied
– Activity on the DNS server
– Administrative server

Teachers Access
–
–
–
–
–
Internet
DNS server for e-mail
Administrative server
Application server
Library server
Sample ACL

This prevents students accessing the
administration network
Access-list 101 deny ip 10.10.1.2
0.0.0.255 10.10.2.3 0.0.0.255
 Permit any any
 Int EO
 Access group 101 in
 Exit

Interior Gateway Routing Protocol
(IGRP)
A proprietary interior gateway protocol
used to exchange information
between Cisco systems routers.
Is responsible for sending & receiving
enhanced IGRP packets
IGRP Configuration
Done at global config mode
Re_Miller(config)#
Re_Miller(config)#
128.168.1.0
Re_Miller(config)#
128.168.2.0
Re_Miller(config)#
router igrp 108
Network
Network
Exit
Pro’s

The benefits of setting up the network as
shown are:
– Speed: with fiber going to each switch, there is
1 gigabit of bandwidth available with possible
improvements in technology.
– Less interference: fiber has less interference
from magnetic fields, etc.
– Non-centralized: control is closer, if there is a
local problem
– Room for future growth in LAN and WAN.
Con’s

The negative aspects of setting up the
network as shown are:
– Non-centralized: with an IDF in each building
there may be difficulty locating a problem.
– Varied equipment: with 4 different models of
switches there will be additional programming
time needed.
– Cost: the quantity of switches and fiber
needed has increased the cost.
– Security: with many locations, there is more of
a possibility of break-in or theft.