LAN Design of a Local High School Martin Kucek Chris C. Yu Sandy Ramirez Cisco TCS Project – Semester 3 © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

2 General Requirements Design the LAN at a minimum of cost to the school serving 306 nodes (288 workstations for students, 12 workstations for teachers, 3 servers, 3 printers) A minimum of 1.0 Mbps to any host computer in the LAN and 100Mbps to any server host in the LAN Access to the Internet from any host computer in the LAN Implementing an enterprise server (DNS/ ) and workgroup servers (Staff, Students) Implementing TCP/IP routed protocol Functionality of the LAN for a minimum 7-10 years: – 100% growth in LAN throughput – 1000% growth in the Internet connection throughput © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

3 General LAN Design Goals Functionality: The network must work. The network must provide user-to-user and user-to-application connectivity with reasonable speed and reliability. Scalability: The network must be able to grow. The initial design should grow without any major changes to the overall design. Adaptability: The network must be designed to accommodate future technologies, and it should include no element that would limit implementation of new technologies as they become available. Manageability: The network must be monitored and managed to ensure ongoing stability of operation. © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

4 Security Requirements 2 LAN segments in the school 2 VLANs for secure separation between: – Student/curriculum VLAN#2 – Staff/administrative VLAN#3 Access from the Internet to LAN not allowed Administrative Server must be accessible only to staff Student Server must be available to the entire school network © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

5 School Layout One 3-floor building Each floor has 4 identical classrooms MDF – 2 nd floor IDF – 1 st and 3 rd floor Classrooms: 24 workstations for students 1 workstation for teacher (staff) 24-port hub located in a lockable cabinet 4 cable runs to each classroom (two cable runs reserved) Printers location: 1 st floor : classroom nd floor : classroom rd floor : classroom 308 © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

6 Main Distribution Facility (MDF) Central Point of wires termination Router Cisco 2621 (Dual 10/100 Fast Ethernet Ports, 2 Serial Ports) Switch Catalyst 2912 (12 autosensing ports 10/100 Mbps) Hub 3Com Dual Speed (8 autosensing ports 10/100 BASE-TX, RJ-45) VCC (Vertical Cross Connect) HCC (Horizontal Cross Connect) POP (Point of Presence) DNS Server/ Server Student Server - Curriculum Staff Server – Administration UPS Backup Tapes © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

7 Intermediate Distribution Facility (IDF) Switch Catalyst 2912 (12 autosensing ports 10/100 Mbps) Hub 3Com Dual Speed (8 autosensing ports 10/100 BASE-TX, RJ-45) VCC (Vertical Cross Connect) HCC (Horizontal Cross Connect) UPS © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

Cut Sheet of a floor Cut Sheet of a floor © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

LAN Physical Topology © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

10 LAN Cabling Vertical Cabling (Backbone): Cabling between MDF & IDFs 100BASE-T ports: RJ-45 connectors; two-pair Category 5 UTP cabling Horizontal Cabling: Cabling between hosts and MDF (IDFs) conducted in drop ceilings 100BASE-T ports: RJ-45 connectors; two-pair Category 5 UTP cabling © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

LAN Scheme © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

12 Cut Sheet for IDF 1 (1 st floor) © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

13 Cut Sheet for MDF (2 nd floor) © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

14 Cut Sheet for IDF 2 (3 rd floor) © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

15 IP Addressing Scheme 2 class C addresses: Network 1: Network 2: Network 1 - (floor 1 & 2, router interface - E0): Host range of – (254 nodes) Network 2 - (floor 3, router interface - E1): Host range of – (254 nodes) © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

16 IP Addressing Scheme (cont.) Network 1 (floor 1 & 2): Router E0: Router S0: Router S1: not assigned Switch 1: Switch 2: DNS/ Server: (Shared) Students/Curriculum Server: (Shared) Staff/Administrative Server: (VLAN#2) Printer 1: (Shared) Printer 2: (Shared) (VLAN#2 Staff/Administrative) assigned IP in range of: – (8 nodes) (VLAN#3 Students/Curriculum) assigned IP in range of: – (236 nodes) © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

17 IP Addressing Scheme (cont.) Network 2 (floor 3): Router E1: Switch 3: Printer 3: (Shared) (VLAN#2 Staff/Administrative) assigned IP in range of: (4 nodes) (VLAN#3 Students/Curriculum) assigned IP in range of: (246 nodes) © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

18 Security Solution Secure separation between students and staff/administrative: - done by VLANS Firewall: Create Access Control List to deny external access to local LAN: access-list 1 permit access-list 1 permit int E0 ip access-group 1 in int E1 ip access-group 1 in © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

19 LAN Equipment Costs © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

20 Network Analysis Advantages: The bandwidth is well surpassing the requirement for each host from the outset. Security and efficiency are enhanced through switching and VLANs. Reserved cables are already in place for effortless expansion. The entire design is highly economical and cost effective for any budget strapped school. It is a simple, inexpensive and high performance small network. Disadvantages: No redundancy to the Internet - if the WAN link fails, access to the resources outside the LAN is lost. Student Workstations - Classroom Collision Domain © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved

21 The End Questions??? Shoot!!! © 2001 Martin Kucek / Chris C. Yu / Sandy Ramirez. All Rights Reserved