Diploma in Information Technology

Principles of Information Systems and Data Management

Classroom Local Area Network &

Internet

Network Diagrams

Components

• Firewall• Router• Core Switch• Distribution Switch• Access Switch• Cables

Firewall

• is simply a program or hardware device that filters the information coming through the Internet connection into your private network or computer system.

• If an incoming packet of information is flagged by the filters, it is not allowed through.

Firewall

CISCO ASA 5510 BUN - K9 Series

Router

• A device that forwards data packets along networks.

• is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISP.

Router

CISCO 2911

Core Switch

• This layer is considered the backbone of the network and includes the high-end switches and high-speed cables such as fiber cables.

• This layer of the network does not route traffic at the LAN. In addition, no packet manipulation is done by devices in this layer.

• Rather, this layer is concerned with speed and ensures reliable delivery of packets.

Distribution Switch

• This layer includes LAN-based routers and layer 3 switches.

• This layer ensures that packets are properly routed between subnets and VLANs in your enterprise.

• This layer is also called the Workgroup layer.

Core & Distribution Switch

Access Switch

• This layer includes hubs and switches.

• This layer is also called the desktop layer because it focuses on connecting client nodes, such as workstations to the network.

• This layer ensures that packets are delivered to end user computers.

Access Switch

Cables

• RJ45 & Fiber

Reference

• http://www.ciscoguard.com/ASA-5510.asp• http://www.cisco.com/en/US/products/index.

html• http://compnetworking.about.com/cs/lanvlan

wan/g/bldef_lan.htm• http://searchnetworking.techtarget.com/

definition/local-area-network-LAN