Cisco routers (R1)

Networking routers hub simple cpu modest performance

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Unformatted text preview: 6 George Blankenship 2 CSCI 232 - Computer Networking Routers Hub • Simple CPU (modest performance) – All messages received are relayed to all other line interfaces – Collision is detected when two interfaces pass message to CPU simultaneously • Manageable – Implements TCP/IP – SNMP and Telnet Routers George Blankenship 7 Switch • Complex CPU (high performance) – Learns network topology – Collisions are avoided by using only the interface needed to forward message – Able to create virtual LANs (VLANs) • Manageable – Implements TCP/IP – SNMP and Telnet Routers George Blankenship 8 Router • Complex CPU (high performance) • Implements network layer – Learns network topology through configuration file and routing protocol – Forwards datagrams based upon routing table • Manageable – Implements TCP – SNMP and Telnet Routers George Blankenship 9 George Blankenship 3 CSCI 232 - Computer Networking Routers Firewall • Special router – Bastion host – protects other systems from malicious tampering – Defines the DMZ • IP blocking – IP address rejection • Port blocking – Active open blocking – State analysis Routers George Blankenship 10 Cisco IOS • Operating system for the router and switch – Character oriented user interface – Web interface available – Software features to support specialized interfaces • Configuration file defines the operational environment of the router (and switch) Routers George Blankenship 11...
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