• Exterior Gateway Protocol• Border Gateway Protocol (BGP)

• Interior Gateway Protocol• Routing Information Protocol (RIP)• Enhanced Interior Gateway Protocol (EIGRP)• Open Shortest Path First (OSPF)• Intermediate System to Intermediate System (IS-

IS)

• A switch is a layer 2 (L2) device that is used to connect computers, printers and servers within a building or campus.

• L2 address is the Ethernet MAC address• A switch contains physical interfaces called ports and

communicates via frames. • L2 switches make their forwarding decisions based

on tables that store the mapping between MAC addresses and switch ports.

• Multilayer switches, making the forwarding decisions based on the L3.

• Routers/Switches depend on two types of software for their operation: IOS and configuration file

• The Cisco Internetwork Operating System (IOS) is the system software in Cisco devices.

• Configuration files contain the Cisco IOS software commands used to customize the functionality of the Cisco device.

• A network administrator creates a configuration file that defines the desired functionality of a Cisco device.

• The IOS is generally accessed using a Command Line Interface (CLI). (GUI – SDM, CCP)

• To access the CLI environment. • Console - the default location for performing device

management and configuration.• VTY (virtual terminal line) – allows remote

administration via Telnet or SSH• AUX port (router only)

• A Cisco network device contains two configuration files:

• The running-config (RAM• The startup-config file (NVRAM) - used as the

backup configuration and is loaded when the device is started.