CN2668 Routers and Switches

1. CN2668Routers and Switches Kemtis Kunanuraksapong MSIS with Distinction MCTS, MCDST, MCP, A+

2. Agenda • Chapter 5: Router and IOS Basics • Exercise • Quiz

3. Benefits of Routing • Routers provide • Packet filtering • Connections between local networks • Traffic control • Wide area network (WAN) connections • Routers operate at the Network layer of the OSI reference model • Because of Network layer addressing, routers can direct packets to both local and remote segments

4. Cisco Router User Interface • Cisco Internetwork Operating System (IOS) • Provides a command-line interface (CLI) • You can access a router in several different ways • Console port (also known as the console) • Auxiliary port (AUX) • Virtual terminals (VTY) • Trivial File Transfer Protocol (TFTP) server • See Figure 5-1 on Page 119

5. System Configuration Dialog • If the router has not been configured previously, or if the startup file has been erased • The Cisco IOS will prompt you to run the initial configuration dialog after the router boots • You also can type Setup to configure as well • A series of prompts that guide you through the initial configuration for the router • If IOS 12.0, you have two setups • Basic management • Extended setup

6. User Interface • The initial prompt: • The host name of the router followed by the greater than symbol (>) • Default: router> • User EXEC mode (User mode) • When the prompt displayed is the greater than symbol • User mode does not allow you to configure the router only to check status and review settings

7. User Interface (continued) • The question mark activates context-sensitive Help on the Cisco router • Privileged EXEC mode • To enter privileged EXEC, you can type the enable command at the user mode prompt • Next, you may be prompted for a password • Greater than symbol (>) changes to a pound sign (#)

8. User Interface (continued) • The question mark activates context-sensitive Help on the Cisco router • Privileged EXEC mode • To enter privileged EXEC, you can type the enable command at the user mode prompt • Next, you may be prompted for a password • Greater than symbol (>) changes to a pound sign (#)

9. User Interface (continued) • In Privileged EXEC mode • Setup command will cause the router to enter the system configuration dialog • Copy configurations can be copied from TFTP servers to the router and therefore change the router configuration • Erase configuration files as well as the entire IOS can be erased

10. Configuration Modes • Global configuration mode • Accessed by typing configure terminal at the enable mode prompt • Interface configuration mode • Allows you to configure the Ethernet and serial interfaces on your router • Line configuration mode • Allows you to configure the virtual terminals, console, and AUX lines that let you access the router

11. Configuration Modes (continued) • Typing exit will take you back one level • Typing end or pressing the Ctrl+Z keys will take you all the way back to the enable prompt • Abbreviated commands • Such as conf t, en, shru • The router will show you the point at which you entered an incorrect character

12. Plethora of Passwords • 5 passwords you can set • Enable • Enable Secret • Console • Aux • Virtual Terminal (VTY) • Use service password-encryption if you want to encrypt all passwords

13. Plethora of Passwords • Enable Password and Enable Secret Password configuration • You can set both passwords from the global configuration mode prompt • You can type no enable secret and no enable password at the global configuration mode prompt • To remove the enable secret and enable passwords

14. Plethora of Passwords (continued) • Setting Line passwords • You can set passwords for each line used to configure the router • Configure the console line password • Enter line con 0 • You can also configure passwords on the five virtual terminal lines that exist on every router • Enter line vty 0 4

15. Enhanced Editing • The enhanced editing commands let you jump to the beginning or end of a command line • You can also jump forward or back, character by character, or word by word • You can turn off the enhanced editing features by typing terminal no editing at either the user EXEC or the privileged EXEC prompts • You can turn on terminal editing by typing terminal editing • See Table 5-3 on Page 129

16. Command History • Command history • Allows you to retrieve previously typed commands • You can see up to 10 previously typed commands by typing show history • To modify the number of commands stored by the router, you can use the terminal command • Up to 256 previous commands • Type terminal history size n

17. Configuring Router • Router host name • Default host name is router • To set the router host name, type hostname followed by the name that you want to set • Configure a banner • A banner is a message that you can configure to display each time someone attempts to log in to the router • Enter global configuration mode by typing config t • Then type bannermotd, followed by a space and a delimiting character

18. Configuring Router (Cont.) • Configure an interface description • Use the description command • The interface description helps you remember which network the interface services • Use the clock set command in enable mode to configure the time • You must be in global configuration mode to configure the time zone • See Figure 5-14 on Page 132

19. Router Components • ROM • Contains the bootstrap • Not modified during normal operations, but it can be upgraded with special plug-in chips • Flash memory (EPROM) • Contains the working copy of the current Cisco IOS • Is the component that initializes the IOS for normal router operations

20. Router Components (Cont.) • NVRAM • Contain the startup configuration file for the router and IOS uses it during boot process • RAM/DRAM • Changes to the router’s running configuration take place in RAM/DRAM • Interfaces

21. Assignment • Review Questions • 1 – 24 • Case Projects • 5 • Lab 5.1, 5.3 – 5.5