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Certi cation Summary
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The router needs an IP address on each interface where it will be processing IP traffic This is configured on an interface with the ip address command Use the show ip interface brief command to view the status and configuration of your interfaces A router-on-a-stick uses a single trunk connection from a router to a switch to route among multiple VLANs You must create a subinterface on your router for each VLAN Each subinterface requires the encapsulation isl|dot1q command and a layer 3 address or addresses
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16: Initial Router Con guration
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TWO-MINUTE DRILL
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ROM stores the Mini-IOS, the bootstrap program, ROMMON, and POST Flash stores the IOS images NVRAM stores the configuration files RAM stores the active configuration, including tables and buffers
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The configuration register and boot system commands can be used to
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override the default router bootup behavior
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Use the show version command to see the IOS version being used by the
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router as well as the register value
If the fourth hexadecimal character of the configuration register is 0x0, the
router boots into ROMMON mode; if 0x1, the router boots the Mini-IOS or the first file in flash if a Mini-IOS doesn t exist; if 0x2 0xF, the router uses the default boot sequence The default configuration register value is 0x2102 For the password recovery, it s 0x2142 Use the config-register IOS command to change this value
Here is the default bootup process: The bootstrap program examines the
configuration register to determine how to boot up If it is the default, the bootstrap program looks for boot system commands in the configuration file in NVRAM If none are found, it looks for the IOS in flash If no files are found in flash, the bootstrap program generates a TFTP local broadcast to locate the IOS If no TFTP server is found, the bootstrap program loads the Mini-IOS in ROM If there is no Mini-IOS in ROM, the bootstrap program loads ROMMON
The System Configuration Dialog (setup script) will run when the router
boots up and there is no configuration file in NVRAM
Use the confreg command from ROMMON mode to change the
configuration register to 0x2142 to perform the password recovery process
Two-Minute Drill
AutoSecure
AutoSecure puts a basic security configuration on a router, such as passwords,
CBAC, ACLs, SSH, and other information It is run from Privilege EXEC mode using the auto secure command
Router Configuration
IP addresses are configured on each interface of the router that will process IP
packets with the ip address Interface Subconfiguration mode command The bandwidth command changes the metric of the interface, which is used by some routing protocols
The show ip interface brief command displays a brief configuration
and status of each interface on the router
Router-on-a-Stick
A router-on-a-stick is a router with a single trunk connection to a switch; a
router routes between the VLANs on this trunk connection
To route between VLANs with a router-on-a-stick, use subinterfaces and
specify the VLAN with the encapsulation isl|dot1q command on the subinterface
16: Initial Router Con guration
SELF TEST
The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question
Router Hardware Components
1 Which of the following are stored in ROM (choose two) A B C D A B C D POST ROMMON Configuration file System recovery file NVRAM ROM RAM Flash
2 Which type of memory does not maintain its contents during a power-off state
Router Bootup Process
3 Which router command would you use to view the configuration register value A B C D show show show show register interfaces configuration version
4 Enter the router IOS Configuration mode command to change the configuration register to 0x2142: __________
AutoSecure
5 When is AutoSecure run on a router A B C D Manually from Privilege EXEC mode Manually from Configuration mode Automatically when the router boots up without a configuration Automatically when the router boots up without a configuration or manually from Privilege EXEC mode
Self Test
Router Configuration
6 You need to configure an IP address on a router s serial interface (s0/0) Use the last host address in 1921681128/30 The interface is a DCE and you need to enable the interface The speed of the connection is 64 Kbps Set the bandwidth metric to match the speed of the interface Enter the commands to accomplish this 7 Enter the router Global Configuration mode command that will allow you to use the first address in the first subnet of a subnetted C class network: __________ 8 Examine this output:
Interface Ethernet0 Ethernet1 IP-Address OK Method Status Protocol 19216811 YES NVRAM up up 19216821 YES NVRAM administratively down down
Enter the router command that created this output: __________
Router-on-a-Stick
9 When configuring a router-on-a-stick, the configuration is done on __________ A Physical interfaces B Major interfaces C Subinterfaces 10 Which router-on-a-stick command defines the VLAN for the interface A B C D vlan encapsulation trunk frame-type
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