How to setup WAN at home

LAN and WAN are similar layer 1 and layer 2 technology. Small company usually use a leased line to connect the LANs in their branch offices cross a WAN.

Knowing the following 3 factors, you should be able to setup a WAN lab at home.

1. The leased line service conceptually acts as a full-duplex crossover Ethernet link between two routers. 
2. Another factor about WAN is you need a CSU/DSU device. A CSU/DSU is a digital signal processing device. The DSU portion is responsible for timing, and actually connects to the DTE router via its serial port. The CSU portion is responsible for terminating the service provider’s link, and handles transmitting and receiving data from the DCE switch over the WAN link.
3. The DCE cable has a female connector, while the DTE cable has a male connector. You can plug the DTE cable directly into the DCE cable, skipping the CSU/DSU device. As a result, the WAN link is conceptually two routers linked by a cross over cable.

Follow the following guidelines, you should be able to figure out how to setup the network:

• You need to get these equipment from your friends, cisco, ebay, craggiest, amazon etc: one DCE/DTE DB60 Crossover Cable, two cisco routers with WIC-2T interface.
• Now you can plug one side of the crossover cable into one cisco router's  DB-60 port. This router will acts as the service provider's DCE switch; you then plug the other end of the crossover cable into another cisco router's DB-60 port. This router will act as the organization's DTE router. 
• The only problem at this point is, you don't have DSU to provide timing. Don't worry, you can configure serial clocking using the "clock rate 128000" command on the router that act as the DCE switch. The rest of the configuration is the same as connecting two routers with serial connection.

R1(config-if) # interface S0/0/1

R1(config-if) # ip address 172.16.3.1 255.255.255.0

R1(config-if) # clock rate 128000

R1(config-if) # no shutdown

Answers for Interconnecting Cisco Networking Devices (ICND) Practice Questions-Module 6

Exam Source
Legend answer   Correct answer   Your answer, Correct.   Your answer, Incorrect.
1. Which two statements are true of CDP? (Choose two.)
	CDP is a proprietary protocol.
	CDP is an open protocol standard.
	CDP discovers information about directly connected Cisco devices.
	CDP discovers information about all devices on the network.
	CDP runs over the network layer.
2. How could you obtain CDP information about a remote device that is not directly connected?
	Use the command show cdp neighbors’ address.
	Use the command show cdp neighbors’ hostname.
	Use the command show cdp neighbors’ next-hop.
	It is not possible to obtain CDP information about a remote device.
3. Which two pieces of information are included in a CDP update packet? (Choose two.)
	platform
	routing updates
	device identifiers
	MAC Address list
	link speed
4. Which command disables CDP on the device as a whole?
	no run cdp
	no cdp run
	no cdp enable
	no cdp execute
5. What does the command cdp enable do?
	disables CDP on a specific interface
	enables CDP on the device as a whole
	enables CDP on an individual interface
	enables CDP on a specific type of interface
6. Which Cisco IOS command produces the same result as the show cdp neighbors detail command?
	show cdp traffic
	show cdp entry *
	show cdp neighbors
	show cdp interface all
7. What keyword do you add to the show cdp neighbors command to obtain additional information in the output?
	full
	detail
	verbose
	complete
8. Which Cisco IOS command displays the frequency at which packets are sent?
	show cdp entry
	show cdp traffic
	show cdp interface
	show cdp neighbors
9. What information is included in the output of the command show cdp interface?
	remote port ID
	remote device ID
	encapsulation type
	number of CDP packets sent
10. Which command displays the device platform of a directly connected device?
	show cdp entry *
	show cdp traffic
	show cdp interface
	show cdp platform
11. Which command displays CDP packet checksum errors?
	show cdp entry
	show cdp traffic
	show cdp interface
	show cdp neighbors
12. Which three statements identify the primary uses of a network map? (Choose three.)
	tracks modifications to network design
	creates a software inventory
	tracks changes to the topology
	troubleshoots network problems
	tracks changes in protocol configurations
	implements new configurations
13. Which stage during a Cisco router bootup occurs last?
	POST
	find and load IOS
	find and load bootstrap
	find and load configuration
14. Which stage of the Cisco router bootup process verifies that all router components are operational?
	POST
	find IOS
	find bootstrap
	find configuration
15. Which Cisco router component is used primarily to store the startup-config file?
	RAM
	ROM
	NVRAM
	flash memory
	configuration register
16. Which of the following is a low-level operating system normally used for manufacturing testing and troubleshooting?
	POST
	bootstrap
	mini IOS
	ROMMON
17. During the Cisco router bootup process, what does the router do if the boot field value is 0x2?
	runs ROM Monitor
	loads IOS image from flash memory
	loads IOS image subset from ROM
	checks the startup-config file for boot system commands
18. What happens if the router cannot find a valid startup configuration file in NVRAM during router bootup?
	The router enters setup mode
	The router attempts to restart.
	The router runs ROM monitor
	The router performs a shutdown.
19. On most routers, the Cisco IOS software is loaded into _____ to run, but on some routers, it is run directly from _____.
	RAM, NVRAM
	RAM, flash memory
	Flash memory; RAM
	NVRAM, flash memory
20. The command show startup-config displays the configuration in what location?
	ROM
	RAM
	NVRAM
	flash memory
21. Which bits of the configuration register value make up the boot field?
	lowest octet
	highest octet
	lowest 4 bits
	highest 4 bits
22. Which Cisco IOS command is used to download a copy of the IOS image file from a TFTP server?
	copy IOS tftp
	copy tftp flash
	copy flash tftp
	backup flash tftp
23. Given the system image file c2600-js-mz.122-21a.bin, which part of the name indicates the platform?
	mz
	js
	122-21a
	c2600
24. Which Cisco IOS command displays the amount of memory that is available where the IOS image is stored on your router?
	show flash
	show nvram
	show memory
	show running-config
25. Where is the running configuration of the router usually stored?
	BIOS
	RAM
	NVRAM
	bootflash
26. Which Cisco IOS command merges a configuration file from NVRAM into the configuration in RAM?
	copy startup running
	copy running-config tftp
	copy startup-config RAM
	copy NVRAM running-config
27. What does the copy tftp startup command do?
	copies the configuration in NVRAM to a TFTP server
	downloads a configuration file from a TFTP file to RAM
	downloads a configuration file from a TFTP server to NVRAM
	merges the configuration in RAM with the configuration file on a TFTP server
28. When you copy a configuration from another source into RAM, what happens to the previous configuration?
	It is overwritten.
	It is retained in its current state.
	It is merged with the new configuration, with the existing configuration taking precedence.
	It is merged with the new configuration, with the new configuration taking precedence.
29. You should use debug commands to _____ problems, not to monitor normal network operation.
	test
	repair
	isolate
	duplicate
30. Why must you be careful when using debug commands?
	They are destructive.
	They open up security holes.
	They prevent normal traffic processing.
	They can have a negative impact on performance.
31. Which Cisco IOS command will add a time stamp to a debug or log message?
	timestamps debug
	debug timestamps
	service timestamps
	service debug timestamps
32. Which action can lead to software reload on a Cisco device?
	disabling a debug privileged EXEC command on a heavily used production router
	enabling a debug privileged EXEC command on a heavily used production router
	enabling a debug privileged EXEC command on a lightly used production router
	disabling a debug privileged EXEC command on a lightly used production router
33. Which Cisco IOS command will enable a Telnet session to receive console messages?
	terminal monitor
	terminal debug monitor
	terminal debug messages
	terminal console messages
34. It is best to use debug commands during periods of _____ network traffic and _____ users.
	lower, more
	lower, fewer
	higher, more
	higher, fewer
35. On a heavily used production router, enabling a debug privileged EXEC command can be _____.
	useful
	helpful
	harmful
	duplicate
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