Chapter 2: Configure a network operating system
What is the keystroke to abort the current process/break sequence?
ctrl + shift + 6
How many VTY lines do most cisco devices have? How are they numbered?
16, 0-15
What are the steps/commands to secure VTY lines? (3)
use the command "line vty 0 15" in global config mode, then enter "password" + your password then use "login" to enable access
Why are SVI's used and what are they used for?
you cannot assign an IP to a layer 2 switch. Used to enable remote access to a switch
What is the command to get context sensitive help?
"?"
What are the commands to create a banner message of the day? What mode must you be in?
"banner motd # your message #" from global configuration mode
What is the command to enter global config mode? What mode must you be in?
"configure terminal" from privileged EXEC mode
What is the command to save changes made to the running config to the starting config? What mode must you be in?
"copy running-configuration startup-configuration" in Privileged Exec
What is the command to put a password on privileged EXEC mode? What mode must you be in?
"enable secret" + your password in global config mode
What is the command to enter privileged EXEC mode? What mode must you be in?How do you go back to user EXEC mode?
"enable" from user exec mode. To go back to user exec mode enter "disable" from privileged EXEC mode
What command takes you from any configuration mode all the way back to privileged EXEC?What is the keystroke that will do this?
"end" or ctrl + z
How do you erase the startup config? Returning the device to how it came from the factory. What mode must you be in?
"erase startup-configuration" from privileged EXEC mode
What is the command to exit any sub configuration mode?
"exit"
What is the command to give a device a name?What mode must you be in?How do remove a device name?
"hostname" + the name in global configuration mode to remove the device name enter "no hostname" in global configuration mode
What is the command to enter interface configuration mode?What mode must you be in?
"interface vlan1" from global configuration mode
What are the commands to configure an IP address on an SVI?(3)What modes must you be in?
"interface vlan1" in global configuration mode, "ip address" + your ip and subnet mask, "no shutdown"
What is the command to display the IP configuration settings in windows?
"ipconfig"
What is the command to enter line console configuration mode?What mode must you be in?
"line console 0" from global configuration mode will let you configure the first console port.
What is the command to reboot the device and delete the current running config?What mode must you be in?
"reboot" from privileged EXEC mode
What is the command do encrypt passwords? What must you be in?
"service password-encryption" from global configuration mode
What command shows the switches interface IP schemes? what mode must you be in?What does this command show?
"show ip brief" from privileged EXEC mode. Shows the state (up or down), ip addresses of all ports (physical and SVI), and if the line protocol is up
What is the command to view the running config file? What mode must you be in?
"show running-configuration" from privileged EXEC mode
What is the command to view the startup config? What mode must you be in?
"show startup-configuration" in privileged EXEC mode
What is user EXEC mode?What other modes can you enter from this mode?(1)
A basic operations mode that allows some monitoring commands, cannot change the configuration of the device. You can enter privileged EXEC mode from here
What is Secure Shell (SSH)?What does it require?
A method for remotely accessing a secure CLI connect through a virtual interface (vlan). Requires an active interface with an IP address (vlan1)
What is privileged EXEC mode?What other modes can you enter from here?(1)
A mode that allows all commands and features. The user can use any monitoring, management, or configuration commands. You can enter global configuration mode from here
What is out of band access?
Access via a dedicated channel that is not on the network
What does square brackets around a variable mean? Ex: [X]
An optional keyword or argument
What does command syntax help do?
Checks if the command entered by the user is valid
What are the 3 most popular ways to connect to the CLI environment?
Console, Secure Shell, and Telnet
What is the startup-config and how is it stored?
Contains all of the command that will be used by the device upon startup or reboot. Stored in non volatile random access memory (NVRAM)
What must you consider when deciding what network media to use?(4)
Distance the media can carry a signal, environment in which the media will be installed, amount of data and speed that must be transmitted, and cost of media and installation.
What does DNS stand for and what is it used for?
Domain Name System. Used to translate IP address to web address (like cisco.com)
What is the structure of an IPv4 address called? how is represented?
Dotted Decimal Notation, represented by four decimal numbers between 0 and 255
What does DHCP stand for?
Dynamic Host Configuration Protocol
What do VTY lines do?
Enable remote access using telnet or SSH
How do you use a configuration in a text document to restore a configuration file to a device?
Enter global configuration mode,
What OS do network devices use?
Network Operating System
What are the steps to save a configuration file to a text document?
Open a terminal emulation, enable logging in the terminal software and assign a name and file location to save the log file. Execute a show running configuration command.
What other modes can you reach from global configuration mode?(2)
Other Specific sub modes like Line console config mode, interface config mode
What command is used to test connectivity between network devices or to the internet?
Ping
What things should you do when securing a network device device? (5)
Secure privileged EXEC access with a password, secure user EXEC access with a password, secure remote telnet access with a password, encrypt passwords, provide legal notice with banner MOTD
What are the guidelines for a good hostname? (4)
Start with a letter, end with a letter or digit, use only letters, digits, or dashes, and be less than 64 characters
What are the two system files that store device configuration?
Startup-config and running-config
What does the host name look like in Privileged EXEC mode?
Switch# or Router#
What does the host name look like in User EXEC mode?
Switch> or Router>
T/F Line con 0 lets you configure the first console port (often the only one)
T
T/F by default, windows firewall blocks ping requests
T
What is the network OS on cisco devices called?
The Cisco inter-network operating system
What is the default gateway?
The IP address of the router that the host will use to access remote networks
What portion of the OS interacts with the user?
The shell
What is interface configuration mode used for?What does the hostname look like?
Used to configure a switch port or router. The hostname is Switch(config-if)#
What is Line Console Configuration mode used for?What does the hostname look like?
Used to configure console, SSH, Telnet, and AUX access (VLAN1). The hostname is Switch(Config-Line)#
What information does a subnet mask give?
What particular subnet that device is a part of
What is a delimiting character?
a character entered before and after the banner motd, lets the computer know when it starts and stop. Can be any character not in the message.
What is Telnet? What does it require? What is its flaw?
a method for remotely accessing a CLI session through a virtual interface over a network. Requires an active virtual interface with an IP address (VLAN1). Its flaw is that it is not secure
Explain Console access
a physical port that provides out of band access to the network device
What does braces and vertical lines within a square bracket mean? Ex: [x {y | z}]
a required choice within an optional keyword or argument
What is a keyword?
a specific parameter defined in the OS
What does a network OS do?
enables a device hardware to function and provide users an interface to interact
What commands do you use to secure user EXEC mode? (2) What mode must you be in?
enter the command "password" + your password from line console configuration mode. Then enter the "login" command from line console configuration mode
What is an argument?
not predefined by the OS, a value or variable entered by the user
How do you configure a device for DHCP in windows?
open the control panel>Networking Sharing Center>Change Adapter Settings> and choose your adapter, then right click and select properties to display the Local Area Connection Properties, highlight Internet Protocol Version 4 (TCP/IPv4) properties and select obtain DNS server address automatically
How do you manually assign an IP address on windows?
open the control panel>Networking Sharing Center>Change Adapter Settings> and choose your adapter, then right click and select properties to display the Local Area Connection Properties, highlight Internet Protocol Version 4 (TCP/IPv4) properties. You can then enter the IP and subnet mask
What are some common Terminal Emulation Programs? (4)
puTTy, Tera Term, SecureCRT, and OS X terminal
What is the running-config and how is it stored?
the file that reflects the current configuration. Modifying this changes the operations of the device immediately. Store in random access memory (RAM)
What part of the OS directly interacts with the hardware?
the kernel
What does SVI stand for?
the switch virtual interface