Virtual Networking

Question 1

What is a Bridged network?

Answer 1

networking devices that create a single network from multiple communication networks.
ex: switch

Question 2

What is a NAT network?

Answer 2

connecting two networks together, and translating the private addresses, before packets are forwarded to another network
ex: router

Question 3

What is a Host-Only network?

Answer 3

a network that is completely contained within the host computer
ex: network connection between the virtual machine and the host computer

Question 4

A __________ __________ may be used in place of username/password credentials

Answer 4

Digital signature

Question 5

To access a server using SSH, two components are needed. They are

Answer 5

• remote server (sshd service must be running and offering services at port 22)
• should not be blocked by the firewall.

Question 6

In SSH, what is used to ensure that

you can be sure that you are connecting to the intended server.?

Answer 6

cryptography

Question 7

If you want to access Linux servers through SSH from a Windows computer, you need to install an SSH client like?

Answer 7

Putty

Question 8

How can you SSH between Linux machines in the command line?

1) type ssh followed by the IP address of the other Linux machine
2) type ssh followed by the name of the other Linux machine
3) type removeserver ssh followed by the name of the other Linux machine

Answer 8

In the command line type ssh followed by the ip address of the other Linux machine.

Question 9

What are two different ways to start an ssh session under a specific user?

Answer 9

• ssh Username@remoteserver

- ssh remoteserver -l username

Question 10

After connecting to the remote server, what is stored in the file ~/.ssh/known_hosts?

Answer 10

public key fingerprint

Question 11

What does it mean if the remote host key fingerprint does not match the key fingerprint that is stored locally?

Answer 11

Potentially dangerous situation.

Instead of being connected to the intended server, you might be connected to the server of an evildoer

Question 12

What are the two requirements for starting graphical

applications through an SSH connection?

Answer 12

■ An X server must be running on the client computer.
■ The remote host must be allowed to display screens on the local computer.
(The X server is the software component that creates the graphical screens.)

Question 13

The easiest way to allow the remote host to draw graphical screens on your computer is by?

Answer 13

adding the -X option to the ssh command.

ex use: ssh -X linda@server2

Question 14

What happens when you do the following: As root, open the configuration file /etc/ssh/ssh_config and make sure it includes the following line:
ForwardX11 yes

Answer 14

The next time you use the ssh command, X forwarding will be available by default to draw graphical screens

Question 15

You can use ____ to copy files and subdirectories to remote hosts, and subdirectories as well.

Answer 15

scp
ex: scp /etc/hosts server2:/tmp
or
scp -r server2:/etc/ /tmp

Question 16

When a public/private key-based authentication the public key is stored in?

Answer 16

the home directory of the target user on the SSH server.

Question 17

When a public/private key-based authentication the private key need to?

Answer 17

The private key needs to be kept private and will never be distributed

Question 18

When using public/private key-based authentication, the user who wants to connect to a server generates what?

Answer 18

a public/private key pair

Question 19

When authenticating using key pairs, the user generates a _______ derived from the
private key sent to the server. Server proves to match the public key that is stored on the server, the user is authenticated.

Answer 19

hash

Question 20

What command do you use to create a key pair?

Answer 20

ssh-keygen

Question 21

Before you can use screen, you need to install it. To do

this you need what use what command?

Answer 21

yum install -y screen
followed by
screen

Question 22

What does the screen -r command do?

Answer 22

gives a list of all currently available screen sessions

Question 23

What does the screen -ls command do?

Answer 23

shows you all screen sessions that are currently running

You can select the screen session you want to connect to by adding the number

Question 24

What does the screen -ls command do?

Answer 24

shows you all screen sessions that are currently running

You can select the screen session you want to connect to by adding the number

Question 25

What is needed to validate that a user is who he claims to be?

Answer 25

Authentication information

Question 26

_________ __________ is used to identify the user on a Linux system, such as username, home directory location, and so on?

Answer 26

Account information:

Question 27

Typically, the Lightweight Directory Access Protocol (LDAP) is used to provide the _________ ________.

Answer 27

account information

Question 28

Encrypted passwords for Authentication information is stored on an ______ ________ or can me managed using _______

Answer 28

an LDAP server or using Kerberos.

Question 29

Encrypted passwords for Authentication information is stored on an ______ ________ or can me managed using _______

Answer 29

an LDAP server or using Kerberos.

Question 30

Name an authentication protocol designed for secure network login without the need for users to reauthenticate when accessing new services.

Answer 30

Kerberos

Question 31

In Kerberos, tickets are issued by a central key server, which is known as the?

Answer 31

Key Distribution Center (KDC)

Question 32

What command is used to copy the public key over to the target server?

Answer 32

ssh-copy-id