NOS 120 Chapter 12
Upon running the ifconfig command, the IP address is listed along with the subnet mask in dotted decimal notation listed as 255.255.255.224. You have installed a remote access software that has an address field that requires the address to be configured in CIDR notation. Which of the following is the equivalent CIDR notation for the subnet mask listed?
/27
Which of the following files does the hostnamectl command modify to set the hostname on a machine?
/etc/hostname
Which file holds the methods to be used and the order in which they will be applied for host name resolution?
/etc/nsswitch.conf
You currently have a Linux system configured to check the /etc/hosts file before trying to contact a DNS server to resolve host names. You want to reverse the configuration so that it checks with a DNS server before falling back to the /etc/hosts file. Which of the following files should you modify to make this possible?
/etc/nsswitch.conf
Which file stores the IP addresses of the DNS servers used to resolve host names if no DNS servers are specified within the network configuration file for the network interface?
/etc/resolv.conf
What is the complete path and filename of the file where ports and their associated protocols are defined? ___________
/etc/services
Which file would you modify to permanently change the IP address of a network interface on a Fedora 28 system?
/etc/sysconfig/network-scripts/ifcfg-enp8s0
Which of the following is a valid APIPA address?
169.254.38.101
· Which of the following port numbers is associated with SSH?
22
The output of the ifconfig shows a HWaddr expressed in hexadecimal. How many bits is the hardware address shown made up of?
48
Which of the following ports would be used to resolve a domain name to an IP address?
53
Which of the following are stand-alone daemons? (Choose all that apply.)
Apache(httpd) DNS (named)
What are two means available to resolve a host name to the appropriate IP address? (Choose two answers.)
DNS /etc/hosts
Standalone daemons are started on demand using xinetd. True or False?
False
The NetworkManager or Systemd-networkd components must be installed on a Linux system in order to configure an IP address on a network interface. True or False?
False
Which Windows program is often used to connect to a Linux server via SSH?
Putty
What is the most commonly used LAN protocol?
TCP/IP
SSH encrypts all traffic that passes across the network, whereas telnet does not. True or False?
True
· The line that configures the host name for the computer at boot time can be found in /etc/hostname. True or False?
True
You have set up a TFTP server to support PXE booting of several workstations. Which of the following protocols would this setup make use of?
UDP
Which of the following can be used to graphically remotely administer a Linux machine?
VNC
Which of the following types of technologies will create a tunneled encrypted connection from a remote location into a corporate network to be able to access resources as if the user was physically connected to the LAN?
VPN
· Before a computer can use a router, what configuration information must it be provided?
default gateway
Which of the following are valid statements in the /etc/resolv.conf file? (Choose two.)
domain comptia.org 10.1.15.60 server10
Which of the following commands will display detailed information for network hardware?
ethtool
Which of the following is the keyword that should be listed after the hosts statement in the /etc/nsswitch.conf file so that the system will consult the /etc/hosts file to resolve a name to an IP address?
files
Which of the following will display entries from the Name Service Switch libraries?
getent
You run the command hostname server1 and issue the reboot command. You notice that the host name has reverted back to what it was before the reboot. Which of the following commands should you have used to change the host name instead?
hostnamectl set-hostname server1
Which of the following utilities can be used to check TCP/IP configuration and test network connectivity? (Choose all that apply.)
ifconfig iwconfig ping nmcli
The system administrator has shut ethernet interface eth0 down while making some changes to the system. Which of the following commands can they use to bring the network connection back up?
ifup eth0
When connecting to a host via SSH for the first time, the user is prompted to accept the encryption fingerprint for the target computer which is stored in ___________ in the ~/.ssh/ directory.
known_hosts
· The IP address of 127.0.0.1 is also referred to as the _____.
loopback adress
· Which commands can be used to display TCP/IP connections on your Linux system?
mtr
Which of the following commands will show active UDP connections on a Linux system? (Choose all that apply.)
netstat --udp netstat -u
On a system running NetworkManager, which of the following commands can be used to view or modify connection information?
nmcli
Which of the following commands will send 4 ICMP echo requests to a remote host named server1 to determine the round trip time it takes a packet to travel?
ping -c 4 server1
· The daemons associated with network services listen for network traffic associated with a particular _____.
port
Which two commands can be used to modify the route table on a Linux computer? (Choose two answers.)
route traceroute
Which of the following commands can be used to display socket information out to the terminal screen?
ss
· You want to generate SSH keys for your user account and copy them to a remote computer to simplify future SSH authentication. What two commands can you use to perform these actions? (Choose two answers.)
ssh-copy-id ssh-keygen
· Which of the following can be used to provide graphical remote administration? (Choose all that apply.)
ssh-x VNC
Which of the following commands can be used to trace an IPv6 route? (Choose two.)
traceroute6 tracepath6
To test DNS configuration by resolving a host name to an IP address, which command or commands can you use? (Choose all that apply.)
· nslookup hostname · dig hostname · host hostname
